drivers/gpu/drm/i915/intel_display.c

/*
 * Copyright © 2006-2007 Intel Corporation
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 *
 * Authors:
 *	Eric Anholt <eric@anholt.net>
 */

#include <linux/dmi.h>
#include <linux/module.h>
#include <linux/input.h>
#include <linux/i2c.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/vgaarb.h>
#include <drm/drm_edid.h>
#include <drm/drmP.h>
#include "intel_drv.h"
#include <drm/i915_drm.h>
#include "i915_drv.h"
#include "i915_trace.h"
#include <drm/drm_dp_helper.h>
#include <drm/drm_crtc_helper.h>
#include <linux/dma_remapping.h>

bool intel_pipe_has_type(struct drm_crtc *crtc, int type);
static void intel_increase_pllclock(struct drm_crtc *crtc);
static void intel_crtc_update_cursor(struct drm_crtc *crtc, bool on);

typedef struct {
	/* given values */
	int n;
	int m1, m2;
	int p1, p2;
	/* derived values */
	int	dot;
	int	vco;
	int	m;
	int	p;
} intel_clock_t;

typedef struct {
	int	min, max;
} intel_range_t;

typedef struct {
	int	dot_limit;
	int	p2_slow, p2_fast;
} intel_p2_t;

#define INTEL_P2_NUM		      2
typedef struct intel_limit intel_limit_t;
struct intel_limit {
	intel_range_t   dot, vco, n, m, m1, m2, p, p1;
	intel_p2_t	    p2;
	bool (* find_pll)(const intel_limit_t *, struct drm_crtc *,
			int, int, intel_clock_t *, intel_clock_t *);
};

/* FDI */
#define IRONLAKE_FDI_FREQ		2700000 /* in kHz for mode->clock */

int
intel_pch_rawclk(struct drm_device *dev)
{
	struct drm_i915_private *dev_priv = dev->dev_private;

	WARN_ON(!HAS_PCH_SPLIT(dev));

	return I915_READ(PCH_RAWCLK_FREQ) & RAWCLK_FREQ_MASK;
}

static bool
intel_find_best_PLL(const intel_limit_t *limit, struct drm_crtc *crtc,
		    int target, int refclk, intel_clock_t *match_clock,
		    intel_clock_t *best_clock);
static bool
intel_g4x_find_best_PLL(const intel_limit_t *limit, struct drm_crtc *crtc,
			int target, int refclk, intel_clock_t *match_clock,
			intel_clock_t *best_clock);

static bool
intel_find_pll_g4x_dp(const intel_limit_t *, struct drm_crtc *crtc,
		      int target, int refclk, intel_clock_t *match_clock,
		      intel_clock_t *best_clock);
static bool
intel_find_pll_ironlake_dp(const intel_limit_t *, struct drm_crtc *crtc,
			   int target, int refclk, intel_clock_t *match_clock,
			   intel_clock_t *best_clock);

static bool
intel_vlv_find_best_pll(const intel_limit_t *limit, struct drm_crtc *crtc,
			int target, int refclk, intel_clock_t *match_clock,
			intel_clock_t *best_clock);

static inline u32 /* units of 100MHz */
intel_fdi_link_freq(struct drm_device *dev)
{
	if (IS_GEN5(dev)) {
		struct drm_i915_private *dev_priv = dev->dev_private;
		return (I915_READ(FDI_PLL_BIOS_0) & FDI_PLL_FB_CLOCK_MASK) + 2;
	} else
		return 27;
}

static const intel_limit_t intel_limits_i8xx_dvo = {
	.dot = { .min = 25000, .max = 350000 },
	.vco = { .min = 930000, .max = 1400000 },
	.n = { .min = 3, .max = 16 },
	.m = { .min = 96, .max = 140 },
	.m1 = { .min = 18, .max = 26 },
	.m2 = { .min = 6, .max = 16 },
	.p = { .min = 4, .max = 128 },
	.p1 = { .min = 2, .max = 33 },
	.p2 = { .dot_limit = 165000,
		.p2_slow = 4, .p2_fast = 2 },
	.find_pll = intel_find_best_PLL,
};

static const intel_limit_t intel_limits_i8xx_lvds = {
	.dot = { .min = 25000, .max = 350000 },
	.vco = { .min = 930000, .max = 1400000 },
	.n = { .min = 3, .max = 16 },
	.m = { .min = 96, .max = 140 },
	.m1 = { .min = 18, .max = 26 },
	.m2 = { .min = 6, .max = 16 },
	.p = { .min = 4, .max = 128 },
	.p1 = { .min = 1, .max = 6 },
	.p2 = { .dot_limit = 165000,
		.p2_slow = 14, .p2_fast = 7 },
	.find_pll = intel_find_best_PLL,
};

static const intel_limit_t intel_limits_i9xx_sdvo = {
	.dot = { .min = 20000, .max = 400000 },
	.vco = { .min = 1400000, .max = 2800000 },
	.n = { .min = 1, .max = 6 },
	.m = { .min = 70, .max = 120 },
	.m1 = { .min = 8, .max = 18 },
	.m2 = { .min = 3, .max = 7 },
	.p = { .min = 5, .max = 80 },
	.p1 = { .min = 1, .max = 8 },
	.p2 = { .dot_limit = 200000,
		.p2_slow = 10, .p2_fast = 5 },
	.find_pll = intel_find_best_PLL,
};

static const intel_limit_t intel_limits_i9xx_lvds = {
	.dot = { .min = 20000, .max = 400000 },
	.vco = { .min = 1400000, .max = 2800000 },
	.n = { .min = 1, .max = 6 },
	.m = { .min = 70, .max = 120 },
	.m1 = { .min = 8, .max = 18 },
	.m2 = { .min = 3, .max = 7 },
	.p = { .min = 7, .max = 98 },
	.p1 = { .min = 1, .max = 8 },
	.p2 = { .dot_limit = 112000,
		.p2_slow = 14, .p2_fast = 7 },
	.find_pll = intel_find_best_PLL,
};


static const intel_limit_t intel_limits_g4x_sdvo = {
	.dot = { .min = 25000, .max = 270000 },
	.vco = { .min = 1750000, .max = 3500000},
	.n = { .min = 1, .max = 4 },
	.m = { .min = 104, .max = 138 },
	.m1 = { .min = 17, .max = 23 },
	.m2 = { .min = 5, .max = 11 },
	.p = { .min = 10, .max = 30 },
	.p1 = { .min = 1, .max = 3},
	.p2 = { .dot_limit = 270000,
		.p2_slow = 10,
		.p2_fast = 10
	},
	.find_pll = intel_g4x_find_best_PLL,
};

static const intel_limit_t intel_limits_g4x_hdmi = {
	.dot = { .min = 22000, .max = 400000 },
	.vco = { .min = 1750000, .max = 3500000},
	.n = { .min = 1, .max = 4 },
	.m = { .min = 104, .max = 138 },
	.m1 = { .min = 16, .max = 23 },
	.m2 = { .min = 5, .max = 11 },
	.p = { .min = 5, .max = 80 },
	.p1 = { .min = 1, .max = 8},
	.p2 = { .dot_limit = 165000,
		.p2_slow = 10, .p2_fast = 5 },
	.find_pll = intel_g4x_find_best_PLL,
};

static const intel_limit_t intel_limits_g4x_single_channel_lvds = {
	.dot = { .min = 20000, .max = 115000 },
	.vco = { .min = 1750000, .max = 3500000 },
	.n = { .min = 1, .max = 3 },
	.m = { .min = 104, .max = 138 },
	.m1 = { .min = 17, .max = 23 },
	.m2 = { .min = 5, .max = 11 },
	.p = { .min = 28, .max = 112 },
	.p1 = { .min = 2, .max = 8 },
	.p2 = { .dot_limit = 0,
		.p2_slow = 14, .p2_fast = 14
	},
	.find_pll = intel_g4x_find_best_PLL,
};

static const intel_limit_t intel_limits_g4x_dual_channel_lvds = {
	.dot = { .min = 80000, .max = 224000 },
	.vco = { .min = 1750000, .max = 3500000 },
	.n = { .min = 1, .max = 3 },
	.m = { .min = 104, .max = 138 },
	.m1 = { .min = 17, .max = 23 },
	.m2 = { .min = 5, .max = 11 },
	.p = { .min = 14, .max = 42 },
	.p1 = { .min = 2, .max = 6 },
	.p2 = { .dot_limit = 0,
		.p2_slow = 7, .p2_fast = 7
	},
	.find_pll = intel_g4x_find_best_PLL,
};

static const intel_limit_t intel_limits_g4x_display_port = {
	.dot = { .min = 161670, .max = 227000 },
	.vco = { .min = 1750000, .max = 3500000},
	.n = { .min = 1, .max = 2 },
	.m = { .min = 97, .max = 108 },
	.m1 = { .min = 0x10, .max = 0x12 },
	.m2 = { .min = 0x05, .max = 0x06 },
	.p = { .min = 10, .max = 20 },
	.p1 = { .min = 1, .max = 2},
	.p2 = { .dot_limit = 0,
		.p2_slow = 10, .p2_fast = 10 },
	.find_pll = intel_find_pll_g4x_dp,
};

static const intel_limit_t intel_limits_pineview_sdvo = {
	.dot = { .min = 20000, .max = 400000},
	.vco = { .min = 1700000, .max = 3500000 },
	/* Pineview's Ncounter is a ring counter */
	.n = { .min = 3, .max = 6 },
	.m = { .min = 2, .max = 256 },
	/* Pineview only has one combined m divider, which we treat as m2. */
	.m1 = { .min = 0, .max = 0 },
	.m2 = { .min = 0, .max = 254 },
	.p = { .min = 5, .max = 80 },
	.p1 = { .min = 1, .max = 8 },
	.p2 = { .dot_limit = 200000,
		.p2_slow = 10, .p2_fast = 5 },
	.find_pll = intel_find_best_PLL,
};

static const intel_limit_t intel_limits_pineview_lvds = {
	.dot = { .min = 20000, .max = 400000 },
	.vco = { .min = 1700000, .max = 3500000 },
	.n = { .min = 3, .max = 6 },
	.m = { .min = 2, .max = 256 },
	.m1 = { .min = 0, .max = 0 },
	.m2 = { .min = 0, .max = 254 },
	.p = { .min = 7, .max = 112 },
	.p1 = { .min = 1, .max = 8 },
	.p2 = { .dot_limit = 112000,
		.p2_slow = 14, .p2_fast = 14 },
	.find_pll = intel_find_best_PLL,
};

/* Ironlake / Sandybridge
 *
 * We calculate clock using (register_value + 2) for N/M1/M2, so here
 * the range value for them is (actual_value - 2).
 */
static const intel_limit_t intel_limits_ironlake_dac = {
	.dot = { .min = 25000, .max = 350000 },
	.vco = { .min = 1760000, .max = 3510000 },
	.n = { .min = 1, .max = 5 },
	.m = { .min = 79, .max = 127 },
	.m1 = { .min = 12, .max = 22 },
	.m2 = { .min = 5, .max = 9 },
	.p = { .min = 5, .max = 80 },
	.p1 = { .min = 1, .max = 8 },
	.p2 = { .dot_limit = 225000,
		.p2_slow = 10, .p2_fast = 5 },
	.find_pll = intel_g4x_find_best_PLL,
};

static const intel_limit_t intel_limits_ironlake_single_lvds = {
	.dot = { .min = 25000, .max = 350000 },
	.vco = { .min = 1760000, .max = 3510000 },
	.n = { .min = 1, .max = 3 },
	.m = { .min = 79, .max = 118 },
	.m1 = { .min = 12, .max = 22 },
	.m2 = { .min = 5, .max = 9 },
	.p = { .min = 28, .max = 112 },
	.p1 = { .min = 2, .max = 8 },
	.p2 = { .dot_limit = 225000,
		.p2_slow = 14, .p2_fast = 14 },
	.find_pll = intel_g4x_find_best_PLL,
};

static const intel_limit_t intel_limits_ironlake_dual_lvds = {
	.dot = { .min = 25000, .max = 350000 },
	.vco = { .min = 1760000, .max = 3510000 },
	.n = { .min = 1, .max = 3 },
	.m = { .min = 79, .max = 127 },
	.m1 = { .min = 12, .max = 22 },
	.m2 = { .min = 5, .max = 9 },
	.p = { .min = 14, .max = 56 },
	.p1 = { .min = 2, .max = 8 },
	.p2 = { .dot_limit = 225000,
		.p2_slow = 7, .p2_fast = 7 },
	.find_pll = intel_g4x_find_best_PLL,
};

/* LVDS 100mhz refclk limits. */
static const intel_limit_t intel_limits_ironlake_single_lvds_100m = {
	.dot = { .min = 25000, .max = 350000 },
	.vco = { .min = 1760000, .max = 3510000 },
	.n = { .min = 1, .max = 2 },
	.m = { .min = 79, .max = 126 },
	.m1 = { .min = 12, .max = 22 },
	.m2 = { .min = 5, .max = 9 },
	.p = { .min = 28, .max = 112 },
	.p1 = { .min = 2, .max = 8 },
	.p2 = { .dot_limit = 225000,
		.p2_slow = 14, .p2_fast = 14 },
	.find_pll = intel_g4x_find_best_PLL,
};

static const intel_limit_t intel_limits_ironlake_dual_lvds_100m = {
	.dot = { .min = 25000, .max = 350000 },
	.vco = { .min = 1760000, .max = 3510000 },
	.n = { .min = 1, .max = 3 },
	.m = { .min = 79, .max = 126 },
	.m1 = { .min = 12, .max = 22 },
	.m2 = { .min = 5, .max = 9 },
	.p = { .min = 14, .max = 42 },
	.p1 = { .min = 2, .max = 6 },
	.p2 = { .dot_limit = 225000,
		.p2_slow = 7, .p2_fast = 7 },
	.find_pll = intel_g4x_find_best_PLL,
};

static const intel_limit_t intel_limits_ironlake_display_port = {
	.dot = { .min = 25000, .max = 350000 },
	.vco = { .min = 1760000, .max = 3510000},
	.n = { .min = 1, .max = 2 },
	.m = { .min = 81, .max = 90 },
	.m1 = { .min = 12, .max = 22 },
	.m2 = { .min = 5, .max = 9 },
	.p = { .min = 10, .max = 20 },
	.p1 = { .min = 1, .max = 2},
	.p2 = { .dot_limit = 0,
		.p2_slow = 10, .p2_fast = 10 },
	.find_pll = intel_find_pll_ironlake_dp,
};

static const intel_limit_t intel_limits_vlv_dac = {
	.dot = { .min = 25000, .max = 270000 },
	.vco = { .min = 4000000, .max = 6000000 },
	.n = { .min = 1, .max = 7 },
	.m = { .min = 22, .max = 450 }, /* guess */
	.m1 = { .min = 2, .max = 3 },
	.m2 = { .min = 11, .max = 156 },
	.p = { .min = 10, .max = 30 },
	.p1 = { .min = 2, .max = 3 },
	.p2 = { .dot_limit = 270000,
		.p2_slow = 2, .p2_fast = 20 },
	.find_pll = intel_vlv_find_best_pll,
};

static const intel_limit_t intel_limits_vlv_hdmi = {
	.dot = { .min = 20000, .max = 165000 },
	.vco = { .min = 4000000, .max = 5994000},
	.n = { .min = 1, .max = 7 },
	.m = { .min = 60, .max = 300 }, /* guess */
	.m1 = { .min = 2, .max = 3 },
	.m2 = { .min = 11, .max = 156 },
	.p = { .min = 10, .max = 30 },
	.p1 = { .min = 2, .max = 3 },
	.p2 = { .dot_limit = 270000,
		.p2_slow = 2, .p2_fast = 20 },
	.find_pll = intel_vlv_find_best_pll,
};

static const intel_limit_t intel_limits_vlv_dp = {
	.dot = { .min = 25000, .max = 270000 },
	.vco = { .min = 4000000, .max = 6000000 },
	.n = { .min = 1, .max = 7 },
	.m = { .min = 22, .max = 450 },
	.m1 = { .min = 2, .max = 3 },
	.m2 = { .min = 11, .max = 156 },
	.p = { .min = 10, .max = 30 },
	.p1 = { .min = 2, .max = 3 },
	.p2 = { .dot_limit = 270000,
		.p2_slow = 2, .p2_fast = 20 },
	.find_pll = intel_vlv_find_best_pll,
};

u32 intel_dpio_read(struct drm_i915_private *dev_priv, int reg)
{
	WARN_ON(!mutex_is_locked(&dev_priv->dpio_lock));

	if (wait_for_atomic_us((I915_READ(DPIO_PKT) & DPIO_BUSY) == 0, 100)) {
		DRM_ERROR("DPIO idle wait timed out\n");
		return 0;
	}

	I915_WRITE(DPIO_REG, reg);
	I915_WRITE(DPIO_PKT, DPIO_RID | DPIO_OP_READ | DPIO_PORTID |
		   DPIO_BYTE);
	if (wait_for_atomic_us((I915_READ(DPIO_PKT) & DPIO_BUSY) == 0, 100)) {
		DRM_ERROR("DPIO read wait timed out\n");
		return 0;
	}

	return I915_READ(DPIO_DATA);
}

static void intel_dpio_write(struct drm_i915_private *dev_priv, int reg,
			     u32 val)
{
	WARN_ON(!mutex_is_locked(&dev_priv->dpio_lock));

	if (wait_for_atomic_us((I915_READ(DPIO_PKT) & DPIO_BUSY) == 0, 100)) {
		DRM_ERROR("DPIO idle wait timed out\n");
		return;
	}

	I915_WRITE(DPIO_DATA, val);
	I915_WRITE(DPIO_REG, reg);
	I915_WRITE(DPIO_PKT, DPIO_RID | DPIO_OP_WRITE | DPIO_PORTID |
		   DPIO_BYTE);
	if (wait_for_atomic_us((I915_READ(DPIO_PKT) & DPIO_BUSY) == 0, 100))
		DRM_ERROR("DPIO write wait timed out\n");
}

static void vlv_init_dpio(struct drm_device *dev)
{
	struct drm_i915_private *dev_priv = dev->dev_private;

	/* Reset the DPIO config */
	I915_WRITE(DPIO_CTL, 0);
	POSTING_READ(DPIO_CTL);
	I915_WRITE(DPIO_CTL, 1);
	POSTING_READ(DPIO_CTL);
}

static const intel_limit_t *intel_ironlake_limit(struct drm_crtc *crtc,
						int refclk)
{
	struct drm_device *dev = crtc->dev;
	const intel_limit_t *limit;

	if (intel_pipe_has_type(crtc, INTEL_OUTPUT_LVDS)) {
		if (intel_is_dual_link_lvds(dev)) {
			/* LVDS dual channel */
			if (refclk == 100000)
				limit = &intel_limits_ironlake_dual_lvds_100m;
			else
				limit = &intel_limits_ironlake_dual_lvds;
		} else {
			if (refclk == 100000)
				limit = &intel_limits_ironlake_single_lvds_100m;
			else
				limit = &intel_limits_ironlake_single_lvds;
		}
	} else if (intel_pipe_has_type(crtc, INTEL_OUTPUT_DISPLAYPORT) ||
		   intel_pipe_has_type(crtc, INTEL_OUTPUT_EDP))
		limit = &intel_limits_ironlake_display_port;
	else
		limit = &intel_limits_ironlake_dac;

	return limit;
}

static const intel_limit_t *intel_g4x_limit(struct drm_crtc *crtc)
{
	struct drm_device *dev = crtc->dev;
	const intel_limit_t *limit;

	if (intel_pipe_has_type(crtc, INTEL_OUTPUT_LVDS)) {
		if (intel_is_dual_link_lvds(dev))
			/* LVDS with dual channel */
			limit = &intel_limits_g4x_dual_channel_lvds;
		else
			/* LVDS with dual channel */
			limit = &intel_limits_g4x_single_channel_lvds;
	} else if (intel_pipe_has_type(crtc, INTEL_OUTPUT_HDMI) ||
		   intel_pipe_has_type(crtc, INTEL_OUTPUT_ANALOG)) {
		limit = &intel_limits_g4x_hdmi;
	} else if (intel_pipe_has_type(crtc, INTEL_OUTPUT_SDVO)) {
		limit = &intel_limits_g4x_sdvo;
	} else if (intel_pipe_has_type(crtc, INTEL_OUTPUT_DISPLAYPORT)) {
		limit = &intel_limits_g4x_display_port;
	} else /* The option is for other outputs */
		limit = &intel_limits_i9xx_sdvo;

	return limit;
}

static const intel_limit_t *intel_limit(struct drm_crtc *crtc, int refclk)
{
	struct drm_device *dev = crtc->dev;
	const intel_limit_t *limit;

	if (HAS_PCH_SPLIT(dev))
		limit = intel_ironlake_limit(crtc, refclk);
	else if (IS_G4X(dev)) {
		limit = intel_g4x_limit(crtc);
	} else if (IS_PINEVIEW(dev)) {
		if (intel_pipe_has_type(crtc, INTEL_OUTPUT_LVDS))
			limit = &intel_limits_pineview_lvds;
		else
			limit = &intel_limits_pineview_sdvo;
	} else if (IS_VALLEYVIEW(dev)) {
		if (intel_pipe_has_type(crtc, INTEL_OUTPUT_ANALOG))
			limit = &intel_limits_vlv_dac;
		else if (intel_pipe_has_type(crtc, INTEL_OUTPUT_HDMI))
			limit = &intel_limits_vlv_hdmi;
		else
			limit = &intel_limits_vlv_dp;
	} else if (!IS_GEN2(dev)) {
		if (intel_pipe_has_type(crtc, INTEL_OUTPUT_LVDS))
			limit = &intel_limits_i9xx_lvds;
		else
			limit = &intel_limits_i9xx_sdvo;
	} else {
		if (intel_pipe_has_type(crtc, INTEL_OUTPUT_LVDS))
			limit = &intel_limits_i8xx_lvds;
		else
			limit = &intel_limits_i8xx_dvo;
	}
	return limit;
}

/* m1 is reserved as 0 in Pineview, n is a ring counter */
static void pineview_clock(int refclk, intel_clock_t *clock)
{
	clock->m = clock->m2 + 2;
	clock->p = clock->p1 * clock->p2;
	clock->vco = refclk * clock->m / clock->n;
	clock->dot = clock->vco / clock->p;
}

static void intel_clock(struct drm_device *dev, int refclk, intel_clock_t *clock)
{
	if (IS_PINEVIEW(dev)) {
		pineview_clock(refclk, clock);
		return;
	}
	clock->m = 5 * (clock->m1 + 2) + (clock->m2 + 2);
	clock->p = clock->p1 * clock->p2;
	clock->vco = refclk * clock->m / (clock->n + 2);
	clock->dot = clock->vco / clock->p;
}

/**
 * Returns whether any output on the specified pipe is of the specified type
 */
bool intel_pipe_has_type(struct drm_crtc *crtc, int type)
{
	struct drm_device *dev = crtc->dev;
	struct intel_encoder *encoder;

	for_each_encoder_on_crtc(dev, crtc, encoder)
		if (encoder->type == type)
			return true;

	return false;
}

#define INTELPllInvalid(s)   do { /* DRM_DEBUG(s); */ return false; } while (0)
/**
 * Returns whether the given set of divisors are valid for a given refclk with
 * the given connectors.
 */

static bool intel_PLL_is_valid(struct drm_device *dev,
			       const intel_limit_t *limit,
			       const intel_clock_t *clock)
{
	if (clock->p1  < limit->p1.min  || limit->p1.max  < clock->p1)
		INTELPllInvalid("p1 out of range\n");
	if (clock->p   < limit->p.min   || limit->p.max   < clock->p)
		INTELPllInvalid("p out of range\n");
	if (clock->m2  < limit->m2.min  || limit->m2.max  < clock->m2)
		INTELPllInvalid("m2 out of range\n");
	if (clock->m1  < limit->m1.min  || limit->m1.max  < clock->m1)
		INTELPllInvalid("m1 out of range\n");
	if (clock->m1 <= clock->m2 && !IS_PINEVIEW(dev))
		INTELPllInvalid("m1 <= m2\n");
	if (clock->m   < limit->m.min   || limit->m.max   < clock->m)
		INTELPllInvalid("m out of range\n");
	if (clock->n   < limit->n.min   || limit->n.max   < clock->n)
		INTELPllInvalid("n out of range\n");
	if (clock->vco < limit->vco.min || limit->vco.max < clock->vco)
		INTELPllInvalid("vco out of range\n");
	/* XXX: We may need to be checking "Dot clock" depending on the multiplier,
	 * connector, etc., rather than just a single range.
	 */
	if (clock->dot < limit->dot.min || limit->dot.max < clock->dot)
		INTELPllInvalid("dot out of range\n");

	return true;
}

static bool
intel_find_best_PLL(const intel_limit_t *limit, struct drm_crtc *crtc,
		    int target, int refclk, intel_clock_t *match_clock,
		    intel_clock_t *best_clock)

{
	struct drm_device *dev = crtc->dev;
	intel_clock_t clock;
	int err = target;

	if (intel_pipe_has_type(crtc, INTEL_OUTPUT_LVDS)) {
		/*
		 * For LVDS just rely on its current settings for dual-channel.
		 * We haven't figured out how to reliably set up different
		 * single/dual channel state, if we even can.
		 */
		if (intel_is_dual_link_lvds(dev))
			clock.p2 = limit->p2.p2_fast;
		else
			clock.p2 = limit->p2.p2_slow;
	} else {
		if (target < limit->p2.dot_limit)
			clock.p2 = limit->p2.p2_slow;
		else
			clock.p2 = limit->p2.p2_fast;
	}

	memset(best_clock, 0, sizeof(*best_clock));

	for (clock.m1 = limit->m1.min; clock.m1 <= limit->m1.max;
	     clock.m1++) {
		for (clock.m2 = limit->m2.min;
		     clock.m2 <= limit->m2.max; clock.m2++) {
			/* m1 is always 0 in Pineview */
			if (clock.m2 >= clock.m1 && !IS_PINEVIEW(dev))
				break;
			for (clock.n = limit->n.min;
			     clock.n <= limit->n.max; clock.n++) {
				for (clock.p1 = limit->p1.min;
					clock.p1 <= limit->p1.max; clock.p1++) {
					int this_err;

					intel_clock(dev, refclk, &clock);
					if (!intel_PLL_is_valid(dev, limit,
								&clock))
						continue;
					if (match_clock &&
					    clock.p != match_clock->p)
						continue;

					this_err = abs(clock.dot - target);
					if (this_err < err) {
						*best_clock = clock;
						err = this_err;
					}
				}
			}
		}
	}

	return (err != target);
}

static bool
intel_g4x_find_best_PLL(const intel_limit_t *limit, struct drm_crtc *crtc,
			int target, int refclk, intel_clock_t *match_clock,
			intel_clock_t *best_clock)
{
	struct drm_device *dev = crtc->dev;
	intel_clock_t clock;
	int max_n;
	bool found;
	/* approximately equals target * 0.00585 */
	int err_most = (target >> 8) + (target >> 9);
	found = false;

	if (intel_pipe_has_type(crtc, INTEL_OUTPUT_LVDS)) {
		int lvds_reg;

		if (HAS_PCH_SPLIT(dev))
			lvds_reg = PCH_LVDS;
		else
			lvds_reg = LVDS;
		if (intel_is_dual_link_lvds(dev))
			clock.p2 = limit->p2.p2_fast;
		else
			clock.p2 = limit->p2.p2_slow;
	} else {
		if (target < limit->p2.dot_limit)
			clock.p2 = limit->p2.p2_slow;
		else
			clock.p2 = limit->p2.p2_fast;
	}

	memset(best_clock, 0, sizeof(*best_clock));
	max_n = limit->n.max;
	/* based on hardware requirement, prefer smaller n to precision */
	for (clock.n = limit->n.min; clock.n <= max_n; clock.n++) {
		/* based on hardware requirement, prefere larger m1,m2 */
		for (clock.m1 = limit->m1.max;
		     clock.m1 >= limit->m1.min; clock.m1--) {
			for (clock.m2 = limit->m2.max;
			     clock.m2 >= limit->m2.min; clock.m2--) {
				for (clock.p1 = limit->p1.max;
				     clock.p1 >= limit->p1.min; clock.p1--) {
					int this_err;

					intel_clock(dev, refclk, &clock);
					if (!intel_PLL_is_valid(dev, limit,
								&clock))
						continue;
					if (match_clock &&
					    clock.p != match_clock->p)
						continue;

					this_err = abs(clock.dot - target);
					if (this_err < err_most) {
						*best_clock = clock;
						err_most = this_err;
						max_n = clock.n;
						found = true;
					}
				}
			}
		}
	}
	return found;
}

static bool
intel_find_pll_ironlake_dp(const intel_limit_t *limit, struct drm_crtc *crtc,
			   int target, int refclk, intel_clock_t *match_clock,
			   intel_clock_t *best_clock)
{
	struct drm_device *dev = crtc->dev;
	intel_clock_t clock;

	if (target < 200000) {
		clock.n = 1;
		clock.p1 = 2;
		clock.p2 = 10;
		clock.m1 = 12;
		clock.m2 = 9;
	} else {
		clock.n = 2;
		clock.p1 = 1;
		clock.p2 = 10;
		clock.m1 = 14;
		clock.m2 = 8;
	}
	intel_clock(dev, refclk, &clock);
	memcpy(best_clock, &clock, sizeof(intel_clock_t));
	return true;
}

/* DisplayPort has only two frequencies, 162MHz and 270MHz */
static bool
intel_find_pll_g4x_dp(const intel_limit_t *limit, struct drm_crtc *crtc,
		      int target, int refclk, intel_clock_t *match_clock,
		      intel_clock_t *best_clock)
{
	intel_clock_t clock;
	if (target < 200000) {
		clock.p1 = 2;
		clock.p2 = 10;
		clock.n = 2;
		clock.m1 = 23;
		clock.m2 = 8;
	} else {
		clock.p1 = 1;
		clock.p2 = 10;
		clock.n = 1;
		clock.m1 = 14;
		clock.m2 = 2;
	}
	clock.m = 5 * (clock.m1 + 2) + (clock.m2 + 2);
	clock.p = (clock.p1 * clock.p2);
	clock.dot = 96000 * clock.m / (clock.n + 2) / clock.p;
	clock.vco = 0;
	memcpy(best_clock, &clock, sizeof(intel_clock_t));
	return true;
}
static bool
intel_vlv_find_best_pll(const intel_limit_t *limit, struct drm_crtc *crtc,
			int target, int refclk, intel_clock_t *match_clock,
			intel_clock_t *best_clock)
{
	u32 p1, p2, m1, m2, vco, bestn, bestm1, bestm2, bestp1, bestp2;
	u32 m, n, fastclk;
	u32 updrate, minupdate, fracbits, p;
	unsigned long bestppm, ppm, absppm;
	int dotclk, flag;

	flag = 0;
	dotclk = target * 1000;
	bestppm = 1000000;
	ppm = absppm = 0;
	fastclk = dotclk / (2*100);
	updrate = 0;
	minupdate = 19200;
	fracbits = 1;
	n = p = p1 = p2 = m = m1 = m2 = vco = bestn = 0;
	bestm1 = bestm2 = bestp1 = bestp2 = 0;

	/* based on hardware requirement, prefer smaller n to precision */
	for (n = limit->n.min; n <= ((refclk) / minupdate); n++) {
		updrate = refclk / n;
		for (p1 = limit->p1.max; p1 > limit->p1.min; p1--) {
			for (p2 = limit->p2.p2_fast+1; p2 > 0; p2--) {
				if (p2 > 10)
					p2 = p2 - 1;
				p = p1 * p2;
				/* based on hardware requirement, prefer bigger m1,m2 values */
				for (m1 = limit->m1.min; m1 <= limit->m1.max; m1++) {
					m2 = (((2*(fastclk * p * n / m1 )) +
					       refclk) / (2*refclk));
					m = m1 * m2;
					vco = updrate * m;
					if (vco >= limit->vco.min && vco < limit->vco.max) {
						ppm = 1000000 * ((vco / p) - fastclk) / fastclk;
						absppm = (ppm > 0) ? ppm : (-ppm);
						if (absppm < 100 && ((p1 * p2) > (bestp1 * bestp2))) {
							bestppm = 0;
							flag = 1;
						}
						if (absppm < bestppm - 10) {
							bestppm = absppm;
							flag = 1;
						}
						if (flag) {
							bestn = n;
							bestm1 = m1;
							bestm2 = m2;
							bestp1 = p1;
							bestp2 = p2;
							flag = 0;
						}
					}
				}
			}
		}
	}
	best_clock->n = bestn;
	best_clock->m1 = bestm1;
	best_clock->m2 = bestm2;
	best_clock->p1 = bestp1;
	best_clock->p2 = bestp2;

	return true;
}

enum transcoder intel_pipe_to_cpu_transcoder(struct drm_i915_private *dev_priv,
					     enum pipe pipe)
{
	struct drm_crtc *crtc = dev_priv->pipe_to_crtc_mapping[pipe];
	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);

	return intel_crtc->cpu_transcoder;
}

static void ironlake_wait_for_vblank(struct drm_device *dev, int pipe)
{
	struct drm_i915_private *dev_priv = dev->dev_private;
	u32 frame, frame_reg = PIPEFRAME(pipe);

	frame = I915_READ(frame_reg);

	if (wait_for(I915_READ_NOTRACE(frame_reg) != frame, 50))
		DRM_DEBUG_KMS("vblank wait timed out\n");
}

/**
 * intel_wait_for_vblank - wait for vblank on a given pipe
 * @dev: drm device
 * @pipe: pipe to wait for
 *
 * Wait for vblank to occur on a given pipe.  Needed for various bits of
 * mode setting code.
 */
void intel_wait_for_vblank(struct drm_device *dev, int pipe)
{
	struct drm_i915_private *dev_priv = dev->dev_private;
	int pipestat_reg = PIPESTAT(pipe);

	if (INTEL_INFO(dev)->gen >= 5) {
		ironlake_wait_for_vblank(dev, pipe);
		return;
	}

	/* Clear existing vblank status. Note this will clear any other
	 * sticky status fields as well.
	 *
	 * This races with i915_driver_irq_handler() with the result
	 * that either function could miss a vblank event.  Here it is not
	 * fatal, as we will either wait upon the next vblank interrupt or
	 * timeout.  Generally speaking intel_wait_for_vblank() is only
	 * called during modeset at which time the GPU should be idle and
	 * should *not* be performing page flips and thus not waiting on
	 * vblanks...
	 * Currently, the result of us stealing a vblank from the irq
	 * handler is that a single frame will be skipped during swapbuffers.
	 */
	I915_WRITE(pipestat_reg,
		   I915_READ(pipestat_reg) | PIPE_VBLANK_INTERRUPT_STATUS);

	/* Wait for vblank interrupt bit to set */
	if (wait_for(I915_READ(pipestat_reg) &
		     PIPE_VBLANK_INTERRUPT_STATUS,
		     50))
		DRM_DEBUG_KMS("vblank wait timed out\n");
}

/*
 * intel_wait_for_pipe_off - wait for pipe to turn off
 * @dev: drm device
 * @pipe: pipe to wait for
 *
 * After disabling a pipe, we can't wait for vblank in the usual way,
 * spinning on the vblank interrupt status bit, since we won't actually
 * see an interrupt when the pipe is disabled.
 *
 * On Gen4 and above:
 *   wait for the pipe register state bit to turn off
 *
 * Otherwise:
 *   wait for the display line value to settle (it usually
 *   ends up stopping at the start of the next frame).
 *
 */
void intel_wait_for_pipe_off(struct drm_device *dev, int pipe)
{
	struct drm_i915_private *dev_priv = dev->dev_private;
	enum transcoder cpu_transcoder = intel_pipe_to_cpu_transcoder(dev_priv,
								      pipe);

	if (INTEL_INFO(dev)->gen >= 4) {
		int reg = PIPECONF(cpu_transcoder);

		/* Wait for the Pipe State to go off */
		if (wait_for((I915_READ(reg) & I965_PIPECONF_ACTIVE) == 0,
			     100))
			WARN(1, "pipe_off wait timed out\n");
	} else {
		u32 last_line, line_mask;
		int reg = PIPEDSL(pipe);
		unsigned long timeout = jiffies + msecs_to_jiffies(100);

		if (IS_GEN2(dev))
			line_mask = DSL_LINEMASK_GEN2;
		else
			line_mask = DSL_LINEMASK_GEN3;

		/* Wait for the display line to settle */
		do {
			last_line = I915_READ(reg) & line_mask;
			mdelay(5);
		} while (((I915_READ(reg) & line_mask) != last_line) &&
			 time_after(timeout, jiffies));
		if (time_after(jiffies, timeout))
			WARN(1, "pipe_off wait timed out\n");
	}
}

/*
 * ibx_digital_port_connected - is the specified port connected?
 * @dev_priv: i915 private structure
 * @port: the port to test
 *
 * Returns true if @port is connected, false otherwise.
 */
bool ibx_digital_port_connected(struct drm_i915_private *dev_priv,
				struct intel_digital_port *port)
{
	u32 bit;

	if (HAS_PCH_IBX(dev_priv->dev)) {
		switch(port->port) {
		case PORT_B:
			bit = SDE_PORTB_HOTPLUG;
			break;
		case PORT_C:
			bit = SDE_PORTC_HOTPLUG;
			break;
		case PORT_D:
			bit = SDE_PORTD_HOTPLUG;
			break;
		default:
			return true;
		}
	} else {
		switch(port->port) {
		case PORT_B:
			bit = SDE_PORTB_HOTPLUG_CPT;
			break;
		case PORT_C:
			bit = SDE_PORTC_HOTPLUG_CPT;
			break;
		case PORT_D:
			bit = SDE_PORTD_HOTPLUG_CPT;
			break;
		default:
			return true;
		}
	}

	return I915_READ(SDEISR) & bit;
}

static const char *state_string(bool enabled)
{
	return enabled ? "on" : "off";
}

/* Only for pre-ILK configs */
static void assert_pll(struct drm_i915_private *dev_priv,
		       enum pipe pipe, bool state)
{
	int reg;
	u32 val;
	bool cur_state;

	reg = DPLL(pipe);
	val = I915_READ(reg);
	cur_state = !!(val & DPLL_VCO_ENABLE);
	WARN(cur_state != state,
	     "PLL state assertion failure (expected %s, current %s)\n",
	     state_string(state), state_string(cur_state));
}
#define assert_pll_enabled(d, p) assert_pll(d, p, true)
#define assert_pll_disabled(d, p) assert_pll(d, p, false)

/* For ILK+ */
static void assert_pch_pll(struct drm_i915_private *dev_priv,
			   struct intel_pch_pll *pll,
			   struct intel_crtc *crtc,
			   bool state)
{
	u32 val;
	bool cur_state;

	if (HAS_PCH_LPT(dev_priv->dev)) {
		DRM_DEBUG_DRIVER("LPT detected: skipping PCH PLL test\n");
		return;
	}

	if (WARN (!pll,
		  "asserting PCH PLL %s with no PLL\n", state_string(state)))
		return;

	val = I915_READ(pll->pll_reg);
	cur_state = !!(val & DPLL_VCO_ENABLE);
	WARN(cur_state != state,
	     "PCH PLL state for reg %x assertion failure (expected %s, current %s), val=%08x\n",
	     pll->pll_reg, state_string(state), state_string(cur_state), val);

	/* Make sure the selected PLL is correctly attached to the transcoder */
	if (crtc && HAS_PCH_CPT(dev_priv->dev)) {
		u32 pch_dpll;

		pch_dpll = I915_READ(PCH_DPLL_SEL);
		cur_state = pll->pll_reg == _PCH_DPLL_B;
		if (!WARN(((pch_dpll >> (4 * crtc->pipe)) & 1) != cur_state,
			  "PLL[%d] not attached to this transcoder %d: %08x\n",
			  cur_state, crtc->pipe, pch_dpll)) {
			cur_state = !!(val >> (4*crtc->pipe + 3));
			WARN(cur_state != state,
			     "PLL[%d] not %s on this transcoder %d: %08x\n",
			     pll->pll_reg == _PCH_DPLL_B,
			     state_string(state),
			     crtc->pipe,
			     val);
		}
	}
}
#define assert_pch_pll_enabled(d, p, c) assert_pch_pll(d, p, c, true)
#define assert_pch_pll_disabled(d, p, c) assert_pch_pll(d, p, c, false)

static void assert_fdi_tx(struct drm_i915_private *dev_priv,
			  enum pipe pipe, bool state)
{
	int reg;
	u32 val;
	bool cur_state;
	enum transcoder cpu_transcoder = intel_pipe_to_cpu_transcoder(dev_priv,
								      pipe);

	if (HAS_DDI(dev_priv->dev)) {
		/* DDI does not have a specific FDI_TX register */
		reg = TRANS_DDI_FUNC_CTL(cpu_transcoder);
		val = I915_READ(reg);
		cur_state = !!(val & TRANS_DDI_FUNC_ENABLE);
	} else {
		reg = FDI_TX_CTL(pipe);
		val = I915_READ(reg);
		cur_state = !!(val & FDI_TX_ENABLE);
	}
	WARN(cur_state != state,
	     "FDI TX state assertion failure (expected %s, current %s)\n",
	     state_string(state), state_string(cur_state));
}
#define assert_fdi_tx_enabled(d, p) assert_fdi_tx(d, p, true)
#define assert_fdi_tx_disabled(d, p) assert_fdi_tx(d, p, false)

static void assert_fdi_rx(struct drm_i915_private *dev_priv,
			  enum pipe pipe, bool state)
{
	int reg;
	u32 val;
	bool cur_state;

	reg = FDI_RX_CTL(pipe);
	val = I915_READ(reg);
	cur_state = !!(val & FDI_RX_ENABLE);
	WARN(cur_state != state,
	     "FDI RX state assertion failure (expected %s, current %s)\n",
	     state_string(state), state_string(cur_state));
}
#define assert_fdi_rx_enabled(d, p) assert_fdi_rx(d, p, true)
#define assert_fdi_rx_disabled(d, p) assert_fdi_rx(d, p, false)

static void assert_fdi_tx_pll_enabled(struct drm_i915_private *dev_priv,
				      enum pipe pipe)
{
	int reg;
	u32 val;

	/* ILK FDI PLL is always enabled */
	if (dev_priv->info->gen == 5)
		return;

	/* On Haswell, DDI ports are responsible for the FDI PLL setup */
	if (HAS_DDI(dev_priv->dev))
		return;

	reg = FDI_TX_CTL(pipe);
	val = I915_READ(reg);
	WARN(!(val & FDI_TX_PLL_ENABLE), "FDI TX PLL assertion failure, should be active but is disabled\n");
}

static void assert_fdi_rx_pll_enabled(struct drm_i915_private *dev_priv,
				      enum pipe pipe)
{
	int reg;
	u32 val;

	reg = FDI_RX_CTL(pipe);
	val = I915_READ(reg);
	WARN(!(val & FDI_RX_PLL_ENABLE), "FDI RX PLL assertion failure, should be active but is disabled\n");
}

static void assert_panel_unlocked(struct drm_i915_private *dev_priv,
				  enum pipe pipe)
{
	int pp_reg, lvds_reg;
	u32 val;
	enum pipe panel_pipe = PIPE_A;
	bool locked = true;

	if (HAS_PCH_SPLIT(dev_priv->dev)) {
		pp_reg = PCH_PP_CONTROL;
		lvds_reg = PCH_LVDS;
	} else {
		pp_reg = PP_CONTROL;
		lvds_reg = LVDS;
	}

	val = I915_READ(pp_reg);
	if (!(val & PANEL_POWER_ON) ||
	    ((val & PANEL_UNLOCK_REGS) == PANEL_UNLOCK_REGS))
		locked = false;

	if (I915_READ(lvds_reg) & LVDS_PIPEB_SELECT)
		panel_pipe = PIPE_B;

	WARN(panel_pipe == pipe && locked,
	     "panel assertion failure, pipe %c regs locked\n",
	     pipe_name(pipe));
}

void assert_pipe(struct drm_i915_private *dev_priv,
		 enum pipe pipe, bool state)
{
	int reg;
	u32 val;
	bool cur_state;
	enum transcoder cpu_transcoder = intel_pipe_to_cpu_transcoder(dev_priv,
								      pipe);

	/* if we need the pipe A quirk it must be always on */
	if (pipe == PIPE_A && dev_priv->quirks & QUIRK_PIPEA_FORCE)
		state = true;

	if (IS_HASWELL(dev_priv->dev) && cpu_transcoder != TRANSCODER_EDP &&
	    !(I915_READ(HSW_PWR_WELL_DRIVER) & HSW_PWR_WELL_ENABLE)) {
		cur_state = false;
	} else {
		reg = PIPECONF(cpu_transcoder);
		val = I915_READ(reg);
		cur_state = !!(val & PIPECONF_ENABLE);
	}

	WARN(cur_state != state,
	     "pipe %c assertion failure (expected %s, current %s)\n",
	     pipe_name(pipe), state_string(state), state_string(cur_state));
}

static void assert_plane(struct drm_i915_private *dev_priv,
			 enum plane plane, bool state)
{
	int reg;
	u32 val;
	bool cur_state;

	reg = DSPCNTR(plane);
	val = I915_READ(reg);
	cur_state = !!(val & DISPLAY_PLANE_ENABLE);
	WARN(cur_state != state,
	     "plane %c assertion failure (expected %s, current %s)\n",
	     plane_name(plane), state_string(state), state_string(cur_state));
}

#define assert_plane_enabled(d, p) assert_plane(d, p, true)
#define assert_plane_disabled(d, p) assert_plane(d, p, false)

static void assert_planes_disabled(struct drm_i915_private *dev_priv,
				   enum pipe pipe)
{
	int reg, i;
	u32 val;
	int cur_pipe;

	/* Planes are fixed to pipes on ILK+ */
	if (HAS_PCH_SPLIT(dev_priv->dev)) {
		reg = DSPCNTR(pipe);
		val = I915_READ(reg);
		WARN((val & DISPLAY_PLANE_ENABLE),
		     "plane %c assertion failure, should be disabled but not\n",
		     plane_name(pipe));
		return;
	}

	/* Need to check both planes against the pipe */
	for (i = 0; i < 2; i++) {
		reg = DSPCNTR(i);
		val = I915_READ(reg);
		cur_pipe = (val & DISPPLANE_SEL_PIPE_MASK) >>
			DISPPLANE_SEL_PIPE_SHIFT;
		WARN((val & DISPLAY_PLANE_ENABLE) && pipe == cur_pipe,
		     "plane %c assertion failure, should be off on pipe %c but is still active\n",
		     plane_name(i), pipe_name(pipe));
	}
}

static void assert_pch_refclk_enabled(struct drm_i915_private *dev_priv)
{
	u32 val;
	bool enabled;

	if (HAS_PCH_LPT(dev_priv->dev)) {
		DRM_DEBUG_DRIVER("LPT does not has PCH refclk, skipping check\n");
		return;
	}

	val = I915_READ(PCH_DREF_CONTROL);
	enabled = !!(val & (DREF_SSC_SOURCE_MASK | DREF_NONSPREAD_SOURCE_MASK |
			    DREF_SUPERSPREAD_SOURCE_MASK));
	WARN(!enabled, "PCH refclk assertion failure, should be active but is disabled\n");
}

static void assert_transcoder_disabled(struct drm_i915_private *dev_priv,
				       enum pipe pipe)
{
	int reg;
	u32 val;
	bool enabled;

	reg = TRANSCONF(pipe);
	val = I915_READ(reg);
	enabled = !!(val & TRANS_ENABLE);
	WARN(enabled,
	     "transcoder assertion failed, should be off on pipe %c but is still active\n",
	     pipe_name(pipe));
}

static bool dp_pipe_enabled(struct drm_i915_private *dev_priv,
			    enum pipe pipe, u32 port_sel, u32 val)
{
	if ((val & DP_PORT_EN) == 0)
		return false;

	if (HAS_PCH_CPT(dev_priv->dev)) {
		u32	trans_dp_ctl_reg = TRANS_DP_CTL(pipe);
		u32	trans_dp_ctl = I915_READ(trans_dp_ctl_reg);
		if ((trans_dp_ctl & TRANS_DP_PORT_SEL_MASK) != port_sel)
			return false;
	} else {
		if ((val & DP_PIPE_MASK) != (pipe << 30))
			return false;
	}
	return true;
}

static bool hdmi_pipe_enabled(struct drm_i915_private *dev_priv,
			      enum pipe pipe, u32 val)
{
	if ((val & PORT_ENABLE) == 0)
		return false;

	if (HAS_PCH_CPT(dev_priv->dev)) {
		if ((val & PORT_TRANS_SEL_MASK) != PORT_TRANS_SEL_CPT(pipe))
			return false;
	} else {
		if ((val & TRANSCODER_MASK) != TRANSCODER(pipe))
			return false;
	}
	return true;
}

static bool lvds_pipe_enabled(struct drm_i915_private *dev_priv,
			      enum pipe pipe, u32 val)
{
	if ((val & LVDS_PORT_EN) == 0)
		return false;

	if (HAS_PCH_CPT(dev_priv->dev)) {
		if ((val & PORT_TRANS_SEL_MASK) != PORT_TRANS_SEL_CPT(pipe))
			return false;
	} else {
		if ((val & LVDS_PIPE_MASK) != LVDS_PIPE(pipe))
			return false;
	}
	return true;
}

static bool adpa_pipe_enabled(struct drm_i915_private *dev_priv,
			      enum pipe pipe, u32 val)
{
	if ((val & ADPA_DAC_ENABLE) == 0)
		return false;
	if (HAS_PCH_CPT(dev_priv->dev)) {
		if ((val & PORT_TRANS_SEL_MASK) != PORT_TRANS_SEL_CPT(pipe))
			return false;
	} else {
		if ((val & ADPA_PIPE_SELECT_MASK) != ADPA_PIPE_SELECT(pipe))
			return false;
	}
	return true;
}

static void assert_pch_dp_disabled(struct drm_i915_private *dev_priv,
				   enum pipe pipe, int reg, u32 port_sel)
{
	u32 val = I915_READ(reg);
	WARN(dp_pipe_enabled(dev_priv, pipe, port_sel, val),
	     "PCH DP (0x%08x) enabled on transcoder %c, should be disabled\n",
	     reg, pipe_name(pipe));

	WARN(HAS_PCH_IBX(dev_priv->dev) && (val & DP_PORT_EN) == 0
	     && (val & DP_PIPEB_SELECT),
	     "IBX PCH dp port still using transcoder B\n");
}

static void assert_pch_hdmi_disabled(struct drm_i915_private *dev_priv,
				     enum pipe pipe, int reg)
{
	u32 val = I915_READ(reg);
	WARN(hdmi_pipe_enabled(dev_priv, pipe, val),
	     "PCH HDMI (0x%08x) enabled on transcoder %c, should be disabled\n",
	     reg, pipe_name(pipe));

	WARN(HAS_PCH_IBX(dev_priv->dev) && (val & PORT_ENABLE) == 0
	     && (val & SDVO_PIPE_B_SELECT),
	     "IBX PCH hdmi port still using transcoder B\n");
}

static void assert_pch_ports_disabled(struct drm_i915_private *dev_priv,
				      enum pipe pipe)
{
	int reg;
	u32 val;

	assert_pch_dp_disabled(dev_priv, pipe, PCH_DP_B, TRANS_DP_PORT_SEL_B);
	assert_pch_dp_disabled(dev_priv, pipe, PCH_DP_C, TRANS_DP_PORT_SEL_C);
	assert_pch_dp_disabled(dev_priv, pipe, PCH_DP_D, TRANS_DP_PORT_SEL_D);

	reg = PCH_ADPA;
	val = I915_READ(reg);
	WARN(adpa_pipe_enabled(dev_priv, pipe, val),
	     "PCH VGA enabled on transcoder %c, should be disabled\n",
	     pipe_name(pipe));

	reg = PCH_LVDS;
	val = I915_READ(reg);
	WARN(lvds_pipe_enabled(dev_priv, pipe, val),
	     "PCH LVDS enabled on transcoder %c, should be disabled\n",
	     pipe_name(pipe));

	assert_pch_hdmi_disabled(dev_priv, pipe, HDMIB);
	assert_pch_hdmi_disabled(dev_priv, pipe, HDMIC);
	assert_pch_hdmi_disabled(dev_priv, pipe, HDMID);
}

/**
 * intel_enable_pll - enable a PLL
 * @dev_priv: i915 private structure
 * @pipe: pipe PLL to enable
 *
 * Enable @pipe's PLL so we can start pumping pixels from a plane.  Check to
 * make sure the PLL reg is writable first though, since the panel write
 * protect mechanism may be enabled.
 *
 * Note!  This is for pre-ILK only.
 *
 * Unfortunately needed by dvo_ns2501 since the dvo depends on it running.
 */
static void intel_enable_pll(struct drm_i915_private *dev_priv, enum pipe pipe)
{
	int reg;
	u32 val;

	/* No really, not for ILK+ */
	BUG_ON(!IS_VALLEYVIEW(dev_priv->dev) && dev_priv->info->gen >= 5);

	/* PLL is protected by panel, make sure we can write it */
	if (IS_MOBILE(dev_priv->dev) && !IS_I830(dev_priv->dev))
		assert_panel_unlocked(dev_priv, pipe);

	reg = DPLL(pipe);
	val = I915_READ(reg);
	val |= DPLL_VCO_ENABLE;

	/* We do this three times for luck */
	I915_WRITE(reg, val);
	POSTING_READ(reg);
	udelay(150); /* wait for warmup */
	I915_WRITE(reg, val);
	POSTING_READ(reg);
	udelay(150); /* wait for warmup */
	I915_WRITE(reg, val);
	POSTING_READ(reg);
	udelay(150); /* wait for warmup */
}

/**
 * intel_disable_pll - disable a PLL
 * @dev_priv: i915 private structure
 * @pipe: pipe PLL to disable
 *
 * Disable the PLL for @pipe, making sure the pipe is off first.
 *
 * Note!  This is for pre-ILK only.
 */
static void intel_disable_pll(struct drm_i915_private *dev_priv, enum pipe pipe)
{
	int reg;
	u32 val;

	/* Don't disable pipe A or pipe A PLLs if needed */
	if (pipe == PIPE_A && (dev_priv->quirks & QUIRK_PIPEA_FORCE))
		return;

	/* Make sure the pipe isn't still relying on us */
	assert_pipe_disabled(dev_priv, pipe);

	reg = DPLL(pipe);
	val = I915_READ(reg);
	val &= ~DPLL_VCO_ENABLE;
	I915_WRITE(reg, val);
	POSTING_READ(reg);
}

/* SBI access */
static void
intel_sbi_write(struct drm_i915_private *dev_priv, u16 reg, u32 value,
		enum intel_sbi_destination destination)
{
	u32 tmp;

	WARN_ON(!mutex_is_locked(&dev_priv->dpio_lock));

	if (wait_for((I915_READ(SBI_CTL_STAT) & SBI_BUSY) == 0,
				100)) {
		DRM_ERROR("timeout waiting for SBI to become ready\n");
		return;
	}

	I915_WRITE(SBI_ADDR, (reg << 16));
	I915_WRITE(SBI_DATA, value);

	if (destination == SBI_ICLK)
		tmp = SBI_CTL_DEST_ICLK | SBI_CTL_OP_CRWR;
	else
		tmp = SBI_CTL_DEST_MPHY | SBI_CTL_OP_IOWR;
	I915_WRITE(SBI_CTL_STAT, SBI_BUSY | tmp);

	if (wait_for((I915_READ(SBI_CTL_STAT) & (SBI_BUSY | SBI_RESPONSE_FAIL)) == 0,
				100)) {
		DRM_ERROR("timeout waiting for SBI to complete write transaction\n");
		return;
	}
}

static u32
intel_sbi_read(struct drm_i915_private *dev_priv, u16 reg,
	       enum intel_sbi_destination destination)
{
	u32 value = 0;
	WARN_ON(!mutex_is_locked(&dev_priv->dpio_lock));

	if (wait_for((I915_READ(SBI_CTL_STAT) & SBI_BUSY) == 0,
				100)) {
		DRM_ERROR("timeout waiting for SBI to become ready\n");
		return 0;
	}

	I915_WRITE(SBI_ADDR, (reg << 16));

	if (destination == SBI_ICLK)
		value = SBI_CTL_DEST_ICLK | SBI_CTL_OP_CRRD;
	else
		value = SBI_CTL_DEST_MPHY | SBI_CTL_OP_IORD;
	I915_WRITE(SBI_CTL_STAT, value | SBI_BUSY);

	if (wait_for((I915_READ(SBI_CTL_STAT) & (SBI_BUSY | SBI_RESPONSE_FAIL)) == 0,
				100)) {
		DRM_ERROR("timeout waiting for SBI to complete read transaction\n");
		return 0;
	}

	return I915_READ(SBI_DATA);
}

/**
 * ironlake_enable_pch_pll - enable PCH PLL
 * @dev_priv: i915 private structure
 * @pipe: pipe PLL to enable
 *
 * The PCH PLL needs to be enabled before the PCH transcoder, since it
 * drives the transcoder clock.
 */
static void ironlake_enable_pch_pll(struct intel_crtc *intel_crtc)
{
	struct drm_i915_private *dev_priv = intel_crtc->base.dev->dev_private;
	struct intel_pch_pll *pll;
	int reg;
	u32 val;

	/* PCH PLLs only available on ILK, SNB and IVB */
	BUG_ON(dev_priv->info->gen < 5);
	pll = intel_crtc->pch_pll;
	if (pll == NULL)
		return;

	if (WARN_ON(pll->refcount == 0))
		return;

	DRM_DEBUG_KMS("enable PCH PLL %x (active %d, on? %d)for crtc %d\n",
		      pll->pll_reg, pll->active, pll->on,
		      intel_crtc->base.base.id);

	/* PCH refclock must be enabled first */
	assert_pch_refclk_enabled(dev_priv);

	if (pll->active++ && pll->on) {
		assert_pch_pll_enabled(dev_priv, pll, NULL);
		return;
	}

	DRM_DEBUG_KMS("enabling PCH PLL %x\n", pll->pll_reg);

	reg = pll->pll_reg;
	val = I915_READ(reg);
	val |= DPLL_VCO_ENABLE;
	I915_WRITE(reg, val);
	POSTING_READ(reg);
	udelay(200);

	pll->on = true;
}

static void intel_disable_pch_pll(struct intel_crtc *intel_crtc)
{
	struct drm_i915_private *dev_priv = intel_crtc->base.dev->dev_private;
	struct intel_pch_pll *pll = intel_crtc->pch_pll;
	int reg;
	u32 val;

	/* PCH only available on ILK+ */
	BUG_ON(dev_priv->info->gen < 5);
	if (pll == NULL)
	       return;

	if (WARN_ON(pll->refcount == 0))
		return;

	DRM_DEBUG_KMS("disable PCH PLL %x (active %d, on? %d) for crtc %d\n",
		      pll->pll_reg, pll->active, pll->on,
		      intel_crtc->base.base.id);

	if (WARN_ON(pll->active == 0)) {
		assert_pch_pll_disabled(dev_priv, pll, NULL);
		return;
	}

	if (--pll->active) {
		assert_pch_pll_enabled(dev_priv, pll, NULL);
		return;
	}

	DRM_DEBUG_KMS("disabling PCH PLL %x\n", pll->pll_reg);

	/* Make sure transcoder isn't still depending on us */
	assert_transcoder_disabled(dev_priv, intel_crtc->pipe);

	reg = pll->pll_reg;
	val = I915_READ(reg);
	val &= ~DPLL_VCO_ENABLE;
	I915_WRITE(reg, val);
	POSTING_READ(reg);
	udelay(200);

	pll->on = false;
}

static void ironlake_enable_pch_transcoder(struct drm_i915_private *dev_priv,
					   enum pipe pipe)
{
	struct drm_device *dev = dev_priv->dev;
	struct drm_crtc *crtc = dev_priv->pipe_to_crtc_mapping[pipe];
	uint32_t reg, val, pipeconf_val;

	/* PCH only available on ILK+ */
	BUG_ON(dev_priv->info->gen < 5);

	/* Make sure PCH DPLL is enabled */
	assert_pch_pll_enabled(dev_priv,
			       to_intel_crtc(crtc)->pch_pll,
			       to_intel_crtc(crtc));

	/* FDI must be feeding us bits for PCH ports */
	assert_fdi_tx_enabled(dev_priv, pipe);
	assert_fdi_rx_enabled(dev_priv, pipe);

	if (HAS_PCH_CPT(dev)) {
		/* Workaround: Set the timing override bit before enabling the
		 * pch transcoder. */
		reg = TRANS_CHICKEN2(pipe);
		val = I915_READ(reg);
		val |= TRANS_CHICKEN2_TIMING_OVERRIDE;
		I915_WRITE(reg, val);
	}

	reg = TRANSCONF(pipe);
	val = I915_READ(reg);
	pipeconf_val = I915_READ(PIPECONF(pipe));

	if (HAS_PCH_IBX(dev_priv->dev)) {
		/*
		 * make the BPC in transcoder be consistent with
		 * that in pipeconf reg.
		 */
		val &= ~PIPECONF_BPC_MASK;
		val |= pipeconf_val & PIPECONF_BPC_MASK;
	}

	val &= ~TRANS_INTERLACE_MASK;
	if ((pipeconf_val & PIPECONF_INTERLACE_MASK) == PIPECONF_INTERLACED_ILK)
		if (HAS_PCH_IBX(dev_priv->dev) &&
		    intel_pipe_has_type(crtc, INTEL_OUTPUT_SDVO))
			val |= TRANS_LEGACY_INTERLACED_ILK;
		else
			val |= TRANS_INTERLACED;
	else
		val |= TRANS_PROGRESSIVE;

	I915_WRITE(reg, val | TRANS_ENABLE);
	if (wait_for(I915_READ(reg) & TRANS_STATE_ENABLE, 100))
		DRM_ERROR("failed to enable transcoder %d\n", pipe);
}

static void lpt_enable_pch_transcoder(struct drm_i915_private *dev_priv,
				      enum transcoder cpu_transcoder)
{
	u32 val, pipeconf_val;

	/* PCH only available on ILK+ */
	BUG_ON(dev_priv->info->gen < 5);

	/* FDI must be feeding us bits for PCH ports */
	assert_fdi_tx_enabled(dev_priv, (enum pipe) cpu_transcoder);
	assert_fdi_rx_enabled(dev_priv, TRANSCODER_A);

	/* Workaround: set timing override bit. */
	val = I915_READ(_TRANSA_CHICKEN2);
	val |= TRANS_CHICKEN2_TIMING_OVERRIDE;
	I915_WRITE(_TRANSA_CHICKEN2, val);

	val = TRANS_ENABLE;
	pipeconf_val = I915_READ(PIPECONF(cpu_transcoder));

	if ((pipeconf_val & PIPECONF_INTERLACE_MASK_HSW) ==
	    PIPECONF_INTERLACED_ILK)
		val |= TRANS_INTERLACED;
	else
		val |= TRANS_PROGRESSIVE;

	I915_WRITE(TRANSCONF(TRANSCODER_A), val);
	if (wait_for(I915_READ(_TRANSACONF) & TRANS_STATE_ENABLE, 100))
		DRM_ERROR("Failed to enable PCH transcoder\n");
}

static void ironlake_disable_pch_transcoder(struct drm_i915_private *dev_priv,
					    enum pipe pipe)
{
	struct drm_device *dev = dev_priv->dev;
	uint32_t reg, val;

	/* FDI relies on the transcoder */
	assert_fdi_tx_disabled(dev_priv, pipe);
	assert_fdi_rx_disabled(dev_priv, pipe);

	/* Ports must be off as well */
	assert_pch_ports_disabled(dev_priv, pipe);

	reg = TRANSCONF(pipe);
	val = I915_READ(reg);
	val &= ~TRANS_ENABLE;
	I915_WRITE(reg, val);
	/* wait for PCH transcoder off, transcoder state */
	if (wait_for((I915_READ(reg) & TRANS_STATE_ENABLE) == 0, 50))
		DRM_ERROR("failed to disable transcoder %d\n", pipe);

	if (!HAS_PCH_IBX(dev)) {
		/* Workaround: Clear the timing override chicken bit again. */
		reg = TRANS_CHICKEN2(pipe);
		val = I915_READ(reg);
		val &= ~TRANS_CHICKEN2_TIMING_OVERRIDE;
		I915_WRITE(reg, val);
	}
}

static void lpt_disable_pch_transcoder(struct drm_i915_private *dev_priv)
{
	u32 val;

	val = I915_READ(_TRANSACONF);
	val &= ~TRANS_ENABLE;
	I915_WRITE(_TRANSACONF, val);
	/* wait for PCH transcoder off, transcoder state */
	if (wait_for((I915_READ(_TRANSACONF) & TRANS_STATE_ENABLE) == 0, 50))
		DRM_ERROR("Failed to disable PCH transcoder\n");

	/* Workaround: clear timing override bit. */
	val = I915_READ(_TRANSA_CHICKEN2);
	val &= ~TRANS_CHICKEN2_TIMING_OVERRIDE;
	I915_WRITE(_TRANSA_CHICKEN2, val);
}

/**
 * intel_enable_pipe - enable a pipe, asserting requirements
 * @dev_priv: i915 private structure
 * @pipe: pipe to enable
 * @pch_port: on ILK+, is this pipe driving a PCH port or not
 *
 * Enable @pipe, making sure that various hardware specific requirements
 * are met, if applicable, e.g. PLL enabled, LVDS pairs enabled, etc.
 *
 * @pipe should be %PIPE_A or %PIPE_B.
 *
 * Will wait until the pipe is actually running (i.e. first vblank) before
 * returning.
 */
static void intel_enable_pipe(struct drm_i915_private *dev_priv, enum pipe pipe,
			      bool pch_port)
{
	enum transcoder cpu_transcoder = intel_pipe_to_cpu_transcoder(dev_priv,
								      pipe);
	enum pipe pch_transcoder;
	int reg;
	u32 val;

	if (HAS_PCH_LPT(dev_priv->dev))
		pch_transcoder = TRANSCODER_A;
	else
		pch_transcoder = pipe;

	/*
	 * A pipe without a PLL won't actually be able to drive bits from
	 * a plane.  On ILK+ the pipe PLLs are integrated, so we don't
	 * need the check.
	 */
	if (!HAS_PCH_SPLIT(dev_priv->dev))
		assert_pll_enabled(dev_priv, pipe);
	else {
		if (pch_port) {
			/* if driving the PCH, we need FDI enabled */
			assert_fdi_rx_pll_enabled(dev_priv, pch_transcoder);
			assert_fdi_tx_pll_enabled(dev_priv,
						  (enum pipe) cpu_transcoder);
		}
		/* FIXME: assert CPU port conditions for SNB+ */
	}

	reg = PIPECONF(cpu_transcoder);
	val = I915_READ(reg);
	if (val & PIPECONF_ENABLE)
		return;

	I915_WRITE(reg, val | PIPECONF_ENABLE);
	intel_wait_for_vblank(dev_priv->dev, pipe);
}

/**
 * intel_disable_pipe - disable a pipe, asserting requirements
 * @dev_priv: i915 private structure
 * @pipe: pipe to disable
 *
 * Disable @pipe, making sure that various hardware specific requirements
 * are met, if applicable, e.g. plane disabled, panel fitter off, etc.
 *
 * @pipe should be %PIPE_A or %PIPE_B.
 *
 * Will wait until the pipe has shut down before returning.
 */
static void intel_disable_pipe(struct drm_i915_private *dev_priv,
			       enum pipe pipe)
{
	enum transcoder cpu_transcoder = intel_pipe_to_cpu_transcoder(dev_priv,
								      pipe);
	int reg;
	u32 val;

	/*
	 * Make sure planes won't keep trying to pump pixels to us,
	 * or we might hang the display.
	 */
	assert_planes_disabled(dev_priv, pipe);

	/* Don't disable pipe A or pipe A PLLs if needed */
	if (pipe == PIPE_A && (dev_priv->quirks & QUIRK_PIPEA_FORCE))
		return;

	reg = PIPECONF(cpu_transcoder);
	val = I915_READ(reg);
	if ((val & PIPECONF_ENABLE) == 0)
		return;

	I915_WRITE(reg, val & ~PIPECONF_ENABLE);
	intel_wait_for_pipe_off(dev_priv->dev, pipe);
}

/*
 * Plane regs are double buffered, going from enabled->disabled needs a
 * trigger in order to latch.  The display address reg provides this.
 */
void intel_flush_display_plane(struct drm_i915_private *dev_priv,
				      enum plane plane)
{
	if (dev_priv->info->gen >= 4)
		I915_WRITE(DSPSURF(plane), I915_READ(DSPSURF(plane)));
	else
		I915_WRITE(DSPADDR(plane), I915_READ(DSPADDR(plane)));
}

/**
 * intel_enable_plane - enable a display plane on a given pipe
 * @dev_priv: i915 private structure
 * @plane: plane to enable
 * @pipe: pipe being fed
 *
 * Enable @plane on @pipe, making sure that @pipe is running first.
 */
static void intel_enable_plane(struct drm_i915_private *dev_priv,
			       enum plane plane, enum pipe pipe)
{
	int reg;
	u32 val;

	/* If the pipe isn't enabled, we can't pump pixels and may hang */
	assert_pipe_enabled(dev_priv, pipe);

	reg = DSPCNTR(plane);
	val = I915_READ(reg);
	if (val & DISPLAY_PLANE_ENABLE)
		return;

	I915_WRITE(reg, val | DISPLAY_PLANE_ENABLE);
	intel_flush_display_plane(dev_priv, plane);
	intel_wait_for_vblank(dev_priv->dev, pipe);
}

/**
 * intel_disable_plane - disable a display plane
 * @dev_priv: i915 private structure
 * @plane: plane to disable
 * @pipe: pipe consuming the data
 *
 * Disable @plane; should be an independent operation.
 */
static void intel_disable_plane(struct drm_i915_private *dev_priv,
				enum plane plane, enum pipe pipe)
{
	int reg;
	u32 val;

	reg = DSPCNTR(plane);
	val = I915_READ(reg);
	if ((val & DISPLAY_PLANE_ENABLE) == 0)
		return;

	I915_WRITE(reg, val & ~DISPLAY_PLANE_ENABLE);
	intel_flush_display_plane(dev_priv, plane);
	intel_wait_for_vblank(dev_priv->dev, pipe);
}

int
intel_pin_and_fence_fb_obj(struct drm_device *dev,
			   struct drm_i915_gem_object *obj,
			   struct intel_ring_buffer *pipelined)
{
	struct drm_i915_private *dev_priv = dev->dev_private;
	u32 alignment;
	int ret;

	switch (obj->tiling_mode) {
	case I915_TILING_NONE:
		if (IS_BROADWATER(dev) || IS_CRESTLINE(dev))
			alignment = 128 * 1024;
		else if (INTEL_INFO(dev)->gen >= 4)
			alignment = 4 * 1024;
		else
			alignment = 64 * 1024;
		break;
	case I915_TILING_X:
		/* pin() will align the object as required by fence */
		alignment = 0;
		break;
	case I915_TILING_Y:
		/* FIXME: Is this true? */
		DRM_ERROR("Y tiled not allowed for scan out buffers\n");
		return -EINVAL;
	default:
		BUG();
	}

	dev_priv->mm.interruptible = false;
	ret = i915_gem_object_pin_to_display_plane(obj, alignment, pipelined);
	if (ret)
		goto err_interruptible;

	/* Install a fence for tiled scan-out. Pre-i965 always needs a
	 * fence, whereas 965+ only requires a fence if using
	 * framebuffer compression.  For simplicity, we always install
	 * a fence as the cost is not that onerous.
	 */
	ret = i915_gem_object_get_fence(obj);
	if (ret)
		goto err_unpin;

	i915_gem_object_pin_fence(obj);

	dev_priv->mm.interruptible = true;
	return 0;

err_unpin:
	i915_gem_object_unpin(obj);
err_interruptible:
	dev_priv->mm.interruptible = true;
	return ret;
}

void intel_unpin_fb_obj(struct drm_i915_gem_object *obj)
{
	i915_gem_object_unpin_fence(obj);
	i915_gem_object_unpin(obj);
}

/* Computes the linear offset to the base tile and adjusts x, y. bytes per pixel
 * is assumed to be a power-of-two. */
unsigned long intel_gen4_compute_page_offset(int *x, int *y,
					     unsigned int tiling_mode,
					     unsigned int cpp,
					     unsigned int pitch)
{
	if (tiling_mode != I915_TILING_NONE) {
		unsigned int tile_rows, tiles;

		tile_rows = *y / 8;
		*y %= 8;

		tiles = *x / (512/cpp);
		*x %= 512/cpp;

		return tile_rows * pitch * 8 + tiles * 4096;
	} else {
		unsigned int offset;

		offset = *y * pitch + *x * cpp;
		*y = 0;
		*x = (offset & 4095) / cpp;
		return offset & -4096;
	}
}

static int i9xx_update_plane(struct drm_crtc *crtc, struct drm_framebuffer *fb,
			     int x, int y)
{
	struct drm_device *dev = crtc->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
	struct intel_framebuffer *intel_fb;
	struct drm_i915_gem_object *obj;
	int plane = intel_crtc->plane;
	unsigned long linear_offset;
	u32 dspcntr;
	u32 reg;

	switch (plane) {
	case 0:
	case 1:
		break;
	default:
		DRM_ERROR("Can't update plane %d in SAREA\n", plane);
		return -EINVAL;
	}

	intel_fb = to_intel_framebuffer(fb);
	obj = intel_fb->obj;

	reg = DSPCNTR(plane);
	dspcntr = I915_READ(reg);
	/* Mask out pixel format bits in case we change it */
	dspcntr &= ~DISPPLANE_PIXFORMAT_MASK;
	switch (fb->pixel_format) {
	case DRM_FORMAT_C8:
		dspcntr |= DISPPLANE_8BPP;
		break;
	case DRM_FORMAT_XRGB1555:
	case DRM_FORMAT_ARGB1555:
		dspcntr |= DISPPLANE_BGRX555;
		break;
	case DRM_FORMAT_RGB565:
		dspcntr |= DISPPLANE_BGRX565;
		break;
	case DRM_FORMAT_XRGB8888:
	case DRM_FORMAT_ARGB8888:
		dspcntr |= DISPPLANE_BGRX888;
		break;
	case DRM_FORMAT_XBGR8888:
	case DRM_FORMAT_ABGR8888:
		dspcntr |= DISPPLANE_RGBX888;
		break;
	case DRM_FORMAT_XRGB2101010:
	case DRM_FORMAT_ARGB2101010:
		dspcntr |= DISPPLANE_BGRX101010;
		break;
	case DRM_FORMAT_XBGR2101010:
	case DRM_FORMAT_ABGR2101010:
		dspcntr |= DISPPLANE_RGBX101010;
		break;
	default:
		DRM_ERROR("Unknown pixel format 0x%08x\n", fb->pixel_format);
		return -EINVAL;
	}

	if (INTEL_INFO(dev)->gen >= 4) {
		if (obj->tiling_mode != I915_TILING_NONE)
			dspcntr |= DISPPLANE_TILED;
		else
			dspcntr &= ~DISPPLANE_TILED;
	}

	I915_WRITE(reg, dspcntr);

	linear_offset = y * fb->pitches[0] + x * (fb->bits_per_pixel / 8);

	if (INTEL_INFO(dev)->gen >= 4) {
		intel_crtc->dspaddr_offset =
			intel_gen4_compute_page_offset(&x, &y, obj->tiling_mode,
						       fb->bits_per_pixel / 8,
						       fb->pitches[0]);
		linear_offset -= intel_crtc->dspaddr_offset;
	} else {
		intel_crtc->dspaddr_offset = linear_offset;
	}

	DRM_DEBUG_KMS("Writing base %08X %08lX %d %d %d\n",
		      obj->gtt_offset, linear_offset, x, y, fb->pitches[0]);
	I915_WRITE(DSPSTRIDE(plane), fb->pitches[0]);
	if (INTEL_INFO(dev)->gen >= 4) {
		I915_MODIFY_DISPBASE(DSPSURF(plane),
				     obj->gtt_offset + intel_crtc->dspaddr_offset);
		I915_WRITE(DSPTILEOFF(plane), (y << 16) | x);
		I915_WRITE(DSPLINOFF(plane), linear_offset);
	} else
		I915_WRITE(DSPADDR(plane), obj->gtt_offset + linear_offset);
	POSTING_READ(reg);

	return 0;
}

static int ironlake_update_plane(struct drm_crtc *crtc,
				 struct drm_framebuffer *fb, int x, int y)
{
	struct drm_device *dev = crtc->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
	struct intel_framebuffer *intel_fb;
	struct drm_i915_gem_object *obj;
	int plane = intel_crtc->plane;
	unsigned long linear_offset;
	u32 dspcntr;
	u32 reg;

	switch (plane) {
	case 0:
	case 1:
	case 2:
		break;
	default:
		DRM_ERROR("Can't update plane %d in SAREA\n", plane);
		return -EINVAL;
	}

	intel_fb = to_intel_framebuffer(fb);
	obj = intel_fb->obj;

	reg = DSPCNTR(plane);
	dspcntr = I915_READ(reg);
	/* Mask out pixel format bits in case we change it */
	dspcntr &= ~DISPPLANE_PIXFORMAT_MASK;
	switch (fb->pixel_format) {
	case DRM_FORMAT_C8:
		dspcntr |= DISPPLANE_8BPP;
		break;
	case DRM_FORMAT_RGB565:
		dspcntr |= DISPPLANE_BGRX565;
		break;
	case DRM_FORMAT_XRGB8888:
	case DRM_FORMAT_ARGB8888:
		dspcntr |= DISPPLANE_BGRX888;
		break;
	case DRM_FORMAT_XBGR8888:
	case DRM_FORMAT_ABGR8888:
		dspcntr |= DISPPLANE_RGBX888;
		break;
	case DRM_FORMAT_XRGB2101010:
	case DRM_FORMAT_ARGB2101010:
		dspcntr |= DISPPLANE_BGRX101010;
		break;
	case DRM_FORMAT_XBGR2101010:
	case DRM_FORMAT_ABGR2101010:
		dspcntr |= DISPPLANE_RGBX101010;
		break;
	default:
		DRM_ERROR("Unknown pixel format 0x%08x\n", fb->pixel_format);
		return -EINVAL;
	}

	if (obj->tiling_mode != I915_TILING_NONE)
		dspcntr |= DISPPLANE_TILED;
	else
		dspcntr &= ~DISPPLANE_TILED;

	/* must disable */
	dspcntr |= DISPPLANE_TRICKLE_FEED_DISABLE;

	I915_WRITE(reg, dspcntr);

	linear_offset = y * fb->pitches[0] + x * (fb->bits_per_pixel / 8);
	intel_crtc->dspaddr_offset =
		intel_gen4_compute_page_offset(&x, &y, obj->tiling_mode,
					       fb->bits_per_pixel / 8,
					       fb->pitches[0]);
	linear_offset -= intel_crtc->dspaddr_offset;

	DRM_DEBUG_KMS("Writing base %08X %08lX %d %d %d\n",
		      obj->gtt_offset, linear_offset, x, y, fb->pitches[0]);
	I915_WRITE(DSPSTRIDE(plane), fb->pitches[0]);
	I915_MODIFY_DISPBASE(DSPSURF(plane),
			     obj->gtt_offset + intel_crtc->dspaddr_offset);
	if (IS_HASWELL(dev)) {
		I915_WRITE(DSPOFFSET(plane), (y << 16) | x);
	} else {
		I915_WRITE(DSPTILEOFF(plane), (y << 16) | x);
		I915_WRITE(DSPLINOFF(plane), linear_offset);
	}
	POSTING_READ(reg);

	return 0;
}

/* Assume fb object is pinned & idle & fenced and just update base pointers */
static int
intel_pipe_set_base_atomic(struct drm_crtc *crtc, struct drm_framebuffer *fb,
			   int x, int y, enum mode_set_atomic state)
{
	struct drm_device *dev = crtc->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;

	if (dev_priv->display.disable_fbc)
		dev_priv->display.disable_fbc(dev);
	intel_increase_pllclock(crtc);

	return dev_priv->display.update_plane(crtc, fb, x, y);
}

static int
intel_finish_fb(struct drm_framebuffer *old_fb)
{
	struct drm_i915_gem_object *obj = to_intel_framebuffer(old_fb)->obj;
	struct drm_i915_private *dev_priv = obj->base.dev->dev_private;
	bool was_interruptible = dev_priv->mm.interruptible;
	int ret;

	/* Big Hammer, we also need to ensure that any pending
	 * MI_WAIT_FOR_EVENT inside a user batch buffer on the
	 * current scanout is retired before unpinning the old
	 * framebuffer.
	 *
	 * This should only fail upon a hung GPU, in which case we
	 * can safely continue.
	 */
	dev_priv->mm.interruptible = false;
	ret = i915_gem_object_finish_gpu(obj);
	dev_priv->mm.interruptible = was_interruptible;

	return ret;
}

static void intel_crtc_update_sarea_pos(struct drm_crtc *crtc, int x, int y)
{
	struct drm_device *dev = crtc->dev;
	struct drm_i915_master_private *master_priv;
	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);

	if (!dev->primary->master)
		return;

	master_priv = dev->primary->master->driver_priv;
	if (!master_priv->sarea_priv)
		return;

	switch (intel_crtc->pipe) {
	case 0:
		master_priv->sarea_priv->pipeA_x = x;
		master_priv->sarea_priv->pipeA_y = y;
		break;
	case 1:
		master_priv->sarea_priv->pipeB_x = x;
		master_priv->sarea_priv->pipeB_y = y;
		break;
	default:
		break;
	}
}

static int
intel_pipe_set_base(struct drm_crtc *crtc, int x, int y,
		    struct drm_framebuffer *fb)
{
	struct drm_device *dev = crtc->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
	struct drm_framebuffer *old_fb;
	int ret;

	/* no fb bound */
	if (!fb) {
		DRM_ERROR("No FB bound\n");
		return 0;
	}

	if(intel_crtc->plane > dev_priv->num_pipe) {
		DRM_ERROR("no plane for crtc: plane %d, num_pipes %d\n",
				intel_crtc->plane,
				dev_priv->num_pipe);
		return -EINVAL;
	}

	mutex_lock(&dev->struct_mutex);
	ret = intel_pin_and_fence_fb_obj(dev,
					 to_intel_framebuffer(fb)->obj,
					 NULL);
	if (ret != 0) {
		mutex_unlock(&dev->struct_mutex);
		DRM_ERROR("pin & fence failed\n");
		return ret;
	}

	if (crtc->fb)
		intel_finish_fb(crtc->fb);

	ret = dev_priv->display.update_plane(crtc, fb, x, y);
	if (ret) {
		intel_unpin_fb_obj(to_intel_framebuffer(fb)->obj);
		mutex_unlock(&dev->struct_mutex);
		DRM_ERROR("failed to update base address\n");
		return ret;
	}

	old_fb = crtc->fb;
	crtc->fb = fb;
	crtc->x = x;
	crtc->y = y;

	if (old_fb) {
		intel_wait_for_vblank(dev, intel_crtc->pipe);
		intel_unpin_fb_obj(to_intel_framebuffer(old_fb)->obj);
	}

	intel_update_fbc(dev);
	mutex_unlock(&dev->struct_mutex);

	intel_crtc_update_sarea_pos(crtc, x, y);

	return 0;
}

static void intel_fdi_normal_train(struct drm_crtc *crtc)
{
	struct drm_device *dev = crtc->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
	int pipe = intel_crtc->pipe;
	u32 reg, temp;

	/* enable normal train */
	reg = FDI_TX_CTL(pipe);
	temp = I915_READ(reg);
	if (IS_IVYBRIDGE(dev)) {
		temp &= ~FDI_LINK_TRAIN_NONE_IVB;
		temp |= FDI_LINK_TRAIN_NONE_IVB | FDI_TX_ENHANCE_FRAME_ENABLE;
	} else {
		temp &= ~FDI_LINK_TRAIN_NONE;
		temp |= FDI_LINK_TRAIN_NONE | FDI_TX_ENHANCE_FRAME_ENABLE;
	}
	I915_WRITE(reg, temp);

	reg = FDI_RX_CTL(pipe);
	temp = I915_READ(reg);
	if (HAS_PCH_CPT(dev)) {
		temp &= ~FDI_LINK_TRAIN_PATTERN_MASK_CPT;
		temp |= FDI_LINK_TRAIN_NORMAL_CPT;
	} else {
		temp &= ~FDI_LINK_TRAIN_NONE;
		temp |= FDI_LINK_TRAIN_NONE;
	}
	I915_WRITE(reg, temp | FDI_RX_ENHANCE_FRAME_ENABLE);

	/* wait one idle pattern time */
	POSTING_READ(reg);
	udelay(1000);

	/* IVB wants error correction enabled */
	if (IS_IVYBRIDGE(dev))
		I915_WRITE(reg, I915_READ(reg) | FDI_FS_ERRC_ENABLE |
			   FDI_FE_ERRC_ENABLE);
}

static void ivb_modeset_global_resources(struct drm_device *dev)
{
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_crtc *pipe_B_crtc =
		to_intel_crtc(dev_priv->pipe_to_crtc_mapping[PIPE_B]);
	struct intel_crtc *pipe_C_crtc =
		to_intel_crtc(dev_priv->pipe_to_crtc_mapping[PIPE_C]);
	uint32_t temp;

	/* When everything is off disable fdi C so that we could enable fdi B
	 * with all lanes. XXX: This misses the case where a pipe is not using
	 * any pch resources and so doesn't need any fdi lanes. */
	if (!pipe_B_crtc->base.enabled && !pipe_C_crtc->base.enabled) {
		WARN_ON(I915_READ(FDI_RX_CTL(PIPE_B)) & FDI_RX_ENABLE);
		WARN_ON(I915_READ(FDI_RX_CTL(PIPE_C)) & FDI_RX_ENABLE);

		temp = I915_READ(SOUTH_CHICKEN1);
		temp &= ~FDI_BC_BIFURCATION_SELECT;
		DRM_DEBUG_KMS("disabling fdi C rx\n");
		I915_WRITE(SOUTH_CHICKEN1, temp);
	}
}

/* The FDI link training functions for ILK/Ibexpeak. */
static void ironlake_fdi_link_train(struct drm_crtc *crtc)
{
	struct drm_device *dev = crtc->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
	int pipe = intel_crtc->pipe;
	int plane = intel_crtc->plane;
	u32 reg, temp, tries;

	/* FDI needs bits from pipe & plane first */
	assert_pipe_enabled(dev_priv, pipe);
	assert_plane_enabled(dev_priv, plane);

	/* Train 1: umask FDI RX Interrupt symbol_lock and bit_lock bit
	   for train result */
	reg = FDI_RX_IMR(pipe);
	temp = I915_READ(reg);
	temp &= ~FDI_RX_SYMBOL_LOCK;
	temp &= ~FDI_RX_BIT_LOCK;
	I915_WRITE(reg, temp);
	I915_READ(reg);
	udelay(150);

	/* enable CPU FDI TX and PCH FDI RX */
	reg = FDI_TX_CTL(pipe);
	temp = I915_READ(reg);
	temp &= ~(7 << 19);
	temp |= (intel_crtc->fdi_lanes - 1) << 19;
	temp &= ~FDI_LINK_TRAIN_NONE;
	temp |= FDI_LINK_TRAIN_PATTERN_1;
	I915_WRITE(reg, temp | FDI_TX_ENABLE);

	reg = FDI_RX_CTL(pipe);
	temp = I915_READ(reg);
	temp &= ~FDI_LINK_TRAIN_NONE;
	temp |= FDI_LINK_TRAIN_PATTERN_1;
	I915_WRITE(reg, temp | FDI_RX_ENABLE);

	POSTING_READ(reg);
	udelay(150);

	/* Ironlake workaround, enable clock pointer after FDI enable*/
	I915_WRITE(FDI_RX_CHICKEN(pipe), FDI_RX_PHASE_SYNC_POINTER_OVR);
	I915_WRITE(FDI_RX_CHICKEN(pipe), FDI_RX_PHASE_SYNC_POINTER_OVR |
		   FDI_RX_PHASE_SYNC_POINTER_EN);

	reg = FDI_RX_IIR(pipe);
	for (tries = 0; tries < 5; tries++) {
		temp = I915_READ(reg);
		DRM_DEBUG_KMS("FDI_RX_IIR 0x%x\n", temp);

		if ((temp & FDI_RX_BIT_LOCK)) {
			DRM_DEBUG_KMS("FDI train 1 done.\n");
			I915_WRITE(reg, temp | FDI_RX_BIT_LOCK);
			break;
		}
	}
	if (tries == 5)
		DRM_ERROR("FDI train 1 fail!\n");

	/* Train 2 */
	reg = FDI_TX_CTL(pipe);
	temp = I915_READ(reg);
	temp &= ~FDI_LINK_TRAIN_NONE;
	temp |= FDI_LINK_TRAIN_PATTERN_2;
	I915_WRITE(reg, temp);

	reg = FDI_RX_CTL(pipe);
	temp = I915_READ(reg);
	temp &= ~FDI_LINK_TRAIN_NONE;
	temp |= FDI_LINK_TRAIN_PATTERN_2;
	I915_WRITE(reg, temp);

	POSTING_READ(reg);
	udelay(150);

	reg = FDI_RX_IIR(pipe);
	for (tries = 0; tries < 5; tries++) {
		temp = I915_READ(reg);
		DRM_DEBUG_KMS("FDI_RX_IIR 0x%x\n", temp);

		if (temp & FDI_RX_SYMBOL_LOCK) {
			I915_WRITE(reg, temp | FDI_RX_SYMBOL_LOCK);
			DRM_DEBUG_KMS("FDI train 2 done.\n");
			break;
		}
	}
	if (tries == 5)
		DRM_ERROR("FDI train 2 fail!\n");

	DRM_DEBUG_KMS("FDI train done\n");

}

static const int snb_b_fdi_train_param[] = {
	FDI_LINK_TRAIN_400MV_0DB_SNB_B,
	FDI_LINK_TRAIN_400MV_6DB_SNB_B,
	FDI_LINK_TRAIN_600MV_3_5DB_SNB_B,
	FDI_LINK_TRAIN_800MV_0DB_SNB_B,
};

/* The FDI link training functions for SNB/Cougarpoint. */
static void gen6_fdi_link_train(struct drm_crtc *crtc)
{
	struct drm_device *dev = crtc->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
	int pipe = intel_crtc->pipe;
	u32 reg, temp, i, retry;

	/* Train 1: umask FDI RX Interrupt symbol_lock and bit_lock bit
	   for train result */
	reg = FDI_RX_IMR(pipe);
	temp = I915_READ(reg);
	temp &= ~FDI_RX_SYMBOL_LOCK;
	temp &= ~FDI_RX_BIT_LOCK;
	I915_WRITE(reg, temp);

	POSTING_READ(reg);
	udelay(150);

	/* enable CPU FDI TX and PCH FDI RX */
	reg = FDI_TX_CTL(pipe);
	temp = I915_READ(reg);
	temp &= ~(7 << 19);
	temp |= (intel_crtc->fdi_lanes - 1) << 19;
	temp &= ~FDI_LINK_TRAIN_NONE;
	temp |= FDI_LINK_TRAIN_PATTERN_1;
	temp &= ~FDI_LINK_TRAIN_VOL_EMP_MASK;
	/* SNB-B */
	temp |= FDI_LINK_TRAIN_400MV_0DB_SNB_B;
	I915_WRITE(reg, temp | FDI_TX_ENABLE);

	I915_WRITE(FDI_RX_MISC(pipe),
		   FDI_RX_TP1_TO_TP2_48 | FDI_RX_FDI_DELAY_90);

	reg = FDI_RX_CTL(pipe);
	temp = I915_READ(reg);
	if (HAS_PCH_CPT(dev)) {
		temp &= ~FDI_LINK_TRAIN_PATTERN_MASK_CPT;
		temp |= FDI_LINK_TRAIN_PATTERN_1_CPT;
	} else {
		temp &= ~FDI_LINK_TRAIN_NONE;
		temp |= FDI_LINK_TRAIN_PATTERN_1;
	}
	I915_WRITE(reg, temp | FDI_RX_ENABLE);

	POSTING_READ(reg);
	udelay(150);

	for (i = 0; i < 4; i++) {
		reg = FDI_TX_CTL(pipe);
		temp = I915_READ(reg);
		temp &= ~FDI_LINK_TRAIN_VOL_EMP_MASK;
		temp |= snb_b_fdi_train_param[i];
		I915_WRITE(reg, temp);

		POSTING_READ(reg);
		udelay(500);

		for (retry = 0; retry < 5; retry++) {
			reg = FDI_RX_IIR(pipe);
			temp = I915_READ(reg);
			DRM_DEBUG_KMS("FDI_RX_IIR 0x%x\n", temp);
			if (temp & FDI_RX_BIT_LOCK) {
				I915_WRITE(reg, temp | FDI_RX_BIT_LOCK);
				DRM_DEBUG_KMS("FDI train 1 done.\n");
				break;
			}
			udelay(50);
		}
		if (retry < 5)
			break;
	}
	if (i == 4)
		DRM_ERROR("FDI train 1 fail!\n");

	/* Train 2 */
	reg = FDI_TX_CTL(pipe);
	temp = I915_READ(reg);
	temp &= ~FDI_LINK_TRAIN_NONE;
	temp |= FDI_LINK_TRAIN_PATTERN_2;
	if (IS_GEN6(dev)) {
		temp &= ~FDI_LINK_TRAIN_VOL_EMP_MASK;
		/* SNB-B */
		temp |= FDI_LINK_TRAIN_400MV_0DB_SNB_B;
	}
	I915_WRITE(reg, temp);

	reg = FDI_RX_CTL(pipe);
	temp = I915_READ(reg);
	if (HAS_PCH_CPT(dev)) {
		temp &= ~FDI_LINK_TRAIN_PATTERN_MASK_CPT;
		temp |= FDI_LINK_TRAIN_PATTERN_2_CPT;
	} else {
		temp &= ~FDI_LINK_TRAIN_NONE;
		temp |= FDI_LINK_TRAIN_PATTERN_2;
	}
	I915_WRITE(reg, temp);

	POSTING_READ(reg);
	udelay(150);

	for (i = 0; i < 4; i++) {
		reg = FDI_TX_CTL(pipe);
		temp = I915_READ(reg);
		temp &= ~FDI_LINK_TRAIN_VOL_EMP_MASK;
		temp |= snb_b_fdi_train_param[i];
		I915_WRITE(reg, temp);

		POSTING_READ(reg);
		udelay(500);

		for (retry = 0; retry < 5; retry++) {
			reg = FDI_RX_IIR(pipe);
			temp = I915_READ(reg);
			DRM_DEBUG_KMS("FDI_RX_IIR 0x%x\n", temp);
			if (temp & FDI_RX_SYMBOL_LOCK) {
				I915_WRITE(reg, temp | FDI_RX_SYMBOL_LOCK);
				DRM_DEBUG_KMS("FDI train 2 done.\n");
				break;
			}
			udelay(50);
		}
		if (retry < 5)
			break;
	}
	if (i == 4)
		DRM_ERROR("FDI train 2 fail!\n");

	DRM_DEBUG_KMS("FDI train done.\n");
}

/* Manual link training for Ivy Bridge A0 parts */
static void ivb_manual_fdi_link_train(struct drm_crtc *crtc)
{
	struct drm_device *dev = crtc->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
	int pipe = intel_crtc->pipe;
	u32 reg, temp, i;

	/* Train 1: umask FDI RX Interrupt symbol_lock and bit_lock bit
	   for train result */
	reg = FDI_RX_IMR(pipe);
	temp = I915_READ(reg);
	temp &= ~FDI_RX_SYMBOL_LOCK;
	temp &= ~FDI_RX_BIT_LOCK;
	I915_WRITE(reg, temp);

	POSTING_READ(reg);
	udelay(150);

	DRM_DEBUG_KMS("FDI_RX_IIR before link train 0x%x\n",
		      I915_READ(FDI_RX_IIR(pipe)));

	/* enable CPU FDI TX and PCH FDI RX */
	reg = FDI_TX_CTL(pipe);
	temp = I915_READ(reg);
	temp &= ~(7 << 19);
	temp |= (intel_crtc->fdi_lanes - 1) << 19;
	temp &= ~(FDI_LINK_TRAIN_AUTO | FDI_LINK_TRAIN_NONE_IVB);
	temp |= FDI_LINK_TRAIN_PATTERN_1_IVB;
	temp &= ~FDI_LINK_TRAIN_VOL_EMP_MASK;
	temp |= FDI_LINK_TRAIN_400MV_0DB_SNB_B;
	temp |= FDI_COMPOSITE_SYNC;
	I915_WRITE(reg, temp | FDI_TX_ENABLE);

	I915_WRITE(FDI_RX_MISC(pipe),
		   FDI_RX_TP1_TO_TP2_48 | FDI_RX_FDI_DELAY_90);

	reg = FDI_RX_CTL(pipe);
	temp = I915_READ(reg);
	temp &= ~FDI_LINK_TRAIN_AUTO;
	temp &= ~FDI_LINK_TRAIN_PATTERN_MASK_CPT;
	temp |= FDI_LINK_TRAIN_PATTERN_1_CPT;
	temp |= FDI_COMPOSITE_SYNC;
	I915_WRITE(reg, temp | FDI_RX_ENABLE);

	POSTING_READ(reg);
	udelay(150);

	for (i = 0; i < 4; i++) {
		reg = FDI_TX_CTL(pipe);
		temp = I915_READ(reg);
		temp &= ~FDI_LINK_TRAIN_VOL_EMP_MASK;
		temp |= snb_b_fdi_train_param[i];
		I915_WRITE(reg, temp);

		POSTING_READ(reg);
		udelay(500);

		reg = FDI_RX_IIR(pipe);
		temp = I915_READ(reg);
		DRM_DEBUG_KMS("FDI_RX_IIR 0x%x\n", temp);

		if (temp & FDI_RX_BIT_LOCK ||
		    (I915_READ(reg) & FDI_RX_BIT_LOCK)) {
			I915_WRITE(reg, temp | FDI_RX_BIT_LOCK);
			DRM_DEBUG_KMS("FDI train 1 done, level %i.\n", i);
			break;
		}
	}
	if (i == 4)
		DRM_ERROR("FDI train 1 fail!\n");

	/* Train 2 */
	reg = FDI_TX_CTL(pipe);
	temp = I915_READ(reg);
	temp &= ~FDI_LINK_TRAIN_NONE_IVB;
	temp |= FDI_LINK_TRAIN_PATTERN_2_IVB;
	temp &= ~FDI_LINK_TRAIN_VOL_EMP_MASK;
	temp |= FDI_LINK_TRAIN_400MV_0DB_SNB_B;
	I915_WRITE(reg, temp);

	reg = FDI_RX_CTL(pipe);
	temp = I915_READ(reg);
	temp &= ~FDI_LINK_TRAIN_PATTERN_MASK_CPT;
	temp |= FDI_LINK_TRAIN_PATTERN_2_CPT;
	I915_WRITE(reg, temp);

	POSTING_READ(reg);
	udelay(150);

	for (i = 0; i < 4; i++) {
		reg = FDI_TX_CTL(pipe);
		temp = I915_READ(reg);
		temp &= ~FDI_LINK_TRAIN_VOL_EMP_MASK;
		temp |= snb_b_fdi_train_param[i];
		I915_WRITE(reg, temp);

		POSTING_READ(reg);
		udelay(500);

		reg = FDI_RX_IIR(pipe);
		temp = I915_READ(reg);
		DRM_DEBUG_KMS("FDI_RX_IIR 0x%x\n", temp);

		if (temp & FDI_RX_SYMBOL_LOCK) {
			I915_WRITE(reg, temp | FDI_RX_SYMBOL_LOCK);
			DRM_DEBUG_KMS("FDI train 2 done, level %i.\n", i);
			break;
		}
	}
	if (i == 4)
		DRM_ERROR("FDI train 2 fail!\n");

	DRM_DEBUG_KMS("FDI train done.\n");
}

static void ironlake_fdi_pll_enable(struct intel_crtc *intel_crtc)
{
	struct drm_device *dev = intel_crtc->base.dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	int pipe = intel_crtc->pipe;
	u32 reg, temp;


	/* enable PCH FDI RX PLL, wait warmup plus DMI latency */
	reg = FDI_RX_CTL(pipe);
	temp = I915_READ(reg);
	temp &= ~((0x7 << 19) | (0x7 << 16));
	temp |= (intel_crtc->fdi_lanes - 1) << 19;
	temp |= (I915_READ(PIPECONF(pipe)) & PIPECONF_BPC_MASK) << 11;
	I915_WRITE(reg, temp | FDI_RX_PLL_ENABLE);

	POSTING_READ(reg);
	udelay(200);

	/* Switch from Rawclk to PCDclk */
	temp = I915_READ(reg);
	I915_WRITE(reg, temp | FDI_PCDCLK);

	POSTING_READ(reg);
	udelay(200);

	/* Enable CPU FDI TX PLL, always on for Ironlake */
	reg = FDI_TX_CTL(pipe);
	temp = I915_READ(reg);
	if ((temp & FDI_TX_PLL_ENABLE) == 0) {
		I915_WRITE(reg, temp | FDI_TX_PLL_ENABLE);

		POSTING_READ(reg);
		udelay(100);
	}
}

static void ironlake_fdi_pll_disable(struct intel_crtc *intel_crtc)
{
	struct drm_device *dev = intel_crtc->base.dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	int pipe = intel_crtc->pipe;
	u32 reg, temp;

	/* Switch from PCDclk to Rawclk */
	reg = FDI_RX_CTL(pipe);
	temp = I915_READ(reg);
	I915_WRITE(reg, temp & ~FDI_PCDCLK);

	/* Disable CPU FDI TX PLL */
	reg = FDI_TX_CTL(pipe);
	temp = I915_READ(reg);
	I915_WRITE(reg, temp & ~FDI_TX_PLL_ENABLE);

	POSTING_READ(reg);
	udelay(100);

	reg = FDI_RX_CTL(pipe);
	temp = I915_READ(reg);
	I915_WRITE(reg, temp & ~FDI_RX_PLL_ENABLE);

	/* Wait for the clocks to turn off. */
	POSTING_READ(reg);
	udelay(100);
}

static void ironlake_fdi_disable(struct drm_crtc *crtc)
{
	struct drm_device *dev = crtc->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
	int pipe = intel_crtc->pipe;
	u32 reg, temp;

	/* disable CPU FDI tx and PCH FDI rx */
	reg = FDI_TX_CTL(pipe);
	temp = I915_READ(reg);
	I915_WRITE(reg, temp & ~FDI_TX_ENABLE);
	POSTING_READ(reg);

	reg = FDI_RX_CTL(pipe);
	temp = I915_READ(reg);
	temp &= ~(0x7 << 16);
	temp |= (I915_READ(PIPECONF(pipe)) & PIPECONF_BPC_MASK) << 11;
	I915_WRITE(reg, temp & ~FDI_RX_ENABLE);

	POSTING_READ(reg);
	udelay(100);

	/* Ironlake workaround, disable clock pointer after downing FDI */
	if (HAS_PCH_IBX(dev)) {
		I915_WRITE(FDI_RX_CHICKEN(pipe), FDI_RX_PHASE_SYNC_POINTER_OVR);
	}

	/* still set train pattern 1 */
	reg = FDI_TX_CTL(pipe);
	temp = I915_READ(reg);
	temp &= ~FDI_LINK_TRAIN_NONE;
	temp |= FDI_LINK_TRAIN_PATTERN_1;
	I915_WRITE(reg, temp);

	reg = FDI_RX_CTL(pipe);
	temp = I915_READ(reg);
	if (HAS_PCH_CPT(dev)) {
		temp &= ~FDI_LINK_TRAIN_PATTERN_MASK_CPT;
		temp |= FDI_LINK_TRAIN_PATTERN_1_CPT;
	} else {
		temp &= ~FDI_LINK_TRAIN_NONE;
		temp |= FDI_LINK_TRAIN_PATTERN_1;
	}
	/* BPC in FDI rx is consistent with that in PIPECONF */
	temp &= ~(0x07 << 16);
	temp |= (I915_READ(PIPECONF(pipe)) & PIPECONF_BPC_MASK) << 11;
	I915_WRITE(reg, temp);

	POSTING_READ(reg);
	udelay(100);
}

static bool intel_crtc_has_pending_flip(struct drm_crtc *crtc)
{
	struct drm_device *dev = crtc->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
	unsigned long flags;
	bool pending;

	if (i915_reset_in_progress(&dev_priv->gpu_error) ||
	    intel_crtc->reset_counter != atomic_read(&dev_priv->gpu_error.reset_counter))
		return false;

	spin_lock_irqsave(&dev->event_lock, flags);
	pending = to_intel_crtc(crtc)->unpin_work != NULL;
	spin_unlock_irqrestore(&dev->event_lock, flags);

	return pending;
}

static void intel_crtc_wait_for_pending_flips(struct drm_crtc *crtc)
{
	struct drm_device *dev = crtc->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;

	if (crtc->fb == NULL)
		return;

	WARN_ON(waitqueue_active(&dev_priv->pending_flip_queue));

	wait_event(dev_priv->pending_flip_queue,
		   !intel_crtc_has_pending_flip(crtc));

	mutex_lock(&dev->struct_mutex);
	intel_finish_fb(crtc->fb);
	mutex_unlock(&dev->struct_mutex);
}

static bool ironlake_crtc_driving_pch(struct drm_crtc *crtc)
{
	struct drm_device *dev = crtc->dev;
	struct intel_encoder *intel_encoder;

	/*
	 * If there's a non-PCH eDP on this crtc, it must be DP_A, and that
	 * must be driven by its own crtc; no sharing is possible.
	 */
	for_each_encoder_on_crtc(dev, crtc, intel_encoder) {
		switch (intel_encoder->type) {
		case INTEL_OUTPUT_EDP:
			if (!intel_encoder_is_pch_edp(&intel_encoder->base))
				return false;
			continue;
		}
	}

	return true;
}

static bool haswell_crtc_driving_pch(struct drm_crtc *crtc)
{
	return intel_pipe_has_type(crtc, INTEL_OUTPUT_ANALOG);
}

/* Program iCLKIP clock to the desired frequency */
static void lpt_program_iclkip(struct drm_crtc *crtc)
{
	struct drm_device *dev = crtc->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	u32 divsel, phaseinc, auxdiv, phasedir = 0;
	u32 temp;

	mutex_lock(&dev_priv->dpio_lock);

	/* It is necessary to ungate the pixclk gate prior to programming
	 * the divisors, and gate it back when it is done.
	 */
	I915_WRITE(PIXCLK_GATE, PIXCLK_GATE_GATE);

	/* Disable SSCCTL */
	intel_sbi_write(dev_priv, SBI_SSCCTL6,
			intel_sbi_read(dev_priv, SBI_SSCCTL6, SBI_ICLK) |
				SBI_SSCCTL_DISABLE,
			SBI_ICLK);

	/* 20MHz is a corner case which is out of range for the 7-bit divisor */
	if (crtc->mode.clock == 20000) {
		auxdiv = 1;
		divsel = 0x41;
		phaseinc = 0x20;
	} else {
		/* The iCLK virtual clock root frequency is in MHz,
		 * but the crtc->mode.clock in in KHz. To get the divisors,
		 * it is necessary to divide one by another, so we
		 * convert the virtual clock precision to KHz here for higher
		 * precision.
		 */
		u32 iclk_virtual_root_freq = 172800 * 1000;
		u32 iclk_pi_range = 64;
		u32 desired_divisor, msb_divisor_value, pi_value;

		desired_divisor = (iclk_virtual_root_freq / crtc->mode.clock);
		msb_divisor_value = desired_divisor / iclk_pi_range;
		pi_value = desired_divisor % iclk_pi_range;

		auxdiv = 0;
		divsel = msb_divisor_value - 2;
		phaseinc = pi_value;
	}

	/* This should not happen with any sane values */
	WARN_ON(SBI_SSCDIVINTPHASE_DIVSEL(divsel) &
		~SBI_SSCDIVINTPHASE_DIVSEL_MASK);
	WARN_ON(SBI_SSCDIVINTPHASE_DIR(phasedir) &
		~SBI_SSCDIVINTPHASE_INCVAL_MASK);

	DRM_DEBUG_KMS("iCLKIP clock: found settings for %dKHz refresh rate: auxdiv=%x, divsel=%x, phasedir=%x, phaseinc=%x\n",
			crtc->mode.clock,
			auxdiv,
			divsel,
			phasedir,
			phaseinc);

	/* Program SSCDIVINTPHASE6 */
	temp = intel_sbi_read(dev_priv, SBI_SSCDIVINTPHASE6, SBI_ICLK);
	temp &= ~SBI_SSCDIVINTPHASE_DIVSEL_MASK;
	temp |= SBI_SSCDIVINTPHASE_DIVSEL(divsel);
	temp &= ~SBI_SSCDIVINTPHASE_INCVAL_MASK;
	temp |= SBI_SSCDIVINTPHASE_INCVAL(phaseinc);
	temp |= SBI_SSCDIVINTPHASE_DIR(phasedir);
	temp |= SBI_SSCDIVINTPHASE_PROPAGATE;
	intel_sbi_write(dev_priv, SBI_SSCDIVINTPHASE6, temp, SBI_ICLK);

	/* Program SSCAUXDIV */
	temp = intel_sbi_read(dev_priv, SBI_SSCAUXDIV6, SBI_ICLK);
	temp &= ~SBI_SSCAUXDIV_FINALDIV2SEL(1);
	temp |= SBI_SSCAUXDIV_FINALDIV2SEL(auxdiv);
	intel_sbi_write(dev_priv, SBI_SSCAUXDIV6, temp, SBI_ICLK);

	/* Enable modulator and associated divider */
	temp = intel_sbi_read(dev_priv, SBI_SSCCTL6, SBI_ICLK);
	temp &= ~SBI_SSCCTL_DISABLE;
	intel_sbi_write(dev_priv, SBI_SSCCTL6, temp, SBI_ICLK);

	/* Wait for initialization time */
	udelay(24);

	I915_WRITE(PIXCLK_GATE, PIXCLK_GATE_UNGATE);

	mutex_unlock(&dev_priv->dpio_lock);
}

/*
 * Enable PCH resources required for PCH ports:
 *   - PCH PLLs
 *   - FDI training & RX/TX
 *   - update transcoder timings
 *   - DP transcoding bits
 *   - transcoder
 */
static void ironlake_pch_enable(struct drm_crtc *crtc)
{
	struct drm_device *dev = crtc->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
	int pipe = intel_crtc->pipe;
	u32 reg, temp;

	assert_transcoder_disabled(dev_priv, pipe);

	/* Write the TU size bits before fdi link training, so that error
	 * detection works. */
	I915_WRITE(FDI_RX_TUSIZE1(pipe),
		   I915_READ(PIPE_DATA_M1(pipe)) & TU_SIZE_MASK);

	/* For PCH output, training FDI link */
	dev_priv->display.fdi_link_train(crtc);

	/* XXX: pch pll's can be enabled any time before we enable the PCH
	 * transcoder, and we actually should do this to not upset any PCH
	 * transcoder that already use the clock when we share it.
	 *
	 * Note that enable_pch_pll tries to do the right thing, but get_pch_pll
	 * unconditionally resets the pll - we need that to have the right LVDS
	 * enable sequence. */
	ironlake_enable_pch_pll(intel_crtc);

	if (HAS_PCH_CPT(dev)) {
		u32 sel;

		temp = I915_READ(PCH_DPLL_SEL);
		switch (pipe) {
		default:
		case 0:
			temp |= TRANSA_DPLL_ENABLE;
			sel = TRANSA_DPLLB_SEL;
			break;
		case 1:
			temp |= TRANSB_DPLL_ENABLE;
			sel = TRANSB_DPLLB_SEL;
			break;
		case 2:
			temp |= TRANSC_DPLL_ENABLE;
			sel = TRANSC_DPLLB_SEL;
			break;
		}
		if (intel_crtc->pch_pll->pll_reg == _PCH_DPLL_B)
			temp |= sel;
		else
			temp &= ~sel;
		I915_WRITE(PCH_DPLL_SEL, temp);
	}

	/* set transcoder timing, panel must allow it */
	assert_panel_unlocked(dev_priv, pipe);
	I915_WRITE(TRANS_HTOTAL(pipe), I915_READ(HTOTAL(pipe)));
	I915_WRITE(TRANS_HBLANK(pipe), I915_READ(HBLANK(pipe)));
	I915_WRITE(TRANS_HSYNC(pipe),  I915_READ(HSYNC(pipe)));

	I915_WRITE(TRANS_VTOTAL(pipe), I915_READ(VTOTAL(pipe)));
	I915_WRITE(TRANS_VBLANK(pipe), I915_READ(VBLANK(pipe)));
	I915_WRITE(TRANS_VSYNC(pipe),  I915_READ(VSYNC(pipe)));
	I915_WRITE(TRANS_VSYNCSHIFT(pipe),  I915_READ(VSYNCSHIFT(pipe)));

	intel_fdi_normal_train(crtc);

	/* For PCH DP, enable TRANS_DP_CTL */
	if (HAS_PCH_CPT(dev) &&
	    (intel_pipe_has_type(crtc, INTEL_OUTPUT_DISPLAYPORT) ||
	     intel_pipe_has_type(crtc, INTEL_OUTPUT_EDP))) {
		u32 bpc = (I915_READ(PIPECONF(pipe)) & PIPECONF_BPC_MASK) >> 5;
		reg = TRANS_DP_CTL(pipe);
		temp = I915_READ(reg);
		temp &= ~(TRANS_DP_PORT_SEL_MASK |
			  TRANS_DP_SYNC_MASK |
			  TRANS_DP_BPC_MASK);
		temp |= (TRANS_DP_OUTPUT_ENABLE |
			 TRANS_DP_ENH_FRAMING);
		temp |= bpc << 9; /* same format but at 11:9 */

		if (crtc->mode.flags & DRM_MODE_FLAG_PHSYNC)
			temp |= TRANS_DP_HSYNC_ACTIVE_HIGH;
		if (crtc->mode.flags & DRM_MODE_FLAG_PVSYNC)
			temp |= TRANS_DP_VSYNC_ACTIVE_HIGH;

		switch (intel_trans_dp_port_sel(crtc)) {
		case PCH_DP_B:
			temp |= TRANS_DP_PORT_SEL_B;
			break;
		case PCH_DP_C:
			temp |= TRANS_DP_PORT_SEL_C;
			break;
		case PCH_DP_D:
			temp |= TRANS_DP_PORT_SEL_D;
			break;
		default:
			BUG();
		}

		I915_WRITE(reg, temp);
	}

	ironlake_enable_pch_transcoder(dev_priv, pipe);
}

static void lpt_pch_enable(struct drm_crtc *crtc)
{
	struct drm_device *dev = crtc->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
	enum transcoder cpu_transcoder = intel_crtc->cpu_transcoder;

	assert_transcoder_disabled(dev_priv, TRANSCODER_A);

	lpt_program_iclkip(crtc);

	/* Set transcoder timing. */
	I915_WRITE(_TRANS_HTOTAL_A, I915_READ(HTOTAL(cpu_transcoder)));
	I915_WRITE(_TRANS_HBLANK_A, I915_READ(HBLANK(cpu_transcoder)));
	I915_WRITE(_TRANS_HSYNC_A,  I915_READ(HSYNC(cpu_transcoder)));

	I915_WRITE(_TRANS_VTOTAL_A, I915_READ(VTOTAL(cpu_transcoder)));
	I915_WRITE(_TRANS_VBLANK_A, I915_READ(VBLANK(cpu_transcoder)));
	I915_WRITE(_TRANS_VSYNC_A,  I915_READ(VSYNC(cpu_transcoder)));
	I915_WRITE(_TRANS_VSYNCSHIFT_A, I915_READ(VSYNCSHIFT(cpu_transcoder)));

	lpt_enable_pch_transcoder(dev_priv, cpu_transcoder);
}

static void intel_put_pch_pll(struct intel_crtc *intel_crtc)
{
	struct intel_pch_pll *pll = intel_crtc->pch_pll;

	if (pll == NULL)
		return;

	if (pll->refcount == 0) {
		WARN(1, "bad PCH PLL refcount\n");
		return;
	}

	--pll->refcount;
	intel_crtc->pch_pll = NULL;
}

static struct intel_pch_pll *intel_get_pch_pll(struct intel_crtc *intel_crtc, u32 dpll, u32 fp)
{
	struct drm_i915_private *dev_priv = intel_crtc->base.dev->dev_private;
	struct intel_pch_pll *pll;
	int i;

	pll = intel_crtc->pch_pll;
	if (pll) {
		DRM_DEBUG_KMS("CRTC:%d reusing existing PCH PLL %x\n",
			      intel_crtc->base.base.id, pll->pll_reg);
		goto prepare;
	}

	if (HAS_PCH_IBX(dev_priv->dev)) {
		/* Ironlake PCH has a fixed PLL->PCH pipe mapping. */
		i = intel_crtc->pipe;
		pll = &dev_priv->pch_plls[i];

		DRM_DEBUG_KMS("CRTC:%d using pre-allocated PCH PLL %x\n",
			      intel_crtc->base.base.id, pll->pll_reg);

		goto found;
	}

	for (i = 0; i < dev_priv->num_pch_pll; i++) {
		pll = &dev_priv->pch_plls[i];

		/* Only want to check enabled timings first */
		if (pll->refcount == 0)
			continue;

		if (dpll == (I915_READ(pll->pll_reg) & 0x7fffffff) &&
		    fp == I915_READ(pll->fp0_reg)) {
			DRM_DEBUG_KMS("CRTC:%d sharing existing PCH PLL %x (refcount %d, ative %d)\n",
				      intel_crtc->base.base.id,
				      pll->pll_reg, pll->refcount, pll->active);

			goto found;
		}
	}

	/* Ok no matching timings, maybe there's a free one? */
	for (i = 0; i < dev_priv->num_pch_pll; i++) {
		pll = &dev_priv->pch_plls[i];
		if (pll->refcount == 0) {
			DRM_DEBUG_KMS("CRTC:%d allocated PCH PLL %x\n",
				      intel_crtc->base.base.id, pll->pll_reg);
			goto found;
		}
	}

	return NULL;

found:
	intel_crtc->pch_pll = pll;
	pll->refcount++;
	DRM_DEBUG_DRIVER("using pll %d for pipe %d\n", i, intel_crtc->pipe);
prepare: /* separate function? */
	DRM_DEBUG_DRIVER("switching PLL %x off\n", pll->pll_reg);

	/* Wait for the clocks to stabilize before rewriting the regs */
	I915_WRITE(pll->pll_reg, dpll & ~DPLL_VCO_ENABLE);
	POSTING_READ(pll->pll_reg);
	udelay(150);

	I915_WRITE(pll->fp0_reg, fp);
	I915_WRITE(pll->pll_reg, dpll & ~DPLL_VCO_ENABLE);
	pll->on = false;
	return pll;
}

void intel_cpt_verify_modeset(struct drm_device *dev, int pipe)
{
	struct drm_i915_private *dev_priv = dev->dev_private;
	int dslreg = PIPEDSL(pipe);
	u32 temp;

	temp = I915_READ(dslreg);
	udelay(500);
	if (wait_for(I915_READ(dslreg) != temp, 5)) {
		if (wait_for(I915_READ(dslreg) != temp, 5))
			DRM_ERROR("mode set failed: pipe %d stuck\n", pipe);
	}
}

static void ironlake_crtc_enable(struct drm_crtc *crtc)
{
	struct drm_device *dev = crtc->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
	struct intel_encoder *encoder;
	int pipe = intel_crtc->pipe;
	int plane = intel_crtc->plane;
	u32 temp;
	bool is_pch_port;

	WARN_ON(!crtc->enabled);

	if (intel_crtc->active)
		return;

	intel_crtc->active = true;
	intel_update_watermarks(dev);

	if (intel_pipe_has_type(crtc, INTEL_OUTPUT_LVDS)) {
		temp = I915_READ(PCH_LVDS);
		if ((temp & LVDS_PORT_EN) == 0)
			I915_WRITE(PCH_LVDS, temp | LVDS_PORT_EN);
	}

	is_pch_port = ironlake_crtc_driving_pch(crtc);

	if (is_pch_port) {
		/* Note: FDI PLL enabling _must_ be done before we enable the
		 * cpu pipes, hence this is separate from all the other fdi/pch
		 * enabling. */
		ironlake_fdi_pll_enable(intel_crtc);
	} else {
		assert_fdi_tx_disabled(dev_priv, pipe);
		assert_fdi_rx_disabled(dev_priv, pipe);
	}

	for_each_encoder_on_crtc(dev, crtc, encoder)
		if (encoder->pre_enable)
			encoder->pre_enable(encoder);

	/* Enable panel fitting for LVDS */
	if (dev_priv->pch_pf_size &&
	    (intel_pipe_has_type(crtc, INTEL_OUTPUT_LVDS) ||
	     intel_pipe_has_type(crtc, INTEL_OUTPUT_EDP))) {
		/* Force use of hard-coded filter coefficients
		 * as some pre-programmed values are broken,
		 * e.g. x201.
		 */
		if (IS_IVYBRIDGE(dev))
			I915_WRITE(PF_CTL(pipe), PF_ENABLE | PF_FILTER_MED_3x3 |
						 PF_PIPE_SEL_IVB(pipe));
		else
			I915_WRITE(PF_CTL(pipe), PF_ENABLE | PF_FILTER_MED_3x3);
		I915_WRITE(PF_WIN_POS(pipe), dev_priv->pch_pf_pos);
		I915_WRITE(PF_WIN_SZ(pipe), dev_priv->pch_pf_size);
	}

	/*
	 * On ILK+ LUT must be loaded before the pipe is running but with
	 * clocks enabled
	 */
	intel_crtc_load_lut(crtc);

	intel_enable_pipe(dev_priv, pipe, is_pch_port);
	intel_enable_plane(dev_priv, plane, pipe);

	if (is_pch_port)
		ironlake_pch_enable(crtc);

	mutex_lock(&dev->struct_mutex);
	intel_update_fbc(dev);
	mutex_unlock(&dev->struct_mutex);

	intel_crtc_update_cursor(crtc, true);

	for_each_encoder_on_crtc(dev, crtc, encoder)
		encoder->enable(encoder);

	if (HAS_PCH_CPT(dev))
		intel_cpt_verify_modeset(dev, intel_crtc->pipe);

	/*
	 * There seems to be a race in PCH platform hw (at least on some
	 * outputs) where an enabled pipe still completes any pageflip right
	 * away (as if the pipe is off) instead of waiting for vblank. As soon
	 * as the first vblank happend, everything works as expected. Hence just
	 * wait for one vblank before returning to avoid strange things
	 * happening.
	 */
	intel_wait_for_vblank(dev, intel_crtc->pipe);
}

static void haswell_crtc_enable(struct drm_crtc *crtc)
{
	struct drm_device *dev = crtc->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
	struct intel_encoder *encoder;
	int pipe = intel_crtc->pipe;
	int plane = intel_crtc->plane;
	bool is_pch_port;

	WARN_ON(!crtc->enabled);

	if (intel_crtc->active)
		return;

	intel_crtc->active = true;
	intel_update_watermarks(dev);

	is_pch_port = haswell_crtc_driving_pch(crtc);

	if (is_pch_port)
		dev_priv->display.fdi_link_train(crtc);

	for_each_encoder_on_crtc(dev, crtc, encoder)
		if (encoder->pre_enable)
			encoder->pre_enable(encoder);

	intel_ddi_enable_pipe_clock(intel_crtc);

	/* Enable panel fitting for eDP */
	if (dev_priv->pch_pf_size &&
	    intel_pipe_has_type(crtc, INTEL_OUTPUT_EDP)) {
		/* Force use of hard-coded filter coefficients
		 * as some pre-programmed values are broken,
		 * e.g. x201.
		 */
		I915_WRITE(PF_CTL(pipe), PF_ENABLE | PF_FILTER_MED_3x3 |
					 PF_PIPE_SEL_IVB(pipe));
		I915_WRITE(PF_WIN_POS(pipe), dev_priv->pch_pf_pos);
		I915_WRITE(PF_WIN_SZ(pipe), dev_priv->pch_pf_size);
	}

	/*
	 * On ILK+ LUT must be loaded before the pipe is running but with
	 * clocks enabled
	 */
	intel_crtc_load_lut(crtc);

	intel_ddi_set_pipe_settings(crtc);
	intel_ddi_enable_pipe_func(crtc);

	intel_enable_pipe(dev_priv, pipe, is_pch_port);
	intel_enable_plane(dev_priv, plane, pipe);

	if (is_pch_port)
		lpt_pch_enable(crtc);

	mutex_lock(&dev->struct_mutex);
	intel_update_fbc(dev);
	mutex_unlock(&dev->struct_mutex);

	intel_crtc_update_cursor(crtc, true);

	for_each_encoder_on_crtc(dev, crtc, encoder)
		encoder->enable(encoder);

	/*
	 * There seems to be a race in PCH platform hw (at least on some
	 * outputs) where an enabled pipe still completes any pageflip right
	 * away (as if the pipe is off) instead of waiting for vblank. As soon
	 * as the first vblank happend, everything works as expected. Hence just
	 * wait for one vblank before returning to avoid strange things
	 * happening.
	 */
	intel_wait_for_vblank(dev, intel_crtc->pipe);
}

static void ironlake_crtc_disable(struct drm_crtc *crtc)
{
	struct drm_device *dev = crtc->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
	struct intel_encoder *encoder;
	int pipe = intel_crtc->pipe;
	int plane = intel_crtc->plane;
	u32 reg, temp;


	if (!intel_crtc->active)
		return;

	for_each_encoder_on_crtc(dev, crtc, encoder)
		encoder->disable(encoder);

	intel_crtc_wait_for_pending_flips(crtc);
	drm_vblank_off(dev, pipe);
	intel_crtc_update_cursor(crtc, false);

	intel_disable_plane(dev_priv, plane, pipe);

	if (dev_priv->cfb_plane == plane)
		intel_disable_fbc(dev);

	intel_disable_pipe(dev_priv, pipe);

	/* Disable PF */
	I915_WRITE(PF_CTL(pipe), 0);
	I915_WRITE(PF_WIN_SZ(pipe), 0);

	for_each_encoder_on_crtc(dev, crtc, encoder)
		if (encoder->post_disable)
			encoder->post_disable(encoder);

	ironlake_fdi_disable(crtc);

	ironlake_disable_pch_transcoder(dev_priv, pipe);

	if (HAS_PCH_CPT(dev)) {
		/* disable TRANS_DP_CTL */
		reg = TRANS_DP_CTL(pipe);
		temp = I915_READ(reg);
		temp &= ~(TRANS_DP_OUTPUT_ENABLE | TRANS_DP_PORT_SEL_MASK);
		temp |= TRANS_DP_PORT_SEL_NONE;
		I915_WRITE(reg, temp);

		/* disable DPLL_SEL */
		temp = I915_READ(PCH_DPLL_SEL);
		switch (pipe) {
		case 0:
			temp &= ~(TRANSA_DPLL_ENABLE | TRANSA_DPLLB_SEL);
			break;
		case 1:
			temp &= ~(TRANSB_DPLL_ENABLE | TRANSB_DPLLB_SEL);
			break;
		case 2:
			/* C shares PLL A or B */
			temp &= ~(TRANSC_DPLL_ENABLE | TRANSC_DPLLB_SEL);
			break;
		default:
			BUG(); /* wtf */
		}
		I915_WRITE(PCH_DPLL_SEL, temp);
	}

	/* disable PCH DPLL */
	intel_disable_pch_pll(intel_crtc);

	ironlake_fdi_pll_disable(intel_crtc);

	intel_crtc->active = false;
	intel_update_watermarks(dev);

	mutex_lock(&dev->struct_mutex);
	intel_update_fbc(dev);
	mutex_unlock(&dev->struct_mutex);
}

static void haswell_crtc_disable(struct drm_crtc *crtc)
{
	struct drm_device *dev = crtc->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
	struct intel_encoder *encoder;
	int pipe = intel_crtc->pipe;
	int plane = intel_crtc->plane;
	enum transcoder cpu_transcoder = intel_crtc->cpu_transcoder;
	bool is_pch_port;

	if (!intel_crtc->active)
		return;

	is_pch_port = haswell_crtc_driving_pch(crtc);

	for_each_encoder_on_crtc(dev, crtc, encoder)
		encoder->disable(encoder);

	intel_crtc_wait_for_pending_flips(crtc);
	drm_vblank_off(dev, pipe);
	intel_crtc_update_cursor(crtc, false);

	intel_disable_plane(dev_priv, plane, pipe);

	if (dev_priv->cfb_plane == plane)
		intel_disable_fbc(dev);

	intel_disable_pipe(dev_priv, pipe);

	intel_ddi_disable_transcoder_func(dev_priv, cpu_transcoder);

	/* Disable PF */
	I915_WRITE(PF_CTL(pipe), 0);
	I915_WRITE(PF_WIN_SZ(pipe), 0);

	intel_ddi_disable_pipe_clock(intel_crtc);

	for_each_encoder_on_crtc(dev, crtc, encoder)
		if (encoder->post_disable)
			encoder->post_disable(encoder);

	if (is_pch_port) {
		lpt_disable_pch_transcoder(dev_priv);
		intel_ddi_fdi_disable(crtc);
	}

	intel_crtc->active = false;
	intel_update_watermarks(dev);

	mutex_lock(&dev->struct_mutex);
	intel_update_fbc(dev);
	mutex_unlock(&dev->struct_mutex);
}

static void ironlake_crtc_off(struct drm_crtc *crtc)
{
	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
	intel_put_pch_pll(intel_crtc);
}

static void haswell_crtc_off(struct drm_crtc *crtc)
{
	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);

	/* Stop saying we're using TRANSCODER_EDP because some other CRTC might
	 * start using it. */
	intel_crtc->cpu_transcoder = (enum transcoder) intel_crtc->pipe;

	intel_ddi_put_crtc_pll(crtc);
}

static void intel_crtc_dpms_overlay(struct intel_crtc *intel_crtc, bool enable)
{
	if (!enable && intel_crtc->overlay) {
		struct drm_device *dev = intel_crtc->base.dev;
		struct drm_i915_private *dev_priv = dev->dev_private;

		mutex_lock(&dev->struct_mutex);
		dev_priv->mm.interruptible = false;
		(void) intel_overlay_switch_off(intel_crtc->overlay);
		dev_priv->mm.interruptible = true;
		mutex_unlock(&dev->struct_mutex);
	}

	/* Let userspace switch the overlay on again. In most cases userspace
	 * has to recompute where to put it anyway.
	 */
}

static void i9xx_crtc_enable(struct drm_crtc *crtc)
{
	struct drm_device *dev = crtc->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
	struct intel_encoder *encoder;
	int pipe = intel_crtc->pipe;
	int plane = intel_crtc->plane;

	WARN_ON(!crtc->enabled);

	if (intel_crtc->active)
		return;

	intel_crtc->active = true;
	intel_update_watermarks(dev);

	intel_enable_pll(dev_priv, pipe);

	for_each_encoder_on_crtc(dev, crtc, encoder)
		if (encoder->pre_enable)
			encoder->pre_enable(encoder);

	intel_enable_pipe(dev_priv, pipe, false);
	intel_enable_plane(dev_priv, plane, pipe);

	intel_crtc_load_lut(crtc);
	intel_update_fbc(dev);

	/* Give the overlay scaler a chance to enable if it's on this pipe */
	intel_crtc_dpms_overlay(intel_crtc, true);
	intel_crtc_update_cursor(crtc, true);

	for_each_encoder_on_crtc(dev, crtc, encoder)
		encoder->enable(encoder);
}

static void i9xx_crtc_disable(struct drm_crtc *crtc)
{
	struct drm_device *dev = crtc->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
	struct intel_encoder *encoder;
	int pipe = intel_crtc->pipe;
	int plane = intel_crtc->plane;
	u32 pctl;


	if (!intel_crtc->active)
		return;

	for_each_encoder_on_crtc(dev, crtc, encoder)
		encoder->disable(encoder);

	/* Give the overlay scaler a chance to disable if it's on this pipe */
	intel_crtc_wait_for_pending_flips(crtc);
	drm_vblank_off(dev, pipe);
	intel_crtc_dpms_overlay(intel_crtc, false);
	intel_crtc_update_cursor(crtc, false);

	if (dev_priv->cfb_plane == plane)
		intel_disable_fbc(dev);

	intel_disable_plane(dev_priv, plane, pipe);
	intel_disable_pipe(dev_priv, pipe);

	/* Disable pannel fitter if it is on this pipe. */
	pctl = I915_READ(PFIT_CONTROL);
	if ((pctl & PFIT_ENABLE) &&
	    ((pctl & PFIT_PIPE_MASK) >> PFIT_PIPE_SHIFT) == pipe)
		I915_WRITE(PFIT_CONTROL, 0);

	intel_disable_pll(dev_priv, pipe);

	intel_crtc->active = false;
	intel_update_fbc(dev);
	intel_update_watermarks(dev);
}

static void i9xx_crtc_off(struct drm_crtc *crtc)
{
}

static void intel_crtc_update_sarea(struct drm_crtc *crtc,
				    bool enabled)
{
	struct drm_device *dev = crtc->dev;
	struct drm_i915_master_private *master_priv;
	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
	int pipe = intel_crtc->pipe;

	if (!dev->primary->master)
		return;

	master_priv = dev->primary->master->driver_priv;
	if (!master_priv->sarea_priv)
		return;

	switch (pipe) {
	case 0:
		master_priv->sarea_priv->pipeA_w = enabled ? crtc->mode.hdisplay : 0;
		master_priv->sarea_priv->pipeA_h = enabled ? crtc->mode.vdisplay : 0;
		break;
	case 1:
		master_priv->sarea_priv->pipeB_w = enabled ? crtc->mode.hdisplay : 0;
		master_priv->sarea_priv->pipeB_h = enabled ? crtc->mode.vdisplay : 0;
		break;
	default:
		DRM_ERROR("Can't update pipe %c in SAREA\n", pipe_name(pipe));
		break;
	}
}

/**
 * Sets the power management mode of the pipe and plane.
 */
void intel_crtc_update_dpms(struct drm_crtc *crtc)
{
	struct drm_device *dev = crtc->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_encoder *intel_encoder;
	bool enable = false;

	for_each_encoder_on_crtc(dev, crtc, intel_encoder)
		enable |= intel_encoder->connectors_active;

	if (enable)
		dev_priv->display.crtc_enable(crtc);
	else
		dev_priv->display.crtc_disable(crtc);

	intel_crtc_update_sarea(crtc, enable);
}

static void intel_crtc_noop(struct drm_crtc *crtc)
{
}

static void intel_crtc_disable(struct drm_crtc *crtc)
{
	struct drm_device *dev = crtc->dev;
	struct drm_connector *connector;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);

	/* crtc should still be enabled when we disable it. */
	WARN_ON(!crtc->enabled);

	intel_crtc->eld_vld = false;
	dev_priv->display.crtc_disable(crtc);
	intel_crtc_update_sarea(crtc, false);
	dev_priv->display.off(crtc);

	assert_plane_disabled(dev->dev_private, to_intel_crtc(crtc)->plane);
	assert_pipe_disabled(dev->dev_private, to_intel_crtc(crtc)->pipe);

	if (crtc->fb) {
		mutex_lock(&dev->struct_mutex);
		intel_unpin_fb_obj(to_intel_framebuffer(crtc->fb)->obj);
		mutex_unlock(&dev->struct_mutex);
		crtc->fb = NULL;
	}

	/* Update computed state. */
	list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
		if (!connector->encoder || !connector->encoder->crtc)
			continue;

		if (connector->encoder->crtc != crtc)
			continue;

		connector->dpms = DRM_MODE_DPMS_OFF;
		to_intel_encoder(connector->encoder)->connectors_active = false;
	}
}

void intel_modeset_disable(struct drm_device *dev)
{
	struct drm_crtc *crtc;

	list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
		if (crtc->enabled)
			intel_crtc_disable(crtc);
	}
}

void intel_encoder_noop(struct drm_encoder *encoder)
{
}

void intel_encoder_destroy(struct drm_encoder *encoder)
{
	struct intel_encoder *intel_encoder = to_intel_encoder(encoder);

	drm_encoder_cleanup(encoder);
	kfree(intel_encoder);
}

/* Simple dpms helper for encodres with just one connector, no cloning and only
 * one kind of off state. It clamps all !ON modes to fully OFF and changes the
 * state of the entire output pipe. */
void intel_encoder_dpms(struct intel_encoder *encoder, int mode)
{
	if (mode == DRM_MODE_DPMS_ON) {
		encoder->connectors_active = true;

		intel_crtc_update_dpms(encoder->base.crtc);
	} else {
		encoder->connectors_active = false;

		intel_crtc_update_dpms(encoder->base.crtc);
	}
}

/* Cross check the actual hw state with our own modeset state tracking (and it's
 * internal consistency). */
static void intel_connector_check_state(struct intel_connector *connector)
{
	if (connector->get_hw_state(connector)) {
		struct intel_encoder *encoder = connector->encoder;
		struct drm_crtc *crtc;
		bool encoder_enabled;
		enum pipe pipe;

		DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n",
			      connector->base.base.id,
			      drm_get_connector_name(&connector->base));

		WARN(connector->base.dpms == DRM_MODE_DPMS_OFF,
		     "wrong connector dpms state\n");
		WARN(connector->base.encoder != &encoder->base,
		     "active connector not linked to encoder\n");
		WARN(!encoder->connectors_active,
		     "encoder->connectors_active not set\n");

		encoder_enabled = encoder->get_hw_state(encoder, &pipe);
		WARN(!encoder_enabled, "encoder not enabled\n");
		if (WARN_ON(!encoder->base.crtc))
			return;

		crtc = encoder->base.crtc;

		WARN(!crtc->enabled, "crtc not enabled\n");
		WARN(!to_intel_crtc(crtc)->active, "crtc not active\n");
		WARN(pipe != to_intel_crtc(crtc)->pipe,
		     "encoder active on the wrong pipe\n");
	}
}

/* Even simpler default implementation, if there's really no special case to
 * consider. */
void intel_connector_dpms(struct drm_connector *connector, int mode)
{
	struct intel_encoder *encoder = intel_attached_encoder(connector);

	/* All the simple cases only support two dpms states. */
	if (mode != DRM_MODE_DPMS_ON)
		mode = DRM_MODE_DPMS_OFF;

	if (mode == connector->dpms)
		return;

	connector->dpms = mode;

	/* Only need to change hw state when actually enabled */
	if (encoder->base.crtc)
		intel_encoder_dpms(encoder, mode);
	else
		WARN_ON(encoder->connectors_active != false);

	intel_modeset_check_state(connector->dev);
}

/* Simple connector->get_hw_state implementation for encoders that support only
 * one connector and no cloning and hence the encoder state determines the state
 * of the connector. */
bool intel_connector_get_hw_state(struct intel_connector *connector)
{
	enum pipe pipe = 0;
	struct intel_encoder *encoder = connector->encoder;

	return encoder->get_hw_state(encoder, &pipe);
}

static bool intel_crtc_mode_fixup(struct drm_crtc *crtc,
				  const struct drm_display_mode *mode,
				  struct drm_display_mode *adjusted_mode)
{
	struct drm_device *dev = crtc->dev;

	if (HAS_PCH_SPLIT(dev)) {
		/* FDI link clock is fixed at 2.7G */
		if (mode->clock * 3 > IRONLAKE_FDI_FREQ * 4)
			return false;
	}

	/* All interlaced capable intel hw wants timings in frames. Note though
	 * that intel_lvds_mode_fixup does some funny tricks with the crtc
	 * timings, so we need to be careful not to clobber these.*/
	if (!(adjusted_mode->private_flags & INTEL_MODE_CRTC_TIMINGS_SET))
		drm_mode_set_crtcinfo(adjusted_mode, 0);

	/* WaPruneModeWithIncorrectHsyncOffset: Cantiga+ cannot handle modes
	 * with a hsync front porch of 0.
	 */
	if ((INTEL_INFO(dev)->gen > 4 || IS_G4X(dev)) &&
		adjusted_mode->hsync_start == adjusted_mode->hdisplay)
		return false;

	return true;
}

static int valleyview_get_display_clock_speed(struct drm_device *dev)
{
	return 400000; /* FIXME */
}

static int i945_get_display_clock_speed(struct drm_device *dev)
{
	return 400000;
}

static int i915_get_display_clock_speed(struct drm_device *dev)
{
	return 333000;
}

static int i9xx_misc_get_display_clock_speed(struct drm_device *dev)
{
	return 200000;
}

static int i915gm_get_display_clock_speed(struct drm_device *dev)
{
	u16 gcfgc = 0;

	pci_read_config_word(dev->pdev, GCFGC, &gcfgc);

	if (gcfgc & GC_LOW_FREQUENCY_ENABLE)
		return 133000;
	else {
		switch (gcfgc & GC_DISPLAY_CLOCK_MASK) {
		case GC_DISPLAY_CLOCK_333_MHZ:
			return 333000;
		default:
		case GC_DISPLAY_CLOCK_190_200_MHZ:
			return 190000;
		}
	}
}

static int i865_get_display_clock_speed(struct drm_device *dev)
{
	return 266000;
}

static int i855_get_display_clock_speed(struct drm_device *dev)
{
	u16 hpllcc = 0;
	/* Assume that the hardware is in the high speed state.  This
	 * should be the default.
	 */
	switch (hpllcc & GC_CLOCK_CONTROL_MASK) {
	case GC_CLOCK_133_200:
	case GC_CLOCK_100_200:
		return 200000;
	case GC_CLOCK_166_250:
		return 250000;
	case GC_CLOCK_100_133:
		return 133000;
	}

	/* Shouldn't happen */
	return 0;
}

static int i830_get_display_clock_speed(struct drm_device *dev)
{
	return 133000;
}

static void
intel_reduce_ratio(uint32_t *num, uint32_t *den)
{
	while (*num > 0xffffff || *den > 0xffffff) {
		*num >>= 1;
		*den >>= 1;
	}
}

void
intel_link_compute_m_n(int bits_per_pixel, int nlanes,
		       int pixel_clock, int link_clock,
		       struct intel_link_m_n *m_n)
{
	m_n->tu = 64;
	m_n->gmch_m = bits_per_pixel * pixel_clock;
	m_n->gmch_n = link_clock * nlanes * 8;
	intel_reduce_ratio(&m_n->gmch_m, &m_n->gmch_n);
	m_n->link_m = pixel_clock;
	m_n->link_n = link_clock;
	intel_reduce_ratio(&m_n->link_m, &m_n->link_n);
}

static inline bool intel_panel_use_ssc(struct drm_i915_private *dev_priv)
{
	if (i915_panel_use_ssc >= 0)
		return i915_panel_use_ssc != 0;
	return dev_priv->lvds_use_ssc
		&& !(dev_priv->quirks & QUIRK_LVDS_SSC_DISABLE);
}

/**
 * intel_choose_pipe_bpp_dither - figure out what color depth the pipe should send
 * @crtc: CRTC structure
 * @mode: requested mode
 *
 * A pipe may be connected to one or more outputs.  Based on the depth of the
 * attached framebuffer, choose a good color depth to use on the pipe.
 *
 * If possible, match the pipe depth to the fb depth.  In some cases, this
 * isn't ideal, because the connected output supports a lesser or restricted
 * set of depths.  Resolve that here:
 *    LVDS typically supports only 6bpc, so clamp down in that case
 *    HDMI supports only 8bpc or 12bpc, so clamp to 8bpc with dither for 10bpc
 *    Displays may support a restricted set as well, check EDID and clamp as
 *      appropriate.
 *    DP may want to dither down to 6bpc to fit larger modes
 *
 * RETURNS:
 * Dithering requirement (i.e. false if display bpc and pipe bpc match,
 * true if they don't match).
 */
static bool intel_choose_pipe_bpp_dither(struct drm_crtc *crtc,
					 struct drm_framebuffer *fb,
					 unsigned int *pipe_bpp,
					 struct drm_display_mode *mode)
{
	struct drm_device *dev = crtc->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct drm_connector *connector;
	struct intel_encoder *intel_encoder;
	unsigned int display_bpc = UINT_MAX, bpc;

	/* Walk the encoders & connectors on this crtc, get min bpc */
	for_each_encoder_on_crtc(dev, crtc, intel_encoder) {

		if (intel_encoder->type == INTEL_OUTPUT_LVDS) {
			unsigned int lvds_bpc;

			if ((I915_READ(PCH_LVDS) & LVDS_A3_POWER_MASK) ==
			    LVDS_A3_POWER_UP)
				lvds_bpc = 8;
			else
				lvds_bpc = 6;

			if (lvds_bpc < display_bpc) {
				DRM_DEBUG_KMS("clamping display bpc (was %d) to LVDS (%d)\n", display_bpc, lvds_bpc);
				display_bpc = lvds_bpc;
			}
			continue;
		}

		/* Not one of the known troublemakers, check the EDID */
		list_for_each_entry(connector, &dev->mode_config.connector_list,
				    head) {
			if (connector->encoder != &intel_encoder->base)
				continue;

			/* Don't use an invalid EDID bpc value */
			if (connector->display_info.bpc &&
			    connector->display_info.bpc < display_bpc) {
				DRM_DEBUG_KMS("clamping display bpc (was %d) to EDID reported max of %d\n", display_bpc, connector->display_info.bpc);
				display_bpc = connector->display_info.bpc;
			}
		}

		if (intel_encoder->type == INTEL_OUTPUT_EDP) {
			/* Use VBT settings if we have an eDP panel */
			unsigned int edp_bpc = dev_priv->edp.bpp / 3;

			if (edp_bpc && edp_bpc < display_bpc) {
				DRM_DEBUG_KMS("clamping display bpc (was %d) to eDP (%d)\n", display_bpc, edp_bpc);
				display_bpc = edp_bpc;
			}
			continue;
		}

		/*
		 * HDMI is either 12 or 8, so if the display lets 10bpc sneak
		 * through, clamp it down.  (Note: >12bpc will be caught below.)
		 */
		if (intel_encoder->type == INTEL_OUTPUT_HDMI) {
			if (display_bpc > 8 && display_bpc < 12) {
				DRM_DEBUG_KMS("forcing bpc to 12 for HDMI\n");
				display_bpc = 12;
			} else {
				DRM_DEBUG_KMS("forcing bpc to 8 for HDMI\n");
				display_bpc = 8;
			}
		}
	}

	if (mode->private_flags & INTEL_MODE_DP_FORCE_6BPC) {
		DRM_DEBUG_KMS("Dithering DP to 6bpc\n");
		display_bpc = 6;
	}

	/*
	 * We could just drive the pipe at the highest bpc all the time and
	 * enable dithering as needed, but that costs bandwidth.  So choose
	 * the minimum value that expresses the full color range of the fb but
	 * also stays within the max display bpc discovered above.
	 */

	switch (fb->depth) {
	case 8:
		bpc = 8; /* since we go through a colormap */
		break;
	case 15:
	case 16:
		bpc = 6; /* min is 18bpp */
		break;
	case 24:
		bpc = 8;
		break;
	case 30:
		bpc = 10;
		break;
	case 48:
		bpc = 12;
		break;
	default:
		DRM_DEBUG("unsupported depth, assuming 24 bits\n");
		bpc = min((unsigned int)8, display_bpc);
		break;
	}

	display_bpc = min(display_bpc, bpc);

	DRM_DEBUG_KMS("setting pipe bpc to %d (max display bpc %d)\n",
		      bpc, display_bpc);

	*pipe_bpp = display_bpc * 3;

	return display_bpc != bpc;
}

static int vlv_get_refclk(struct drm_crtc *crtc)
{
	struct drm_device *dev = crtc->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	int refclk = 27000; /* for DP & HDMI */

	return 100000; /* only one validated so far */

	if (intel_pipe_has_type(crtc, INTEL_OUTPUT_ANALOG)) {
		refclk = 96000;
	} else if (intel_pipe_has_type(crtc, INTEL_OUTPUT_LVDS)) {
		if (intel_panel_use_ssc(dev_priv))
			refclk = 100000;
		else
			refclk = 96000;
	} else if (intel_pipe_has_type(crtc, INTEL_OUTPUT_EDP)) {
		refclk = 100000;
	}

	return refclk;
}

static int i9xx_get_refclk(struct drm_crtc *crtc, int num_connectors)
{
	struct drm_device *dev = crtc->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	int refclk;

	if (IS_VALLEYVIEW(dev)) {
		refclk = vlv_get_refclk(crtc);
	} else if (intel_pipe_has_type(crtc, INTEL_OUTPUT_LVDS) &&
	    intel_panel_use_ssc(dev_priv) && num_connectors < 2) {
		refclk = dev_priv->lvds_ssc_freq * 1000;
		DRM_DEBUG_KMS("using SSC reference clock of %d MHz\n",
			      refclk / 1000);
	} else if (!IS_GEN2(dev)) {
		refclk = 96000;
	} else {
		refclk = 48000;
	}

	return refclk;
}

static void i9xx_adjust_sdvo_tv_clock(struct drm_display_mode *adjusted_mode,
				      intel_clock_t *clock)
{
	/* SDVO TV has fixed PLL values depend on its clock range,
	   this mirrors vbios setting. */
	if (adjusted_mode->clock >= 100000
	    && adjusted_mode->clock < 140500) {
		clock->p1 = 2;
		clock->p2 = 10;
		clock->n = 3;
		clock->m1 = 16;
		clock->m2 = 8;
	} else if (adjusted_mode->clock >= 140500
		   && adjusted_mode->clock <= 200000) {
		clock->p1 = 1;
		clock->p2 = 10;
		clock->n = 6;
		clock->m1 = 12;
		clock->m2 = 8;
	}
}

static void i9xx_update_pll_dividers(struct drm_crtc *crtc,
				     intel_clock_t *clock,
				     intel_clock_t *reduced_clock)
{
	struct drm_device *dev = crtc->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
	int pipe = intel_crtc->pipe;
	u32 fp, fp2 = 0;

	if (IS_PINEVIEW(dev)) {
		fp = (1 << clock->n) << 16 | clock->m1 << 8 | clock->m2;
		if (reduced_clock)
			fp2 = (1 << reduced_clock->n) << 16 |
				reduced_clock->m1 << 8 | reduced_clock->m2;
	} else {
		fp = clock->n << 16 | clock->m1 << 8 | clock->m2;
		if (reduced_clock)
			fp2 = reduced_clock->n << 16 | reduced_clock->m1 << 8 |
				reduced_clock->m2;
	}

	I915_WRITE(FP0(pipe), fp);

	intel_crtc->lowfreq_avail = false;
	if (intel_pipe_has_type(crtc, INTEL_OUTPUT_LVDS) &&
	    reduced_clock && i915_powersave) {
		I915_WRITE(FP1(pipe), fp2);
		intel_crtc->lowfreq_avail = true;
	} else {
		I915_WRITE(FP1(pipe), fp);
	}
}

static void vlv_update_pll(struct drm_crtc *crtc,
			   struct drm_display_mode *mode,
			   struct drm_display_mode *adjusted_mode,
			   intel_clock_t *clock, intel_clock_t *reduced_clock,
			   int num_connectors)
{
	struct drm_device *dev = crtc->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
	int pipe = intel_crtc->pipe;
	u32 dpll, mdiv, pdiv;
	u32 bestn, bestm1, bestm2, bestp1, bestp2;
	bool is_sdvo;
	u32 temp;

	mutex_lock(&dev_priv->dpio_lock);

	is_sdvo = intel_pipe_has_type(crtc, INTEL_OUTPUT_SDVO) ||
		intel_pipe_has_type(crtc, INTEL_OUTPUT_HDMI);

	dpll = DPLL_VGA_MODE_DIS;
	dpll |= DPLL_EXT_BUFFER_ENABLE_VLV;
	dpll |= DPLL_REFA_CLK_ENABLE_VLV;
	dpll |= DPLL_INTEGRATED_CLOCK_VLV;

	I915_WRITE(DPLL(pipe), dpll);
	POSTING_READ(DPLL(pipe));

	bestn = clock->n;
	bestm1 = clock->m1;
	bestm2 = clock->m2;
	bestp1 = clock->p1;
	bestp2 = clock->p2;

	/*
	 * In Valleyview PLL and program lane counter registers are exposed
	 * through DPIO interface
	 */
	mdiv = ((bestm1 << DPIO_M1DIV_SHIFT) | (bestm2 & DPIO_M2DIV_MASK));
	mdiv |= ((bestp1 << DPIO_P1_SHIFT) | (bestp2 << DPIO_P2_SHIFT));
	mdiv |= ((bestn << DPIO_N_SHIFT));
	mdiv |= (1 << DPIO_POST_DIV_SHIFT);
	mdiv |= (1 << DPIO_K_SHIFT);
	mdiv |= DPIO_ENABLE_CALIBRATION;
	intel_dpio_write(dev_priv, DPIO_DIV(pipe), mdiv);

	intel_dpio_write(dev_priv, DPIO_CORE_CLK(pipe), 0x01000000);

	pdiv = (1 << DPIO_REFSEL_OVERRIDE) | (5 << DPIO_PLL_MODESEL_SHIFT) |
		(3 << DPIO_BIAS_CURRENT_CTL_SHIFT) | (1<<20) |
		(7 << DPIO_PLL_REFCLK_SEL_SHIFT) | (8 << DPIO_DRIVER_CTL_SHIFT) |
		(5 << DPIO_CLK_BIAS_CTL_SHIFT);
	intel_dpio_write(dev_priv, DPIO_REFSFR(pipe), pdiv);

	intel_dpio_write(dev_priv, DPIO_LFP_COEFF(pipe), 0x005f003b);

	dpll |= DPLL_VCO_ENABLE;
	I915_WRITE(DPLL(pipe), dpll);
	POSTING_READ(DPLL(pipe));
	if (wait_for(((I915_READ(DPLL(pipe)) & DPLL_LOCK_VLV) == DPLL_LOCK_VLV), 1))
		DRM_ERROR("DPLL %d failed to lock\n", pipe);

	intel_dpio_write(dev_priv, DPIO_FASTCLK_DISABLE, 0x620);

	if (intel_pipe_has_type(crtc, INTEL_OUTPUT_DISPLAYPORT))
		intel_dp_set_m_n(crtc, mode, adjusted_mode);

	I915_WRITE(DPLL(pipe), dpll);

	/* Wait for the clocks to stabilize. */
	POSTING_READ(DPLL(pipe));
	udelay(150);

	temp = 0;
	if (is_sdvo) {
		temp = intel_mode_get_pixel_multiplier(adjusted_mode);
		if (temp > 1)
			temp = (temp - 1) << DPLL_MD_UDI_MULTIPLIER_SHIFT;
		else
			temp = 0;
	}
	I915_WRITE(DPLL_MD(pipe), temp);
	POSTING_READ(DPLL_MD(pipe));

	/* Now program lane control registers */
	if(intel_pipe_has_type(crtc, INTEL_OUTPUT_DISPLAYPORT)
			|| intel_pipe_has_type(crtc, INTEL_OUTPUT_HDMI))
	{
		temp = 0x1000C4;
		if(pipe == 1)
			temp |= (1 << 21);
		intel_dpio_write(dev_priv, DPIO_DATA_CHANNEL1, temp);
	}
	if(intel_pipe_has_type(crtc,INTEL_OUTPUT_EDP))
	{
		temp = 0x1000C4;
		if(pipe == 1)
			temp |= (1 << 21);
		intel_dpio_write(dev_priv, DPIO_DATA_CHANNEL2, temp);
	}

	mutex_unlock(&dev_priv->dpio_lock);
}

static void i9xx_update_pll(struct drm_crtc *crtc,
			    struct drm_display_mode *mode,
			    struct drm_display_mode *adjusted_mode,
			    intel_clock_t *clock, intel_clock_t *reduced_clock,
			    int num_connectors)
{
	struct drm_device *dev = crtc->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
	struct intel_encoder *encoder;
	int pipe = intel_crtc->pipe;
	u32 dpll;
	bool is_sdvo;

	i9xx_update_pll_dividers(crtc, clock, reduced_clock);

	is_sdvo = intel_pipe_has_type(crtc, INTEL_OUTPUT_SDVO) ||
		intel_pipe_has_type(crtc, INTEL_OUTPUT_HDMI);

	dpll = DPLL_VGA_MODE_DIS;

	if (intel_pipe_has_type(crtc, INTEL_OUTPUT_LVDS))
		dpll |= DPLLB_MODE_LVDS;
	else
		dpll |= DPLLB_MODE_DAC_SERIAL;
	if (is_sdvo) {
		int pixel_multiplier = intel_mode_get_pixel_multiplier(adjusted_mode);
		if (pixel_multiplier > 1) {
			if (IS_I945G(dev) || IS_I945GM(dev) || IS_G33(dev))
				dpll |= (pixel_multiplier - 1) << SDVO_MULTIPLIER_SHIFT_HIRES;
		}
		dpll |= DPLL_DVO_HIGH_SPEED;
	}
	if (intel_pipe_has_type(crtc, INTEL_OUTPUT_DISPLAYPORT))
		dpll |= DPLL_DVO_HIGH_SPEED;

	/* compute bitmask from p1 value */
	if (IS_PINEVIEW(dev))
		dpll |= (1 << (clock->p1 - 1)) << DPLL_FPA01_P1_POST_DIV_SHIFT_PINEVIEW;
	else {
		dpll |= (1 << (clock->p1 - 1)) << DPLL_FPA01_P1_POST_DIV_SHIFT;
		if (IS_G4X(dev) && reduced_clock)
			dpll |= (1 << (reduced_clock->p1 - 1)) << DPLL_FPA1_P1_POST_DIV_SHIFT;
	}
	switch (clock->p2) {
	case 5:
		dpll |= DPLL_DAC_SERIAL_P2_CLOCK_DIV_5;
		break;
	case 7:
		dpll |= DPLLB_LVDS_P2_CLOCK_DIV_7;
		break;
	case 10:
		dpll |= DPLL_DAC_SERIAL_P2_CLOCK_DIV_10;
		break;
	case 14:
		dpll |= DPLLB_LVDS_P2_CLOCK_DIV_14;
		break;
	}
	if (INTEL_INFO(dev)->gen >= 4)
		dpll |= (6 << PLL_LOAD_PULSE_PHASE_SHIFT);

	if (is_sdvo && intel_pipe_has_type(crtc, INTEL_OUTPUT_TVOUT))
		dpll |= PLL_REF_INPUT_TVCLKINBC;
	else if (intel_pipe_has_type(crtc, INTEL_OUTPUT_TVOUT))
		/* XXX: just matching BIOS for now */
		/*	dpll |= PLL_REF_INPUT_TVCLKINBC; */
		dpll |= 3;
	else if (intel_pipe_has_type(crtc, INTEL_OUTPUT_LVDS) &&
		 intel_panel_use_ssc(dev_priv) && num_connectors < 2)
		dpll |= PLLB_REF_INPUT_SPREADSPECTRUMIN;
	else
		dpll |= PLL_REF_INPUT_DREFCLK;

	dpll |= DPLL_VCO_ENABLE;
	I915_WRITE(DPLL(pipe), dpll & ~DPLL_VCO_ENABLE);
	POSTING_READ(DPLL(pipe));
	udelay(150);

	for_each_encoder_on_crtc(dev, crtc, encoder)
		if (encoder->pre_pll_enable)
			encoder->pre_pll_enable(encoder);

	if (intel_pipe_has_type(crtc, INTEL_OUTPUT_DISPLAYPORT))
		intel_dp_set_m_n(crtc, mode, adjusted_mode);

	I915_WRITE(DPLL(pipe), dpll);

	/* Wait for the clocks to stabilize. */
	POSTING_READ(DPLL(pipe));
	udelay(150);

	if (INTEL_INFO(dev)->gen >= 4) {
		u32 temp = 0;
		if (is_sdvo) {
			temp = intel_mode_get_pixel_multiplier(adjusted_mode);
			if (temp > 1)
				temp = (temp - 1) << DPLL_MD_UDI_MULTIPLIER_SHIFT;
			else
				temp = 0;
		}
		I915_WRITE(DPLL_MD(pipe), temp);
	} else {
		/* The pixel multiplier can only be updated once the
		 * DPLL is enabled and the clocks are stable.
		 *
		 * So write it again.
		 */
		I915_WRITE(DPLL(pipe), dpll);
	}
}

static void i8xx_update_pll(struct drm_crtc *crtc,
			    struct drm_display_mode *adjusted_mode,
			    intel_clock_t *clock, intel_clock_t *reduced_clock,
			    int num_connectors)
{
	struct drm_device *dev = crtc->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
	struct intel_encoder *encoder;
	int pipe = intel_crtc->pipe;
	u32 dpll;

	i9xx_update_pll_dividers(crtc, clock, reduced_clock);

	dpll = DPLL_VGA_MODE_DIS;

	if (intel_pipe_has_type(crtc, INTEL_OUTPUT_LVDS)) {
		dpll |= (1 << (clock->p1 - 1)) << DPLL_FPA01_P1_POST_DIV_SHIFT;
	} else {
		if (clock->p1 == 2)
			dpll |= PLL_P1_DIVIDE_BY_TWO;
		else
			dpll |= (clock->p1 - 2) << DPLL_FPA01_P1_POST_DIV_SHIFT;
		if (clock->p2 == 4)
			dpll |= PLL_P2_DIVIDE_BY_4;
	}

	if (intel_pipe_has_type(crtc, INTEL_OUTPUT_TVOUT))
		/* XXX: just matching BIOS for now */
		/*	dpll |= PLL_REF_INPUT_TVCLKINBC; */
		dpll |= 3;
	else if (intel_pipe_has_type(crtc, INTEL_OUTPUT_LVDS) &&
		 intel_panel_use_ssc(dev_priv) && num_connectors < 2)
		dpll |= PLLB_REF_INPUT_SPREADSPECTRUMIN;
	else
		dpll |= PLL_REF_INPUT_DREFCLK;

	dpll |= DPLL_VCO_ENABLE;
	I915_WRITE(DPLL(pipe), dpll & ~DPLL_VCO_ENABLE);
	POSTING_READ(DPLL(pipe));
	udelay(150);

	for_each_encoder_on_crtc(dev, crtc, encoder)
		if (encoder->pre_pll_enable)
			encoder->pre_pll_enable(encoder);

	I915_WRITE(DPLL(pipe), dpll);

	/* Wait for the clocks to stabilize. */
	POSTING_READ(DPLL(pipe));
	udelay(150);

	/* The pixel multiplier can only be updated once the
	 * DPLL is enabled and the clocks are stable.
	 *
	 * So write it again.
	 */
	I915_WRITE(DPLL(pipe), dpll);
}

static void intel_set_pipe_timings(struct intel_crtc *intel_crtc,
				   struct drm_display_mode *mode,
				   struct drm_display_mode *adjusted_mode)
{
	struct drm_device *dev = intel_crtc->base.dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	enum pipe pipe = intel_crtc->pipe;
	enum transcoder cpu_transcoder = intel_crtc->cpu_transcoder;
	uint32_t vsyncshift;

	if (!IS_GEN2(dev) && adjusted_mode->flags & DRM_MODE_FLAG_INTERLACE) {
		/* the chip adds 2 halflines automatically */
		adjusted_mode->crtc_vtotal -= 1;
		adjusted_mode->crtc_vblank_end -= 1;
		vsyncshift = adjusted_mode->crtc_hsync_start
			     - adjusted_mode->crtc_htotal / 2;
	} else {
		vsyncshift = 0;
	}

	if (INTEL_INFO(dev)->gen > 3)
		I915_WRITE(VSYNCSHIFT(cpu_transcoder), vsyncshift);

	I915_WRITE(HTOTAL(cpu_transcoder),
		   (adjusted_mode->crtc_hdisplay - 1) |
		   ((adjusted_mode->crtc_htotal - 1) << 16));
	I915_WRITE(HBLANK(cpu_transcoder),
		   (adjusted_mode->crtc_hblank_start - 1) |
		   ((adjusted_mode->crtc_hblank_end - 1) << 16));
	I915_WRITE(HSYNC(cpu_transcoder),
		   (adjusted_mode->crtc_hsync_start - 1) |
		   ((adjusted_mode->crtc_hsync_end - 1) << 16));

	I915_WRITE(VTOTAL(cpu_transcoder),
		   (adjusted_mode->crtc_vdisplay - 1) |
		   ((adjusted_mode->crtc_vtotal - 1) << 16));
	I915_WRITE(VBLANK(cpu_transcoder),
		   (adjusted_mode->crtc_vblank_start - 1) |
		   ((adjusted_mode->crtc_vblank_end - 1) << 16));
	I915_WRITE(VSYNC(cpu_transcoder),
		   (adjusted_mode->crtc_vsync_start - 1) |
		   ((adjusted_mode->crtc_vsync_end - 1) << 16));

	/* Workaround: when the EDP input selection is B, the VTOTAL_B must be
	 * programmed with the VTOTAL_EDP value. Same for VTOTAL_C. This is
	 * documented on the DDI_FUNC_CTL register description, EDP Input Select
	 * bits. */
	if (IS_HASWELL(dev) && cpu_transcoder == TRANSCODER_EDP &&
	    (pipe == PIPE_B || pipe == PIPE_C))
		I915_WRITE(VTOTAL(pipe), I915_READ(VTOTAL(cpu_transcoder)));

	/* pipesrc controls the size that is scaled from, which should
	 * always be the user's requested size.
	 */
	I915_WRITE(PIPESRC(pipe),
		   ((mode->hdisplay - 1) << 16) | (mode->vdisplay - 1));
}

static int i9xx_crtc_mode_set(struct drm_crtc *crtc,
			      struct drm_display_mode *mode,
			      struct drm_display_mode *adjusted_mode,
			      int x, int y,
			      struct drm_framebuffer *fb)
{
	struct drm_device *dev = crtc->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
	int pipe = intel_crtc->pipe;
	int plane = intel_crtc->plane;
	int refclk, num_connectors = 0;
	intel_clock_t clock, reduced_clock;
	u32 dspcntr, pipeconf;
	bool ok, has_reduced_clock = false, is_sdvo = false;
	bool is_lvds = false, is_tv = false, is_dp = false;
	struct intel_encoder *encoder;
	const intel_limit_t *limit;
	int ret;

	for_each_encoder_on_crtc(dev, crtc, encoder) {
		switch (encoder->type) {
		case INTEL_OUTPUT_LVDS:
			is_lvds = true;
			break;
		case INTEL_OUTPUT_SDVO:
		case INTEL_OUTPUT_HDMI:
			is_sdvo = true;
			if (encoder->needs_tv_clock)
				is_tv = true;
			break;
		case INTEL_OUTPUT_TVOUT:
			is_tv = true;
			break;
		case INTEL_OUTPUT_DISPLAYPORT:
			is_dp = true;
			break;
		}

		num_connectors++;
	}

	refclk = i9xx_get_refclk(crtc, num_connectors);

	/*
	 * Returns a set of divisors for the desired target clock with the given
	 * refclk, or FALSE.  The returned values represent the clock equation:
	 * reflck * (5 * (m1 + 2) + (m2 + 2)) / (n + 2) / p1 / p2.
	 */
	limit = intel_limit(crtc, refclk);
	ok = limit->find_pll(limit, crtc, adjusted_mode->clock, refclk, NULL,
			     &clock);
	if (!ok) {
		DRM_ERROR("Couldn't find PLL settings for mode!\n");
		return -EINVAL;
	}

	/* Ensure that the cursor is valid for the new mode before changing... */
	intel_crtc_update_cursor(crtc, true);

	if (is_lvds && dev_priv->lvds_downclock_avail) {
		/*
		 * Ensure we match the reduced clock's P to the target clock.
		 * If the clocks don't match, we can't switch the display clock
		 * by using the FP0/FP1. In such case we will disable the LVDS
		 * downclock feature.
		*/
		has_reduced_clock = limit->find_pll(limit, crtc,
						    dev_priv->lvds_downclock,
						    refclk,
						    &clock,
						    &reduced_clock);
	}

	if (is_sdvo && is_tv)
		i9xx_adjust_sdvo_tv_clock(adjusted_mode, &clock);

	if (IS_GEN2(dev))
		i8xx_update_pll(crtc, adjusted_mode, &clock,
				has_reduced_clock ? &reduced_clock : NULL,
				num_connectors);
	else if (IS_VALLEYVIEW(dev))
		vlv_update_pll(crtc, mode, adjusted_mode, &clock,
				has_reduced_clock ? &reduced_clock : NULL,
				num_connectors);
	else
		i9xx_update_pll(crtc, mode, adjusted_mode, &clock,
				has_reduced_clock ? &reduced_clock : NULL,
				num_connectors);

	/* setup pipeconf */
	pipeconf = I915_READ(PIPECONF(pipe));

	/* Set up the display plane register */
	dspcntr = DISPPLANE_GAMMA_ENABLE;

	if (pipe == 0)
		dspcntr &= ~DISPPLANE_SEL_PIPE_MASK;
	else
		dspcntr |= DISPPLANE_SEL_PIPE_B;

	if (pipe == 0 && INTEL_INFO(dev)->gen < 4) {
		/* Enable pixel doubling when the dot clock is > 90% of the (display)
		 * core speed.
		 *
		 * XXX: No double-wide on 915GM pipe B. Is that the only reason for the
		 * pipe == 0 check?
		 */
		if (mode->clock >
		    dev_priv->display.get_display_clock_speed(dev) * 9 / 10)
			pipeconf |= PIPECONF_DOUBLE_WIDE;
		else
			pipeconf &= ~PIPECONF_DOUBLE_WIDE;
	}

	/* default to 8bpc */
	pipeconf &= ~(PIPECONF_BPC_MASK | PIPECONF_DITHER_EN);
	if (is_dp) {
		if (adjusted_mode->private_flags & INTEL_MODE_DP_FORCE_6BPC) {
			pipeconf |= PIPECONF_6BPC |
				    PIPECONF_DITHER_EN |
				    PIPECONF_DITHER_TYPE_SP;
		}
	}

	if (IS_VALLEYVIEW(dev) && intel_pipe_has_type(crtc, INTEL_OUTPUT_EDP)) {
		if (adjusted_mode->private_flags & INTEL_MODE_DP_FORCE_6BPC) {
			pipeconf |= PIPECONF_6BPC |
					PIPECONF_ENABLE |
					I965_PIPECONF_ACTIVE;
		}
	}

	DRM_DEBUG_KMS("Mode for pipe %c:\n", pipe == 0 ? 'A' : 'B');
	drm_mode_debug_printmodeline(mode);

	if (HAS_PIPE_CXSR(dev)) {
		if (intel_crtc->lowfreq_avail) {
			DRM_DEBUG_KMS("enabling CxSR downclocking\n");
			pipeconf |= PIPECONF_CXSR_DOWNCLOCK;
		} else {
			DRM_DEBUG_KMS("disabling CxSR downclocking\n");
			pipeconf &= ~PIPECONF_CXSR_DOWNCLOCK;
		}
	}

	pipeconf &= ~PIPECONF_INTERLACE_MASK;
	if (!IS_GEN2(dev) &&
	    adjusted_mode->flags & DRM_MODE_FLAG_INTERLACE)
		pipeconf |= PIPECONF_INTERLACE_W_FIELD_INDICATION;
	else
		pipeconf |= PIPECONF_PROGRESSIVE;

	intel_set_pipe_timings(intel_crtc, mode, adjusted_mode);

	/* pipesrc and dspsize control the size that is scaled from,
	 * which should always be the user's requested size.
	 */
	I915_WRITE(DSPSIZE(plane),
		   ((mode->vdisplay - 1) << 16) |
		   (mode->hdisplay - 1));
	I915_WRITE(DSPPOS(plane), 0);

	I915_WRITE(PIPECONF(pipe), pipeconf);
	POSTING_READ(PIPECONF(pipe));
	intel_enable_pipe(dev_priv, pipe, false);

	intel_wait_for_vblank(dev, pipe);

	I915_WRITE(DSPCNTR(plane), dspcntr);
	POSTING_READ(DSPCNTR(plane));

	ret = intel_pipe_set_base(crtc, x, y, fb);

	intel_update_watermarks(dev);

	return ret;
}

static void ironlake_init_pch_refclk(struct drm_device *dev)
{
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct drm_mode_config *mode_config = &dev->mode_config;
	struct intel_encoder *encoder;
	u32 temp;
	bool has_lvds = false;
	bool has_cpu_edp = false;
	bool has_pch_edp = false;
	bool has_panel = false;
	bool has_ck505 = false;
	bool can_ssc = false;

	/* We need to take the global config into account */
	list_for_each_entry(encoder, &mode_config->encoder_list,
			    base.head) {
		switch (encoder->type) {
		case INTEL_OUTPUT_LVDS:
			has_panel = true;
			has_lvds = true;
			break;
		case INTEL_OUTPUT_EDP:
			has_panel = true;
			if (intel_encoder_is_pch_edp(&encoder->base))
				has_pch_edp = true;
			else
				has_cpu_edp = true;
			break;
		}
	}

	if (HAS_PCH_IBX(dev)) {
		has_ck505 = dev_priv->display_clock_mode;
		can_ssc = has_ck505;
	} else {
		has_ck505 = false;
		can_ssc = true;
	}

	DRM_DEBUG_KMS("has_panel %d has_lvds %d has_pch_edp %d has_cpu_edp %d has_ck505 %d\n",
		      has_panel, has_lvds, has_pch_edp, has_cpu_edp,
		      has_ck505);

	/* Ironlake: try to setup display ref clock before DPLL
	 * enabling. This is only under driver's control after
	 * PCH B stepping, previous chipset stepping should be
	 * ignoring this setting.
	 */
	temp = I915_READ(PCH_DREF_CONTROL);
	/* Always enable nonspread source */
	temp &= ~DREF_NONSPREAD_SOURCE_MASK;

	if (has_ck505)
		temp |= DREF_NONSPREAD_CK505_ENABLE;
	else
		temp |= DREF_NONSPREAD_SOURCE_ENABLE;

	if (has_panel) {
		temp &= ~DREF_SSC_SOURCE_MASK;
		temp |= DREF_SSC_SOURCE_ENABLE;

		/* SSC must be turned on before enabling the CPU output  */
		if (intel_panel_use_ssc(dev_priv) && can_ssc) {
			DRM_DEBUG_KMS("Using SSC on panel\n");
			temp |= DREF_SSC1_ENABLE;
		} else
			temp &= ~DREF_SSC1_ENABLE;

		/* Get SSC going before enabling the outputs */
		I915_WRITE(PCH_DREF_CONTROL, temp);
		POSTING_READ(PCH_DREF_CONTROL);
		udelay(200);

		temp &= ~DREF_CPU_SOURCE_OUTPUT_MASK;

		/* Enable CPU source on CPU attached eDP */
		if (has_cpu_edp) {
			if (intel_panel_use_ssc(dev_priv) && can_ssc) {
				DRM_DEBUG_KMS("Using SSC on eDP\n");
				temp |= DREF_CPU_SOURCE_OUTPUT_DOWNSPREAD;
			}
			else
				temp |= DREF_CPU_SOURCE_OUTPUT_NONSPREAD;
		} else
			temp |= DREF_CPU_SOURCE_OUTPUT_DISABLE;

		I915_WRITE(PCH_DREF_CONTROL, temp);
		POSTING_READ(PCH_DREF_CONTROL);
		udelay(200);
	} else {
		DRM_DEBUG_KMS("Disabling SSC entirely\n");

		temp &= ~DREF_CPU_SOURCE_OUTPUT_MASK;

		/* Turn off CPU output */
		temp |= DREF_CPU_SOURCE_OUTPUT_DISABLE;

		I915_WRITE(PCH_DREF_CONTROL, temp);
		POSTING_READ(PCH_DREF_CONTROL);
		udelay(200);

		/* Turn off the SSC source */
		temp &= ~DREF_SSC_SOURCE_MASK;
		temp |= DREF_SSC_SOURCE_DISABLE;

		/* Turn off SSC1 */
		temp &= ~ DREF_SSC1_ENABLE;

		I915_WRITE(PCH_DREF_CONTROL, temp);
		POSTING_READ(PCH_DREF_CONTROL);
		udelay(200);
	}
}

/* Sequence to enable CLKOUT_DP for FDI usage and configure PCH FDI I/O. */
static void lpt_init_pch_refclk(struct drm_device *dev)
{
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct drm_mode_config *mode_config = &dev->mode_config;
	struct intel_encoder *encoder;
	bool has_vga = false;
	bool is_sdv = false;
	u32 tmp;

	list_for_each_entry(encoder, &mode_config->encoder_list, base.head) {
		switch (encoder->type) {
		case INTEL_OUTPUT_ANALOG:
			has_vga = true;
			break;
		}
	}

	if (!has_vga)
		return;

	mutex_lock(&dev_priv->dpio_lock);

	/* XXX: Rip out SDV support once Haswell ships for real. */
	if (IS_HASWELL(dev) && (dev->pci_device & 0xFF00) == 0x0C00)
		is_sdv = true;

	tmp = intel_sbi_read(dev_priv, SBI_SSCCTL, SBI_ICLK);
	tmp &= ~SBI_SSCCTL_DISABLE;
	tmp |= SBI_SSCCTL_PATHALT;
	intel_sbi_write(dev_priv, SBI_SSCCTL, tmp, SBI_ICLK);

	udelay(24);

	tmp = intel_sbi_read(dev_priv, SBI_SSCCTL, SBI_ICLK);
	tmp &= ~SBI_SSCCTL_PATHALT;
	intel_sbi_write(dev_priv, SBI_SSCCTL, tmp, SBI_ICLK);

	if (!is_sdv) {
		tmp = I915_READ(SOUTH_CHICKEN2);
		tmp |= FDI_MPHY_IOSFSB_RESET_CTL;
		I915_WRITE(SOUTH_CHICKEN2, tmp);

		if (wait_for_atomic_us(I915_READ(SOUTH_CHICKEN2) &
				       FDI_MPHY_IOSFSB_RESET_STATUS, 100))
			DRM_ERROR("FDI mPHY reset assert timeout\n");

		tmp = I915_READ(SOUTH_CHICKEN2);
		tmp &= ~FDI_MPHY_IOSFSB_RESET_CTL;
		I915_WRITE(SOUTH_CHICKEN2, tmp);

		if (wait_for_atomic_us((I915_READ(SOUTH_CHICKEN2) &
				        FDI_MPHY_IOSFSB_RESET_STATUS) == 0,
				       100))
			DRM_ERROR("FDI mPHY reset de-assert timeout\n");
	}

	tmp = intel_sbi_read(dev_priv, 0x8008, SBI_MPHY);
	tmp &= ~(0xFF << 24);
	tmp |= (0x12 << 24);
	intel_sbi_write(dev_priv, 0x8008, tmp, SBI_MPHY);

	if (!is_sdv) {
		tmp = intel_sbi_read(dev_priv, 0x808C, SBI_MPHY);
		tmp &= ~(0x3 << 6);
		tmp |= (1 << 6) | (1 << 0);
		intel_sbi_write(dev_priv, 0x808C, tmp, SBI_MPHY);
	}

	if (is_sdv) {
		tmp = intel_sbi_read(dev_priv, 0x800C, SBI_MPHY);
		tmp |= 0x7FFF;
		intel_sbi_write(dev_priv, 0x800C, tmp, SBI_MPHY);
	}

	tmp = intel_sbi_read(dev_priv, 0x2008, SBI_MPHY);
	tmp |= (1 << 11);
	intel_sbi_write(dev_priv, 0x2008, tmp, SBI_MPHY);

	tmp = intel_sbi_read(dev_priv, 0x2108, SBI_MPHY);
	tmp |= (1 << 11);
	intel_sbi_write(dev_priv, 0x2108, tmp, SBI_MPHY);

	if (is_sdv) {
		tmp = intel_sbi_read(dev_priv, 0x2038, SBI_MPHY);
		tmp |= (0x3F << 24) | (0xF << 20) | (0xF << 16);
		intel_sbi_write(dev_priv, 0x2038, tmp, SBI_MPHY);

		tmp = intel_sbi_read(dev_priv, 0x2138, SBI_MPHY);
		tmp |= (0x3F << 24) | (0xF << 20) | (0xF << 16);
		intel_sbi_write(dev_priv, 0x2138, tmp, SBI_MPHY);

		tmp = intel_sbi_read(dev_priv, 0x203C, SBI_MPHY);
		tmp |= (0x3F << 8);
		intel_sbi_write(dev_priv, 0x203C, tmp, SBI_MPHY);

		tmp = intel_sbi_read(dev_priv, 0x213C, SBI_MPHY);
		tmp |= (0x3F << 8);
		intel_sbi_write(dev_priv, 0x213C, tmp, SBI_MPHY);
	}

	tmp = intel_sbi_read(dev_priv, 0x206C, SBI_MPHY);
	tmp |= (1 << 24) | (1 << 21) | (1 << 18);
	intel_sbi_write(dev_priv, 0x206C, tmp, SBI_MPHY);

	tmp = intel_sbi_read(dev_priv, 0x216C, SBI_MPHY);
	tmp |= (1 << 24) | (1 << 21) | (1 << 18);
	intel_sbi_write(dev_priv, 0x216C, tmp, SBI_MPHY);

	if (!is_sdv) {
		tmp = intel_sbi_read(dev_priv, 0x2080, SBI_MPHY);
		tmp &= ~(7 << 13);
		tmp |= (5 << 13);
		intel_sbi_write(dev_priv, 0x2080, tmp, SBI_MPHY);

		tmp = intel_sbi_read(dev_priv, 0x2180, SBI_MPHY);
		tmp &= ~(7 << 13);
		tmp |= (5 << 13);
		intel_sbi_write(dev_priv, 0x2180, tmp, SBI_MPHY);
	}

	tmp = intel_sbi_read(dev_priv, 0x208C, SBI_MPHY);
	tmp &= ~0xFF;
	tmp |= 0x1C;
	intel_sbi_write(dev_priv, 0x208C, tmp, SBI_MPHY);

	tmp = intel_sbi_read(dev_priv, 0x218C, SBI_MPHY);
	tmp &= ~0xFF;
	tmp |= 0x1C;
	intel_sbi_write(dev_priv, 0x218C, tmp, SBI_MPHY);

	tmp = intel_sbi_read(dev_priv, 0x2098, SBI_MPHY);
	tmp &= ~(0xFF << 16);
	tmp |= (0x1C << 16);
	intel_sbi_write(dev_priv, 0x2098, tmp, SBI_MPHY);

	tmp = intel_sbi_read(dev_priv, 0x2198, SBI_MPHY);
	tmp &= ~(0xFF << 16);
	tmp |= (0x1C << 16);
	intel_sbi_write(dev_priv, 0x2198, tmp, SBI_MPHY);

	if (!is_sdv) {
		tmp = intel_sbi_read(dev_priv, 0x20C4, SBI_MPHY);
		tmp |= (1 << 27);
		intel_sbi_write(dev_priv, 0x20C4, tmp, SBI_MPHY);

		tmp = intel_sbi_read(dev_priv, 0x21C4, SBI_MPHY);
		tmp |= (1 << 27);
		intel_sbi_write(dev_priv, 0x21C4, tmp, SBI_MPHY);

		tmp = intel_sbi_read(dev_priv, 0x20EC, SBI_MPHY);
		tmp &= ~(0xF << 28);
		tmp |= (4 << 28);
		intel_sbi_write(dev_priv, 0x20EC, tmp, SBI_MPHY);

		tmp = intel_sbi_read(dev_priv, 0x21EC, SBI_MPHY);
		tmp &= ~(0xF << 28);
		tmp |= (4 << 28);
		intel_sbi_write(dev_priv, 0x21EC, tmp, SBI_MPHY);
	}

	/* ULT uses SBI_GEN0, but ULT doesn't have VGA, so we don't care. */
	tmp = intel_sbi_read(dev_priv, SBI_DBUFF0, SBI_ICLK);
	tmp |= SBI_DBUFF0_ENABLE;
	intel_sbi_write(dev_priv, SBI_DBUFF0, tmp, SBI_ICLK);

	mutex_unlock(&dev_priv->dpio_lock);
}

/*
 * Initialize reference clocks when the driver loads
 */
void intel_init_pch_refclk(struct drm_device *dev)
{
	if (HAS_PCH_IBX(dev) || HAS_PCH_CPT(dev))
		ironlake_init_pch_refclk(dev);
	else if (HAS_PCH_LPT(dev))
		lpt_init_pch_refclk(dev);
}

static int ironlake_get_refclk(struct drm_crtc *crtc)
{
	struct drm_device *dev = crtc->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_encoder *encoder;
	struct intel_encoder *edp_encoder = NULL;
	int num_connectors = 0;
	bool is_lvds = false;

	for_each_encoder_on_crtc(dev, crtc, encoder) {
		switch (encoder->type) {
		case INTEL_OUTPUT_LVDS:
			is_lvds = true;
			break;
		case INTEL_OUTPUT_EDP:
			edp_encoder = encoder;
			break;
		}
		num_connectors++;
	}

	if (is_lvds && intel_panel_use_ssc(dev_priv) && num_connectors < 2) {
		DRM_DEBUG_KMS("using SSC reference clock of %d MHz\n",
			      dev_priv->lvds_ssc_freq);
		return dev_priv->lvds_ssc_freq * 1000;
	}

	return 120000;
}

static void ironlake_set_pipeconf(struct drm_crtc *crtc,
				  struct drm_display_mode *adjusted_mode,
				  bool dither)
{
	struct drm_i915_private *dev_priv = crtc->dev->dev_private;
	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
	int pipe = intel_crtc->pipe;
	uint32_t val;

	val = I915_READ(PIPECONF(pipe));

	val &= ~PIPECONF_BPC_MASK;
	switch (intel_crtc->bpp) {
	case 18:
		val |= PIPECONF_6BPC;
		break;
	case 24:
		val |= PIPECONF_8BPC;
		break;
	case 30:
		val |= PIPECONF_10BPC;
		break;
	case 36:
		val |= PIPECONF_12BPC;
		break;
	default:
		/* Case prevented by intel_choose_pipe_bpp_dither. */
		BUG();
	}

	val &= ~(PIPECONF_DITHER_EN | PIPECONF_DITHER_TYPE_MASK);
	if (dither)
		val |= (PIPECONF_DITHER_EN | PIPECONF_DITHER_TYPE_SP);

	val &= ~PIPECONF_INTERLACE_MASK;
	if (adjusted_mode->flags & DRM_MODE_FLAG_INTERLACE)
		val |= PIPECONF_INTERLACED_ILK;
	else
		val |= PIPECONF_PROGRESSIVE;

	if (adjusted_mode->private_flags & INTEL_MODE_LIMITED_COLOR_RANGE)
		val |= PIPECONF_COLOR_RANGE_SELECT;
	else
		val &= ~PIPECONF_COLOR_RANGE_SELECT;

	I915_WRITE(PIPECONF(pipe), val);
	POSTING_READ(PIPECONF(pipe));
}

/*
 * Set up the pipe CSC unit.
 *
 * Currently only full range RGB to limited range RGB conversion
 * is supported, but eventually this should handle various
 * RGB<->YCbCr scenarios as well.
 */
static void intel_set_pipe_csc(struct drm_crtc *crtc,
			       const struct drm_display_mode *adjusted_mode)
{
	struct drm_device *dev = crtc->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
	int pipe = intel_crtc->pipe;
	uint16_t coeff = 0x7800; /* 1.0 */

	/*
	 * TODO: Check what kind of values actually come out of the pipe
	 * with these coeff/postoff values and adjust to get the best
	 * accuracy. Perhaps we even need to take the bpc value into
	 * consideration.
	 */

	if (adjusted_mode->private_flags & INTEL_MODE_LIMITED_COLOR_RANGE)
		coeff = ((235 - 16) * (1 << 12) / 255) & 0xff8; /* 0.xxx... */

	/*
	 * GY/GU and RY/RU should be the other way around according
	 * to BSpec, but reality doesn't agree. Just set them up in
	 * a way that results in the correct picture.
	 */
	I915_WRITE(PIPE_CSC_COEFF_RY_GY(pipe), coeff << 16);
	I915_WRITE(PIPE_CSC_COEFF_BY(pipe), 0);

	I915_WRITE(PIPE_CSC_COEFF_RU_GU(pipe), coeff);
	I915_WRITE(PIPE_CSC_COEFF_BU(pipe), 0);

	I915_WRITE(PIPE_CSC_COEFF_RV_GV(pipe), 0);
	I915_WRITE(PIPE_CSC_COEFF_BV(pipe), coeff << 16);

	I915_WRITE(PIPE_CSC_PREOFF_HI(pipe), 0);
	I915_WRITE(PIPE_CSC_PREOFF_ME(pipe), 0);
	I915_WRITE(PIPE_CSC_PREOFF_LO(pipe), 0);

	if (INTEL_INFO(dev)->gen > 6) {
		uint16_t postoff = 0;

		if (adjusted_mode->private_flags & INTEL_MODE_LIMITED_COLOR_RANGE)
			postoff = (16 * (1 << 13) / 255) & 0x1fff;

		I915_WRITE(PIPE_CSC_POSTOFF_HI(pipe), postoff);
		I915_WRITE(PIPE_CSC_POSTOFF_ME(pipe), postoff);
		I915_WRITE(PIPE_CSC_POSTOFF_LO(pipe), postoff);

		I915_WRITE(PIPE_CSC_MODE(pipe), 0);
	} else {
		uint32_t mode = CSC_MODE_YUV_TO_RGB;

		if (adjusted_mode->private_flags & INTEL_MODE_LIMITED_COLOR_RANGE)
			mode |= CSC_BLACK_SCREEN_OFFSET;

		I915_WRITE(PIPE_CSC_MODE(pipe), mode);
	}
}

static void haswell_set_pipeconf(struct drm_crtc *crtc,
				 struct drm_display_mode *adjusted_mode,
				 bool dither)
{
	struct drm_i915_private *dev_priv = crtc->dev->dev_private;
	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
	enum transcoder cpu_transcoder = intel_crtc->cpu_transcoder;
	uint32_t val;

	val = I915_READ(PIPECONF(cpu_transcoder));

	val &= ~(PIPECONF_DITHER_EN | PIPECONF_DITHER_TYPE_MASK);
	if (dither)
		val |= (PIPECONF_DITHER_EN | PIPECONF_DITHER_TYPE_SP);

	val &= ~PIPECONF_INTERLACE_MASK_HSW;
	if (adjusted_mode->flags & DRM_MODE_FLAG_INTERLACE)
		val |= PIPECONF_INTERLACED_ILK;
	else
		val |= PIPECONF_PROGRESSIVE;

	I915_WRITE(PIPECONF(cpu_transcoder), val);
	POSTING_READ(PIPECONF(cpu_transcoder));
}

static bool ironlake_compute_clocks(struct drm_crtc *crtc,
				    struct drm_display_mode *adjusted_mode,
				    intel_clock_t *clock,
				    bool *has_reduced_clock,
				    intel_clock_t *reduced_clock)
{
	struct drm_device *dev = crtc->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_encoder *intel_encoder;
	int refclk;
	const intel_limit_t *limit;
	bool ret, is_sdvo = false, is_tv = false, is_lvds = false;

	for_each_encoder_on_crtc(dev, crtc, intel_encoder) {
		switch (intel_encoder->type) {
		case INTEL_OUTPUT_LVDS:
			is_lvds = true;
			break;
		case INTEL_OUTPUT_SDVO:
		case INTEL_OUTPUT_HDMI:
			is_sdvo = true;
			if (intel_encoder->needs_tv_clock)
				is_tv = true;
			break;
		case INTEL_OUTPUT_TVOUT:
			is_tv = true;
			break;
		}
	}

	refclk = ironlake_get_refclk(crtc);

	/*
	 * Returns a set of divisors for the desired target clock with the given
	 * refclk, or FALSE.  The returned values represent the clock equation:
	 * reflck * (5 * (m1 + 2) + (m2 + 2)) / (n + 2) / p1 / p2.
	 */
	limit = intel_limit(crtc, refclk);
	ret = limit->find_pll(limit, crtc, adjusted_mode->clock, refclk, NULL,
			      clock);
	if (!ret)
		return false;

	if (is_lvds && dev_priv->lvds_downclock_avail) {
		/*
		 * Ensure we match the reduced clock's P to the target clock.
		 * If the clocks don't match, we can't switch the display clock
		 * by using the FP0/FP1. In such case we will disable the LVDS
		 * downclock feature.
		*/
		*has_reduced_clock = limit->find_pll(limit, crtc,
						     dev_priv->lvds_downclock,
						     refclk,
						     clock,
						     reduced_clock);
	}

	if (is_sdvo && is_tv)
		i9xx_adjust_sdvo_tv_clock(adjusted_mode, clock);

	return true;
}

static void cpt_enable_fdi_bc_bifurcation(struct drm_device *dev)
{
	struct drm_i915_private *dev_priv = dev->dev_private;
	uint32_t temp;

	temp = I915_READ(SOUTH_CHICKEN1);
	if (temp & FDI_BC_BIFURCATION_SELECT)
		return;

	WARN_ON(I915_READ(FDI_RX_CTL(PIPE_B)) & FDI_RX_ENABLE);
	WARN_ON(I915_READ(FDI_RX_CTL(PIPE_C)) & FDI_RX_ENABLE);

	temp |= FDI_BC_BIFURCATION_SELECT;
	DRM_DEBUG_KMS("enabling fdi C rx\n");
	I915_WRITE(SOUTH_CHICKEN1, temp);
	POSTING_READ(SOUTH_CHICKEN1);
}

static bool ironlake_check_fdi_lanes(struct intel_crtc *intel_crtc)
{
	struct drm_device *dev = intel_crtc->base.dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_crtc *pipe_B_crtc =
		to_intel_crtc(dev_priv->pipe_to_crtc_mapping[PIPE_B]);

	DRM_DEBUG_KMS("checking fdi config on pipe %i, lanes %i\n",
		      intel_crtc->pipe, intel_crtc->fdi_lanes);
	if (intel_crtc->fdi_lanes > 4) {
		DRM_DEBUG_KMS("invalid fdi lane config on pipe %i: %i lanes\n",
			      intel_crtc->pipe, intel_crtc->fdi_lanes);
		/* Clamp lanes to avoid programming the hw with bogus values. */
		intel_crtc->fdi_lanes = 4;

		return false;
	}

	if (dev_priv->num_pipe == 2)
		return true;

	switch (intel_crtc->pipe) {
	case PIPE_A:
		return true;
	case PIPE_B:
		if (dev_priv->pipe_to_crtc_mapping[PIPE_C]->enabled &&
		    intel_crtc->fdi_lanes > 2) {
			DRM_DEBUG_KMS("invalid shared fdi lane config on pipe %i: %i lanes\n",
				      intel_crtc->pipe, intel_crtc->fdi_lanes);
			/* Clamp lanes to avoid programming the hw with bogus values. */
			intel_crtc->fdi_lanes = 2;

			return false;
		}

		if (intel_crtc->fdi_lanes > 2)
			WARN_ON(I915_READ(SOUTH_CHICKEN1) & FDI_BC_BIFURCATION_SELECT);
		else
			cpt_enable_fdi_bc_bifurcation(dev);

		return true;
	case PIPE_C:
		if (!pipe_B_crtc->base.enabled || pipe_B_crtc->fdi_lanes <= 2) {
			if (intel_crtc->fdi_lanes > 2) {
				DRM_DEBUG_KMS("invalid shared fdi lane config on pipe %i: %i lanes\n",
					      intel_crtc->pipe, intel_crtc->fdi_lanes);
				/* Clamp lanes to avoid programming the hw with bogus values. */
				intel_crtc->fdi_lanes = 2;

				return false;
			}
		} else {
			DRM_DEBUG_KMS("fdi link B uses too many lanes to enable link C\n");
			return false;
		}

		cpt_enable_fdi_bc_bifurcation(dev);

		return true;
	default:
		BUG();
	}
}

int ironlake_get_lanes_required(int target_clock, int link_bw, int bpp)
{
	/*
	 * Account for spread spectrum to avoid
	 * oversubscribing the link. Max center spread
	 * is 2.5%; use 5% for safety's sake.
	 */
	u32 bps = target_clock * bpp * 21 / 20;
	return bps / (link_bw * 8) + 1;
}

static void ironlake_set_m_n(struct drm_crtc *crtc,
			     struct drm_display_mode *mode,
			     struct drm_display_mode *adjusted_mode)
{
	struct drm_device *dev = crtc->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
	enum transcoder cpu_transcoder = intel_crtc->cpu_transcoder;
	struct intel_encoder *intel_encoder, *edp_encoder = NULL;
	struct intel_link_m_n m_n = {0};
	int target_clock, pixel_multiplier, lane, link_bw;
	bool is_dp = false, is_cpu_edp = false;

	for_each_encoder_on_crtc(dev, crtc, intel_encoder) {
		switch (intel_encoder->type) {
		case INTEL_OUTPUT_DISPLAYPORT:
			is_dp = true;
			break;
		case INTEL_OUTPUT_EDP:
			is_dp = true;
			if (!intel_encoder_is_pch_edp(&intel_encoder->base))
				is_cpu_edp = true;
			edp_encoder = intel_encoder;
			break;
		}
	}

	/* FDI link */
	pixel_multiplier = intel_mode_get_pixel_multiplier(adjusted_mode);
	lane = 0;
	/* CPU eDP doesn't require FDI link, so just set DP M/N
	   according to current link config */
	if (is_cpu_edp) {
		intel_edp_link_config(edp_encoder, &lane, &link_bw);
	} else {
		/* FDI is a binary signal running at ~2.7GHz, encoding
		 * each output octet as 10 bits. The actual frequency
		 * is stored as a divider into a 100MHz clock, and the
		 * mode pixel clock is stored in units of 1KHz.
		 * Hence the bw of each lane in terms of the mode signal
		 * is:
		 */
		link_bw = intel_fdi_link_freq(dev) * MHz(100)/KHz(1)/10;
	}

	/* [e]DP over FDI requires target mode clock instead of link clock. */
	if (edp_encoder)
		target_clock = intel_edp_target_clock(edp_encoder, mode);
	else if (is_dp)
		target_clock = mode->clock;
	else
		target_clock = adjusted_mode->clock;

	if (!lane)
		lane = ironlake_get_lanes_required(target_clock, link_bw,
						   intel_crtc->bpp);

	intel_crtc->fdi_lanes = lane;

	if (pixel_multiplier > 1)
		link_bw *= pixel_multiplier;
	intel_link_compute_m_n(intel_crtc->bpp, lane, target_clock, link_bw, &m_n);

	I915_WRITE(PIPE_DATA_M1(cpu_transcoder), TU_SIZE(m_n.tu) | m_n.gmch_m);
	I915_WRITE(PIPE_DATA_N1(cpu_transcoder), m_n.gmch_n);
	I915_WRITE(PIPE_LINK_M1(cpu_transcoder), m_n.link_m);
	I915_WRITE(PIPE_LINK_N1(cpu_transcoder), m_n.link_n);
}

static uint32_t ironlake_compute_dpll(struct intel_crtc *intel_crtc,
				      struct drm_display_mode *adjusted_mode,
				      intel_clock_t *clock, u32 fp)
{
	struct drm_crtc *crtc = &intel_crtc->base;
	struct drm_device *dev = crtc->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_encoder *intel_encoder;
	uint32_t dpll;
	int factor, pixel_multiplier, num_connectors = 0;
	bool is_lvds = false, is_sdvo = false, is_tv = false;
	bool is_dp = false, is_cpu_edp = false;

	for_each_encoder_on_crtc(dev, crtc, intel_encoder) {
		switch (intel_encoder->type) {
		case INTEL_OUTPUT_LVDS:
			is_lvds = true;
			break;
		case INTEL_OUTPUT_SDVO:
		case INTEL_OUTPUT_HDMI:
			is_sdvo = true;
			if (intel_encoder->needs_tv_clock)
				is_tv = true;
			break;
		case INTEL_OUTPUT_TVOUT:
			is_tv = true;
			break;
		case INTEL_OUTPUT_DISPLAYPORT:
			is_dp = true;
			break;
		case INTEL_OUTPUT_EDP:
			is_dp = true;
			if (!intel_encoder_is_pch_edp(&intel_encoder->base))
				is_cpu_edp = true;
			break;
		}

		num_connectors++;
	}

	/* Enable autotuning of the PLL clock (if permissible) */
	factor = 21;
	if (is_lvds) {
		if ((intel_panel_use_ssc(dev_priv) &&
		     dev_priv->lvds_ssc_freq == 100) ||
		    intel_is_dual_link_lvds(dev))
			factor = 25;
	} else if (is_sdvo && is_tv)
		factor = 20;

	if (clock->m < factor * clock->n)
		fp |= FP_CB_TUNE;

	dpll = 0;

	if (is_lvds)
		dpll |= DPLLB_MODE_LVDS;
	else
		dpll |= DPLLB_MODE_DAC_SERIAL;
	if (is_sdvo) {
		pixel_multiplier = intel_mode_get_pixel_multiplier(adjusted_mode);
		if (pixel_multiplier > 1) {
			dpll |= (pixel_multiplier - 1) << PLL_REF_SDVO_HDMI_MULTIPLIER_SHIFT;
		}
		dpll |= DPLL_DVO_HIGH_SPEED;
	}
	if (is_dp && !is_cpu_edp)
		dpll |= DPLL_DVO_HIGH_SPEED;

	/* compute bitmask from p1 value */
	dpll |= (1 << (clock->p1 - 1)) << DPLL_FPA01_P1_POST_DIV_SHIFT;
	/* also FPA1 */
	dpll |= (1 << (clock->p1 - 1)) << DPLL_FPA1_P1_POST_DIV_SHIFT;

	switch (clock->p2) {
	case 5:
		dpll |= DPLL_DAC_SERIAL_P2_CLOCK_DIV_5;
		break;
	case 7:
		dpll |= DPLLB_LVDS_P2_CLOCK_DIV_7;
		break;
	case 10:
		dpll |= DPLL_DAC_SERIAL_P2_CLOCK_DIV_10;
		break;
	case 14:
		dpll |= DPLLB_LVDS_P2_CLOCK_DIV_14;
		break;
	}

	if (is_sdvo && is_tv)
		dpll |= PLL_REF_INPUT_TVCLKINBC;
	else if (is_tv)
		/* XXX: just matching BIOS for now */
		/*	dpll |= PLL_REF_INPUT_TVCLKINBC; */
		dpll |= 3;
	else if (is_lvds && intel_panel_use_ssc(dev_priv) && num_connectors < 2)
		dpll |= PLLB_REF_INPUT_SPREADSPECTRUMIN;
	else
		dpll |= PLL_REF_INPUT_DREFCLK;

	return dpll;
}

static int ironlake_crtc_mode_set(struct drm_crtc *crtc,
				  struct drm_display_mode *mode,
				  struct drm_display_mode *adjusted_mode,
				  int x, int y,
				  struct drm_framebuffer *fb)
{
	struct drm_device *dev = crtc->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
	int pipe = intel_crtc->pipe;
	int plane = intel_crtc->plane;
	int num_connectors = 0;
	intel_clock_t clock, reduced_clock;
	u32 dpll, fp = 0, fp2 = 0;
	bool ok, has_reduced_clock = false;
	bool is_lvds = false, is_dp = false, is_cpu_edp = false;
	struct intel_encoder *encoder;
	int ret;
	bool dither, fdi_config_ok;

	for_each_encoder_on_crtc(dev, crtc, encoder) {
		switch (encoder->type) {
		case INTEL_OUTPUT_LVDS:
			is_lvds = true;
			break;
		case INTEL_OUTPUT_DISPLAYPORT:
			is_dp = true;
			break;
		case INTEL_OUTPUT_EDP:
			is_dp = true;
			if (!intel_encoder_is_pch_edp(&encoder->base))
				is_cpu_edp = true;
			break;
		}

		num_connectors++;
	}

	WARN(!(HAS_PCH_IBX(dev) || HAS_PCH_CPT(dev)),
	     "Unexpected PCH type %d\n", INTEL_PCH_TYPE(dev));

	ok = ironlake_compute_clocks(crtc, adjusted_mode, &clock,
				     &has_reduced_clock, &reduced_clock);
	if (!ok) {
		DRM_ERROR("Couldn't find PLL settings for mode!\n");
		return -EINVAL;
	}

	/* Ensure that the cursor is valid for the new mode before changing... */
	intel_crtc_update_cursor(crtc, true);

	/* determine panel color depth */
	dither = intel_choose_pipe_bpp_dither(crtc, fb, &intel_crtc->bpp,
					      adjusted_mode);
	if (is_lvds && dev_priv->lvds_dither)
		dither = true;

	fp = clock.n << 16 | clock.m1 << 8 | clock.m2;
	if (has_reduced_clock)
		fp2 = reduced_clock.n << 16 | reduced_clock.m1 << 8 |
			reduced_clock.m2;

	dpll = ironlake_compute_dpll(intel_crtc, adjusted_mode, &clock, fp);

	DRM_DEBUG_KMS("Mode for pipe %d:\n", pipe);
	drm_mode_debug_printmodeline(mode);

	/* CPU eDP is the only output that doesn't need a PCH PLL of its own. */
	if (!is_cpu_edp) {
		struct intel_pch_pll *pll;

		pll = intel_get_pch_pll(intel_crtc, dpll, fp);
		if (pll == NULL) {
			DRM_DEBUG_DRIVER("failed to find PLL for pipe %d\n",
					 pipe);
			return -EINVAL;
		}
	} else
		intel_put_pch_pll(intel_crtc);

	if (is_dp && !is_cpu_edp)
		intel_dp_set_m_n(crtc, mode, adjusted_mode);

	for_each_encoder_on_crtc(dev, crtc, encoder)
		if (encoder->pre_pll_enable)
			encoder->pre_pll_enable(encoder);

	if (intel_crtc->pch_pll) {
		I915_WRITE(intel_crtc->pch_pll->pll_reg, dpll);

		/* Wait for the clocks to stabilize. */
		POSTING_READ(intel_crtc->pch_pll->pll_reg);
		udelay(150);

		/* The pixel multiplier can only be updated once the
		 * DPLL is enabled and the clocks are stable.
		 *
		 * So write it again.
		 */
		I915_WRITE(intel_crtc->pch_pll->pll_reg, dpll);
	}

	intel_crtc->lowfreq_avail = false;
	if (intel_crtc->pch_pll) {
		if (is_lvds && has_reduced_clock && i915_powersave) {
			I915_WRITE(intel_crtc->pch_pll->fp1_reg, fp2);
			intel_crtc->lowfreq_avail = true;
		} else {
			I915_WRITE(intel_crtc->pch_pll->fp1_reg, fp);
		}
	}

	intel_set_pipe_timings(intel_crtc, mode, adjusted_mode);

	/* Note, this also computes intel_crtc->fdi_lanes which is used below in
	 * ironlake_check_fdi_lanes. */
	ironlake_set_m_n(crtc, mode, adjusted_mode);

	fdi_config_ok = ironlake_check_fdi_lanes(intel_crtc);

	ironlake_set_pipeconf(crtc, adjusted_mode, dither);

	intel_wait_for_vblank(dev, pipe);

	/* Set up the display plane register */
	I915_WRITE(DSPCNTR(plane), DISPPLANE_GAMMA_ENABLE);
	POSTING_READ(DSPCNTR(plane));

	ret = intel_pipe_set_base(crtc, x, y, fb);

	intel_update_watermarks(dev);

	intel_update_linetime_watermarks(dev, pipe, adjusted_mode);

	return fdi_config_ok ? ret : -EINVAL;
}

static void haswell_modeset_global_resources(struct drm_device *dev)
{
	struct drm_i915_private *dev_priv = dev->dev_private;
	bool enable = false;
	struct intel_crtc *crtc;
	struct intel_encoder *encoder;

	list_for_each_entry(crtc, &dev->mode_config.crtc_list, base.head) {
		if (crtc->pipe != PIPE_A && crtc->base.enabled)
			enable = true;
		/* XXX: Should check for edp transcoder here, but thanks to init
		 * sequence that's not yet available. Just in case desktop eDP
		 * on PORT D is possible on haswell, too. */
	}

	list_for_each_entry(encoder, &dev->mode_config.encoder_list,
			    base.head) {
		if (encoder->type != INTEL_OUTPUT_EDP &&
		    encoder->connectors_active)
			enable = true;
	}

	/* Even the eDP panel fitter is outside the always-on well. */
	if (dev_priv->pch_pf_size)
		enable = true;

	intel_set_power_well(dev, enable);
}

static int haswell_crtc_mode_set(struct drm_crtc *crtc,
				 struct drm_display_mode *mode,
				 struct drm_display_mode *adjusted_mode,
				 int x, int y,
				 struct drm_framebuffer *fb)
{
	struct drm_device *dev = crtc->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
	int pipe = intel_crtc->pipe;
	int plane = intel_crtc->plane;
	int num_connectors = 0;
	bool is_dp = false, is_cpu_edp = false;
	struct intel_encoder *encoder;
	int ret;
	bool dither;

	for_each_encoder_on_crtc(dev, crtc, encoder) {
		switch (encoder->type) {
		case INTEL_OUTPUT_DISPLAYPORT:
			is_dp = true;
			break;
		case INTEL_OUTPUT_EDP:
			is_dp = true;
			if (!intel_encoder_is_pch_edp(&encoder->base))
				is_cpu_edp = true;
			break;
		}

		num_connectors++;
	}

	/* We are not sure yet this won't happen. */
	WARN(!HAS_PCH_LPT(dev), "Unexpected PCH type %d\n",
	     INTEL_PCH_TYPE(dev));

	WARN(num_connectors != 1, "%d connectors attached to pipe %c\n",
	     num_connectors, pipe_name(pipe));

	WARN_ON(I915_READ(PIPECONF(intel_crtc->cpu_transcoder)) &
		(PIPECONF_ENABLE | I965_PIPECONF_ACTIVE));

	WARN_ON(I915_READ(DSPCNTR(plane)) & DISPLAY_PLANE_ENABLE);

	if (!intel_ddi_pll_mode_set(crtc, adjusted_mode->clock))
		return -EINVAL;

	/* Ensure that the cursor is valid for the new mode before changing... */
	intel_crtc_update_cursor(crtc, true);

	/* determine panel color depth */
	dither = intel_choose_pipe_bpp_dither(crtc, fb, &intel_crtc->bpp,
					      adjusted_mode);

	DRM_DEBUG_KMS("Mode for pipe %d:\n", pipe);
	drm_mode_debug_printmodeline(mode);

	if (is_dp && !is_cpu_edp)
		intel_dp_set_m_n(crtc, mode, adjusted_mode);

	intel_crtc->lowfreq_avail = false;

	intel_set_pipe_timings(intel_crtc, mode, adjusted_mode);

	if (!is_dp || is_cpu_edp)
		ironlake_set_m_n(crtc, mode, adjusted_mode);

	haswell_set_pipeconf(crtc, adjusted_mode, dither);

	intel_set_pipe_csc(crtc, adjusted_mode);

	/* Set up the display plane register */
	I915_WRITE(DSPCNTR(plane), DISPPLANE_GAMMA_ENABLE | DISPPLANE_PIPE_CSC_ENABLE);
	POSTING_READ(DSPCNTR(plane));

	ret = intel_pipe_set_base(crtc, x, y, fb);

	intel_update_watermarks(dev);

	intel_update_linetime_watermarks(dev, pipe, adjusted_mode);

	return ret;
}

static int intel_crtc_mode_set(struct drm_crtc *crtc,
			       struct drm_display_mode *mode,
			       struct drm_display_mode *adjusted_mode,
			       int x, int y,
			       struct drm_framebuffer *fb)
{
	struct drm_device *dev = crtc->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct drm_encoder_helper_funcs *encoder_funcs;
	struct intel_encoder *encoder;
	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
	int pipe = intel_crtc->pipe;
	int ret;

	if (IS_HASWELL(dev) && intel_pipe_has_type(crtc, INTEL_OUTPUT_EDP))
		intel_crtc->cpu_transcoder = TRANSCODER_EDP;
	else
		intel_crtc->cpu_transcoder = pipe;

	drm_vblank_pre_modeset(dev, pipe);

	ret = dev_priv->display.crtc_mode_set(crtc, mode, adjusted_mode,
					      x, y, fb);
	drm_vblank_post_modeset(dev, pipe);

	if (ret != 0)
		return ret;

	for_each_encoder_on_crtc(dev, crtc, encoder) {
		DRM_DEBUG_KMS("[ENCODER:%d:%s] set [MODE:%d:%s]\n",
			encoder->base.base.id,
			drm_get_encoder_name(&encoder->base),
			mode->base.id, mode->name);
		encoder_funcs = encoder->base.helper_private;
		encoder_funcs->mode_set(&encoder->base, mode, adjusted_mode);
	}

	return 0;
}

static bool intel_eld_uptodate(struct drm_connector *connector,
			       int reg_eldv, uint32_t bits_eldv,
			       int reg_elda, uint32_t bits_elda,
			       int reg_edid)
{
	struct drm_i915_private *dev_priv = connector->dev->dev_private;
	uint8_t *eld = connector->eld;
	uint32_t i;

	i = I915_READ(reg_eldv);
	i &= bits_eldv;

	if (!eld[0])
		return !i;

	if (!i)
		return false;

	i = I915_READ(reg_elda);
	i &= ~bits_elda;
	I915_WRITE(reg_elda, i);

	for (i = 0; i < eld[2]; i++)
		if (I915_READ(reg_edid) != *((uint32_t *)eld + i))
			return false;

	return true;
}

static void g4x_write_eld(struct drm_connector *connector,
			  struct drm_crtc *crtc)
{
	struct drm_i915_private *dev_priv = connector->dev->dev_private;
	uint8_t *eld = connector->eld;
	uint32_t eldv;
	uint32_t len;
	uint32_t i;

	i = I915_READ(G4X_AUD_VID_DID);

	if (i == INTEL_AUDIO_DEVBLC || i == INTEL_AUDIO_DEVCL)
		eldv = G4X_ELDV_DEVCL_DEVBLC;
	else
		eldv = G4X_ELDV_DEVCTG;

	if (intel_eld_uptodate(connector,
			       G4X_AUD_CNTL_ST, eldv,
			       G4X_AUD_CNTL_ST, G4X_ELD_ADDR,
			       G4X_HDMIW_HDMIEDID))
		return;

	i = I915_READ(G4X_AUD_CNTL_ST);
	i &= ~(eldv | G4X_ELD_ADDR);
	len = (i >> 9) & 0x1f;		/* ELD buffer size */
	I915_WRITE(G4X_AUD_CNTL_ST, i);

	if (!eld[0])
		return;

	len = min_t(uint8_t, eld[2], len);
	DRM_DEBUG_DRIVER("ELD size %d\n", len);
	for (i = 0; i < len; i++)
		I915_WRITE(G4X_HDMIW_HDMIEDID, *((uint32_t *)eld + i));

	i = I915_READ(G4X_AUD_CNTL_ST);
	i |= eldv;
	I915_WRITE(G4X_AUD_CNTL_ST, i);
}

static void haswell_write_eld(struct drm_connector *connector,
				     struct drm_crtc *crtc)
{
	struct drm_i915_private *dev_priv = connector->dev->dev_private;
	uint8_t *eld = connector->eld;
	struct drm_device *dev = crtc->dev;
	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
	uint32_t eldv;
	uint32_t i;
	int len;
	int pipe = to_intel_crtc(crtc)->pipe;
	int tmp;

	int hdmiw_hdmiedid = HSW_AUD_EDID_DATA(pipe);
	int aud_cntl_st = HSW_AUD_DIP_ELD_CTRL(pipe);
	int aud_config = HSW_AUD_CFG(pipe);
	int aud_cntrl_st2 = HSW_AUD_PIN_ELD_CP_VLD;


	DRM_DEBUG_DRIVER("HDMI: Haswell Audio initialize....\n");

	/* Audio output enable */
	DRM_DEBUG_DRIVER("HDMI audio: enable codec\n");
	tmp = I915_READ(aud_cntrl_st2);
	tmp |= (AUDIO_OUTPUT_ENABLE_A << (pipe * 4));
	I915_WRITE(aud_cntrl_st2, tmp);

	/* Wait for 1 vertical blank */
	intel_wait_for_vblank(dev, pipe);

	/* Set ELD valid state */
	tmp = I915_READ(aud_cntrl_st2);
	DRM_DEBUG_DRIVER("HDMI audio: pin eld vld status=0x%8x\n", tmp);
	tmp |= (AUDIO_ELD_VALID_A << (pipe * 4));
	I915_WRITE(aud_cntrl_st2, tmp);
	tmp = I915_READ(aud_cntrl_st2);
	DRM_DEBUG_DRIVER("HDMI audio: eld vld status=0x%8x\n", tmp);

	/* Enable HDMI mode */
	tmp = I915_READ(aud_config);
	DRM_DEBUG_DRIVER("HDMI audio: audio conf: 0x%8x\n", tmp);
	/* clear N_programing_enable and N_value_index */
	tmp &= ~(AUD_CONFIG_N_VALUE_INDEX | AUD_CONFIG_N_PROG_ENABLE);
	I915_WRITE(aud_config, tmp);

	DRM_DEBUG_DRIVER("ELD on pipe %c\n", pipe_name(pipe));

	eldv = AUDIO_ELD_VALID_A << (pipe * 4);
	intel_crtc->eld_vld = true;

	if (intel_pipe_has_type(crtc, INTEL_OUTPUT_DISPLAYPORT)) {
		DRM_DEBUG_DRIVER("ELD: DisplayPort detected\n");
		eld[5] |= (1 << 2);	/* Conn_Type, 0x1 = DisplayPort */
		I915_WRITE(aud_config, AUD_CONFIG_N_VALUE_INDEX); /* 0x1 = DP */
	} else
		I915_WRITE(aud_config, 0);

	if (intel_eld_uptodate(connector,
			       aud_cntrl_st2, eldv,
			       aud_cntl_st, IBX_ELD_ADDRESS,
			       hdmiw_hdmiedid))
		return;

	i = I915_READ(aud_cntrl_st2);
	i &= ~eldv;
	I915_WRITE(aud_cntrl_st2, i);

	if (!eld[0])
		return;

	i = I915_READ(aud_cntl_st);
	i &= ~IBX_ELD_ADDRESS;
	I915_WRITE(aud_cntl_st, i);
	i = (i >> 29) & DIP_PORT_SEL_MASK;		/* DIP_Port_Select, 0x1 = PortB */
	DRM_DEBUG_DRIVER("port num:%d\n", i);

	len = min_t(uint8_t, eld[2], 21);	/* 84 bytes of hw ELD buffer */
	DRM_DEBUG_DRIVER("ELD size %d\n", len);
	for (i = 0; i < len; i++)
		I915_WRITE(hdmiw_hdmiedid, *((uint32_t *)eld + i));

	i = I915_READ(aud_cntrl_st2);
	i |= eldv;
	I915_WRITE(aud_cntrl_st2, i);

}

static void ironlake_write_eld(struct drm_connector *connector,
				     struct drm_crtc *crtc)
{
	struct drm_i915_private *dev_priv = connector->dev->dev_private;
	uint8_t *eld = connector->eld;
	uint32_t eldv;
	uint32_t i;
	int len;
	int hdmiw_hdmiedid;
	int aud_config;
	int aud_cntl_st;
	int aud_cntrl_st2;
	int pipe = to_intel_crtc(crtc)->pipe;

	if (HAS_PCH_IBX(connector->dev)) {
		hdmiw_hdmiedid = IBX_HDMIW_HDMIEDID(pipe);
		aud_config = IBX_AUD_CFG(pipe);
		aud_cntl_st = IBX_AUD_CNTL_ST(pipe);
		aud_cntrl_st2 = IBX_AUD_CNTL_ST2;
	} else {
		hdmiw_hdmiedid = CPT_HDMIW_HDMIEDID(pipe);
		aud_config = CPT_AUD_CFG(pipe);
		aud_cntl_st = CPT_AUD_CNTL_ST(pipe);
		aud_cntrl_st2 = CPT_AUD_CNTRL_ST2;
	}

	DRM_DEBUG_DRIVER("ELD on pipe %c\n", pipe_name(pipe));

	i = I915_READ(aud_cntl_st);
	i = (i >> 29) & DIP_PORT_SEL_MASK;		/* DIP_Port_Select, 0x1 = PortB */
	if (!i) {
		DRM_DEBUG_DRIVER("Audio directed to unknown port\n");
		/* operate blindly on all ports */
		eldv = IBX_ELD_VALIDB;
		eldv |= IBX_ELD_VALIDB << 4;
		eldv |= IBX_ELD_VALIDB << 8;
	} else {
		DRM_DEBUG_DRIVER("ELD on port %c\n", 'A' + i);
		eldv = IBX_ELD_VALIDB << ((i - 1) * 4);
	}

	if (intel_pipe_has_type(crtc, INTEL_OUTPUT_DISPLAYPORT)) {
		DRM_DEBUG_DRIVER("ELD: DisplayPort detected\n");
		eld[5] |= (1 << 2);	/* Conn_Type, 0x1 = DisplayPort */
		I915_WRITE(aud_config, AUD_CONFIG_N_VALUE_INDEX); /* 0x1 = DP */
	} else
		I915_WRITE(aud_config, 0);

	if (intel_eld_uptodate(connector,
			       aud_cntrl_st2, eldv,
			       aud_cntl_st, IBX_ELD_ADDRESS,
			       hdmiw_hdmiedid))
		return;

	i = I915_READ(aud_cntrl_st2);
	i &= ~eldv;
	I915_WRITE(aud_cntrl_st2, i);

	if (!eld[0])
		return;

	i = I915_READ(aud_cntl_st);
	i &= ~IBX_ELD_ADDRESS;
	I915_WRITE(aud_cntl_st, i);

	len = min_t(uint8_t, eld[2], 21);	/* 84 bytes of hw ELD buffer */
	DRM_DEBUG_DRIVER("ELD size %d\n", len);
	for (i = 0; i < len; i++)
		I915_WRITE(hdmiw_hdmiedid, *((uint32_t *)eld + i));

	i = I915_READ(aud_cntrl_st2);
	i |= eldv;
	I915_WRITE(aud_cntrl_st2, i);
}

void intel_write_eld(struct drm_encoder *encoder,
		     struct drm_display_mode *mode)
{
	struct drm_crtc *crtc = encoder->crtc;
	struct drm_connector *connector;
	struct drm_device *dev = encoder->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;

	connector = drm_select_eld(encoder, mode);
	if (!connector)
		return;

	DRM_DEBUG_DRIVER("ELD on [CONNECTOR:%d:%s], [ENCODER:%d:%s]\n",
			 connector->base.id,
			 drm_get_connector_name(connector),
			 connector->encoder->base.id,
			 drm_get_encoder_name(connector->encoder));

	connector->eld[6] = drm_av_sync_delay(connector, mode) / 2;

	if (dev_priv->display.write_eld)
		dev_priv->display.write_eld(connector, crtc);
}

/** Loads the palette/gamma unit for the CRTC with the prepared values */
void intel_crtc_load_lut(struct drm_crtc *crtc)
{
	struct drm_device *dev = crtc->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
	int palreg = PALETTE(intel_crtc->pipe);
	int i;

	/* The clocks have to be on to load the palette. */
	if (!crtc->enabled || !intel_crtc->active)
		return;

	/* use legacy palette for Ironlake */
	if (HAS_PCH_SPLIT(dev))
		palreg = LGC_PALETTE(intel_crtc->pipe);

	for (i = 0; i < 256; i++) {
		I915_WRITE(palreg + 4 * i,
			   (intel_crtc->lut_r[i] << 16) |
			   (intel_crtc->lut_g[i] << 8) |
			   intel_crtc->lut_b[i]);
	}
}

static void i845_update_cursor(struct drm_crtc *crtc, u32 base)
{
	struct drm_device *dev = crtc->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
	bool visible = base != 0;
	u32 cntl;

	if (intel_crtc->cursor_visible == visible)
		return;

	cntl = I915_READ(_CURACNTR);
	if (visible) {
		/* On these chipsets we can only modify the base whilst
		 * the cursor is disabled.
		 */
		I915_WRITE(_CURABASE, base);

		cntl &= ~(CURSOR_FORMAT_MASK);
		/* XXX width must be 64, stride 256 => 0x00 << 28 */
		cntl |= CURSOR_ENABLE |
			CURSOR_GAMMA_ENABLE |
			CURSOR_FORMAT_ARGB;
	} else
		cntl &= ~(CURSOR_ENABLE | CURSOR_GAMMA_ENABLE);
	I915_WRITE(_CURACNTR, cntl);

	intel_crtc->cursor_visible = visible;
}

static void i9xx_update_cursor(struct drm_crtc *crtc, u32 base)
{
	struct drm_device *dev = crtc->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
	int pipe = intel_crtc->pipe;
	bool visible = base != 0;

	if (intel_crtc->cursor_visible != visible) {
		uint32_t cntl = I915_READ(CURCNTR(pipe));
		if (base) {
			cntl &= ~(CURSOR_MODE | MCURSOR_PIPE_SELECT);
			cntl |= CURSOR_MODE_64_ARGB_AX | MCURSOR_GAMMA_ENABLE;
			cntl |= pipe << 28; /* Connect to correct pipe */
		} else {
			cntl &= ~(CURSOR_MODE | MCURSOR_GAMMA_ENABLE);
			cntl |= CURSOR_MODE_DISABLE;
		}
		I915_WRITE(CURCNTR(pipe), cntl);

		intel_crtc->cursor_visible = visible;
	}
	/* and commit changes on next vblank */
	I915_WRITE(CURBASE(pipe), base);
}

static void ivb_update_cursor(struct drm_crtc *crtc, u32 base)
{
	struct drm_device *dev = crtc->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
	int pipe = intel_crtc->pipe;
	bool visible = base != 0;

	if (intel_crtc->cursor_visible != visible) {
		uint32_t cntl = I915_READ(CURCNTR_IVB(pipe));
		if (base) {
			cntl &= ~CURSOR_MODE;
			cntl |= CURSOR_MODE_64_ARGB_AX | MCURSOR_GAMMA_ENABLE;
		} else {
			cntl &= ~(CURSOR_MODE | MCURSOR_GAMMA_ENABLE);
			cntl |= CURSOR_MODE_DISABLE;
		}
		if (IS_HASWELL(dev))
			cntl |= CURSOR_PIPE_CSC_ENABLE;
		I915_WRITE(CURCNTR_IVB(pipe), cntl);

		intel_crtc->cursor_visible = visible;
	}
	/* and commit changes on next vblank */
	I915_WRITE(CURBASE_IVB(pipe), base);
}

/* If no-part of the cursor is visible on the framebuffer, then the GPU may hang... */
static void intel_crtc_update_cursor(struct drm_crtc *crtc,
				     bool on)
{
	struct drm_device *dev = crtc->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
	int pipe = intel_crtc->pipe;
	int x = intel_crtc->cursor_x;
	int y = intel_crtc->cursor_y;
	u32 base, pos;
	bool visible;

	pos = 0;

	if (on && crtc->enabled && crtc->fb) {
		base = intel_crtc->cursor_addr;
		if (x > (int) crtc->fb->width)
			base = 0;

		if (y > (int) crtc->fb->height)
			base = 0;
	} else
		base = 0;

	if (x < 0) {
		if (x + intel_crtc->cursor_width < 0)
			base = 0;

		pos |= CURSOR_POS_SIGN << CURSOR_X_SHIFT;
		x = -x;
	}
	pos |= x << CURSOR_X_SHIFT;

	if (y < 0) {
		if (y + intel_crtc->cursor_height < 0)
			base = 0;

		pos |= CURSOR_POS_SIGN << CURSOR_Y_SHIFT;
		y = -y;
	}
	pos |= y << CURSOR_Y_SHIFT;

	visible = base != 0;
	if (!visible && !intel_crtc->cursor_visible)
		return;

	if (IS_IVYBRIDGE(dev) || IS_HASWELL(dev)) {
		I915_WRITE(CURPOS_IVB(pipe), pos);
		ivb_update_cursor(crtc, base);
	} else {
		I915_WRITE(CURPOS(pipe), pos);
		if (IS_845G(dev) || IS_I865G(dev))
			i845_update_cursor(crtc, base);
		else
			i9xx_update_cursor(crtc, base);
	}
}

static int intel_crtc_cursor_set(struct drm_crtc *crtc,
				 struct drm_file *file,
				 uint32_t handle,
				 uint32_t width, uint32_t height)
{
	struct drm_device *dev = crtc->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
	struct drm_i915_gem_object *obj;
	uint32_t addr;
	int ret;

	/* if we want to turn off the cursor ignore width and height */
	if (!handle) {
		DRM_DEBUG_KMS("cursor off\n");
		addr = 0;
		obj = NULL;
		mutex_lock(&dev->struct_mutex);
		goto finish;
	}

	/* Currently we only support 64x64 cursors */
	if (width != 64 || height != 64) {
		DRM_ERROR("we currently only support 64x64 cursors\n");
		return -EINVAL;
	}

	obj = to_intel_bo(drm_gem_object_lookup(dev, file, handle));
	if (&obj->base == NULL)
		return -ENOENT;

	if (obj->base.size < width * height * 4) {
		DRM_ERROR("buffer is to small\n");
		ret = -ENOMEM;
		goto fail;
	}

	/* we only need to pin inside GTT if cursor is non-phy */
	mutex_lock(&dev->struct_mutex);
	if (!dev_priv->info->cursor_needs_physical) {
		if (obj->tiling_mode) {
			DRM_ERROR("cursor cannot be tiled\n");
			ret = -EINVAL;
			goto fail_locked;
		}

		ret = i915_gem_object_pin_to_display_plane(obj, 0, NULL);
		if (ret) {
			DRM_ERROR("failed to move cursor bo into the GTT\n");
			goto fail_locked;
		}

		ret = i915_gem_object_put_fence(obj);
		if (ret) {
			DRM_ERROR("failed to release fence for cursor");
			goto fail_unpin;
		}

		addr = obj->gtt_offset;
	} else {
		int align = IS_I830(dev) ? 16 * 1024 : 256;
		ret = i915_gem_attach_phys_object(dev, obj,
						  (intel_crtc->pipe == 0) ? I915_GEM_PHYS_CURSOR_0 : I915_GEM_PHYS_CURSOR_1,
						  align);
		if (ret) {
			DRM_ERROR("failed to attach phys object\n");
			goto fail_locked;
		}
		addr = obj->phys_obj->handle->busaddr;
	}

	if (IS_GEN2(dev))
		I915_WRITE(CURSIZE, (height << 12) | width);

 finish:
	if (intel_crtc->cursor_bo) {
		if (dev_priv->info->cursor_needs_physical) {
			if (intel_crtc->cursor_bo != obj)
				i915_gem_detach_phys_object(dev, intel_crtc->cursor_bo);
		} else
			i915_gem_object_unpin(intel_crtc->cursor_bo);
		drm_gem_object_unreference(&intel_crtc->cursor_bo->base);
	}

	mutex_unlock(&dev->struct_mutex);

	intel_crtc->cursor_addr = addr;
	intel_crtc->cursor_bo = obj;
	intel_crtc->cursor_width = width;
	intel_crtc->cursor_height = height;

	intel_crtc_update_cursor(crtc, true);

	return 0;
fail_unpin:
	i915_gem_object_unpin(obj);
fail_locked:
	mutex_unlock(&dev->struct_mutex);
fail:
	drm_gem_object_unreference_unlocked(&obj->base);
	return ret;
}

static int intel_crtc_cursor_move(struct drm_crtc *crtc, int x, int y)
{
	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);

	intel_crtc->cursor_x = x;
	intel_crtc->cursor_y = y;

	intel_crtc_update_cursor(crtc, true);

	return 0;
}

/** Sets the color ramps on behalf of RandR */
void intel_crtc_fb_gamma_set(struct drm_crtc *crtc, u16 red, u16 green,
				 u16 blue, int regno)
{
	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);

	intel_crtc->lut_r[regno] = red >> 8;
	intel_crtc->lut_g[regno] = green >> 8;
	intel_crtc->lut_b[regno] = blue >> 8;
}

void intel_crtc_fb_gamma_get(struct drm_crtc *crtc, u16 *red, u16 *green,
			     u16 *blue, int regno)
{
	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);

	*red = intel_crtc->lut_r[regno] << 8;
	*green = intel_crtc->lut_g[regno] << 8;
	*blue = intel_crtc->lut_b[regno] << 8;
}

static void intel_crtc_gamma_set(struct drm_crtc *crtc, u16 *red, u16 *green,
				 u16 *blue, uint32_t start, uint32_t size)
{
	int end = (start + size > 256) ? 256 : start + size, i;
	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);

	for (i = start; i < end; i++) {
		intel_crtc->lut_r[i] = red[i] >> 8;
		intel_crtc->lut_g[i] = green[i] >> 8;
		intel_crtc->lut_b[i] = blue[i] >> 8;
	}

	intel_crtc_load_lut(crtc);
}

/**
 * Get a pipe with a simple mode set on it for doing load-based monitor
 * detection.
 *
 * It will be up to the load-detect code to adjust the pipe as appropriate for
 * its requirements.  The pipe will be connected to no other encoders.
 *
 * Currently this code will only succeed if there is a pipe with no encoders
 * configured for it.  In the future, it could choose to temporarily disable
 * some outputs to free up a pipe for its use.
 *
 * \return crtc, or NULL if no pipes are available.
 */

/* VESA 640x480x72Hz mode to set on the pipe */
static struct drm_display_mode load_detect_mode = {
	DRM_MODE("640x480", DRM_MODE_TYPE_DEFAULT, 31500, 640, 664,
		 704, 832, 0, 480, 489, 491, 520, 0, DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC),
};

static struct drm_framebuffer *
intel_framebuffer_create(struct drm_device *dev,
			 struct drm_mode_fb_cmd2 *mode_cmd,
			 struct drm_i915_gem_object *obj)
{
	struct intel_framebuffer *intel_fb;
	int ret;

	intel_fb = kzalloc(sizeof(*intel_fb), GFP_KERNEL);
	if (!intel_fb) {
		drm_gem_object_unreference_unlocked(&obj->base);
		return ERR_PTR(-ENOMEM);
	}

	ret = intel_framebuffer_init(dev, intel_fb, mode_cmd, obj);
	if (ret) {
		drm_gem_object_unreference_unlocked(&obj->base);
		kfree(intel_fb);
		return ERR_PTR(ret);
	}

	return &intel_fb->base;
}

static u32
intel_framebuffer_pitch_for_width(int width, int bpp)
{
	u32 pitch = DIV_ROUND_UP(width * bpp, 8);
	return ALIGN(pitch, 64);
}

static u32
intel_framebuffer_size_for_mode(struct drm_display_mode *mode, int bpp)
{
	u32 pitch = intel_framebuffer_pitch_for_width(mode->hdisplay, bpp);
	return ALIGN(pitch * mode->vdisplay, PAGE_SIZE);
}

static struct drm_framebuffer *
intel_framebuffer_create_for_mode(struct drm_device *dev,
				  struct drm_display_mode *mode,
				  int depth, int bpp)
{
	struct drm_i915_gem_object *obj;
	struct drm_mode_fb_cmd2 mode_cmd = { 0 };

	obj = i915_gem_alloc_object(dev,
				    intel_framebuffer_size_for_mode(mode, bpp));
	if (obj == NULL)
		return ERR_PTR(-ENOMEM);

	mode_cmd.width = mode->hdisplay;
	mode_cmd.height = mode->vdisplay;
	mode_cmd.pitches[0] = intel_framebuffer_pitch_for_width(mode_cmd.width,
								bpp);
	mode_cmd.pixel_format = drm_mode_legacy_fb_format(bpp, depth);

	return intel_framebuffer_create(dev, &mode_cmd, obj);
}

static struct drm_framebuffer *
mode_fits_in_fbdev(struct drm_device *dev,
		   struct drm_display_mode *mode)
{
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct drm_i915_gem_object *obj;
	struct drm_framebuffer *fb;

	if (dev_priv->fbdev == NULL)
		return NULL;

	obj = dev_priv->fbdev->ifb.obj;
	if (obj == NULL)
		return NULL;

	fb = &dev_priv->fbdev->ifb.base;
	if (fb->pitches[0] < intel_framebuffer_pitch_for_width(mode->hdisplay,
							       fb->bits_per_pixel))
		return NULL;

	if (obj->base.size < mode->vdisplay * fb->pitches[0])
		return NULL;

	return fb;
}

bool intel_get_load_detect_pipe(struct drm_connector *connector,
				struct drm_display_mode *mode,
				struct intel_load_detect_pipe *old)
{
	struct intel_crtc *intel_crtc;
	struct intel_encoder *intel_encoder =
		intel_attached_encoder(connector);
	struct drm_crtc *possible_crtc;
	struct drm_encoder *encoder = &intel_encoder->base;
	struct drm_crtc *crtc = NULL;
	struct drm_device *dev = encoder->dev;
	struct drm_framebuffer *fb;
	int i = -1;

	DRM_DEBUG_KMS("[CONNECTOR:%d:%s], [ENCODER:%d:%s]\n",
		      connector->base.id, drm_get_connector_name(connector),
		      encoder->base.id, drm_get_encoder_name(encoder));

	/*
	 * Algorithm gets a little messy:
	 *
	 *   - if the connector already has an assigned crtc, use it (but make
	 *     sure it's on first)
	 *
	 *   - try to find the first unused crtc that can drive this connector,
	 *     and use that if we find one
	 */

	/* See if we already have a CRTC for this connector */
	if (encoder->crtc) {
		crtc = encoder->crtc;

		mutex_lock(&crtc->mutex);

		old->dpms_mode = connector->dpms;
		old->load_detect_temp = false;

		/* Make sure the crtc and connector are running */
		if (connector->dpms != DRM_MODE_DPMS_ON)
			connector->funcs->dpms(connector, DRM_MODE_DPMS_ON);

		return true;
	}

	/* Find an unused one (if possible) */
	list_for_each_entry(possible_crtc, &dev->mode_config.crtc_list, head) {
		i++;
		if (!(encoder->possible_crtcs & (1 << i)))
			continue;
		if (!possible_crtc->enabled) {
			crtc = possible_crtc;
			break;
		}
	}

	/*
	 * If we didn't find an unused CRTC, don't use any.
	 */
	if (!crtc) {
		DRM_DEBUG_KMS("no pipe available for load-detect\n");
		return false;
	}

	mutex_lock(&crtc->mutex);
	intel_encoder->new_crtc = to_intel_crtc(crtc);
	to_intel_connector(connector)->new_encoder = intel_encoder;

	intel_crtc = to_intel_crtc(crtc);
	old->dpms_mode = connector->dpms;
	old->load_detect_temp = true;
	old->release_fb = NULL;

	if (!mode)
		mode = &load_detect_mode;

	/* We need a framebuffer large enough to accommodate all accesses
	 * that the plane may generate whilst we perform load detection.
	 * We can not rely on the fbcon either being present (we get called
	 * during its initialisation to detect all boot displays, or it may
	 * not even exist) or that it is large enough to satisfy the
	 * requested mode.
	 */
	fb = mode_fits_in_fbdev(dev, mode);
	if (fb == NULL) {
		DRM_DEBUG_KMS("creating tmp fb for load-detection\n");
		fb = intel_framebuffer_create_for_mode(dev, mode, 24, 32);
		old->release_fb = fb;
	} else
		DRM_DEBUG_KMS("reusing fbdev for load-detection framebuffer\n");
	if (IS_ERR(fb)) {
		DRM_DEBUG_KMS("failed to allocate framebuffer for load-detection\n");
		mutex_unlock(&crtc->mutex);
		return false;
	}

	if (intel_set_mode(crtc, mode, 0, 0, fb)) {
		DRM_DEBUG_KMS("failed to set mode on load-detect pipe\n");
		if (old->release_fb)
			old->release_fb->funcs->destroy(old->release_fb);
		mutex_unlock(&crtc->mutex);
		return false;
	}

	/* let the connector get through one full cycle before testing */
	intel_wait_for_vblank(dev, intel_crtc->pipe);
	return true;
}

void intel_release_load_detect_pipe(struct drm_connector *connector,
				    struct intel_load_detect_pipe *old)
{
	struct intel_encoder *intel_encoder =
		intel_attached_encoder(connector);
	struct drm_encoder *encoder = &intel_encoder->base;
	struct drm_crtc *crtc = encoder->crtc;

	DRM_DEBUG_KMS("[CONNECTOR:%d:%s], [ENCODER:%d:%s]\n",
		      connector->base.id, drm_get_connector_name(connector),
		      encoder->base.id, drm_get_encoder_name(encoder));

	if (old->load_detect_temp) {
		to_intel_connector(connector)->new_encoder = NULL;
		intel_encoder->new_crtc = NULL;
		intel_set_mode(crtc, NULL, 0, 0, NULL);

		if (old->release_fb) {
			drm_framebuffer_unregister_private(old->release_fb);
			drm_framebuffer_unreference(old->release_fb);
		}

		mutex_unlock(&crtc->mutex);
		return;
	}

	/* Switch crtc and encoder back off if necessary */
	if (old->dpms_mode != DRM_MODE_DPMS_ON)
		connector->funcs->dpms(connector, old->dpms_mode);

	mutex_unlock(&crtc->mutex);
}

/* Returns the clock of the currently programmed mode of the given pipe. */
static int intel_crtc_clock_get(struct drm_device *dev, struct drm_crtc *crtc)
{
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
	int pipe = intel_crtc->pipe;
	u32 dpll = I915_READ(DPLL(pipe));
	u32 fp;
	intel_clock_t clock;

	if ((dpll & DISPLAY_RATE_SELECT_FPA1) == 0)
		fp = I915_READ(FP0(pipe));
	else
		fp = I915_READ(FP1(pipe));

	clock.m1 = (fp & FP_M1_DIV_MASK) >> FP_M1_DIV_SHIFT;
	if (IS_PINEVIEW(dev)) {
		clock.n = ffs((fp & FP_N_PINEVIEW_DIV_MASK) >> FP_N_DIV_SHIFT) - 1;
		clock.m2 = (fp & FP_M2_PINEVIEW_DIV_MASK) >> FP_M2_DIV_SHIFT;
	} else {
		clock.n = (fp & FP_N_DIV_MASK) >> FP_N_DIV_SHIFT;
		clock.m2 = (fp & FP_M2_DIV_MASK) >> FP_M2_DIV_SHIFT;
	}

	if (!IS_GEN2(dev)) {
		if (IS_PINEVIEW(dev))
			clock.p1 = ffs((dpll & DPLL_FPA01_P1_POST_DIV_MASK_PINEVIEW) >>
				DPLL_FPA01_P1_POST_DIV_SHIFT_PINEVIEW);
		else
			clock.p1 = ffs((dpll & DPLL_FPA01_P1_POST_DIV_MASK) >>
			       DPLL_FPA01_P1_POST_DIV_SHIFT);

		switch (dpll & DPLL_MODE_MASK) {
		case DPLLB_MODE_DAC_SERIAL:
			clock.p2 = dpll & DPLL_DAC_SERIAL_P2_CLOCK_DIV_5 ?
				5 : 10;
			break;
		case DPLLB_MODE_LVDS:
			clock.p2 = dpll & DPLLB_LVDS_P2_CLOCK_DIV_7 ?
				7 : 14;
			break;
		default:
			DRM_DEBUG_KMS("Unknown DPLL mode %08x in programmed "
				  "mode\n", (int)(dpll & DPLL_MODE_MASK));
			return 0;
		}

		/* XXX: Handle the 100Mhz refclk */
		intel_clock(dev, 96000, &clock);
	} else {
		bool is_lvds = (pipe == 1) && (I915_READ(LVDS) & LVDS_PORT_EN);

		if (is_lvds) {
			clock.p1 = ffs((dpll & DPLL_FPA01_P1_POST_DIV_MASK_I830_LVDS) >>
				       DPLL_FPA01_P1_POST_DIV_SHIFT);
			clock.p2 = 14;

			if ((dpll & PLL_REF_INPUT_MASK) ==
			    PLLB_REF_INPUT_SPREADSPECTRUMIN) {
				/* XXX: might not be 66MHz */
				intel_clock(dev, 66000, &clock);
			} else
				intel_clock(dev, 48000, &clock);
		} else {
			if (dpll & PLL_P1_DIVIDE_BY_TWO)
				clock.p1 = 2;
			else {
				clock.p1 = ((dpll & DPLL_FPA01_P1_POST_DIV_MASK_I830) >>
					    DPLL_FPA01_P1_POST_DIV_SHIFT) + 2;
			}
			if (dpll & PLL_P2_DIVIDE_BY_4)
				clock.p2 = 4;
			else
				clock.p2 = 2;

			intel_clock(dev, 48000, &clock);
		}
	}

	/* XXX: It would be nice to validate the clocks, but we can't reuse
	 * i830PllIsValid() because it relies on the xf86_config connector
	 * configuration being accurate, which it isn't necessarily.
	 */

	return clock.dot;
}

/** Returns the currently programmed mode of the given pipe. */
struct drm_display_mode *intel_crtc_mode_get(struct drm_device *dev,
					     struct drm_crtc *crtc)
{
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
	enum transcoder cpu_transcoder = intel_crtc->cpu_transcoder;
	struct drm_display_mode *mode;
	int htot = I915_READ(HTOTAL(cpu_transcoder));
	int hsync = I915_READ(HSYNC(cpu_transcoder));
	int vtot = I915_READ(VTOTAL(cpu_transcoder));
	int vsync = I915_READ(VSYNC(cpu_transcoder));

	mode = kzalloc(sizeof(*mode), GFP_KERNEL);
	if (!mode)
		return NULL;

	mode->clock = intel_crtc_clock_get(dev, crtc);
	mode->hdisplay = (htot & 0xffff) + 1;
	mode->htotal = ((htot & 0xffff0000) >> 16) + 1;
	mode->hsync_start = (hsync & 0xffff) + 1;
	mode->hsync_end = ((hsync & 0xffff0000) >> 16) + 1;
	mode->vdisplay = (vtot & 0xffff) + 1;
	mode->vtotal = ((vtot & 0xffff0000) >> 16) + 1;
	mode->vsync_start = (vsync & 0xffff) + 1;
	mode->vsync_end = ((vsync & 0xffff0000) >> 16) + 1;

	drm_mode_set_name(mode);

	return mode;
}

static void intel_increase_pllclock(struct drm_crtc *crtc)
{
	struct drm_device *dev = crtc->dev;
	drm_i915_private_t *dev_priv = dev->dev_private;
	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
	int pipe = intel_crtc->pipe;
	int dpll_reg = DPLL(pipe);
	int dpll;

	if (HAS_PCH_SPLIT(dev))
		return;

	if (!dev_priv->lvds_downclock_avail)
		return;

	dpll = I915_READ(dpll_reg);
	if (!HAS_PIPE_CXSR(dev) && (dpll & DISPLAY_RATE_SELECT_FPA1)) {
		DRM_DEBUG_DRIVER("upclocking LVDS\n");

		assert_panel_unlocked(dev_priv, pipe);

		dpll &= ~DISPLAY_RATE_SELECT_FPA1;
		I915_WRITE(dpll_reg, dpll);
		intel_wait_for_vblank(dev, pipe);

		dpll = I915_READ(dpll_reg);
		if (dpll & DISPLAY_RATE_SELECT_FPA1)
			DRM_DEBUG_DRIVER("failed to upclock LVDS!\n");
	}
}

static void intel_decrease_pllclock(struct drm_crtc *crtc)
{
	struct drm_device *dev = crtc->dev;
	drm_i915_private_t *dev_priv = dev->dev_private;
	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);

	if (HAS_PCH_SPLIT(dev))
		return;

	if (!dev_priv->lvds_downclock_avail)
		return;

	/*
	 * Since this is called by a timer, we should never get here in
	 * the manual case.
	 */
	if (!HAS_PIPE_CXSR(dev) && intel_crtc->lowfreq_avail) {
		int pipe = intel_crtc->pipe;
		int dpll_reg = DPLL(pipe);
		int dpll;

		DRM_DEBUG_DRIVER("downclocking LVDS\n");

		assert_panel_unlocked(dev_priv, pipe);

		dpll = I915_READ(dpll_reg);
		dpll |= DISPLAY_RATE_SELECT_FPA1;
		I915_WRITE(dpll_reg, dpll);
		intel_wait_for_vblank(dev, pipe);
		dpll = I915_READ(dpll_reg);
		if (!(dpll & DISPLAY_RATE_SELECT_FPA1))
			DRM_DEBUG_DRIVER("failed to downclock LVDS!\n");
	}

}

void intel_mark_busy(struct drm_device *dev)
{
	i915_update_gfx_val(dev->dev_private);
}

void intel_mark_idle(struct drm_device *dev)
{
	struct drm_crtc *crtc;

	if (!i915_powersave)
		return;

	list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
		if (!crtc->fb)
			continue;

		intel_decrease_pllclock(crtc);
	}
}

void intel_mark_fb_busy(struct drm_i915_gem_object *obj)
{
	struct drm_device *dev = obj->base.dev;
	struct drm_crtc *crtc;

	if (!i915_powersave)
		return;

	list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
		if (!crtc->fb)
			continue;

		if (to_intel_framebuffer(crtc->fb)->obj == obj)
			intel_increase_pllclock(crtc);
	}
}

static void intel_crtc_destroy(struct drm_crtc *crtc)
{
	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
	struct drm_device *dev = crtc->dev;
	struct intel_unpin_work *work;
	unsigned long flags;

	spin_lock_irqsave(&dev->event_lock, flags);
	work = intel_crtc->unpin_work;
	intel_crtc->unpin_work = NULL;
	spin_unlock_irqrestore(&dev->event_lock, flags);

	if (work) {
		cancel_work_sync(&work->work);
		kfree(work);
	}

	drm_crtc_cleanup(crtc);

	kfree(intel_crtc);
}

static void intel_unpin_work_fn(struct work_struct *__work)
{
	struct intel_unpin_work *work =
		container_of(__work, struct intel_unpin_work, work);
	struct drm_device *dev = work->crtc->dev;

	mutex_lock(&dev->struct_mutex);
	intel_unpin_fb_obj(work->old_fb_obj);
	drm_gem_object_unreference(&work->pending_flip_obj->base);
	drm_gem_object_unreference(&work->old_fb_obj->base);

	intel_update_fbc(dev);
	mutex_unlock(&dev->struct_mutex);

	BUG_ON(atomic_read(&to_intel_crtc(work->crtc)->unpin_work_count) == 0);
	atomic_dec(&to_intel_crtc(work->crtc)->unpin_work_count);

	kfree(work);
}

static void do_intel_finish_page_flip(struct drm_device *dev,
				      struct drm_crtc *crtc)
{
	drm_i915_private_t *dev_priv = dev->dev_private;
	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
	struct intel_unpin_work *work;
	struct drm_i915_gem_object *obj;
	unsigned long flags;

	/* Ignore early vblank irqs */
	if (intel_crtc == NULL)
		return;

	spin_lock_irqsave(&dev->event_lock, flags);
	work = intel_crtc->unpin_work;

	/* Ensure we don't miss a work->pending update ... */
	smp_rmb();

	if (work == NULL || atomic_read(&work->pending) < INTEL_FLIP_COMPLETE) {
		spin_unlock_irqrestore(&dev->event_lock, flags);
		return;
	}

	/* and that the unpin work is consistent wrt ->pending. */
	smp_rmb();

	intel_crtc->unpin_work = NULL;

	if (work->event)
		drm_send_vblank_event(dev, intel_crtc->pipe, work->event);

	drm_vblank_put(dev, intel_crtc->pipe);

	spin_unlock_irqrestore(&dev->event_lock, flags);

	obj = work->old_fb_obj;

	wake_up_all(&dev_priv->pending_flip_queue);

	queue_work(dev_priv->wq, &work->work);

	trace_i915_flip_complete(intel_crtc->plane, work->pending_flip_obj);
}

void intel_finish_page_flip(struct drm_device *dev, int pipe)
{
	drm_i915_private_t *dev_priv = dev->dev_private;
	struct drm_crtc *crtc = dev_priv->pipe_to_crtc_mapping[pipe];

	do_intel_finish_page_flip(dev, crtc);
}

void intel_finish_page_flip_plane(struct drm_device *dev, int plane)
{
	drm_i915_private_t *dev_priv = dev->dev_private;
	struct drm_crtc *crtc = dev_priv->plane_to_crtc_mapping[plane];

	do_intel_finish_page_flip(dev, crtc);
}

void intel_prepare_page_flip(struct drm_device *dev, int plane)
{
	drm_i915_private_t *dev_priv = dev->dev_private;
	struct intel_crtc *intel_crtc =
		to_intel_crtc(dev_priv->plane_to_crtc_mapping[plane]);
	unsigned long flags;

	/* NB: An MMIO update of the plane base pointer will also
	 * generate a page-flip completion irq, i.e. every modeset
	 * is also accompanied by a spurious intel_prepare_page_flip().
	 */
	spin_lock_irqsave(&dev->event_lock, flags);
	if (intel_crtc->unpin_work)
		atomic_inc_not_zero(&intel_crtc->unpin_work->pending);
	spin_unlock_irqrestore(&dev->event_lock, flags);
}

inline static void intel_mark_page_flip_active(struct intel_crtc *intel_crtc)
{
	/* Ensure that the work item is consistent when activating it ... */
	smp_wmb();
	atomic_set(&intel_crtc->unpin_work->pending, INTEL_FLIP_PENDING);
	/* and that it is marked active as soon as the irq could fire. */
	smp_wmb();
}

static int intel_gen2_queue_flip(struct drm_device *dev,
				 struct drm_crtc *crtc,
				 struct drm_framebuffer *fb,
				 struct drm_i915_gem_object *obj)
{
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
	u32 flip_mask;
	struct intel_ring_buffer *ring = &dev_priv->ring[RCS];
	int ret;

	ret = intel_pin_and_fence_fb_obj(dev, obj, ring);
	if (ret)
		goto err;

	ret = intel_ring_begin(ring, 6);
	if (ret)
		goto err_unpin;

	/* Can't queue multiple flips, so wait for the previous
	 * one to finish before executing the next.
	 */
	if (intel_crtc->plane)
		flip_mask = MI_WAIT_FOR_PLANE_B_FLIP;
	else
		flip_mask = MI_WAIT_FOR_PLANE_A_FLIP;
	intel_ring_emit(ring, MI_WAIT_FOR_EVENT | flip_mask);
	intel_ring_emit(ring, MI_NOOP);
	intel_ring_emit(ring, MI_DISPLAY_FLIP |
			MI_DISPLAY_FLIP_PLANE(intel_crtc->plane));
	intel_ring_emit(ring, fb->pitches[0]);
	intel_ring_emit(ring, obj->gtt_offset + intel_crtc->dspaddr_offset);
	intel_ring_emit(ring, 0); /* aux display base address, unused */

	intel_mark_page_flip_active(intel_crtc);
	intel_ring_advance(ring);
	return 0;

err_unpin:
	intel_unpin_fb_obj(obj);
err:
	return ret;
}

static int intel_gen3_queue_flip(struct drm_device *dev,
				 struct drm_crtc *crtc,
				 struct drm_framebuffer *fb,
				 struct drm_i915_gem_object *obj)
{
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
	u32 flip_mask;
	struct intel_ring_buffer *ring = &dev_priv->ring[RCS];
	int ret;

	ret = intel_pin_and_fence_fb_obj(dev, obj, ring);
	if (ret)
		goto err;

	ret = intel_ring_begin(ring, 6);
	if (ret)
		goto err_unpin;

	if (intel_crtc->plane)
		flip_mask = MI_WAIT_FOR_PLANE_B_FLIP;
	else
		flip_mask = MI_WAIT_FOR_PLANE_A_FLIP;
	intel_ring_emit(ring, MI_WAIT_FOR_EVENT | flip_mask);
	intel_ring_emit(ring, MI_NOOP);
	intel_ring_emit(ring, MI_DISPLAY_FLIP_I915 |
			MI_DISPLAY_FLIP_PLANE(intel_crtc->plane));
	intel_ring_emit(ring, fb->pitches[0]);
	intel_ring_emit(ring, obj->gtt_offset + intel_crtc->dspaddr_offset);
	intel_ring_emit(ring, MI_NOOP);

	intel_mark_page_flip_active(intel_crtc);
	intel_ring_advance(ring);
	return 0;

err_unpin:
	intel_unpin_fb_obj(obj);
err:
	return ret;
}

static int intel_gen4_queue_flip(struct drm_device *dev,
				 struct drm_crtc *crtc,
				 struct drm_framebuffer *fb,
				 struct drm_i915_gem_object *obj)
{
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
	uint32_t pf, pipesrc;
	struct intel_ring_buffer *ring = &dev_priv->ring[RCS];
	int ret;

	ret = intel_pin_and_fence_fb_obj(dev, obj, ring);
	if (ret)
		goto err;

	ret = intel_ring_begin(ring, 4);
	if (ret)
		goto err_unpin;

	/* i965+ uses the linear or tiled offsets from the
	 * Display Registers (which do not change across a page-flip)
	 * so we need only reprogram the base address.
	 */
	intel_ring_emit(ring, MI_DISPLAY_FLIP |
			MI_DISPLAY_FLIP_PLANE(intel_crtc->plane));
	intel_ring_emit(ring, fb->pitches[0]);
	intel_ring_emit(ring,
			(obj->gtt_offset + intel_crtc->dspaddr_offset) |
			obj->tiling_mode);

	/* XXX Enabling the panel-fitter across page-flip is so far
	 * untested on non-native modes, so ignore it for now.
	 * pf = I915_READ(pipe == 0 ? PFA_CTL_1 : PFB_CTL_1) & PF_ENABLE;
	 */
	pf = 0;
	pipesrc = I915_READ(PIPESRC(intel_crtc->pipe)) & 0x0fff0fff;
	intel_ring_emit(ring, pf | pipesrc);

	intel_mark_page_flip_active(intel_crtc);
	intel_ring_advance(ring);
	return 0;

err_unpin:
	intel_unpin_fb_obj(obj);
err:
	return ret;
}

static int intel_gen6_queue_flip(struct drm_device *dev,
				 struct drm_crtc *crtc,
				 struct drm_framebuffer *fb,
				 struct drm_i915_gem_object *obj)
{
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
	struct intel_ring_buffer *ring = &dev_priv->ring[RCS];
	uint32_t pf, pipesrc;
	int ret;

	ret = intel_pin_and_fence_fb_obj(dev, obj, ring);
	if (ret)
		goto err;

	ret = intel_ring_begin(ring, 4);
	if (ret)
		goto err_unpin;

	intel_ring_emit(ring, MI_DISPLAY_FLIP |
			MI_DISPLAY_FLIP_PLANE(intel_crtc->plane));
	intel_ring_emit(ring, fb->pitches[0] | obj->tiling_mode);
	intel_ring_emit(ring, obj->gtt_offset + intel_crtc->dspaddr_offset);

	/* Contrary to the suggestions in the documentation,
	 * "Enable Panel Fitter" does not seem to be required when page
	 * flipping with a non-native mode, and worse causes a normal
	 * modeset to fail.
	 * pf = I915_READ(PF_CTL(intel_crtc->pipe)) & PF_ENABLE;
	 */
	pf = 0;
	pipesrc = I915_READ(PIPESRC(intel_crtc->pipe)) & 0x0fff0fff;
	intel_ring_emit(ring, pf | pipesrc);

	intel_mark_page_flip_active(intel_crtc);
	intel_ring_advance(ring);
	return 0;

err_unpin:
	intel_unpin_fb_obj(obj);
err:
	return ret;
}

/*
 * On gen7 we currently use the blit ring because (in early silicon at least)
 * the render ring doesn't give us interrpts for page flip completion, which
 * means clients will hang after the first flip is queued.  Fortunately the
 * blit ring generates interrupts properly, so use it instead.
 */
static int intel_gen7_queue_flip(struct drm_device *dev,
				 struct drm_crtc *crtc,
				 struct drm_framebuffer *fb,
				 struct drm_i915_gem_object *obj)
{
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
	struct intel_ring_buffer *ring = &dev_priv->ring[BCS];
	uint32_t plane_bit = 0;
	int ret;

	ret = intel_pin_and_fence_fb_obj(dev, obj, ring);
	if (ret)
		goto err;

	switch(intel_crtc->plane) {
	case PLANE_A:
		plane_bit = MI_DISPLAY_FLIP_IVB_PLANE_A;
		break;
	case PLANE_B:
		plane_bit = MI_DISPLAY_FLIP_IVB_PLANE_B;
		break;
	case PLANE_C:
		plane_bit = MI_DISPLAY_FLIP_IVB_PLANE_C;
		break;
	default:
		WARN_ONCE(1, "unknown plane in flip command\n");
		ret = -ENODEV;
		goto err_unpin;
	}

	ret = intel_ring_begin(ring, 4);
	if (ret)
		goto err_unpin;

	intel_ring_emit(ring, MI_DISPLAY_FLIP_I915 | plane_bit);
	intel_ring_emit(ring, (fb->pitches[0] | obj->tiling_mode));
	intel_ring_emit(ring, obj->gtt_offset + intel_crtc->dspaddr_offset);
	intel_ring_emit(ring, (MI_NOOP));

	intel_mark_page_flip_active(intel_crtc);
	intel_ring_advance(ring);
	return 0;

err_unpin:
	intel_unpin_fb_obj(obj);
err:
	return ret;
}

static int intel_default_queue_flip(struct drm_device *dev,
				    struct drm_crtc *crtc,
				    struct drm_framebuffer *fb,
				    struct drm_i915_gem_object *obj)
{
	return -ENODEV;
}

static int intel_crtc_page_flip(struct drm_crtc *crtc,
				struct drm_framebuffer *fb,
				struct drm_pending_vblank_event *event)
{
	struct drm_device *dev = crtc->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct drm_framebuffer *old_fb = crtc->fb;
	struct drm_i915_gem_object *obj = to_intel_framebuffer(fb)->obj;
	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
	struct intel_unpin_work *work;
	unsigned long flags;
	int ret;

	/* Can't change pixel format via MI display flips. */
	if (fb->pixel_format != crtc->fb->pixel_format)
		return -EINVAL;

	/*
	 * TILEOFF/LINOFF registers can't be changed via MI display flips.
	 * Note that pitch changes could also affect these register.
	 */
	if (INTEL_INFO(dev)->gen > 3 &&
	    (fb->offsets[0] != crtc->fb->offsets[0] ||
	     fb->pitches[0] != crtc->fb->pitches[0]))
		return -EINVAL;

	work = kzalloc(sizeof *work, GFP_KERNEL);
	if (work == NULL)
		return -ENOMEM;

	work->event = event;
	work->crtc = crtc;
	work->old_fb_obj = to_intel_framebuffer(old_fb)->obj;
	INIT_WORK(&work->work, intel_unpin_work_fn);

	ret = drm_vblank_get(dev, intel_crtc->pipe);
	if (ret)
		goto free_work;

	/* We borrow the event spin lock for protecting unpin_work */
	spin_lock_irqsave(&dev->event_lock, flags);
	if (intel_crtc->unpin_work) {
		spin_unlock_irqrestore(&dev->event_lock, flags);
		kfree(work);
		drm_vblank_put(dev, intel_crtc->pipe);

		DRM_DEBUG_DRIVER("flip queue: crtc already busy\n");
		return -EBUSY;
	}
	intel_crtc->unpin_work = work;
	spin_unlock_irqrestore(&dev->event_lock, flags);

	if (atomic_read(&intel_crtc->unpin_work_count) >= 2)
		flush_workqueue(dev_priv->wq);

	ret = i915_mutex_lock_interruptible(dev);
	if (ret)
		goto cleanup;

	/* Reference the objects for the scheduled work. */
	drm_gem_object_reference(&work->old_fb_obj->base);
	drm_gem_object_reference(&obj->base);

	crtc->fb = fb;

	work->pending_flip_obj = obj;

	work->enable_stall_check = true;

	atomic_inc(&intel_crtc->unpin_work_count);
	intel_crtc->reset_counter = atomic_read(&dev_priv->gpu_error.reset_counter);

	ret = dev_priv->display.queue_flip(dev, crtc, fb, obj);
	if (ret)
		goto cleanup_pending;

	intel_disable_fbc(dev);
	intel_mark_fb_busy(obj);
	mutex_unlock(&dev->struct_mutex);

	trace_i915_flip_request(intel_crtc->plane, obj);

	return 0;

cleanup_pending:
	atomic_dec(&intel_crtc->unpin_work_count);
	crtc->fb = old_fb;
	drm_gem_object_unreference(&work->old_fb_obj->base);
	drm_gem_object_unreference(&obj->base);
	mutex_unlock(&dev->struct_mutex);

cleanup:
	spin_lock_irqsave(&dev->event_lock, flags);
	intel_crtc->unpin_work = NULL;
	spin_unlock_irqrestore(&dev->event_lock, flags);

	drm_vblank_put(dev, intel_crtc->pipe);
free_work:
	kfree(work);

	return ret;
}

static struct drm_crtc_helper_funcs intel_helper_funcs = {
	.mode_set_base_atomic = intel_pipe_set_base_atomic,
	.load_lut = intel_crtc_load_lut,
	.disable = intel_crtc_noop,
};

bool intel_encoder_check_is_cloned(struct intel_encoder *encoder)
{
	struct intel_encoder *other_encoder;
	struct drm_crtc *crtc = &encoder->new_crtc->base;

	if (WARN_ON(!crtc))
		return false;

	list_for_each_entry(other_encoder,
			    &crtc->dev->mode_config.encoder_list,
			    base.head) {

		if (&other_encoder->new_crtc->base != crtc ||
		    encoder == other_encoder)
			continue;
		else
			return true;
	}

	return false;
}

static bool intel_encoder_crtc_ok(struct drm_encoder *encoder,
				  struct drm_crtc *crtc)
{
	struct drm_device *dev;
	struct drm_crtc *tmp;
	int crtc_mask = 1;

	WARN(!crtc, "checking null crtc?\n");

	dev = crtc->dev;

	list_for_each_entry(tmp, &dev->mode_config.crtc_list, head) {
		if (tmp == crtc)
			break;
		crtc_mask <<= 1;
	}

	if (encoder->possible_crtcs & crtc_mask)
		return true;
	return false;
}

/**
 * intel_modeset_update_staged_output_state
 *
 * Updates the staged output configuration state, e.g. after we've read out the
 * current hw state.
 */
static void intel_modeset_update_staged_output_state(struct drm_device *dev)
{
	struct intel_encoder *encoder;
	struct intel_connector *connector;

	list_for_each_entry(connector, &dev->mode_config.connector_list,
			    base.head) {
		connector->new_encoder =
			to_intel_encoder(connector->base.encoder);
	}

	list_for_each_entry(encoder, &dev->mode_config.encoder_list,
			    base.head) {
		encoder->new_crtc =
			to_intel_crtc(encoder->base.crtc);
	}
}

/**
 * intel_modeset_commit_output_state
 *
 * This function copies the stage display pipe configuration to the real one.
 */
static void intel_modeset_commit_output_state(struct drm_device *dev)
{
	struct intel_encoder *encoder;
	struct intel_connector *connector;

	list_for_each_entry(connector, &dev->mode_config.connector_list,
			    base.head) {
		connector->base.encoder = &connector->new_encoder->base;
	}

	list_for_each_entry(encoder, &dev->mode_config.encoder_list,
			    base.head) {
		encoder->base.crtc = &encoder->new_crtc->base;
	}
}

static struct drm_display_mode *
intel_modeset_adjusted_mode(struct drm_crtc *crtc,
			    struct drm_display_mode *mode)
{
	struct drm_device *dev = crtc->dev;
	struct drm_display_mode *adjusted_mode;
	struct drm_encoder_helper_funcs *encoder_funcs;
	struct intel_encoder *encoder;

	adjusted_mode = drm_mode_duplicate(dev, mode);
	if (!adjusted_mode)
		return ERR_PTR(-ENOMEM);

	/* Pass our mode to the connectors and the CRTC to give them a chance to
	 * adjust it according to limitations or connector properties, and also
	 * a chance to reject the mode entirely.
	 */
	list_for_each_entry(encoder, &dev->mode_config.encoder_list,
			    base.head) {

		if (&encoder->new_crtc->base != crtc)
			continue;
		encoder_funcs = encoder->base.helper_private;
		if (!(encoder_funcs->mode_fixup(&encoder->base, mode,
						adjusted_mode))) {
			DRM_DEBUG_KMS("Encoder fixup failed\n");
			goto fail;
		}
	}

	if (!(intel_crtc_mode_fixup(crtc, mode, adjusted_mode))) {
		DRM_DEBUG_KMS("CRTC fixup failed\n");
		goto fail;
	}
	DRM_DEBUG_KMS("[CRTC:%d]\n", crtc->base.id);

	return adjusted_mode;
fail:
	drm_mode_destroy(dev, adjusted_mode);
	return ERR_PTR(-EINVAL);
}

/* Computes which crtcs are affected and sets the relevant bits in the mask. For
 * simplicity we use the crtc's pipe number (because it's easier to obtain). */
static void
intel_modeset_affected_pipes(struct drm_crtc *crtc, unsigned *modeset_pipes,
			     unsigned *prepare_pipes, unsigned *disable_pipes)
{
	struct intel_crtc *intel_crtc;
	struct drm_device *dev = crtc->dev;
	struct intel_encoder *encoder;
	struct intel_connector *connector;
	struct drm_crtc *tmp_crtc;

	*disable_pipes = *modeset_pipes = *prepare_pipes = 0;

	/* Check which crtcs have changed outputs connected to them, these need
	 * to be part of the prepare_pipes mask. We don't (yet) support global
	 * modeset across multiple crtcs, so modeset_pipes will only have one
	 * bit set at most. */
	list_for_each_entry(connector, &dev->mode_config.connector_list,
			    base.head) {
		if (connector->base.encoder == &connector->new_encoder->base)
			continue;

		if (connector->base.encoder) {
			tmp_crtc = connector->base.encoder->crtc;

			*prepare_pipes |= 1 << to_intel_crtc(tmp_crtc)->pipe;
		}

		if (connector->new_encoder)
			*prepare_pipes |=
				1 << connector->new_encoder->new_crtc->pipe;
	}

	list_for_each_entry(encoder, &dev->mode_config.encoder_list,
			    base.head) {
		if (encoder->base.crtc == &encoder->new_crtc->base)
			continue;

		if (encoder->base.crtc) {
			tmp_crtc = encoder->base.crtc;

			*prepare_pipes |= 1 << to_intel_crtc(tmp_crtc)->pipe;
		}

		if (encoder->new_crtc)
			*prepare_pipes |= 1 << encoder->new_crtc->pipe;
	}

	/* Check for any pipes that will be fully disabled ... */
	list_for_each_entry(intel_crtc, &dev->mode_config.crtc_list,
			    base.head) {
		bool used = false;

		/* Don't try to disable disabled crtcs. */
		if (!intel_crtc->base.enabled)
			continue;

		list_for_each_entry(encoder, &dev->mode_config.encoder_list,
				    base.head) {
			if (encoder->new_crtc == intel_crtc)
				used = true;
		}

		if (!used)
			*disable_pipes |= 1 << intel_crtc->pipe;
	}


	/* set_mode is also used to update properties on life display pipes. */
	intel_crtc = to_intel_crtc(crtc);
	if (crtc->enabled)
		*prepare_pipes |= 1 << intel_crtc->pipe;

	/* We only support modeset on one single crtc, hence we need to do that
	 * only for the passed in crtc iff we change anything else than just
	 * disable crtcs.
	 *
	 * This is actually not true, to be fully compatible with the old crtc
	 * helper we automatically disable _any_ output (i.e. doesn't need to be
	 * connected to the crtc we're modesetting on) if it's disconnected.
	 * Which is a rather nutty api (since changed the output configuration
	 * without userspace's explicit request can lead to confusion), but
	 * alas. Hence we currently need to modeset on all pipes we prepare. */
	if (*prepare_pipes)
		*modeset_pipes = *prepare_pipes;

	/* ... and mask these out. */
	*modeset_pipes &= ~(*disable_pipes);
	*prepare_pipes &= ~(*disable_pipes);
}

static bool intel_crtc_in_use(struct drm_crtc *crtc)
{
	struct drm_encoder *encoder;
	struct drm_device *dev = crtc->dev;

	list_for_each_entry(encoder, &dev->mode_config.encoder_list, head)
		if (encoder->crtc == crtc)
			return true;

	return false;
}

static void
intel_modeset_update_state(struct drm_device *dev, unsigned prepare_pipes)
{
	struct intel_encoder *intel_encoder;
	struct intel_crtc *intel_crtc;
	struct drm_connector *connector;

	list_for_each_entry(intel_encoder, &dev->mode_config.encoder_list,
			    base.head) {
		if (!intel_encoder->base.crtc)
			continue;

		intel_crtc = to_intel_crtc(intel_encoder->base.crtc);

		if (prepare_pipes & (1 << intel_crtc->pipe))
			intel_encoder->connectors_active = false;
	}

	intel_modeset_commit_output_state(dev);

	/* Update computed state. */
	list_for_each_entry(intel_crtc, &dev->mode_config.crtc_list,
			    base.head) {
		intel_crtc->base.enabled = intel_crtc_in_use(&intel_crtc->base);
	}

	list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
		if (!connector->encoder || !connector->encoder->crtc)
			continue;

		intel_crtc = to_intel_crtc(connector->encoder->crtc);

		if (prepare_pipes & (1 << intel_crtc->pipe)) {
			struct drm_property *dpms_property =
				dev->mode_config.dpms_property;

			connector->dpms = DRM_MODE_DPMS_ON;
			drm_object_property_set_value(&connector->base,
							 dpms_property,
							 DRM_MODE_DPMS_ON);

			intel_encoder = to_intel_encoder(connector->encoder);
			intel_encoder->connectors_active = true;
		}
	}

}

#define for_each_intel_crtc_masked(dev, mask, intel_crtc) \
	list_for_each_entry((intel_crtc), \
			    &(dev)->mode_config.crtc_list, \
			    base.head) \
		if (mask & (1 <<(intel_crtc)->pipe)) \

void
intel_modeset_check_state(struct drm_device *dev)
{
	struct intel_crtc *crtc;
	struct intel_encoder *encoder;
	struct intel_connector *connector;

	list_for_each_entry(connector, &dev->mode_config.connector_list,
			    base.head) {
		/* This also checks the encoder/connector hw state with the
		 * ->get_hw_state callbacks. */
		intel_connector_check_state(connector);

		WARN(&connector->new_encoder->base != connector->base.encoder,
		     "connector's staged encoder doesn't match current encoder\n");
	}

	list_for_each_entry(encoder, &dev->mode_config.encoder_list,
			    base.head) {
		bool enabled = false;
		bool active = false;
		enum pipe pipe, tracked_pipe;

		DRM_DEBUG_KMS("[ENCODER:%d:%s]\n",
			      encoder->base.base.id,
			      drm_get_encoder_name(&encoder->base));

		WARN(&encoder->new_crtc->base != encoder->base.crtc,
		     "encoder's stage crtc doesn't match current crtc\n");
		WARN(encoder->connectors_active && !encoder->base.crtc,
		     "encoder's active_connectors set, but no crtc\n");

		list_for_each_entry(connector, &dev->mode_config.connector_list,
				    base.head) {
			if (connector->base.encoder != &encoder->base)
				continue;
			enabled = true;
			if (connector->base.dpms != DRM_MODE_DPMS_OFF)
				active = true;
		}
		WARN(!!encoder->base.crtc != enabled,
		     "encoder's enabled state mismatch "
		     "(expected %i, found %i)\n",
		     !!encoder->base.crtc, enabled);
		WARN(active && !encoder->base.crtc,
		     "active encoder with no crtc\n");

		WARN(encoder->connectors_active != active,
		     "encoder's computed active state doesn't match tracked active state "
		     "(expected %i, found %i)\n", active, encoder->connectors_active);

		active = encoder->get_hw_state(encoder, &pipe);
		WARN(active != encoder->connectors_active,
		     "encoder's hw state doesn't match sw tracking "
		     "(expected %i, found %i)\n",
		     encoder->connectors_active, active);

		if (!encoder->base.crtc)
			continue;

		tracked_pipe = to_intel_crtc(encoder->base.crtc)->pipe;
		WARN(active && pipe != tracked_pipe,
		     "active encoder's pipe doesn't match"
		     "(expected %i, found %i)\n",
		     tracked_pipe, pipe);

	}

	list_for_each_entry(crtc, &dev->mode_config.crtc_list,
			    base.head) {
		bool enabled = false;
		bool active = false;

		DRM_DEBUG_KMS("[CRTC:%d]\n",
			      crtc->base.base.id);

		WARN(crtc->active && !crtc->base.enabled,
		     "active crtc, but not enabled in sw tracking\n");

		list_for_each_entry(encoder, &dev->mode_config.encoder_list,
				    base.head) {
			if (encoder->base.crtc != &crtc->base)
				continue;
			enabled = true;
			if (encoder->connectors_active)
				active = true;
		}
		WARN(active != crtc->active,
		     "crtc's computed active state doesn't match tracked active state "
		     "(expected %i, found %i)\n", active, crtc->active);
		WARN(enabled != crtc->base.enabled,
		     "crtc's computed enabled state doesn't match tracked enabled state "
		     "(expected %i, found %i)\n", enabled, crtc->base.enabled);

		assert_pipe(dev->dev_private, crtc->pipe, crtc->active);
	}
}

int intel_set_mode(struct drm_crtc *crtc,
		   struct drm_display_mode *mode,
		   int x, int y, struct drm_framebuffer *fb)
{
	struct drm_device *dev = crtc->dev;
	drm_i915_private_t *dev_priv = dev->dev_private;
	struct drm_display_mode *adjusted_mode, *saved_mode, *saved_hwmode;
	struct intel_crtc *intel_crtc;
	unsigned disable_pipes, prepare_pipes, modeset_pipes;
	int ret = 0;

	saved_mode = kmalloc(2 * sizeof(*saved_mode), GFP_KERNEL);
	if (!saved_mode)
		return -ENOMEM;
	saved_hwmode = saved_mode + 1;

	intel_modeset_affected_pipes(crtc, &modeset_pipes,
				     &prepare_pipes, &disable_pipes);

	DRM_DEBUG_KMS("set mode pipe masks: modeset: %x, prepare: %x, disable: %x\n",
		      modeset_pipes, prepare_pipes, disable_pipes);

	for_each_intel_crtc_masked(dev, disable_pipes, intel_crtc)
		intel_crtc_disable(&intel_crtc->base);

	*saved_hwmode = crtc->hwmode;
	*saved_mode = crtc->mode;

	/* Hack: Because we don't (yet) support global modeset on multiple
	 * crtcs, we don't keep track of the new mode for more than one crtc.
	 * Hence simply check whether any bit is set in modeset_pipes in all the
	 * pieces of code that are not yet converted to deal with mutliple crtcs
	 * changing their mode at the same time. */
	adjusted_mode = NULL;
	if (modeset_pipes) {
		adjusted_mode = intel_modeset_adjusted_mode(crtc, mode);
		if (IS_ERR(adjusted_mode)) {
			ret = PTR_ERR(adjusted_mode);
			goto out;
		}
	}

	for_each_intel_crtc_masked(dev, prepare_pipes, intel_crtc) {
		if (intel_crtc->base.enabled)
			dev_priv->display.crtc_disable(&intel_crtc->base);
	}

	/* crtc->mode is already used by the ->mode_set callbacks, hence we need
	 * to set it here already despite that we pass it down the callchain.
	 */
	if (modeset_pipes)
		crtc->mode = *mode;

	/* Only after disabling all output pipelines that will be changed can we
	 * update the the output configuration. */
	intel_modeset_update_state(dev, prepare_pipes);

	if (dev_priv->display.modeset_global_resources)
		dev_priv->display.modeset_global_resources(dev);

	/* Set up the DPLL and any encoders state that needs to adjust or depend
	 * on the DPLL.
	 */
	for_each_intel_crtc_masked(dev, modeset_pipes, intel_crtc) {
		ret = intel_crtc_mode_set(&intel_crtc->base,
					  mode, adjusted_mode,
					  x, y, fb);
		if (ret)
			goto done;
	}

	/* Now enable the clocks, plane, pipe, and connectors that we set up. */
	for_each_intel_crtc_masked(dev, prepare_pipes, intel_crtc)
		dev_priv->display.crtc_enable(&intel_crtc->base);

	if (modeset_pipes) {
		/* Store real post-adjustment hardware mode. */
		crtc->hwmode = *adjusted_mode;

		/* Calculate and store various constants which
		 * are later needed by vblank and swap-completion
		 * timestamping. They are derived from true hwmode.
		 */
		drm_calc_timestamping_constants(crtc);
	}

	/* FIXME: add subpixel order */
done:
	drm_mode_destroy(dev, adjusted_mode);
	if (ret && crtc->enabled) {
		crtc->hwmode = *saved_hwmode;
		crtc->mode = *saved_mode;
	} else {
		intel_modeset_check_state(dev);
	}

out:
	kfree(saved_mode);
	return ret;
}

void intel_crtc_restore_mode(struct drm_crtc *crtc)
{
	intel_set_mode(crtc, &crtc->mode, crtc->x, crtc->y, crtc->fb);
}

#undef for_each_intel_crtc_masked

static void intel_set_config_free(struct intel_set_config *config)
{
	if (!config)
		return;

	kfree(config->save_connector_encoders);
	kfree(config->save_encoder_crtcs);
	kfree(config);
}

static int intel_set_config_save_state(struct drm_device *dev,
				       struct intel_set_config *config)
{
	struct drm_encoder *encoder;
	struct drm_connector *connector;
	int count;

	config->save_encoder_crtcs =
		kcalloc(dev->mode_config.num_encoder,
			sizeof(struct drm_crtc *), GFP_KERNEL);
	if (!config->save_encoder_crtcs)
		return -ENOMEM;

	config->save_connector_encoders =
		kcalloc(dev->mode_config.num_connector,
			sizeof(struct drm_encoder *), GFP_KERNEL);
	if (!config->save_connector_encoders)
		return -ENOMEM;

	/* Copy data. Note that driver private data is not affected.
	 * Should anything bad happen only the expected state is
	 * restored, not the drivers personal bookkeeping.
	 */
	count = 0;
	list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
		config->save_encoder_crtcs[count++] = encoder->crtc;
	}

	count = 0;
	list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
		config->save_connector_encoders[count++] = connector->encoder;
	}

	return 0;
}

static void intel_set_config_restore_state(struct drm_device *dev,
					   struct intel_set_config *config)
{
	struct intel_encoder *encoder;
	struct intel_connector *connector;
	int count;

	count = 0;
	list_for_each_entry(encoder, &dev->mode_config.encoder_list, base.head) {
		encoder->new_crtc =
			to_intel_crtc(config->save_encoder_crtcs[count++]);
	}

	count = 0;
	list_for_each_entry(connector, &dev->mode_config.connector_list, base.head) {
		connector->new_encoder =
			to_intel_encoder(config->save_connector_encoders[count++]);
	}
}

static void
intel_set_config_compute_mode_changes(struct drm_mode_set *set,
				      struct intel_set_config *config)
{

	/* We should be able to check here if the fb has the same properties
	 * and then just flip_or_move it */
	if (set->crtc->fb != set->fb) {
		/* If we have no fb then treat it as a full mode set */
		if (set->crtc->fb == NULL) {
			DRM_DEBUG_KMS("crtc has no fb, full mode set\n");
			config->mode_changed = true;
		} else if (set->fb == NULL) {
			config->mode_changed = true;
		} else if (set->fb->depth != set->crtc->fb->depth) {
			config->mode_changed = true;
		} else if (set->fb->bits_per_pixel !=
			   set->crtc->fb->bits_per_pixel) {
			config->mode_changed = true;
		} else
			config->fb_changed = true;
	}

	if (set->fb && (set->x != set->crtc->x || set->y != set->crtc->y))
		config->fb_changed = true;

	if (set->mode && !drm_mode_equal(set->mode, &set->crtc->mode)) {
		DRM_DEBUG_KMS("modes are different, full mode set\n");
		drm_mode_debug_printmodeline(&set->crtc->mode);
		drm_mode_debug_printmodeline(set->mode);
		config->mode_changed = true;
	}
}

static int
intel_modeset_stage_output_state(struct drm_device *dev,
				 struct drm_mode_set *set,
				 struct intel_set_config *config)
{
	struct drm_crtc *new_crtc;
	struct intel_connector *connector;
	struct intel_encoder *encoder;
	int count, ro;

	/* The upper layers ensure that we either disable a crtc or have a list
	 * of connectors. For paranoia, double-check this. */
	WARN_ON(!set->fb && (set->num_connectors != 0));
	WARN_ON(set->fb && (set->num_connectors == 0));

	count = 0;
	list_for_each_entry(connector, &dev->mode_config.connector_list,
			    base.head) {
		/* Otherwise traverse passed in connector list and get encoders
		 * for them. */
		for (ro = 0; ro < set->num_connectors; ro++) {
			if (set->connectors[ro] == &connector->base) {
				connector->new_encoder = connector->encoder;
				break;
			}
		}

		/* If we disable the crtc, disable all its connectors. Also, if
		 * the connector is on the changing crtc but not on the new
		 * connector list, disable it. */
		if ((!set->fb || ro == set->num_connectors) &&
		    connector->base.encoder &&
		    connector->base.encoder->crtc == set->crtc) {
			connector->new_encoder = NULL;

			DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [NOCRTC]\n",
				connector->base.base.id,
				drm_get_connector_name(&connector->base));
		}


		if (&connector->new_encoder->base != connector->base.encoder) {
			DRM_DEBUG_KMS("encoder changed, full mode switch\n");
			config->mode_changed = true;
		}
	}
	/* connector->new_encoder is now updated for all connectors. */

	/* Update crtc of enabled connectors. */
	count = 0;
	list_for_each_entry(connector, &dev->mode_config.connector_list,
			    base.head) {
		if (!connector->new_encoder)
			continue;

		new_crtc = connector->new_encoder->base.crtc;

		for (ro = 0; ro < set->num_connectors; ro++) {
			if (set->connectors[ro] == &connector->base)
				new_crtc = set->crtc;
		}

		/* Make sure the new CRTC will work with the encoder */
		if (!intel_encoder_crtc_ok(&connector->new_encoder->base,
					   new_crtc)) {
			return -EINVAL;
		}
		connector->encoder->new_crtc = to_intel_crtc(new_crtc);

		DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [CRTC:%d]\n",
			connector->base.base.id,
			drm_get_connector_name(&connector->base),
			new_crtc->base.id);
	}

	/* Check for any encoders that needs to be disabled. */
	list_for_each_entry(encoder, &dev->mode_config.encoder_list,
			    base.head) {
		list_for_each_entry(connector,
				    &dev->mode_config.connector_list,
				    base.head) {
			if (connector->new_encoder == encoder) {
				WARN_ON(!connector->new_encoder->new_crtc);

				goto next_encoder;
			}
		}
		encoder->new_crtc = NULL;
next_encoder:
		/* Only now check for crtc changes so we don't miss encoders
		 * that will be disabled. */
		if (&encoder->new_crtc->base != encoder->base.crtc) {
			DRM_DEBUG_KMS("crtc changed, full mode switch\n");
			config->mode_changed = true;
		}
	}
	/* Now we've also updated encoder->new_crtc for all encoders. */

	return 0;
}

static int intel_crtc_set_config(struct drm_mode_set *set)
{
	struct drm_device *dev;
	struct drm_mode_set save_set;
	struct intel_set_config *config;
	int ret;

	BUG_ON(!set);
	BUG_ON(!set->crtc);
	BUG_ON(!set->crtc->helper_private);

	if (!set->mode)
		set->fb = NULL;

	/* The fb helper likes to play gross jokes with ->mode_set_config.
	 * Unfortunately the crtc helper doesn't do much at all for this case,
	 * so we have to cope with this madness until the fb helper is fixed up. */
	if (set->fb && set->num_connectors == 0)
		return 0;

	if (set->fb) {
		DRM_DEBUG_KMS("[CRTC:%d] [FB:%d] #connectors=%d (x y) (%i %i)\n",
				set->crtc->base.id, set->fb->base.id,
				(int)set->num_connectors, set->x, set->y);
	} else {
		DRM_DEBUG_KMS("[CRTC:%d] [NOFB]\n", set->crtc->base.id);
	}

	dev = set->crtc->dev;

	ret = -ENOMEM;
	config = kzalloc(sizeof(*config), GFP_KERNEL);
	if (!config)
		goto out_config;

	ret = intel_set_config_save_state(dev, config);
	if (ret)
		goto out_config;

	save_set.crtc = set->crtc;
	save_set.mode = &set->crtc->mode;
	save_set.x = set->crtc->x;
	save_set.y = set->crtc->y;
	save_set.fb = set->crtc->fb;

	/* Compute whether we need a full modeset, only an fb base update or no
	 * change at all. In the future we might also check whether only the
	 * mode changed, e.g. for LVDS where we only change the panel fitter in
	 * such cases. */
	intel_set_config_compute_mode_changes(set, config);

	ret = intel_modeset_stage_output_state(dev, set, config);
	if (ret)
		goto fail;

	if (config->mode_changed) {
		if (set->mode) {
			DRM_DEBUG_KMS("attempting to set mode from"
					" userspace\n");
			drm_mode_debug_printmodeline(set->mode);
		}

		ret = intel_set_mode(set->crtc, set->mode,
				     set->x, set->y, set->fb);
		if (ret) {
			DRM_ERROR("failed to set mode on [CRTC:%d], err = %d\n",
				  set->crtc->base.id, ret);
			goto fail;
		}
	} else if (config->fb_changed) {
		ret = intel_pipe_set_base(set->crtc,
					  set->x, set->y, set->fb);
	}

	intel_set_config_free(config);

	return 0;

fail:
	intel_set_config_restore_state(dev, config);

	/* Try to restore the config */
	if (config->mode_changed &&
	    intel_set_mode(save_set.crtc, save_set.mode,
			   save_set.x, save_set.y, save_set.fb))
		DRM_ERROR("failed to restore config after modeset failure\n");

out_config:
	intel_set_config_free(config);
	return ret;
}

static const struct drm_crtc_funcs intel_crtc_funcs = {
	.cursor_set = intel_crtc_cursor_set,
	.cursor_move = intel_crtc_cursor_move,
	.gamma_set = intel_crtc_gamma_set,
	.set_config = intel_crtc_set_config,
	.destroy = intel_crtc_destroy,
	.page_flip = intel_crtc_page_flip,
};

static void intel_cpu_pll_init(struct drm_device *dev)
{
	if (HAS_DDI(dev))
		intel_ddi_pll_init(dev);
}

static void intel_pch_pll_init(struct drm_device *dev)
{
	drm_i915_private_t *dev_priv = dev->dev_private;
	int i;

	if (dev_priv->num_pch_pll == 0) {
		DRM_DEBUG_KMS("No PCH PLLs on this hardware, skipping initialisation\n");
		return;
	}

	for (i = 0; i < dev_priv->num_pch_pll; i++) {
		dev_priv->pch_plls[i].pll_reg = _PCH_DPLL(i);
		dev_priv->pch_plls[i].fp0_reg = _PCH_FP0(i);
		dev_priv->pch_plls[i].fp1_reg = _PCH_FP1(i);
	}
}

static void intel_crtc_init(struct drm_device *dev, int pipe)
{
	drm_i915_private_t *dev_priv = dev->dev_private;
	struct intel_crtc *intel_crtc;
	int i;

	intel_crtc = kzalloc(sizeof(struct intel_crtc) + (INTELFB_CONN_LIMIT * sizeof(struct drm_connector *)), GFP_KERNEL);
	if (intel_crtc == NULL)
		return;

	drm_crtc_init(dev, &intel_crtc->base, &intel_crtc_funcs);

	drm_mode_crtc_set_gamma_size(&intel_crtc->base, 256);
	for (i = 0; i < 256; i++) {
		intel_crtc->lut_r[i] = i;
		intel_crtc->lut_g[i] = i;
		intel_crtc->lut_b[i] = i;
	}

	/* Swap pipes & planes for FBC on pre-965 */
	intel_crtc->pipe = pipe;
	intel_crtc->plane = pipe;
	intel_crtc->cpu_transcoder = pipe;
	if (IS_MOBILE(dev) && IS_GEN3(dev)) {
		DRM_DEBUG_KMS("swapping pipes & planes for FBC\n");
		intel_crtc->plane = !pipe;
	}

	BUG_ON(pipe >= ARRAY_SIZE(dev_priv->plane_to_crtc_mapping) ||
	       dev_priv->plane_to_crtc_mapping[intel_crtc->plane] != NULL);
	dev_priv->plane_to_crtc_mapping[intel_crtc->plane] = &intel_crtc->base;
	dev_priv->pipe_to_crtc_mapping[intel_crtc->pipe] = &intel_crtc->base;

	intel_crtc->bpp = 24; /* default for pre-Ironlake */

	drm_crtc_helper_add(&intel_crtc->base, &intel_helper_funcs);
}

int intel_get_pipe_from_crtc_id(struct drm_device *dev, void *data,
				struct drm_file *file)
{
	struct drm_i915_get_pipe_from_crtc_id *pipe_from_crtc_id = data;
	struct drm_mode_object *drmmode_obj;
	struct intel_crtc *crtc;

	if (!drm_core_check_feature(dev, DRIVER_MODESET))
		return -ENODEV;

	drmmode_obj = drm_mode_object_find(dev, pipe_from_crtc_id->crtc_id,
			DRM_MODE_OBJECT_CRTC);

	if (!drmmode_obj) {
		DRM_ERROR("no such CRTC id\n");
		return -EINVAL;
	}

	crtc = to_intel_crtc(obj_to_crtc(drmmode_obj));
	pipe_from_crtc_id->pipe = crtc->pipe;

	return 0;
}

static int intel_encoder_clones(struct intel_encoder *encoder)
{
	struct drm_device *dev = encoder->base.dev;
	struct intel_encoder *source_encoder;
	int index_mask = 0;
	int entry = 0;

	list_for_each_entry(source_encoder,
			    &dev->mode_config.encoder_list, base.head) {

		if (encoder == source_encoder)
			index_mask |= (1 << entry);

		/* Intel hw has only one MUX where enocoders could be cloned. */
		if (encoder->cloneable && source_encoder->cloneable)
			index_mask |= (1 << entry);

		entry++;
	}

	return index_mask;
}

static bool has_edp_a(struct drm_device *dev)
{
	struct drm_i915_private *dev_priv = dev->dev_private;

	if (!IS_MOBILE(dev))
		return false;

	if ((I915_READ(DP_A) & DP_DETECTED) == 0)
		return false;

	if (IS_GEN5(dev) &&
	    (I915_READ(ILK_DISPLAY_CHICKEN_FUSES) & ILK_eDP_A_DISABLE))
		return false;

	return true;
}

static void intel_setup_outputs(struct drm_device *dev)
{
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_encoder *encoder;
	bool dpd_is_edp = false;
	bool has_lvds;

	has_lvds = intel_lvds_init(dev);
	if (!has_lvds && !HAS_PCH_SPLIT(dev)) {
		/* disable the panel fitter on everything but LVDS */
		I915_WRITE(PFIT_CONTROL, 0);
	}

	if (!(HAS_DDI(dev) && (I915_READ(DDI_BUF_CTL(PORT_A)) & DDI_A_4_LANES)))
		intel_crt_init(dev);

	if (HAS_DDI(dev)) {
		int found;

		/* Haswell uses DDI functions to detect digital outputs */
		found = I915_READ(DDI_BUF_CTL_A) & DDI_INIT_DISPLAY_DETECTED;
		/* DDI A only supports eDP */
		if (found)
			intel_ddi_init(dev, PORT_A);

		/* DDI B, C and D detection is indicated by the SFUSE_STRAP
		 * register */
		found = I915_READ(SFUSE_STRAP);

		if (found & SFUSE_STRAP_DDIB_DETECTED)
			intel_ddi_init(dev, PORT_B);
		if (found & SFUSE_STRAP_DDIC_DETECTED)
			intel_ddi_init(dev, PORT_C);
		if (found & SFUSE_STRAP_DDID_DETECTED)
			intel_ddi_init(dev, PORT_D);
	} else if (HAS_PCH_SPLIT(dev)) {
		int found;
		dpd_is_edp = intel_dpd_is_edp(dev);

		if (has_edp_a(dev))
			intel_dp_init(dev, DP_A, PORT_A);

		if (I915_READ(HDMIB) & PORT_DETECTED) {
			/* PCH SDVOB multiplex with HDMIB */
			found = intel_sdvo_init(dev, PCH_SDVOB, true);
			if (!found)
				intel_hdmi_init(dev, HDMIB, PORT_B);
			if (!found && (I915_READ(PCH_DP_B) & DP_DETECTED))
				intel_dp_init(dev, PCH_DP_B, PORT_B);
		}

		if (I915_READ(HDMIC) & PORT_DETECTED)
			intel_hdmi_init(dev, HDMIC, PORT_C);

		if (!dpd_is_edp && I915_READ(HDMID) & PORT_DETECTED)
			intel_hdmi_init(dev, HDMID, PORT_D);

		if (I915_READ(PCH_DP_C) & DP_DETECTED)
			intel_dp_init(dev, PCH_DP_C, PORT_C);

		if (I915_READ(PCH_DP_D) & DP_DETECTED)
			intel_dp_init(dev, PCH_DP_D, PORT_D);
	} else if (IS_VALLEYVIEW(dev)) {
		/* Check for built-in panel first. Shares lanes with HDMI on SDVOC */
		if (I915_READ(VLV_DISPLAY_BASE + DP_C) & DP_DETECTED)
			intel_dp_init(dev, VLV_DISPLAY_BASE + DP_C, PORT_C);

		if (I915_READ(VLV_DISPLAY_BASE + SDVOB) & PORT_DETECTED) {
			intel_hdmi_init(dev, VLV_DISPLAY_BASE + SDVOB, PORT_B);
			if (I915_READ(VLV_DISPLAY_BASE + DP_B) & DP_DETECTED)
				intel_dp_init(dev, VLV_DISPLAY_BASE + DP_B, PORT_B);
		}

		if (I915_READ(VLV_DISPLAY_BASE + SDVOC) & PORT_DETECTED)
			intel_hdmi_init(dev, VLV_DISPLAY_BASE + SDVOC, PORT_C);

	} else if (SUPPORTS_DIGITAL_OUTPUTS(dev)) {
		bool found = false;

		if (I915_READ(SDVOB) & SDVO_DETECTED) {
			DRM_DEBUG_KMS("probing SDVOB\n");
			found = intel_sdvo_init(dev, SDVOB, true);
			if (!found && SUPPORTS_INTEGRATED_HDMI(dev)) {
				DRM_DEBUG_KMS("probing HDMI on SDVOB\n");
				intel_hdmi_init(dev, SDVOB, PORT_B);
			}

			if (!found && SUPPORTS_INTEGRATED_DP(dev)) {
				DRM_DEBUG_KMS("probing DP_B\n");
				intel_dp_init(dev, DP_B, PORT_B);
			}
		}

		/* Before G4X SDVOC doesn't have its own detect register */

		if (I915_READ(SDVOB) & SDVO_DETECTED) {
			DRM_DEBUG_KMS("probing SDVOC\n");
			found = intel_sdvo_init(dev, SDVOC, false);
		}

		if (!found && (I915_READ(SDVOC) & SDVO_DETECTED)) {

			if (SUPPORTS_INTEGRATED_HDMI(dev)) {
				DRM_DEBUG_KMS("probing HDMI on SDVOC\n");
				intel_hdmi_init(dev, SDVOC, PORT_C);
			}
			if (SUPPORTS_INTEGRATED_DP(dev)) {
				DRM_DEBUG_KMS("probing DP_C\n");
				intel_dp_init(dev, DP_C, PORT_C);
			}
		}

		if (SUPPORTS_INTEGRATED_DP(dev) &&
		    (I915_READ(DP_D) & DP_DETECTED)) {
			DRM_DEBUG_KMS("probing DP_D\n");
			intel_dp_init(dev, DP_D, PORT_D);
		}
	} else if (IS_GEN2(dev))
		intel_dvo_init(dev);

	if (SUPPORTS_TV(dev))
		intel_tv_init(dev);

	list_for_each_entry(encoder, &dev->mode_config.encoder_list, base.head) {
		encoder->base.possible_crtcs = encoder->crtc_mask;
		encoder->base.possible_clones =
			intel_encoder_clones(encoder);
	}

	intel_init_pch_refclk(dev);

	drm_helper_move_panel_connectors_to_head(dev);
}

static void intel_user_framebuffer_destroy(struct drm_framebuffer *fb)
{
	struct intel_framebuffer *intel_fb = to_intel_framebuffer(fb);

	drm_framebuffer_cleanup(fb);
	drm_gem_object_unreference_unlocked(&intel_fb->obj->base);

	kfree(intel_fb);
}

static int intel_user_framebuffer_create_handle(struct drm_framebuffer *fb,
						struct drm_file *file,
						unsigned int *handle)
{
	struct intel_framebuffer *intel_fb = to_intel_framebuffer(fb);
	struct drm_i915_gem_object *obj = intel_fb->obj;

	return drm_gem_handle_create(file, &obj->base, handle);
}

static const struct drm_framebuffer_funcs intel_fb_funcs = {
	.destroy = intel_user_framebuffer_destroy,
	.create_handle = intel_user_framebuffer_create_handle,
};

int intel_framebuffer_init(struct drm_device *dev,
			   struct intel_framebuffer *intel_fb,
			   struct drm_mode_fb_cmd2 *mode_cmd,
			   struct drm_i915_gem_object *obj)
{
	int ret;

	if (obj->tiling_mode == I915_TILING_Y) {
		DRM_DEBUG("hardware does not support tiling Y\n");
		return -EINVAL;
	}

	if (mode_cmd->pitches[0] & 63) {
		DRM_DEBUG("pitch (%d) must be at least 64 byte aligned\n",
			  mode_cmd->pitches[0]);
		return -EINVAL;
	}

	/* FIXME <= Gen4 stride limits are bit unclear */
	if (mode_cmd->pitches[0] > 32768) {
		DRM_DEBUG("pitch (%d) must be at less than 32768\n",
			  mode_cmd->pitches[0]);
		return -EINVAL;
	}

	if (obj->tiling_mode != I915_TILING_NONE &&
	    mode_cmd->pitches[0] != obj->stride) {
		DRM_DEBUG("pitch (%d) must match tiling stride (%d)\n",
			  mode_cmd->pitches[0], obj->stride);
		return -EINVAL;
	}

	/* Reject formats not supported by any plane early. */
	switch (mode_cmd->pixel_format) {
	case DRM_FORMAT_C8:
	case DRM_FORMAT_RGB565:
	case DRM_FORMAT_XRGB8888:
	case DRM_FORMAT_ARGB8888:
		break;
	case DRM_FORMAT_XRGB1555:
	case DRM_FORMAT_ARGB1555:
		if (INTEL_INFO(dev)->gen > 3) {
			DRM_DEBUG("invalid format: 0x%08x\n", mode_cmd->pixel_format);
			return -EINVAL;
		}
		break;
	case DRM_FORMAT_XBGR8888:
	case DRM_FORMAT_ABGR8888:
	case DRM_FORMAT_XRGB2101010:
	case DRM_FORMAT_ARGB2101010:
	case DRM_FORMAT_XBGR2101010:
	case DRM_FORMAT_ABGR2101010:
		if (INTEL_INFO(dev)->gen < 4) {
			DRM_DEBUG("invalid format: 0x%08x\n", mode_cmd->pixel_format);
			return -EINVAL;
		}
		break;
	case DRM_FORMAT_YUYV:
	case DRM_FORMAT_UYVY:
	case DRM_FORMAT_YVYU:
	case DRM_FORMAT_VYUY:
		if (INTEL_INFO(dev)->gen < 5) {
			DRM_DEBUG("invalid format: 0x%08x\n", mode_cmd->pixel_format);
			return -EINVAL;
		}
		break;
	default:
		DRM_DEBUG("unsupported pixel format 0x%08x\n", mode_cmd->pixel_format);
		return -EINVAL;
	}

	/* FIXME need to adjust LINOFF/TILEOFF accordingly. */
	if (mode_cmd->offsets[0] != 0)
		return -EINVAL;

	drm_helper_mode_fill_fb_struct(&intel_fb->base, mode_cmd);
	intel_fb->obj = obj;

	ret = drm_framebuffer_init(dev, &intel_fb->base, &intel_fb_funcs);
	if (ret) {
		DRM_ERROR("framebuffer init failed %d\n", ret);
		return ret;
	}

	return 0;
}

static struct drm_framebuffer *
intel_user_framebuffer_create(struct drm_device *dev,
			      struct drm_file *filp,
			      struct drm_mode_fb_cmd2 *mode_cmd)
{
	struct drm_i915_gem_object *obj;

	obj = to_intel_bo(drm_gem_object_lookup(dev, filp,
						mode_cmd->handles[0]));
	if (&obj->base == NULL)
		return ERR_PTR(-ENOENT);

	return intel_framebuffer_create(dev, mode_cmd, obj);
}

static const struct drm_mode_config_funcs intel_mode_funcs = {
	.fb_create = intel_user_framebuffer_create,
	.output_poll_changed = intel_fb_output_poll_changed,
};

/* Set up chip specific display functions */
static void intel_init_display(struct drm_device *dev)
{
	struct drm_i915_private *dev_priv = dev->dev_private;

	/* We always want a DPMS function */
	if (HAS_DDI(dev)) {
		dev_priv->display.crtc_mode_set = haswell_crtc_mode_set;
		dev_priv->display.crtc_enable = haswell_crtc_enable;
		dev_priv->display.crtc_disable = haswell_crtc_disable;
		dev_priv->display.off = haswell_crtc_off;
		dev_priv->display.update_plane = ironlake_update_plane;
	} else if (HAS_PCH_SPLIT(dev)) {
		dev_priv->display.crtc_mode_set = ironlake_crtc_mode_set;
		dev_priv->display.crtc_enable = ironlake_crtc_enable;
		dev_priv->display.crtc_disable = ironlake_crtc_disable;
		dev_priv->display.off = ironlake_crtc_off;
		dev_priv->display.update_plane = ironlake_update_plane;
	} else {
		dev_priv->display.crtc_mode_set = i9xx_crtc_mode_set;
		dev_priv->display.crtc_enable = i9xx_crtc_enable;
		dev_priv->display.crtc_disable = i9xx_crtc_disable;
		dev_priv->display.off = i9xx_crtc_off;
		dev_priv->display.update_plane = i9xx_update_plane;
	}

	/* Returns the core display clock speed */
	if (IS_VALLEYVIEW(dev))
		dev_priv->display.get_display_clock_speed =
			valleyview_get_display_clock_speed;
	else if (IS_I945G(dev) || (IS_G33(dev) && !IS_PINEVIEW_M(dev)))
		dev_priv->display.get_display_clock_speed =
			i945_get_display_clock_speed;
	else if (IS_I915G(dev))
		dev_priv->display.get_display_clock_speed =
			i915_get_display_clock_speed;
	else if (IS_I945GM(dev) || IS_845G(dev) || IS_PINEVIEW_M(dev))
		dev_priv->display.get_display_clock_speed =
			i9xx_misc_get_display_clock_speed;
	else if (IS_I915GM(dev))
		dev_priv->display.get_display_clock_speed =
			i915gm_get_display_clock_speed;
	else if (IS_I865G(dev))
		dev_priv->display.get_display_clock_speed =
			i865_get_display_clock_speed;
	else if (IS_I85X(dev))
		dev_priv->display.get_display_clock_speed =
			i855_get_display_clock_speed;
	else /* 852, 830 */
		dev_priv->display.get_display_clock_speed =
			i830_get_display_clock_speed;

	if (HAS_PCH_SPLIT(dev)) {
		if (IS_GEN5(dev)) {
			dev_priv->display.fdi_link_train = ironlake_fdi_link_train;
			dev_priv->display.write_eld = ironlake_write_eld;
		} else if (IS_GEN6(dev)) {
			dev_priv->display.fdi_link_train = gen6_fdi_link_train;
			dev_priv->display.write_eld = ironlake_write_eld;
		} else if (IS_IVYBRIDGE(dev)) {
			/* FIXME: detect B0+ stepping and use auto training */
			dev_priv->display.fdi_link_train = ivb_manual_fdi_link_train;
			dev_priv->display.write_eld = ironlake_write_eld;
			dev_priv->display.modeset_global_resources =
				ivb_modeset_global_resources;
		} else if (IS_HASWELL(dev)) {
			dev_priv->display.fdi_link_train = hsw_fdi_link_train;
			dev_priv->display.write_eld = haswell_write_eld;
			dev_priv->display.modeset_global_resources =
				haswell_modeset_global_resources;
		}
	} else if (IS_G4X(dev)) {
		dev_priv->display.write_eld = g4x_write_eld;
	}

	/* Default just returns -ENODEV to indicate unsupported */
	dev_priv->display.queue_flip = intel_default_queue_flip;

	switch (INTEL_INFO(dev)->gen) {
	case 2:
		dev_priv->display.queue_flip = intel_gen2_queue_flip;
		break;

	case 3:
		dev_priv->display.queue_flip = intel_gen3_queue_flip;
		break;

	case 4:
	case 5:
		dev_priv->display.queue_flip = intel_gen4_queue_flip;
		break;

	case 6:
		dev_priv->display.queue_flip = intel_gen6_queue_flip;
		break;
	case 7:
		dev_priv->display.queue_flip = intel_gen7_queue_flip;
		break;
	}
}

/*
 * Some BIOSes insist on assuming the GPU's pipe A is enabled at suspend,
 * resume, or other times.  This quirk makes sure that's the case for
 * affected systems.
 */
static void quirk_pipea_force(struct drm_device *dev)
{
	struct drm_i915_private *dev_priv = dev->dev_private;

	dev_priv->quirks |= QUIRK_PIPEA_FORCE;
	DRM_INFO("applying pipe a force quirk\n");
}

/*
 * Some machines (Lenovo U160) do not work with SSC on LVDS for some reason
 */
static void quirk_ssc_force_disable(struct drm_device *dev)
{
	struct drm_i915_private *dev_priv = dev->dev_private;
	dev_priv->quirks |= QUIRK_LVDS_SSC_DISABLE;
	DRM_INFO("applying lvds SSC disable quirk\n");
}

/*
 * A machine (e.g. Acer Aspire 5734Z) may need to invert the panel backlight
 * brightness value
 */
static void quirk_invert_brightness(struct drm_device *dev)
{
	struct drm_i915_private *dev_priv = dev->dev_private;
	dev_priv->quirks |= QUIRK_INVERT_BRIGHTNESS;
	DRM_INFO("applying inverted panel brightness quirk\n");
}

struct intel_quirk {
	int device;
	int subsystem_vendor;
	int subsystem_device;
	void (*hook)(struct drm_device *dev);
};

/* For systems that don't have a meaningful PCI subdevice/subvendor ID */
struct intel_dmi_quirk {
	void (*hook)(struct drm_device *dev);
	const struct dmi_system_id (*dmi_id_list)[];
};

static int intel_dmi_reverse_brightness(const struct dmi_system_id *id)
{
	DRM_INFO("Backlight polarity reversed on %s\n", id->ident);
	return 1;
}

static const struct intel_dmi_quirk intel_dmi_quirks[] = {
	{
		.dmi_id_list = &(const struct dmi_system_id[]) {
			{
				.callback = intel_dmi_reverse_brightness,
				.ident = "NCR Corporation",
				.matches = {DMI_MATCH(DMI_SYS_VENDOR, "NCR Corporation"),
					    DMI_MATCH(DMI_PRODUCT_NAME, ""),
				},
			},
			{ }  /* terminating entry */
		},
		.hook = quirk_invert_brightness,
	},
};

static struct intel_quirk intel_quirks[] = {
	/* HP Mini needs pipe A force quirk (LP: #322104) */
	{ 0x27ae, 0x103c, 0x361a, quirk_pipea_force },

	/* Toshiba Protege R-205, S-209 needs pipe A force quirk */
	{ 0x2592, 0x1179, 0x0001, quirk_pipea_force },

	/* ThinkPad T60 needs pipe A force quirk (bug #16494) */
	{ 0x2782, 0x17aa, 0x201a, quirk_pipea_force },

	/* 830/845 need to leave pipe A & dpll A up */
	{ 0x2562, PCI_ANY_ID, PCI_ANY_ID, quirk_pipea_force },
	{ 0x3577, PCI_ANY_ID, PCI_ANY_ID, quirk_pipea_force },

	/* Lenovo U160 cannot use SSC on LVDS */
	{ 0x0046, 0x17aa, 0x3920, quirk_ssc_force_disable },

	/* Sony Vaio Y cannot use SSC on LVDS */
	{ 0x0046, 0x104d, 0x9076, quirk_ssc_force_disable },

	/* Acer Aspire 5734Z must invert backlight brightness */
	{ 0x2a42, 0x1025, 0x0459, quirk_invert_brightness },

	/* Acer/eMachines G725 */
	{ 0x2a42, 0x1025, 0x0210, quirk_invert_brightness },

	/* Acer/eMachines e725 */
	{ 0x2a42, 0x1025, 0x0212, quirk_invert_brightness },

	/* Acer/Packard Bell NCL20 */
	{ 0x2a42, 0x1025, 0x034b, quirk_invert_brightness },

	/* Acer Aspire 4736Z */
	{ 0x2a42, 0x1025, 0x0260, quirk_invert_brightness },
};

static void intel_init_quirks(struct drm_device *dev)
{
	struct pci_dev *d = dev->pdev;
	int i;

	for (i = 0; i < ARRAY_SIZE(intel_quirks); i++) {
		struct intel_quirk *q = &intel_quirks[i];

		if (d->device == q->device &&
		    (d->subsystem_vendor == q->subsystem_vendor ||
		     q->subsystem_vendor == PCI_ANY_ID) &&
		    (d->subsystem_device == q->subsystem_device ||
		     q->subsystem_device == PCI_ANY_ID))
			q->hook(dev);
	}
	for (i = 0; i < ARRAY_SIZE(intel_dmi_quirks); i++) {
		if (dmi_check_system(*intel_dmi_quirks[i].dmi_id_list) != 0)
			intel_dmi_quirks[i].hook(dev);
	}
}

/* Disable the VGA plane that we never use */
static void i915_disable_vga(struct drm_device *dev)
{
	struct drm_i915_private *dev_priv = dev->dev_private;
	u8 sr1;
	u32 vga_reg = i915_vgacntrl_reg(dev);

	vga_get_uninterruptible(dev->pdev, VGA_RSRC_LEGACY_IO);
	outb(SR01, VGA_SR_INDEX);
	sr1 = inb(VGA_SR_DATA);
	outb(sr1 | 1<<5, VGA_SR_DATA);
	vga_put(dev->pdev, VGA_RSRC_LEGACY_IO);
	udelay(300);

	I915_WRITE(vga_reg, VGA_DISP_DISABLE);
	POSTING_READ(vga_reg);
}

void intel_modeset_init_hw(struct drm_device *dev)
{
	intel_init_power_well(dev);

	intel_prepare_ddi(dev);

	intel_init_clock_gating(dev);

	mutex_lock(&dev->struct_mutex);
	intel_enable_gt_powersave(dev);
	mutex_unlock(&dev->struct_mutex);
}

void intel_modeset_init(struct drm_device *dev)
{
	struct drm_i915_private *dev_priv = dev->dev_private;
	int i, ret;

	drm_mode_config_init(dev);

	dev->mode_config.min_width = 0;
	dev->mode_config.min_height = 0;

	dev->mode_config.preferred_depth = 24;
	dev->mode_config.prefer_shadow = 1;

	dev->mode_config.funcs = &intel_mode_funcs;

	intel_init_quirks(dev);

	intel_init_pm(dev);

	intel_init_display(dev);

	if (IS_GEN2(dev)) {
		dev->mode_config.max_width = 2048;
		dev->mode_config.max_height = 2048;
	} else if (IS_GEN3(dev)) {
		dev->mode_config.max_width = 4096;
		dev->mode_config.max_height = 4096;
	} else {
		dev->mode_config.max_width = 8192;
		dev->mode_config.max_height = 8192;
	}
	dev->mode_config.fb_base = dev_priv->gtt.mappable_base;

	DRM_DEBUG_KMS("%d display pipe%s available.\n",
		      dev_priv->num_pipe, dev_priv->num_pipe > 1 ? "s" : "");

	for (i = 0; i < dev_priv->num_pipe; i++) {
		intel_crtc_init(dev, i);
		ret = intel_plane_init(dev, i);
		if (ret)
			DRM_DEBUG_KMS("plane %d init failed: %d\n", i, ret);
	}

	intel_cpu_pll_init(dev);
	intel_pch_pll_init(dev);

	/* Just disable it once at startup */
	i915_disable_vga(dev);
	intel_setup_outputs(dev);

	/* Just in case the BIOS is doing something questionable. */
	intel_disable_fbc(dev);
}

static void
intel_connector_break_all_links(struct intel_connector *connector)
{
	connector->base.dpms = DRM_MODE_DPMS_OFF;
	connector->base.encoder = NULL;
	connector->encoder->connectors_active = false;
	connector->encoder->base.crtc = NULL;
}

static void intel_enable_pipe_a(struct drm_device *dev)
{
	struct intel_connector *connector;
	struct drm_connector *crt = NULL;
	struct intel_load_detect_pipe load_detect_temp;

	/* We can't just switch on the pipe A, we need to set things up with a
	 * proper mode and output configuration. As a gross hack, enable pipe A
	 * by enabling the load detect pipe once. */
	list_for_each_entry(connector,
			    &dev->mode_config.connector_list,
			    base.head) {
		if (connector->encoder->type == INTEL_OUTPUT_ANALOG) {
			crt = &connector->base;
			break;
		}
	}

	if (!crt)
		return;

	if (intel_get_load_detect_pipe(crt, NULL, &load_detect_temp))
		intel_release_load_detect_pipe(crt, &load_detect_temp);


}

static bool
intel_check_plane_mapping(struct intel_crtc *crtc)
{
	struct drm_i915_private *dev_priv = crtc->base.dev->dev_private;
	u32 reg, val;

	if (dev_priv->num_pipe == 1)
		return true;

	reg = DSPCNTR(!crtc->plane);
	val = I915_READ(reg);

	if ((val & DISPLAY_PLANE_ENABLE) &&
	    (!!(val & DISPPLANE_SEL_PIPE_MASK) == crtc->pipe))
		return false;

	return true;
}

static void intel_sanitize_crtc(struct intel_crtc *crtc)
{
	struct drm_device *dev = crtc->base.dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	u32 reg;

	/* Clear any frame start delays used for debugging left by the BIOS */
	reg = PIPECONF(crtc->cpu_transcoder);
	I915_WRITE(reg, I915_READ(reg) & ~PIPECONF_FRAME_START_DELAY_MASK);

	/* We need to sanitize the plane -> pipe mapping first because this will
	 * disable the crtc (and hence change the state) if it is wrong. Note
	 * that gen4+ has a fixed plane -> pipe mapping.  */
	if (INTEL_INFO(dev)->gen < 4 && !intel_check_plane_mapping(crtc)) {
		struct intel_connector *connector;
		bool plane;

		DRM_DEBUG_KMS("[CRTC:%d] wrong plane connection detected!\n",
			      crtc->base.base.id);

		/* Pipe has the wrong plane attached and the plane is active.
		 * Temporarily change the plane mapping and disable everything
		 * ...  */
		plane = crtc->plane;
		crtc->plane = !plane;
		dev_priv->display.crtc_disable(&crtc->base);
		crtc->plane = plane;

		/* ... and break all links. */
		list_for_each_entry(connector, &dev->mode_config.connector_list,
				    base.head) {
			if (connector->encoder->base.crtc != &crtc->base)
				continue;

			intel_connector_break_all_links(connector);
		}

		WARN_ON(crtc->active);
		crtc->base.enabled = false;
	}

	if (dev_priv->quirks & QUIRK_PIPEA_FORCE &&
	    crtc->pipe == PIPE_A && !crtc->active) {
		/* BIOS forgot to enable pipe A, this mostly happens after
		 * resume. Force-enable the pipe to fix this, the update_dpms
		 * call below we restore the pipe to the right state, but leave
		 * the required bits on. */
		intel_enable_pipe_a(dev);
	}

	/* Adjust the state of the output pipe according to whether we
	 * have active connectors/encoders. */
	intel_crtc_update_dpms(&crtc->base);

	if (crtc->active != crtc->base.enabled) {
		struct intel_encoder *encoder;

		/* This can happen either due to bugs in the get_hw_state
		 * functions or because the pipe is force-enabled due to the
		 * pipe A quirk. */
		DRM_DEBUG_KMS("[CRTC:%d] hw state adjusted, was %s, now %s\n",
			      crtc->base.base.id,
			      crtc->base.enabled ? "enabled" : "disabled",
			      crtc->active ? "enabled" : "disabled");

		crtc->base.enabled = crtc->active;

		/* Because we only establish the connector -> encoder ->
		 * crtc links if something is active, this means the
		 * crtc is now deactivated. Break the links. connector
		 * -> encoder links are only establish when things are
		 *  actually up, hence no need to break them. */
		WARN_ON(crtc->active);

		for_each_encoder_on_crtc(dev, &crtc->base, encoder) {
			WARN_ON(encoder->connectors_active);
			encoder->base.crtc = NULL;
		}
	}
}

static void intel_sanitize_encoder(struct intel_encoder *encoder)
{
	struct intel_connector *connector;
	struct drm_device *dev = encoder->base.dev;

	/* We need to check both for a crtc link (meaning that the
	 * encoder is active and trying to read from a pipe) and the
	 * pipe itself being active. */
	bool has_active_crtc = encoder->base.crtc &&
		to_intel_crtc(encoder->base.crtc)->active;

	if (encoder->connectors_active && !has_active_crtc) {
		DRM_DEBUG_KMS("[ENCODER:%d:%s] has active connectors but no active pipe!\n",
			      encoder->base.base.id,
			      drm_get_encoder_name(&encoder->base));

		/* Connector is active, but has no active pipe. This is
		 * fallout from our resume register restoring. Disable
		 * the encoder manually again. */
		if (encoder->base.crtc) {
			DRM_DEBUG_KMS("[ENCODER:%d:%s] manually disabled\n",
				      encoder->base.base.id,
				      drm_get_encoder_name(&encoder->base));
			encoder->disable(encoder);
		}

		/* Inconsistent output/port/pipe state happens presumably due to
		 * a bug in one of the get_hw_state functions. Or someplace else
		 * in our code, like the register restore mess on resume. Clamp
		 * things to off as a safer default. */
		list_for_each_entry(connector,
				    &dev->mode_config.connector_list,
				    base.head) {
			if (connector->encoder != encoder)
				continue;

			intel_connector_break_all_links(connector);
		}
	}
	/* Enabled encoders without active connectors will be fixed in
	 * the crtc fixup. */
}

void i915_redisable_vga(struct drm_device *dev)
{
	struct drm_i915_private *dev_priv = dev->dev_private;
	u32 vga_reg = i915_vgacntrl_reg(dev);

	if (I915_READ(vga_reg) != VGA_DISP_DISABLE) {
		DRM_DEBUG_KMS("Something enabled VGA plane, disabling it\n");
		i915_disable_vga(dev);
	}
}

/* Scan out the current hw modeset state, sanitizes it and maps it into the drm
 * and i915 state tracking structures. */
void intel_modeset_setup_hw_state(struct drm_device *dev,
				  bool force_restore)
{
	struct drm_i915_private *dev_priv = dev->dev_private;
	enum pipe pipe;
	u32 tmp;
	struct intel_crtc *crtc;
	struct intel_encoder *encoder;
	struct intel_connector *connector;

	if (HAS_DDI(dev)) {
		tmp = I915_READ(TRANS_DDI_FUNC_CTL(TRANSCODER_EDP));

		if (tmp & TRANS_DDI_FUNC_ENABLE) {
			switch (tmp & TRANS_DDI_EDP_INPUT_MASK) {
			case TRANS_DDI_EDP_INPUT_A_ON:
			case TRANS_DDI_EDP_INPUT_A_ONOFF:
				pipe = PIPE_A;
				break;
			case TRANS_DDI_EDP_INPUT_B_ONOFF:
				pipe = PIPE_B;
				break;
			case TRANS_DDI_EDP_INPUT_C_ONOFF:
				pipe = PIPE_C;
				break;
			}

			crtc = to_intel_crtc(dev_priv->pipe_to_crtc_mapping[pipe]);
			crtc->cpu_transcoder = TRANSCODER_EDP;

			DRM_DEBUG_KMS("Pipe %c using transcoder EDP\n",
				      pipe_name(pipe));
		}
	}

	for_each_pipe(pipe) {
		crtc = to_intel_crtc(dev_priv->pipe_to_crtc_mapping[pipe]);

		tmp = I915_READ(PIPECONF(crtc->cpu_transcoder));
		if (tmp & PIPECONF_ENABLE)
			crtc->active = true;
		else
			crtc->active = false;

		crtc->base.enabled = crtc->active;

		DRM_DEBUG_KMS("[CRTC:%d] hw state readout: %s\n",
			      crtc->base.base.id,
			      crtc->active ? "enabled" : "disabled");
	}

	if (HAS_DDI(dev))
		intel_ddi_setup_hw_pll_state(dev);

	list_for_each_entry(encoder, &dev->mode_config.encoder_list,
			    base.head) {
		pipe = 0;

		if (encoder->get_hw_state(encoder, &pipe)) {
			encoder->base.crtc =
				dev_priv->pipe_to_crtc_mapping[pipe];
		} else {
			encoder->base.crtc = NULL;
		}

		encoder->connectors_active = false;
		DRM_DEBUG_KMS("[ENCODER:%d:%s] hw state readout: %s, pipe=%i\n",
			      encoder->base.base.id,
			      drm_get_encoder_name(&encoder->base),
			      encoder->base.crtc ? "enabled" : "disabled",
			      pipe);
	}

	list_for_each_entry(connector, &dev->mode_config.connector_list,
			    base.head) {
		if (connector->get_hw_state(connector)) {
			connector->base.dpms = DRM_MODE_DPMS_ON;
			connector->encoder->connectors_active = true;
			connector->base.encoder = &connector->encoder->base;
		} else {
			connector->base.dpms = DRM_MODE_DPMS_OFF;
			connector->base.encoder = NULL;
		}
		DRM_DEBUG_KMS("[CONNECTOR:%d:%s] hw state readout: %s\n",
			      connector->base.base.id,
			      drm_get_connector_name(&connector->base),
			      connector->base.encoder ? "enabled" : "disabled");
	}

	/* HW state is read out, now we need to sanitize this mess. */
	list_for_each_entry(encoder, &dev->mode_config.encoder_list,
			    base.head) {
		intel_sanitize_encoder(encoder);
	}

	for_each_pipe(pipe) {
		crtc = to_intel_crtc(dev_priv->pipe_to_crtc_mapping[pipe]);
		intel_sanitize_crtc(crtc);
	}

	if (force_restore) {
		for_each_pipe(pipe) {
			intel_crtc_restore_mode(dev_priv->pipe_to_crtc_mapping[pipe]);
		}

		i915_redisable_vga(dev);
	} else {
		intel_modeset_update_staged_output_state(dev);
	}

	intel_modeset_check_state(dev);

	drm_mode_config_reset(dev);
}

void intel_modeset_gem_init(struct drm_device *dev)
{
	intel_modeset_init_hw(dev);

	intel_setup_overlay(dev);

	intel_modeset_setup_hw_state(dev, false);
}

void intel_modeset_cleanup(struct drm_device *dev)
{
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct drm_crtc *crtc;
	struct intel_crtc *intel_crtc;

	drm_kms_helper_poll_fini(dev);
	mutex_lock(&dev->struct_mutex);

	intel_unregister_dsm_handler();


	list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
		/* Skip inactive CRTCs */
		if (!crtc->fb)
			continue;

		intel_crtc = to_intel_crtc(crtc);
		intel_increase_pllclock(crtc);
	}

	intel_disable_fbc(dev);

	intel_disable_gt_powersave(dev);

	ironlake_teardown_rc6(dev);

	if (IS_VALLEYVIEW(dev))
		vlv_init_dpio(dev);

	mutex_unlock(&dev->struct_mutex);

	/* Disable the irq before mode object teardown, for the irq might
	 * enqueue unpin/hotplug work. */
	drm_irq_uninstall(dev);
	cancel_work_sync(&dev_priv->hotplug_work);
	cancel_work_sync(&dev_priv->rps.work);

	/* flush any delayed tasks or pending work */
	flush_scheduled_work();

	drm_mode_config_cleanup(dev);

	intel_cleanup_overlay(dev);
}

/*
 * Return which encoder is currently attached for connector.
 */
struct drm_encoder *intel_best_encoder(struct drm_connector *connector)
{
	return &intel_attached_encoder(connector)->base;
}

void intel_connector_attach_encoder(struct intel_connector *connector,
				    struct intel_encoder *encoder)
{
	connector->encoder = encoder;
	drm_mode_connector_attach_encoder(&connector->base,
					  &encoder->base);
}

/*
 * set vga decode state - true == enable VGA decode
 */
int intel_modeset_vga_set_state(struct drm_device *dev, bool state)
{
	struct drm_i915_private *dev_priv = dev->dev_private;
	u16 gmch_ctrl;

	pci_read_config_word(dev_priv->bridge_dev, INTEL_GMCH_CTRL, &gmch_ctrl);
	if (state)
		gmch_ctrl &= ~INTEL_GMCH_VGA_DISABLE;
	else
		gmch_ctrl |= INTEL_GMCH_VGA_DISABLE;
	pci_write_config_word(dev_priv->bridge_dev, INTEL_GMCH_CTRL, gmch_ctrl);
	return 0;
}

#ifdef CONFIG_DEBUG_FS
#include <linux/seq_file.h>

struct intel_display_error_state {
	struct intel_cursor_error_state {
		u32 control;
		u32 position;
		u32 base;
		u32 size;
	} cursor[I915_MAX_PIPES];

	struct intel_pipe_error_state {
		u32 conf;
		u32 source;

		u32 htotal;
		u32 hblank;
		u32 hsync;
		u32 vtotal;
		u32 vblank;
		u32 vsync;
	} pipe[I915_MAX_PIPES];

	struct intel_plane_error_state {
		u32 control;
		u32 stride;
		u32 size;
		u32 pos;
		u32 addr;
		u32 surface;
		u32 tile_offset;
	} plane[I915_MAX_PIPES];
};

struct intel_display_error_state *
intel_display_capture_error_state(struct drm_device *dev)
{
	drm_i915_private_t *dev_priv = dev->dev_private;
	struct intel_display_error_state *error;
	enum transcoder cpu_transcoder;
	int i;

	error = kmalloc(sizeof(*error), GFP_ATOMIC);
	if (error == NULL)
		return NULL;

	for_each_pipe(i) {
		cpu_transcoder = intel_pipe_to_cpu_transcoder(dev_priv, i);

		error->cursor[i].control = I915_READ(CURCNTR(i));
		error->cursor[i].position = I915_READ(CURPOS(i));
		error->cursor[i].base = I915_READ(CURBASE(i));

		error->plane[i].control = I915_READ(DSPCNTR(i));
		error->plane[i].stride = I915_READ(DSPSTRIDE(i));
		error->plane[i].size = I915_READ(DSPSIZE(i));
		error->plane[i].pos = I915_READ(DSPPOS(i));
		error->plane[i].addr = I915_READ(DSPADDR(i));
		if (INTEL_INFO(dev)->gen >= 4) {
			error->plane[i].surface = I915_READ(DSPSURF(i));
			error->plane[i].tile_offset = I915_READ(DSPTILEOFF(i));
		}

		error->pipe[i].conf = I915_READ(PIPECONF(cpu_transcoder));
		error->pipe[i].source = I915_READ(PIPESRC(i));
		error->pipe[i].htotal = I915_READ(HTOTAL(cpu_transcoder));
		error->pipe[i].hblank = I915_READ(HBLANK(cpu_transcoder));
		error->pipe[i].hsync = I915_READ(HSYNC(cpu_transcoder));
		error->pipe[i].vtotal = I915_READ(VTOTAL(cpu_transcoder));
		error->pipe[i].vblank = I915_READ(VBLANK(cpu_transcoder));
		error->pipe[i].vsync = I915_READ(VSYNC(cpu_transcoder));
	}

	return error;
}

void
intel_display_print_error_state(struct seq_file *m,
				struct drm_device *dev,
				struct intel_display_error_state *error)
{
	drm_i915_private_t *dev_priv = dev->dev_private;
	int i;

	seq_printf(m, "Num Pipes: %d\n", dev_priv->num_pipe);
	for_each_pipe(i) {
		seq_printf(m, "Pipe [%d]:\n", i);
		seq_printf(m, "  CONF: %08x\n", error->pipe[i].conf);
		seq_printf(m, "  SRC: %08x\n", error->pipe[i].source);
		seq_printf(m, "  HTOTAL: %08x\n", error->pipe[i].htotal);
		seq_printf(m, "  HBLANK: %08x\n", error->pipe[i].hblank);
		seq_printf(m, "  HSYNC: %08x\n", error->pipe[i].hsync);
		seq_printf(m, "  VTOTAL: %08x\n", error->pipe[i].vtotal);
		seq_printf(m, "  VBLANK: %08x\n", error->pipe[i].vblank);
		seq_printf(m, "  VSYNC: %08x\n", error->pipe[i].vsync);

		seq_printf(m, "Plane [%d]:\n", i);
		seq_printf(m, "  CNTR: %08x\n", error->plane[i].control);
		seq_printf(m, "  STRIDE: %08x\n", error->plane[i].stride);
		seq_printf(m, "  SIZE: %08x\n", error->plane[i].size);
		seq_printf(m, "  POS: %08x\n", error->plane[i].pos);
		seq_printf(m, "  ADDR: %08x\n", error->plane[i].addr);
		if (INTEL_INFO(dev)->gen >= 4) {
			seq_printf(m, "  SURF: %08x\n", error->plane[i].surface);
			seq_printf(m, "  TILEOFF: %08x\n", error->plane[i].tile_offset);
		}

		seq_printf(m, "Cursor [%d]:\n", i);
		seq_printf(m, "  CNTR: %08x\n", error->cursor[i].control);
		seq_printf(m, "  POS: %08x\n", error->cursor[i].position);
		seq_printf(m, "  BASE: %08x\n", error->cursor[i].base);
	}
}
#endif