drivers/gpu/drm/i915/intel_hdmi.c

/*
 * Copyright 2006 Dave Airlie <airlied@linux.ie>
 * Copyright © 2006-2009 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>
 *	Jesse Barnes <jesse.barnes@intel.com>
 */

#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/hdmi.h>
#include <drm/drmP.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_crtc.h>
#include <drm/drm_edid.h>
#include "intel_drv.h"
#include <drm/i915_drm.h>
#include "i915_drv.h"

static struct drm_device *intel_hdmi_to_dev(struct intel_hdmi *intel_hdmi)
{
	return hdmi_to_dig_port(intel_hdmi)->base.base.dev;
}

static void
assert_hdmi_port_disabled(struct intel_hdmi *intel_hdmi)
{
	struct drm_device *dev = intel_hdmi_to_dev(intel_hdmi);
	struct drm_i915_private *dev_priv = dev->dev_private;
	uint32_t enabled_bits;

	enabled_bits = HAS_DDI(dev) ? DDI_BUF_CTL_ENABLE : SDVO_ENABLE;

	WARN(I915_READ(intel_hdmi->hdmi_reg) & enabled_bits,
	     "HDMI port enabled, expecting disabled\n");
}

struct intel_hdmi *enc_to_intel_hdmi(struct drm_encoder *encoder)
{
	struct intel_digital_port *intel_dig_port =
		container_of(encoder, struct intel_digital_port, base.base);
	return &intel_dig_port->hdmi;
}

static struct intel_hdmi *intel_attached_hdmi(struct drm_connector *connector)
{
	return enc_to_intel_hdmi(&intel_attached_encoder(connector)->base);
}

static u32 g4x_infoframe_index(enum hdmi_infoframe_type type)
{
	switch (type) {
	case HDMI_INFOFRAME_TYPE_AVI:
		return VIDEO_DIP_SELECT_AVI;
	case HDMI_INFOFRAME_TYPE_SPD:
		return VIDEO_DIP_SELECT_SPD;
	case HDMI_INFOFRAME_TYPE_VENDOR:
		return VIDEO_DIP_SELECT_VENDOR;
	default:
		DRM_DEBUG_DRIVER("unknown info frame type %d\n", type);
		return 0;
	}
}

static u32 g4x_infoframe_enable(enum hdmi_infoframe_type type)
{
	switch (type) {
	case HDMI_INFOFRAME_TYPE_AVI:
		return VIDEO_DIP_ENABLE_AVI;
	case HDMI_INFOFRAME_TYPE_SPD:
		return VIDEO_DIP_ENABLE_SPD;
	case HDMI_INFOFRAME_TYPE_VENDOR:
		return VIDEO_DIP_ENABLE_VENDOR;
	default:
		DRM_DEBUG_DRIVER("unknown info frame type %d\n", type);
		return 0;
	}
}

static u32 hsw_infoframe_enable(enum hdmi_infoframe_type type)
{
	switch (type) {
	case HDMI_INFOFRAME_TYPE_AVI:
		return VIDEO_DIP_ENABLE_AVI_HSW;
	case HDMI_INFOFRAME_TYPE_SPD:
		return VIDEO_DIP_ENABLE_SPD_HSW;
	case HDMI_INFOFRAME_TYPE_VENDOR:
		return VIDEO_DIP_ENABLE_VS_HSW;
	default:
		DRM_DEBUG_DRIVER("unknown info frame type %d\n", type);
		return 0;
	}
}

static u32 hsw_dip_data_reg(struct drm_i915_private *dev_priv,
			    enum transcoder cpu_transcoder,
			    enum hdmi_infoframe_type type,
			    int i)
{
	switch (type) {
	case HDMI_INFOFRAME_TYPE_AVI:
		return HSW_TVIDEO_DIP_AVI_DATA(cpu_transcoder, i);
	case HDMI_INFOFRAME_TYPE_SPD:
		return HSW_TVIDEO_DIP_SPD_DATA(cpu_transcoder, i);
	case HDMI_INFOFRAME_TYPE_VENDOR:
		return HSW_TVIDEO_DIP_VS_DATA(cpu_transcoder, i);
	default:
		DRM_DEBUG_DRIVER("unknown info frame type %d\n", type);
		return 0;
	}
}

static void g4x_write_infoframe(struct drm_encoder *encoder,
				enum hdmi_infoframe_type type,
				const void *frame, ssize_t len)
{
	const uint32_t *data = frame;
	struct drm_device *dev = encoder->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	u32 val = I915_READ(VIDEO_DIP_CTL);
	int i;

	WARN(!(val & VIDEO_DIP_ENABLE), "Writing DIP with CTL reg disabled\n");

	val &= ~(VIDEO_DIP_SELECT_MASK | 0xf); /* clear DIP data offset */
	val |= g4x_infoframe_index(type);

	val &= ~g4x_infoframe_enable(type);

	I915_WRITE(VIDEO_DIP_CTL, val);

	mmiowb();
	for (i = 0; i < len; i += 4) {
		I915_WRITE(VIDEO_DIP_DATA, *data);
		data++;
	}
	/* Write every possible data byte to force correct ECC calculation. */
	for (; i < VIDEO_DIP_DATA_SIZE; i += 4)
		I915_WRITE(VIDEO_DIP_DATA, 0);
	mmiowb();

	val |= g4x_infoframe_enable(type);
	val &= ~VIDEO_DIP_FREQ_MASK;
	val |= VIDEO_DIP_FREQ_VSYNC;

	I915_WRITE(VIDEO_DIP_CTL, val);
	POSTING_READ(VIDEO_DIP_CTL);
}

static bool g4x_infoframe_enabled(struct drm_encoder *encoder)
{
	struct drm_device *dev = encoder->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_digital_port *intel_dig_port = enc_to_dig_port(encoder);
	u32 val = I915_READ(VIDEO_DIP_CTL);

	if ((val & VIDEO_DIP_ENABLE) == 0)
		return false;

	if ((val & VIDEO_DIP_PORT_MASK) != VIDEO_DIP_PORT(intel_dig_port->port))
		return false;

	return val & (VIDEO_DIP_ENABLE_AVI |
		      VIDEO_DIP_ENABLE_VENDOR | VIDEO_DIP_ENABLE_SPD);
}

static void ibx_write_infoframe(struct drm_encoder *encoder,
				enum hdmi_infoframe_type type,
				const void *frame, ssize_t len)
{
	const uint32_t *data = frame;
	struct drm_device *dev = encoder->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
	int i, reg = TVIDEO_DIP_CTL(intel_crtc->pipe);
	u32 val = I915_READ(reg);

	WARN(!(val & VIDEO_DIP_ENABLE), "Writing DIP with CTL reg disabled\n");

	val &= ~(VIDEO_DIP_SELECT_MASK | 0xf); /* clear DIP data offset */
	val |= g4x_infoframe_index(type);

	val &= ~g4x_infoframe_enable(type);

	I915_WRITE(reg, val);

	mmiowb();
	for (i = 0; i < len; i += 4) {
		I915_WRITE(TVIDEO_DIP_DATA(intel_crtc->pipe), *data);
		data++;
	}
	/* Write every possible data byte to force correct ECC calculation. */
	for (; i < VIDEO_DIP_DATA_SIZE; i += 4)
		I915_WRITE(TVIDEO_DIP_DATA(intel_crtc->pipe), 0);
	mmiowb();

	val |= g4x_infoframe_enable(type);
	val &= ~VIDEO_DIP_FREQ_MASK;
	val |= VIDEO_DIP_FREQ_VSYNC;

	I915_WRITE(reg, val);
	POSTING_READ(reg);
}

static bool ibx_infoframe_enabled(struct drm_encoder *encoder)
{
	struct drm_device *dev = encoder->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
	struct intel_digital_port *intel_dig_port = enc_to_dig_port(encoder);
	int reg = TVIDEO_DIP_CTL(intel_crtc->pipe);
	u32 val = I915_READ(reg);

	if ((val & VIDEO_DIP_ENABLE) == 0)
		return false;

	if ((val & VIDEO_DIP_PORT_MASK) != VIDEO_DIP_PORT(intel_dig_port->port))
		return false;

	return val & (VIDEO_DIP_ENABLE_AVI |
		      VIDEO_DIP_ENABLE_VENDOR | VIDEO_DIP_ENABLE_GAMUT |
		      VIDEO_DIP_ENABLE_SPD | VIDEO_DIP_ENABLE_GCP);
}

static void cpt_write_infoframe(struct drm_encoder *encoder,
				enum hdmi_infoframe_type type,
				const void *frame, ssize_t len)
{
	const uint32_t *data = frame;
	struct drm_device *dev = encoder->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
	int i, reg = TVIDEO_DIP_CTL(intel_crtc->pipe);
	u32 val = I915_READ(reg);

	WARN(!(val & VIDEO_DIP_ENABLE), "Writing DIP with CTL reg disabled\n");

	val &= ~(VIDEO_DIP_SELECT_MASK | 0xf); /* clear DIP data offset */
	val |= g4x_infoframe_index(type);

	/* The DIP control register spec says that we need to update the AVI
	 * infoframe without clearing its enable bit */
	if (type != HDMI_INFOFRAME_TYPE_AVI)
		val &= ~g4x_infoframe_enable(type);

	I915_WRITE(reg, val);

	mmiowb();
	for (i = 0; i < len; i += 4) {
		I915_WRITE(TVIDEO_DIP_DATA(intel_crtc->pipe), *data);
		data++;
	}
	/* Write every possible data byte to force correct ECC calculation. */
	for (; i < VIDEO_DIP_DATA_SIZE; i += 4)
		I915_WRITE(TVIDEO_DIP_DATA(intel_crtc->pipe), 0);
	mmiowb();

	val |= g4x_infoframe_enable(type);
	val &= ~VIDEO_DIP_FREQ_MASK;
	val |= VIDEO_DIP_FREQ_VSYNC;

	I915_WRITE(reg, val);
	POSTING_READ(reg);
}

static bool cpt_infoframe_enabled(struct drm_encoder *encoder)
{
	struct drm_device *dev = encoder->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
	int reg = TVIDEO_DIP_CTL(intel_crtc->pipe);
	u32 val = I915_READ(reg);

	if ((val & VIDEO_DIP_ENABLE) == 0)
		return false;

	return val & (VIDEO_DIP_ENABLE_AVI |
		      VIDEO_DIP_ENABLE_VENDOR | VIDEO_DIP_ENABLE_GAMUT |
		      VIDEO_DIP_ENABLE_SPD | VIDEO_DIP_ENABLE_GCP);
}

static void vlv_write_infoframe(struct drm_encoder *encoder,
				enum hdmi_infoframe_type type,
				const void *frame, ssize_t len)
{
	const uint32_t *data = frame;
	struct drm_device *dev = encoder->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
	int i, reg = VLV_TVIDEO_DIP_CTL(intel_crtc->pipe);
	u32 val = I915_READ(reg);

	WARN(!(val & VIDEO_DIP_ENABLE), "Writing DIP with CTL reg disabled\n");

	val &= ~(VIDEO_DIP_SELECT_MASK | 0xf); /* clear DIP data offset */
	val |= g4x_infoframe_index(type);

	val &= ~g4x_infoframe_enable(type);

	I915_WRITE(reg, val);

	mmiowb();
	for (i = 0; i < len; i += 4) {
		I915_WRITE(VLV_TVIDEO_DIP_DATA(intel_crtc->pipe), *data);
		data++;
	}
	/* Write every possible data byte to force correct ECC calculation. */
	for (; i < VIDEO_DIP_DATA_SIZE; i += 4)
		I915_WRITE(VLV_TVIDEO_DIP_DATA(intel_crtc->pipe), 0);
	mmiowb();

	val |= g4x_infoframe_enable(type);
	val &= ~VIDEO_DIP_FREQ_MASK;
	val |= VIDEO_DIP_FREQ_VSYNC;

	I915_WRITE(reg, val);
	POSTING_READ(reg);
}

static bool vlv_infoframe_enabled(struct drm_encoder *encoder)
{
	struct drm_device *dev = encoder->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
	struct intel_digital_port *intel_dig_port = enc_to_dig_port(encoder);
	int reg = VLV_TVIDEO_DIP_CTL(intel_crtc->pipe);
	u32 val = I915_READ(reg);

	if ((val & VIDEO_DIP_ENABLE) == 0)
		return false;

	if ((val & VIDEO_DIP_PORT_MASK) != VIDEO_DIP_PORT(intel_dig_port->port))
		return false;

	return val & (VIDEO_DIP_ENABLE_AVI |
		      VIDEO_DIP_ENABLE_VENDOR | VIDEO_DIP_ENABLE_GAMUT |
		      VIDEO_DIP_ENABLE_SPD | VIDEO_DIP_ENABLE_GCP);
}

static void hsw_write_infoframe(struct drm_encoder *encoder,
				enum hdmi_infoframe_type type,
				const void *frame, ssize_t len)
{
	const uint32_t *data = frame;
	struct drm_device *dev = encoder->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
	enum transcoder cpu_transcoder = intel_crtc->config->cpu_transcoder;
	u32 ctl_reg = HSW_TVIDEO_DIP_CTL(cpu_transcoder);
	u32 data_reg;
	int i;
	u32 val = I915_READ(ctl_reg);

	data_reg = hsw_dip_data_reg(dev_priv, cpu_transcoder, type, 0);
	if (data_reg == 0)
		return;

	val &= ~hsw_infoframe_enable(type);
	I915_WRITE(ctl_reg, val);

	mmiowb();
	for (i = 0; i < len; i += 4) {
		I915_WRITE(hsw_dip_data_reg(dev_priv, cpu_transcoder,
					    type, i >> 2), *data);
		data++;
	}
	/* Write every possible data byte to force correct ECC calculation. */
	for (; i < VIDEO_DIP_DATA_SIZE; i += 4)
		I915_WRITE(hsw_dip_data_reg(dev_priv, cpu_transcoder,
					    type, i >> 2), 0);
	mmiowb();

	val |= hsw_infoframe_enable(type);
	I915_WRITE(ctl_reg, val);
	POSTING_READ(ctl_reg);
}

static bool hsw_infoframe_enabled(struct drm_encoder *encoder)
{
	struct drm_device *dev = encoder->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
	u32 ctl_reg = HSW_TVIDEO_DIP_CTL(intel_crtc->config->cpu_transcoder);
	u32 val = I915_READ(ctl_reg);

	return val & (VIDEO_DIP_ENABLE_VSC_HSW | VIDEO_DIP_ENABLE_AVI_HSW |
		      VIDEO_DIP_ENABLE_GCP_HSW | VIDEO_DIP_ENABLE_VS_HSW |
		      VIDEO_DIP_ENABLE_GMP_HSW | VIDEO_DIP_ENABLE_SPD_HSW);
}

/*
 * The data we write to the DIP data buffer registers is 1 byte bigger than the
 * HDMI infoframe size because of an ECC/reserved byte at position 3 (starting
 * at 0). It's also a byte used by DisplayPort so the same DIP registers can be
 * used for both technologies.
 *
 * DW0: Reserved/ECC/DP | HB2 | HB1 | HB0
 * DW1:       DB3       | DB2 | DB1 | DB0
 * DW2:       DB7       | DB6 | DB5 | DB4
 * DW3: ...
 *
 * (HB is Header Byte, DB is Data Byte)
 *
 * The hdmi pack() functions don't know about that hardware specific hole so we
 * trick them by giving an offset into the buffer and moving back the header
 * bytes by one.
 */
static void intel_write_infoframe(struct drm_encoder *encoder,
				  union hdmi_infoframe *frame)
{
	struct intel_hdmi *intel_hdmi = enc_to_intel_hdmi(encoder);
	uint8_t buffer[VIDEO_DIP_DATA_SIZE];
	ssize_t len;

	/* see comment above for the reason for this offset */
	len = hdmi_infoframe_pack(frame, buffer + 1, sizeof(buffer) - 1);
	if (len < 0)
		return;

	/* Insert the 'hole' (see big comment above) at position 3 */
	buffer[0] = buffer[1];
	buffer[1] = buffer[2];
	buffer[2] = buffer[3];
	buffer[3] = 0;
	len++;

	intel_hdmi->write_infoframe(encoder, frame->any.type, buffer, len);
}

static void intel_hdmi_set_avi_infoframe(struct drm_encoder *encoder,
					 const struct drm_display_mode *adjusted_mode)
{
	struct intel_hdmi *intel_hdmi = enc_to_intel_hdmi(encoder);
	struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
	union hdmi_infoframe frame;
	int ret;

	ret = drm_hdmi_avi_infoframe_from_display_mode(&frame.avi,
						       adjusted_mode);
	if (ret < 0) {
		DRM_ERROR("couldn't fill AVI infoframe\n");
		return;
	}

	if (intel_hdmi->rgb_quant_range_selectable) {
		if (intel_crtc->config->limited_color_range)
			frame.avi.quantization_range =
				HDMI_QUANTIZATION_RANGE_LIMITED;
		else
			frame.avi.quantization_range =
				HDMI_QUANTIZATION_RANGE_FULL;
	}

	intel_write_infoframe(encoder, &frame);
}

static void intel_hdmi_set_spd_infoframe(struct drm_encoder *encoder)
{
	union hdmi_infoframe frame;
	int ret;

	ret = hdmi_spd_infoframe_init(&frame.spd, "Intel", "Integrated gfx");
	if (ret < 0) {
		DRM_ERROR("couldn't fill SPD infoframe\n");
		return;
	}

	frame.spd.sdi = HDMI_SPD_SDI_PC;

	intel_write_infoframe(encoder, &frame);
}

static void
intel_hdmi_set_hdmi_infoframe(struct drm_encoder *encoder,
			      const struct drm_display_mode *adjusted_mode)
{
	union hdmi_infoframe frame;
	int ret;

	ret = drm_hdmi_vendor_infoframe_from_display_mode(&frame.vendor.hdmi,
							  adjusted_mode);
	if (ret < 0)
		return;

	intel_write_infoframe(encoder, &frame);
}

static void g4x_set_infoframes(struct drm_encoder *encoder,
			       bool enable,
			       const struct drm_display_mode *adjusted_mode)
{
	struct drm_i915_private *dev_priv = encoder->dev->dev_private;
	struct intel_digital_port *intel_dig_port = enc_to_dig_port(encoder);
	struct intel_hdmi *intel_hdmi = &intel_dig_port->hdmi;
	u32 reg = VIDEO_DIP_CTL;
	u32 val = I915_READ(reg);
	u32 port = VIDEO_DIP_PORT(intel_dig_port->port);

	assert_hdmi_port_disabled(intel_hdmi);

	/* If the registers were not initialized yet, they might be zeroes,
	 * which means we're selecting the AVI DIP and we're setting its
	 * frequency to once. This seems to really confuse the HW and make
	 * things stop working (the register spec says the AVI always needs to
	 * be sent every VSync). So here we avoid writing to the register more
	 * than we need and also explicitly select the AVI DIP and explicitly
	 * set its frequency to every VSync. Avoiding to write it twice seems to
	 * be enough to solve the problem, but being defensive shouldn't hurt us
	 * either. */
	val |= VIDEO_DIP_SELECT_AVI | VIDEO_DIP_FREQ_VSYNC;

	if (!enable) {
		if (!(val & VIDEO_DIP_ENABLE))
			return;
		if (port != (val & VIDEO_DIP_PORT_MASK)) {
			DRM_DEBUG_KMS("video DIP still enabled on port %c\n",
				      (val & VIDEO_DIP_PORT_MASK) >> 29);
			return;
		}
		val &= ~(VIDEO_DIP_ENABLE | VIDEO_DIP_ENABLE_AVI |
			 VIDEO_DIP_ENABLE_VENDOR | VIDEO_DIP_ENABLE_SPD);
		I915_WRITE(reg, val);
		POSTING_READ(reg);
		return;
	}

	if (port != (val & VIDEO_DIP_PORT_MASK)) {
		if (val & VIDEO_DIP_ENABLE) {
			DRM_DEBUG_KMS("video DIP already enabled on port %c\n",
				      (val & VIDEO_DIP_PORT_MASK) >> 29);
			return;
		}
		val &= ~VIDEO_DIP_PORT_MASK;
		val |= port;
	}

	val |= VIDEO_DIP_ENABLE;
	val &= ~(VIDEO_DIP_ENABLE_AVI |
		 VIDEO_DIP_ENABLE_VENDOR | VIDEO_DIP_ENABLE_SPD);

	I915_WRITE(reg, val);
	POSTING_READ(reg);

	intel_hdmi_set_avi_infoframe(encoder, adjusted_mode);
	intel_hdmi_set_spd_infoframe(encoder);
	intel_hdmi_set_hdmi_infoframe(encoder, adjusted_mode);
}

static bool hdmi_sink_is_deep_color(struct drm_encoder *encoder)
{
	struct drm_device *dev = encoder->dev;
	struct drm_connector *connector;

	WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));

	/*
	 * HDMI cloning is only supported on g4x which doesn't
	 * support deep color or GCP infoframes anyway so no
	 * need to worry about multiple HDMI sinks here.
	 */
	list_for_each_entry(connector, &dev->mode_config.connector_list, head)
		if (connector->encoder == encoder)
			return connector->display_info.bpc > 8;

	return false;
}

/*
 * Determine if default_phase=1 can be indicated in the GCP infoframe.
 *
 * From HDMI specification 1.4a:
 * - The first pixel of each Video Data Period shall always have a pixel packing phase of 0
 * - The first pixel following each Video Data Period shall have a pixel packing phase of 0
 * - The PP bits shall be constant for all GCPs and will be equal to the last packing phase
 * - The first pixel following every transition of HSYNC or VSYNC shall have a pixel packing
 *   phase of 0
 */
static bool gcp_default_phase_possible(int pipe_bpp,
				       const struct drm_display_mode *mode)
{
	unsigned int pixels_per_group;

	switch (pipe_bpp) {
	case 30:
		/* 4 pixels in 5 clocks */
		pixels_per_group = 4;
		break;
	case 36:
		/* 2 pixels in 3 clocks */
		pixels_per_group = 2;
		break;
	case 48:
		/* 1 pixel in 2 clocks */
		pixels_per_group = 1;
		break;
	default:
		/* phase information not relevant for 8bpc */
		return false;
	}

	return mode->crtc_hdisplay % pixels_per_group == 0 &&
		mode->crtc_htotal % pixels_per_group == 0 &&
		mode->crtc_hblank_start % pixels_per_group == 0 &&
		mode->crtc_hblank_end % pixels_per_group == 0 &&
		mode->crtc_hsync_start % pixels_per_group == 0 &&
		mode->crtc_hsync_end % pixels_per_group == 0 &&
		((mode->flags & DRM_MODE_FLAG_INTERLACE) == 0 ||
		 mode->crtc_htotal/2 % pixels_per_group == 0);
}

static bool intel_hdmi_set_gcp_infoframe(struct drm_encoder *encoder)
{
	struct drm_i915_private *dev_priv = encoder->dev->dev_private;
	struct intel_crtc *crtc = to_intel_crtc(encoder->crtc);
	u32 reg, val = 0;

	if (HAS_DDI(dev_priv))
		reg = HSW_TVIDEO_DIP_GCP(crtc->config->cpu_transcoder);
	else if (IS_VALLEYVIEW(dev_priv))
		reg = VLV_TVIDEO_DIP_GCP(crtc->pipe);
	else if (HAS_PCH_SPLIT(dev_priv->dev))
		reg = TVIDEO_DIP_GCP(crtc->pipe);
	else
		return false;

	/* Indicate color depth whenever the sink supports deep color */
	if (hdmi_sink_is_deep_color(encoder))
		val |= GCP_COLOR_INDICATION;

	/* Enable default_phase whenever the display mode is suitably aligned */
	if (gcp_default_phase_possible(crtc->config->pipe_bpp,
				       &crtc->config->base.adjusted_mode))
		val |= GCP_DEFAULT_PHASE_ENABLE;

	I915_WRITE(reg, val);

	return val != 0;
}

static void ibx_set_infoframes(struct drm_encoder *encoder,
			       bool enable,
			       const struct drm_display_mode *adjusted_mode)
{
	struct drm_i915_private *dev_priv = encoder->dev->dev_private;
	struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
	struct intel_digital_port *intel_dig_port = enc_to_dig_port(encoder);
	struct intel_hdmi *intel_hdmi = &intel_dig_port->hdmi;
	u32 reg = TVIDEO_DIP_CTL(intel_crtc->pipe);
	u32 val = I915_READ(reg);
	u32 port = VIDEO_DIP_PORT(intel_dig_port->port);

	assert_hdmi_port_disabled(intel_hdmi);

	/* See the big comment in g4x_set_infoframes() */
	val |= VIDEO_DIP_SELECT_AVI | VIDEO_DIP_FREQ_VSYNC;

	if (!enable) {
		if (!(val & VIDEO_DIP_ENABLE))
			return;
		val &= ~(VIDEO_DIP_ENABLE | VIDEO_DIP_ENABLE_AVI |
			 VIDEO_DIP_ENABLE_VENDOR | VIDEO_DIP_ENABLE_GAMUT |
			 VIDEO_DIP_ENABLE_SPD | VIDEO_DIP_ENABLE_GCP);
		I915_WRITE(reg, val);
		POSTING_READ(reg);
		return;
	}

	if (port != (val & VIDEO_DIP_PORT_MASK)) {
		WARN(val & VIDEO_DIP_ENABLE,
		     "DIP already enabled on port %c\n",
		     (val & VIDEO_DIP_PORT_MASK) >> 29);
		val &= ~VIDEO_DIP_PORT_MASK;
		val |= port;
	}

	val |= VIDEO_DIP_ENABLE;
	val &= ~(VIDEO_DIP_ENABLE_AVI |
		 VIDEO_DIP_ENABLE_VENDOR | VIDEO_DIP_ENABLE_GAMUT |
		 VIDEO_DIP_ENABLE_SPD | VIDEO_DIP_ENABLE_GCP);

	if (intel_hdmi_set_gcp_infoframe(encoder))
		val |= VIDEO_DIP_ENABLE_GCP;

	I915_WRITE(reg, val);
	POSTING_READ(reg);

	intel_hdmi_set_avi_infoframe(encoder, adjusted_mode);
	intel_hdmi_set_spd_infoframe(encoder);
	intel_hdmi_set_hdmi_infoframe(encoder, adjusted_mode);
}

static void cpt_set_infoframes(struct drm_encoder *encoder,
			       bool enable,
			       const struct drm_display_mode *adjusted_mode)
{
	struct drm_i915_private *dev_priv = encoder->dev->dev_private;
	struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
	struct intel_hdmi *intel_hdmi = enc_to_intel_hdmi(encoder);
	u32 reg = TVIDEO_DIP_CTL(intel_crtc->pipe);
	u32 val = I915_READ(reg);

	assert_hdmi_port_disabled(intel_hdmi);

	/* See the big comment in g4x_set_infoframes() */
	val |= VIDEO_DIP_SELECT_AVI | VIDEO_DIP_FREQ_VSYNC;

	if (!enable) {
		if (!(val & VIDEO_DIP_ENABLE))
			return;
		val &= ~(VIDEO_DIP_ENABLE | VIDEO_DIP_ENABLE_AVI |
			 VIDEO_DIP_ENABLE_VENDOR | VIDEO_DIP_ENABLE_GAMUT |
			 VIDEO_DIP_ENABLE_SPD | VIDEO_DIP_ENABLE_GCP);
		I915_WRITE(reg, val);
		POSTING_READ(reg);
		return;
	}

	/* Set both together, unset both together: see the spec. */
	val |= VIDEO_DIP_ENABLE | VIDEO_DIP_ENABLE_AVI;
	val &= ~(VIDEO_DIP_ENABLE_VENDOR | VIDEO_DIP_ENABLE_GAMUT |
		 VIDEO_DIP_ENABLE_SPD | VIDEO_DIP_ENABLE_GCP);

	if (intel_hdmi_set_gcp_infoframe(encoder))
		val |= VIDEO_DIP_ENABLE_GCP;

	I915_WRITE(reg, val);
	POSTING_READ(reg);

	intel_hdmi_set_avi_infoframe(encoder, adjusted_mode);
	intel_hdmi_set_spd_infoframe(encoder);
	intel_hdmi_set_hdmi_infoframe(encoder, adjusted_mode);
}

static void vlv_set_infoframes(struct drm_encoder *encoder,
			       bool enable,
			       const struct drm_display_mode *adjusted_mode)
{
	struct drm_i915_private *dev_priv = encoder->dev->dev_private;
	struct intel_digital_port *intel_dig_port = enc_to_dig_port(encoder);
	struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
	struct intel_hdmi *intel_hdmi = enc_to_intel_hdmi(encoder);
	u32 reg = VLV_TVIDEO_DIP_CTL(intel_crtc->pipe);
	u32 val = I915_READ(reg);
	u32 port = VIDEO_DIP_PORT(intel_dig_port->port);

	assert_hdmi_port_disabled(intel_hdmi);

	/* See the big comment in g4x_set_infoframes() */
	val |= VIDEO_DIP_SELECT_AVI | VIDEO_DIP_FREQ_VSYNC;

	if (!enable) {
		if (!(val & VIDEO_DIP_ENABLE))
			return;
		val &= ~(VIDEO_DIP_ENABLE | VIDEO_DIP_ENABLE_AVI |
			 VIDEO_DIP_ENABLE_VENDOR | VIDEO_DIP_ENABLE_GAMUT |
			 VIDEO_DIP_ENABLE_SPD | VIDEO_DIP_ENABLE_GCP);
		I915_WRITE(reg, val);
		POSTING_READ(reg);
		return;
	}

	if (port != (val & VIDEO_DIP_PORT_MASK)) {
		WARN(val & VIDEO_DIP_ENABLE,
		     "DIP already enabled on port %c\n",
		     (val & VIDEO_DIP_PORT_MASK) >> 29);
		val &= ~VIDEO_DIP_PORT_MASK;
		val |= port;
	}

	val |= VIDEO_DIP_ENABLE;
	val &= ~(VIDEO_DIP_ENABLE_AVI |
		 VIDEO_DIP_ENABLE_VENDOR | VIDEO_DIP_ENABLE_GAMUT |
		 VIDEO_DIP_ENABLE_SPD | VIDEO_DIP_ENABLE_GCP);

	if (intel_hdmi_set_gcp_infoframe(encoder))
		val |= VIDEO_DIP_ENABLE_GCP;

	I915_WRITE(reg, val);
	POSTING_READ(reg);

	intel_hdmi_set_avi_infoframe(encoder, adjusted_mode);
	intel_hdmi_set_spd_infoframe(encoder);
	intel_hdmi_set_hdmi_infoframe(encoder, adjusted_mode);
}

static void hsw_set_infoframes(struct drm_encoder *encoder,
			       bool enable,
			       const struct drm_display_mode *adjusted_mode)
{
	struct drm_i915_private *dev_priv = encoder->dev->dev_private;
	struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
	struct intel_hdmi *intel_hdmi = enc_to_intel_hdmi(encoder);
	u32 reg = HSW_TVIDEO_DIP_CTL(intel_crtc->config->cpu_transcoder);
	u32 val = I915_READ(reg);

	assert_hdmi_port_disabled(intel_hdmi);

	val &= ~(VIDEO_DIP_ENABLE_VSC_HSW | VIDEO_DIP_ENABLE_AVI_HSW |
		 VIDEO_DIP_ENABLE_GCP_HSW | VIDEO_DIP_ENABLE_VS_HSW |
		 VIDEO_DIP_ENABLE_GMP_HSW | VIDEO_DIP_ENABLE_SPD_HSW);

	if (!enable) {
		I915_WRITE(reg, val);
		POSTING_READ(reg);
		return;
	}

	if (intel_hdmi_set_gcp_infoframe(encoder))
		val |= VIDEO_DIP_ENABLE_GCP_HSW;

	I915_WRITE(reg, val);
	POSTING_READ(reg);

	intel_hdmi_set_avi_infoframe(encoder, adjusted_mode);
	intel_hdmi_set_spd_infoframe(encoder);
	intel_hdmi_set_hdmi_infoframe(encoder, adjusted_mode);
}

static void intel_hdmi_prepare(struct intel_encoder *encoder)
{
	struct drm_device *dev = encoder->base.dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_crtc *crtc = to_intel_crtc(encoder->base.crtc);
	struct intel_hdmi *intel_hdmi = enc_to_intel_hdmi(&encoder->base);
	const struct drm_display_mode *adjusted_mode = &crtc->config->base.adjusted_mode;
	u32 hdmi_val;

	hdmi_val = SDVO_ENCODING_HDMI;
	if (!HAS_PCH_SPLIT(dev) && crtc->config->limited_color_range)
		hdmi_val |= HDMI_COLOR_RANGE_16_235;
	if (adjusted_mode->flags & DRM_MODE_FLAG_PVSYNC)
		hdmi_val |= SDVO_VSYNC_ACTIVE_HIGH;
	if (adjusted_mode->flags & DRM_MODE_FLAG_PHSYNC)
		hdmi_val |= SDVO_HSYNC_ACTIVE_HIGH;

	if (crtc->config->pipe_bpp > 24)
		hdmi_val |= HDMI_COLOR_FORMAT_12bpc;
	else
		hdmi_val |= SDVO_COLOR_FORMAT_8bpc;

	if (crtc->config->has_hdmi_sink)
		hdmi_val |= HDMI_MODE_SELECT_HDMI;

	if (HAS_PCH_CPT(dev))
		hdmi_val |= SDVO_PIPE_SEL_CPT(crtc->pipe);
	else if (IS_CHERRYVIEW(dev))
		hdmi_val |= SDVO_PIPE_SEL_CHV(crtc->pipe);
	else
		hdmi_val |= SDVO_PIPE_SEL(crtc->pipe);

	I915_WRITE(intel_hdmi->hdmi_reg, hdmi_val);
	POSTING_READ(intel_hdmi->hdmi_reg);
}

static bool intel_hdmi_get_hw_state(struct intel_encoder *encoder,
				    enum pipe *pipe)
{
	struct drm_device *dev = encoder->base.dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_hdmi *intel_hdmi = enc_to_intel_hdmi(&encoder->base);
	enum intel_display_power_domain power_domain;
	u32 tmp;

	power_domain = intel_display_port_power_domain(encoder);
	if (!intel_display_power_is_enabled(dev_priv, power_domain))
		return false;

	tmp = I915_READ(intel_hdmi->hdmi_reg);

	if (!(tmp & SDVO_ENABLE))
		return false;

	if (HAS_PCH_CPT(dev))
		*pipe = PORT_TO_PIPE_CPT(tmp);
	else if (IS_CHERRYVIEW(dev))
		*pipe = SDVO_PORT_TO_PIPE_CHV(tmp);
	else
		*pipe = PORT_TO_PIPE(tmp);

	return true;
}

static void intel_hdmi_get_config(struct intel_encoder *encoder,
				  struct intel_crtc_state *pipe_config)
{
	struct intel_hdmi *intel_hdmi = enc_to_intel_hdmi(&encoder->base);
	struct drm_device *dev = encoder->base.dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	u32 tmp, flags = 0;
	int dotclock;

	tmp = I915_READ(intel_hdmi->hdmi_reg);

	if (tmp & SDVO_HSYNC_ACTIVE_HIGH)
		flags |= DRM_MODE_FLAG_PHSYNC;
	else
		flags |= DRM_MODE_FLAG_NHSYNC;

	if (tmp & SDVO_VSYNC_ACTIVE_HIGH)
		flags |= DRM_MODE_FLAG_PVSYNC;
	else
		flags |= DRM_MODE_FLAG_NVSYNC;

	if (tmp & HDMI_MODE_SELECT_HDMI)
		pipe_config->has_hdmi_sink = true;

	if (intel_hdmi->infoframe_enabled(&encoder->base))
		pipe_config->has_infoframe = true;

	if (tmp & SDVO_AUDIO_ENABLE)
		pipe_config->has_audio = true;

	if (!HAS_PCH_SPLIT(dev) &&
	    tmp & HDMI_COLOR_RANGE_16_235)
		pipe_config->limited_color_range = true;

	pipe_config->base.adjusted_mode.flags |= flags;

	if ((tmp & SDVO_COLOR_FORMAT_MASK) == HDMI_COLOR_FORMAT_12bpc)
		dotclock = pipe_config->port_clock * 2 / 3;
	else
		dotclock = pipe_config->port_clock;

	if (pipe_config->pixel_multiplier)
		dotclock /= pipe_config->pixel_multiplier;

	if (HAS_PCH_SPLIT(dev_priv->dev))
		ironlake_check_encoder_dotclock(pipe_config, dotclock);

	pipe_config->base.adjusted_mode.crtc_clock = dotclock;
}

static void intel_enable_hdmi_audio(struct intel_encoder *encoder)
{
	struct intel_crtc *crtc = to_intel_crtc(encoder->base.crtc);

	WARN_ON(!crtc->config->has_hdmi_sink);
	DRM_DEBUG_DRIVER("Enabling HDMI audio on pipe %c\n",
			 pipe_name(crtc->pipe));
	intel_audio_codec_enable(encoder);
}

static void g4x_enable_hdmi(struct intel_encoder *encoder)
{
	struct drm_device *dev = encoder->base.dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_crtc *crtc = to_intel_crtc(encoder->base.crtc);
	struct intel_hdmi *intel_hdmi = enc_to_intel_hdmi(&encoder->base);
	u32 temp;

	temp = I915_READ(intel_hdmi->hdmi_reg);

	temp |= SDVO_ENABLE;
	if (crtc->config->has_audio)
		temp |= SDVO_AUDIO_ENABLE;

	I915_WRITE(intel_hdmi->hdmi_reg, temp);
	POSTING_READ(intel_hdmi->hdmi_reg);

	if (crtc->config->has_audio)
		intel_enable_hdmi_audio(encoder);
}

static void ibx_enable_hdmi(struct intel_encoder *encoder)
{
	struct drm_device *dev = encoder->base.dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_crtc *crtc = to_intel_crtc(encoder->base.crtc);
	struct intel_hdmi *intel_hdmi = enc_to_intel_hdmi(&encoder->base);
	u32 temp;

	temp = I915_READ(intel_hdmi->hdmi_reg);

	temp |= SDVO_ENABLE;
	if (crtc->config->has_audio)
		temp |= SDVO_AUDIO_ENABLE;

	/*
	 * HW workaround, need to write this twice for issue
	 * that may result in first write getting masked.
	 */
	I915_WRITE(intel_hdmi->hdmi_reg, temp);
	POSTING_READ(intel_hdmi->hdmi_reg);
	I915_WRITE(intel_hdmi->hdmi_reg, temp);
	POSTING_READ(intel_hdmi->hdmi_reg);

	/*
	 * HW workaround, need to toggle enable bit off and on
	 * for 12bpc with pixel repeat.
	 *
	 * FIXME: BSpec says this should be done at the end of
	 * of the modeset sequence, so not sure if this isn't too soon.
	 */
	if (crtc->config->pipe_bpp > 24 &&
	    crtc->config->pixel_multiplier > 1) {
		I915_WRITE(intel_hdmi->hdmi_reg, temp & ~SDVO_ENABLE);
		POSTING_READ(intel_hdmi->hdmi_reg);

		/*
		 * HW workaround, need to write this twice for issue
		 * that may result in first write getting masked.
		 */
		I915_WRITE(intel_hdmi->hdmi_reg, temp);
		POSTING_READ(intel_hdmi->hdmi_reg);
		I915_WRITE(intel_hdmi->hdmi_reg, temp);
		POSTING_READ(intel_hdmi->hdmi_reg);
	}

	if (crtc->config->has_audio)
		intel_enable_hdmi_audio(encoder);
}

static void cpt_enable_hdmi(struct intel_encoder *encoder)
{
	struct drm_device *dev = encoder->base.dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_crtc *crtc = to_intel_crtc(encoder->base.crtc);
	struct intel_hdmi *intel_hdmi = enc_to_intel_hdmi(&encoder->base);
	enum pipe pipe = crtc->pipe;
	u32 temp;

	temp = I915_READ(intel_hdmi->hdmi_reg);

	temp |= SDVO_ENABLE;
	if (crtc->config->has_audio)
		temp |= SDVO_AUDIO_ENABLE;

	/*
	 * WaEnableHDMI8bpcBefore12bpc:snb,ivb
	 *
	 * The procedure for 12bpc is as follows:
	 * 1. disable HDMI clock gating
	 * 2. enable HDMI with 8bpc
	 * 3. enable HDMI with 12bpc
	 * 4. enable HDMI clock gating
	 */

	if (crtc->config->pipe_bpp > 24) {
		I915_WRITE(TRANS_CHICKEN1(pipe),
			   I915_READ(TRANS_CHICKEN1(pipe)) |
			   TRANS_CHICKEN1_HDMIUNIT_GC_DISABLE);

		temp &= ~SDVO_COLOR_FORMAT_MASK;
		temp |= SDVO_COLOR_FORMAT_8bpc;
	}

	I915_WRITE(intel_hdmi->hdmi_reg, temp);
	POSTING_READ(intel_hdmi->hdmi_reg);

	if (crtc->config->pipe_bpp > 24) {
		temp &= ~SDVO_COLOR_FORMAT_MASK;
		temp |= HDMI_COLOR_FORMAT_12bpc;

		I915_WRITE(intel_hdmi->hdmi_reg, temp);
		POSTING_READ(intel_hdmi->hdmi_reg);

		I915_WRITE(TRANS_CHICKEN1(pipe),
			   I915_READ(TRANS_CHICKEN1(pipe)) &
			   ~TRANS_CHICKEN1_HDMIUNIT_GC_DISABLE);
	}

	if (crtc->config->has_audio)
		intel_enable_hdmi_audio(encoder);
}

static void vlv_enable_hdmi(struct intel_encoder *encoder)
{
}

static void intel_disable_hdmi(struct intel_encoder *encoder)
{
	struct drm_device *dev = encoder->base.dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_hdmi *intel_hdmi = enc_to_intel_hdmi(&encoder->base);
	struct intel_crtc *crtc = to_intel_crtc(encoder->base.crtc);
	u32 temp;

	temp = I915_READ(intel_hdmi->hdmi_reg);

	temp &= ~(SDVO_ENABLE | SDVO_AUDIO_ENABLE);
	I915_WRITE(intel_hdmi->hdmi_reg, temp);
	POSTING_READ(intel_hdmi->hdmi_reg);

	/*
	 * HW workaround for IBX, we need to move the port
	 * to transcoder A after disabling it to allow the
	 * matching DP port to be enabled on transcoder A.
	 */
	if (HAS_PCH_IBX(dev) && crtc->pipe == PIPE_B) {
		temp &= ~SDVO_PIPE_B_SELECT;
		temp |= SDVO_ENABLE;
		/*
		 * HW workaround, need to write this twice for issue
		 * that may result in first write getting masked.
		 */
		I915_WRITE(intel_hdmi->hdmi_reg, temp);
		POSTING_READ(intel_hdmi->hdmi_reg);
		I915_WRITE(intel_hdmi->hdmi_reg, temp);
		POSTING_READ(intel_hdmi->hdmi_reg);

		temp &= ~SDVO_ENABLE;
		I915_WRITE(intel_hdmi->hdmi_reg, temp);
		POSTING_READ(intel_hdmi->hdmi_reg);
	}

	intel_hdmi->set_infoframes(&encoder->base, false, NULL);
}

static void g4x_disable_hdmi(struct intel_encoder *encoder)
{
	struct intel_crtc *crtc = to_intel_crtc(encoder->base.crtc);

	if (crtc->config->has_audio)
		intel_audio_codec_disable(encoder);

	intel_disable_hdmi(encoder);
}

static void pch_disable_hdmi(struct intel_encoder *encoder)
{
	struct intel_crtc *crtc = to_intel_crtc(encoder->base.crtc);

	if (crtc->config->has_audio)
		intel_audio_codec_disable(encoder);
}

static void pch_post_disable_hdmi(struct intel_encoder *encoder)
{
	intel_disable_hdmi(encoder);
}

static int hdmi_port_clock_limit(struct intel_hdmi *hdmi, bool respect_dvi_limit)
{
	struct drm_device *dev = intel_hdmi_to_dev(hdmi);

	if ((respect_dvi_limit && !hdmi->has_hdmi_sink) || IS_G4X(dev))
		return 165000;
	else if (IS_HASWELL(dev) || INTEL_INFO(dev)->gen >= 8)
		return 300000;
	else
		return 225000;
}

static enum drm_mode_status
hdmi_port_clock_valid(struct intel_hdmi *hdmi,
		      int clock, bool respect_dvi_limit)
{
	struct drm_device *dev = intel_hdmi_to_dev(hdmi);

	if (clock < 25000)
		return MODE_CLOCK_LOW;
	if (clock > hdmi_port_clock_limit(hdmi, respect_dvi_limit))
		return MODE_CLOCK_HIGH;

	/* BXT DPLL can't generate 223-240 MHz */
	if (IS_BROXTON(dev) && clock > 223333 && clock < 240000)
		return MODE_CLOCK_RANGE;

	/* CHV DPLL can't generate 216-240 MHz */
	if (IS_CHERRYVIEW(dev) && clock > 216000 && clock < 240000)
		return MODE_CLOCK_RANGE;

	return MODE_OK;
}

static enum drm_mode_status
intel_hdmi_mode_valid(struct drm_connector *connector,
		      struct drm_display_mode *mode)
{
	struct intel_hdmi *hdmi = intel_attached_hdmi(connector);
	struct drm_device *dev = intel_hdmi_to_dev(hdmi);
	enum drm_mode_status status;
	int clock;

	if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
		return MODE_NO_DBLESCAN;

	clock = mode->clock;
	if (mode->flags & DRM_MODE_FLAG_DBLCLK)
		clock *= 2;

	/* check if we can do 8bpc */
	status = hdmi_port_clock_valid(hdmi, clock, true);

	/* if we can't do 8bpc we may still be able to do 12bpc */
	if (!HAS_GMCH_DISPLAY(dev) && status != MODE_OK)
		status = hdmi_port_clock_valid(hdmi, clock * 3 / 2, true);

	return status;
}

static bool hdmi_12bpc_possible(struct intel_crtc_state *crtc_state)
{
	struct drm_device *dev = crtc_state->base.crtc->dev;
	struct drm_atomic_state *state;
	struct intel_encoder *encoder;
	struct drm_connector *connector;
	struct drm_connector_state *connector_state;
	int count = 0, count_hdmi = 0;
	int i;

	if (HAS_GMCH_DISPLAY(dev))
		return false;

	state = crtc_state->base.state;

	for_each_connector_in_state(state, connector, connector_state, i) {
		if (connector_state->crtc != crtc_state->base.crtc)
			continue;

		encoder = to_intel_encoder(connector_state->best_encoder);

		count_hdmi += encoder->type == INTEL_OUTPUT_HDMI;
		count++;
	}

	/*
	 * HDMI 12bpc affects the clocks, so it's only possible
	 * when not cloning with other encoder types.
	 */
	return count_hdmi > 0 && count_hdmi == count;
}

bool intel_hdmi_compute_config(struct intel_encoder *encoder,
			       struct intel_crtc_state *pipe_config)
{
	struct intel_hdmi *intel_hdmi = enc_to_intel_hdmi(&encoder->base);
	struct drm_device *dev = encoder->base.dev;
	struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
	int clock_8bpc = pipe_config->base.adjusted_mode.crtc_clock;
	int clock_12bpc = clock_8bpc * 3 / 2;
	int desired_bpp;

	pipe_config->has_hdmi_sink = intel_hdmi->has_hdmi_sink;

	if (pipe_config->has_hdmi_sink)
		pipe_config->has_infoframe = true;

	if (intel_hdmi->color_range_auto) {
		/* See CEA-861-E - 5.1 Default Encoding Parameters */
		pipe_config->limited_color_range =
			pipe_config->has_hdmi_sink &&
			drm_match_cea_mode(adjusted_mode) > 1;
	} else {
		pipe_config->limited_color_range =
			intel_hdmi->limited_color_range;
	}

	if (adjusted_mode->flags & DRM_MODE_FLAG_DBLCLK) {
		pipe_config->pixel_multiplier = 2;
		clock_8bpc *= 2;
		clock_12bpc *= 2;
	}

	if (HAS_PCH_SPLIT(dev) && !HAS_DDI(dev))
		pipe_config->has_pch_encoder = true;

	if (pipe_config->has_hdmi_sink && intel_hdmi->has_audio)
		pipe_config->has_audio = true;

	/*
	 * HDMI is either 12 or 8, so if the display lets 10bpc sneak
	 * through, clamp it down. Note that g4x/vlv don't support 12bpc hdmi
	 * outputs. We also need to check that the higher clock still fits
	 * within limits.
	 */
	if (pipe_config->pipe_bpp > 8*3 && pipe_config->has_hdmi_sink &&
	    hdmi_port_clock_valid(intel_hdmi, clock_12bpc, false) == MODE_OK &&
	    hdmi_12bpc_possible(pipe_config)) {
		DRM_DEBUG_KMS("picking bpc to 12 for HDMI output\n");
		desired_bpp = 12*3;

		/* Need to adjust the port link by 1.5x for 12bpc. */
		pipe_config->port_clock = clock_12bpc;
	} else {
		DRM_DEBUG_KMS("picking bpc to 8 for HDMI output\n");
		desired_bpp = 8*3;

		pipe_config->port_clock = clock_8bpc;
	}

	if (!pipe_config->bw_constrained) {
		DRM_DEBUG_KMS("forcing pipe bpc to %i for HDMI\n", desired_bpp);
		pipe_config->pipe_bpp = desired_bpp;
	}

	if (hdmi_port_clock_valid(intel_hdmi, pipe_config->port_clock,
				  false) != MODE_OK) {
		DRM_DEBUG_KMS("unsupported HDMI clock, rejecting mode\n");
		return false;
	}

	/* Set user selected PAR to incoming mode's member */
	adjusted_mode->picture_aspect_ratio = intel_hdmi->aspect_ratio;

	return true;
}

static void
intel_hdmi_unset_edid(struct drm_connector *connector)
{
	struct intel_hdmi *intel_hdmi = intel_attached_hdmi(connector);

	intel_hdmi->has_hdmi_sink = false;
	intel_hdmi->has_audio = false;
	intel_hdmi->rgb_quant_range_selectable = false;

	kfree(to_intel_connector(connector)->detect_edid);
	to_intel_connector(connector)->detect_edid = NULL;
}

static bool
intel_hdmi_set_edid(struct drm_connector *connector, bool force)
{
	struct drm_i915_private *dev_priv = to_i915(connector->dev);
	struct intel_hdmi *intel_hdmi = intel_attached_hdmi(connector);
	struct edid *edid = NULL;
	bool connected = false;

	intel_display_power_get(dev_priv, POWER_DOMAIN_GMBUS);

	if (force)
		edid = drm_get_edid(connector,
				    intel_gmbus_get_adapter(dev_priv,
				    intel_hdmi->ddc_bus));

	intel_display_power_put(dev_priv, POWER_DOMAIN_GMBUS);

	to_intel_connector(connector)->detect_edid = edid;
	if (edid && edid->input & DRM_EDID_INPUT_DIGITAL) {
		intel_hdmi->rgb_quant_range_selectable =
			drm_rgb_quant_range_selectable(edid);

		intel_hdmi->has_audio = drm_detect_monitor_audio(edid);
		if (intel_hdmi->force_audio != HDMI_AUDIO_AUTO)
			intel_hdmi->has_audio =
				intel_hdmi->force_audio == HDMI_AUDIO_ON;

		if (intel_hdmi->force_audio != HDMI_AUDIO_OFF_DVI)
			intel_hdmi->has_hdmi_sink =
				drm_detect_hdmi_monitor(edid);

		connected = true;
	}

	return connected;
}

static enum drm_connector_status
intel_hdmi_detect(struct drm_connector *connector, bool force)
{
	enum drm_connector_status status;
	struct intel_hdmi *intel_hdmi = intel_attached_hdmi(connector);
	struct drm_i915_private *dev_priv = to_i915(connector->dev);
	bool live_status = false;
	unsigned int retry = 3;

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

	intel_display_power_get(dev_priv, POWER_DOMAIN_GMBUS);

	while (!live_status && --retry) {
		live_status = intel_digital_port_connected(dev_priv,
				hdmi_to_dig_port(intel_hdmi));
		msleep(10);
	}

	if (!live_status)
		DRM_DEBUG_KMS("Live status not up!");

	intel_hdmi_unset_edid(connector);

	if (intel_hdmi_set_edid(connector, live_status)) {
		struct intel_hdmi *intel_hdmi = intel_attached_hdmi(connector);

		hdmi_to_dig_port(intel_hdmi)->base.type = INTEL_OUTPUT_HDMI;
		status = connector_status_connected;
	} else
		status = connector_status_disconnected;

	intel_display_power_put(dev_priv, POWER_DOMAIN_GMBUS);

	return status;
}

static void
intel_hdmi_force(struct drm_connector *connector)
{
	struct intel_hdmi *intel_hdmi = intel_attached_hdmi(connector);

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

	intel_hdmi_unset_edid(connector);

	if (connector->status != connector_status_connected)
		return;

	intel_hdmi_set_edid(connector, true);
	hdmi_to_dig_port(intel_hdmi)->base.type = INTEL_OUTPUT_HDMI;
}

static int intel_hdmi_get_modes(struct drm_connector *connector)
{
	struct edid *edid;

	edid = to_intel_connector(connector)->detect_edid;
	if (edid == NULL)
		return 0;

	return intel_connector_update_modes(connector, edid);
}

static bool
intel_hdmi_detect_audio(struct drm_connector *connector)
{
	bool has_audio = false;
	struct edid *edid;

	edid = to_intel_connector(connector)->detect_edid;
	if (edid && edid->input & DRM_EDID_INPUT_DIGITAL)
		has_audio = drm_detect_monitor_audio(edid);

	return has_audio;
}

static int
intel_hdmi_set_property(struct drm_connector *connector,
			struct drm_property *property,
			uint64_t val)
{
	struct intel_hdmi *intel_hdmi = intel_attached_hdmi(connector);
	struct intel_digital_port *intel_dig_port =
		hdmi_to_dig_port(intel_hdmi);
	struct drm_i915_private *dev_priv = connector->dev->dev_private;
	int ret;

	ret = drm_object_property_set_value(&connector->base, property, val);
	if (ret)
		return ret;

	if (property == dev_priv->force_audio_property) {
		enum hdmi_force_audio i = val;
		bool has_audio;

		if (i == intel_hdmi->force_audio)
			return 0;

		intel_hdmi->force_audio = i;

		if (i == HDMI_AUDIO_AUTO)
			has_audio = intel_hdmi_detect_audio(connector);
		else
			has_audio = (i == HDMI_AUDIO_ON);

		if (i == HDMI_AUDIO_OFF_DVI)
			intel_hdmi->has_hdmi_sink = 0;

		intel_hdmi->has_audio = has_audio;
		goto done;
	}

	if (property == dev_priv->broadcast_rgb_property) {
		bool old_auto = intel_hdmi->color_range_auto;
		bool old_range = intel_hdmi->limited_color_range;

		switch (val) {
		case INTEL_BROADCAST_RGB_AUTO:
			intel_hdmi->color_range_auto = true;
			break;
		case INTEL_BROADCAST_RGB_FULL:
			intel_hdmi->color_range_auto = false;
			intel_hdmi->limited_color_range = false;
			break;
		case INTEL_BROADCAST_RGB_LIMITED:
			intel_hdmi->color_range_auto = false;
			intel_hdmi->limited_color_range = true;
			break;
		default:
			return -EINVAL;
		}

		if (old_auto == intel_hdmi->color_range_auto &&
		    old_range == intel_hdmi->limited_color_range)
			return 0;

		goto done;
	}

	if (property == connector->dev->mode_config.aspect_ratio_property) {
		switch (val) {
		case DRM_MODE_PICTURE_ASPECT_NONE:
			intel_hdmi->aspect_ratio = HDMI_PICTURE_ASPECT_NONE;
			break;
		case DRM_MODE_PICTURE_ASPECT_4_3:
			intel_hdmi->aspect_ratio = HDMI_PICTURE_ASPECT_4_3;
			break;
		case DRM_MODE_PICTURE_ASPECT_16_9:
			intel_hdmi->aspect_ratio = HDMI_PICTURE_ASPECT_16_9;
			break;
		default:
			return -EINVAL;
		}
		goto done;
	}

	return -EINVAL;

done:
	if (intel_dig_port->base.base.crtc)
		intel_crtc_restore_mode(intel_dig_port->base.base.crtc);

	return 0;
}

static void intel_hdmi_pre_enable(struct intel_encoder *encoder)
{
	struct intel_hdmi *intel_hdmi = enc_to_intel_hdmi(&encoder->base);
	struct intel_crtc *intel_crtc = to_intel_crtc(encoder->base.crtc);
	const struct drm_display_mode *adjusted_mode = &intel_crtc->config->base.adjusted_mode;

	intel_hdmi_prepare(encoder);

	intel_hdmi->set_infoframes(&encoder->base,
				   intel_crtc->config->has_hdmi_sink,
				   adjusted_mode);
}

static void vlv_hdmi_pre_enable(struct intel_encoder *encoder)
{
	struct intel_digital_port *dport = enc_to_dig_port(&encoder->base);
	struct intel_hdmi *intel_hdmi = &dport->hdmi;
	struct drm_device *dev = encoder->base.dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_crtc *intel_crtc =
		to_intel_crtc(encoder->base.crtc);
	const struct drm_display_mode *adjusted_mode = &intel_crtc->config->base.adjusted_mode;
	enum dpio_channel port = vlv_dport_to_channel(dport);
	int pipe = intel_crtc->pipe;
	u32 val;

	/* Enable clock channels for this port */
	mutex_lock(&dev_priv->sb_lock);
	val = vlv_dpio_read(dev_priv, pipe, VLV_PCS01_DW8(port));
	val = 0;
	if (pipe)
		val |= (1<<21);
	else
		val &= ~(1<<21);
	val |= 0x001000c4;
	vlv_dpio_write(dev_priv, pipe, VLV_PCS_DW8(port), val);

	/* HDMI 1.0V-2dB */
	vlv_dpio_write(dev_priv, pipe, VLV_TX_DW5(port), 0);
	vlv_dpio_write(dev_priv, pipe, VLV_TX_DW4(port), 0x2b245f5f);
	vlv_dpio_write(dev_priv, pipe, VLV_TX_DW2(port), 0x5578b83a);
	vlv_dpio_write(dev_priv, pipe, VLV_TX_DW3(port), 0x0c782040);
	vlv_dpio_write(dev_priv, pipe, VLV_TX3_DW4(port), 0x2b247878);
	vlv_dpio_write(dev_priv, pipe, VLV_PCS_DW11(port), 0x00030000);
	vlv_dpio_write(dev_priv, pipe, VLV_PCS_DW9(port), 0x00002000);
	vlv_dpio_write(dev_priv, pipe, VLV_TX_DW5(port), DPIO_TX_OCALINIT_EN);

	/* Program lane clock */
	vlv_dpio_write(dev_priv, pipe, VLV_PCS_DW14(port), 0x00760018);
	vlv_dpio_write(dev_priv, pipe, VLV_PCS_DW23(port), 0x00400888);
	mutex_unlock(&dev_priv->sb_lock);

	intel_hdmi->set_infoframes(&encoder->base,
				   intel_crtc->config->has_hdmi_sink,
				   adjusted_mode);

	g4x_enable_hdmi(encoder);

	vlv_wait_port_ready(dev_priv, dport, 0x0);
}

static void vlv_hdmi_pre_pll_enable(struct intel_encoder *encoder)
{
	struct intel_digital_port *dport = enc_to_dig_port(&encoder->base);
	struct drm_device *dev = encoder->base.dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_crtc *intel_crtc =
		to_intel_crtc(encoder->base.crtc);
	enum dpio_channel port = vlv_dport_to_channel(dport);
	int pipe = intel_crtc->pipe;

	intel_hdmi_prepare(encoder);

	/* Program Tx lane resets to default */
	mutex_lock(&dev_priv->sb_lock);
	vlv_dpio_write(dev_priv, pipe, VLV_PCS_DW0(port),
			 DPIO_PCS_TX_LANE2_RESET |
			 DPIO_PCS_TX_LANE1_RESET);
	vlv_dpio_write(dev_priv, pipe, VLV_PCS_DW1(port),
			 DPIO_PCS_CLK_CRI_RXEB_EIOS_EN |
			 DPIO_PCS_CLK_CRI_RXDIGFILTSG_EN |
			 (1<<DPIO_PCS_CLK_DATAWIDTH_SHIFT) |
			 DPIO_PCS_CLK_SOFT_RESET);

	/* Fix up inter-pair skew failure */
	vlv_dpio_write(dev_priv, pipe, VLV_PCS_DW12(port), 0x00750f00);
	vlv_dpio_write(dev_priv, pipe, VLV_TX_DW11(port), 0x00001500);
	vlv_dpio_write(dev_priv, pipe, VLV_TX_DW14(port), 0x40400000);

	vlv_dpio_write(dev_priv, pipe, VLV_PCS_DW9(port), 0x00002000);
	vlv_dpio_write(dev_priv, pipe, VLV_TX_DW5(port), DPIO_TX_OCALINIT_EN);
	mutex_unlock(&dev_priv->sb_lock);
}

static void chv_data_lane_soft_reset(struct intel_encoder *encoder,
				     bool reset)
{
	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
	enum dpio_channel ch = vlv_dport_to_channel(enc_to_dig_port(&encoder->base));
	struct intel_crtc *crtc = to_intel_crtc(encoder->base.crtc);
	enum pipe pipe = crtc->pipe;
	uint32_t val;

	val = vlv_dpio_read(dev_priv, pipe, VLV_PCS01_DW0(ch));
	if (reset)
		val &= ~(DPIO_PCS_TX_LANE2_RESET | DPIO_PCS_TX_LANE1_RESET);
	else
		val |= DPIO_PCS_TX_LANE2_RESET | DPIO_PCS_TX_LANE1_RESET;
	vlv_dpio_write(dev_priv, pipe, VLV_PCS01_DW0(ch), val);

	if (crtc->config->lane_count > 2) {
		val = vlv_dpio_read(dev_priv, pipe, VLV_PCS23_DW0(ch));
		if (reset)
			val &= ~(DPIO_PCS_TX_LANE2_RESET | DPIO_PCS_TX_LANE1_RESET);
		else
			val |= DPIO_PCS_TX_LANE2_RESET | DPIO_PCS_TX_LANE1_RESET;
		vlv_dpio_write(dev_priv, pipe, VLV_PCS23_DW0(ch), val);
	}

	val = vlv_dpio_read(dev_priv, pipe, VLV_PCS01_DW1(ch));
	val |= CHV_PCS_REQ_SOFTRESET_EN;
	if (reset)
		val &= ~DPIO_PCS_CLK_SOFT_RESET;
	else
		val |= DPIO_PCS_CLK_SOFT_RESET;
	vlv_dpio_write(dev_priv, pipe, VLV_PCS01_DW1(ch), val);

	if (crtc->config->lane_count > 2) {
		val = vlv_dpio_read(dev_priv, pipe, VLV_PCS23_DW1(ch));
		val |= CHV_PCS_REQ_SOFTRESET_EN;
		if (reset)
			val &= ~DPIO_PCS_CLK_SOFT_RESET;
		else
			val |= DPIO_PCS_CLK_SOFT_RESET;
		vlv_dpio_write(dev_priv, pipe, VLV_PCS23_DW1(ch), val);
	}
}

static void chv_hdmi_pre_pll_enable(struct intel_encoder *encoder)
{
	struct intel_digital_port *dport = enc_to_dig_port(&encoder->base);
	struct drm_device *dev = encoder->base.dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_crtc *intel_crtc =
		to_intel_crtc(encoder->base.crtc);
	enum dpio_channel ch = vlv_dport_to_channel(dport);
	enum pipe pipe = intel_crtc->pipe;
	u32 val;

	intel_hdmi_prepare(encoder);

	/*
	 * Must trick the second common lane into life.
	 * Otherwise we can't even access the PLL.
	 */
	if (ch == DPIO_CH0 && pipe == PIPE_B)
		dport->release_cl2_override =
			!chv_phy_powergate_ch(dev_priv, DPIO_PHY0, DPIO_CH1, true);

	chv_phy_powergate_lanes(encoder, true, 0x0);

	mutex_lock(&dev_priv->sb_lock);

	/* Assert data lane reset */
	chv_data_lane_soft_reset(encoder, true);

	/* program left/right clock distribution */
	if (pipe != PIPE_B) {
		val = vlv_dpio_read(dev_priv, pipe, _CHV_CMN_DW5_CH0);
		val &= ~(CHV_BUFLEFTENA1_MASK | CHV_BUFRIGHTENA1_MASK);
		if (ch == DPIO_CH0)
			val |= CHV_BUFLEFTENA1_FORCE;
		if (ch == DPIO_CH1)
			val |= CHV_BUFRIGHTENA1_FORCE;
		vlv_dpio_write(dev_priv, pipe, _CHV_CMN_DW5_CH0, val);
	} else {
		val = vlv_dpio_read(dev_priv, pipe, _CHV_CMN_DW1_CH1);
		val &= ~(CHV_BUFLEFTENA2_MASK | CHV_BUFRIGHTENA2_MASK);
		if (ch == DPIO_CH0)
			val |= CHV_BUFLEFTENA2_FORCE;
		if (ch == DPIO_CH1)
			val |= CHV_BUFRIGHTENA2_FORCE;
		vlv_dpio_write(dev_priv, pipe, _CHV_CMN_DW1_CH1, val);
	}

	/* program clock channel usage */
	val = vlv_dpio_read(dev_priv, pipe, VLV_PCS01_DW8(ch));
	val |= CHV_PCS_USEDCLKCHANNEL_OVRRIDE;
	if (pipe != PIPE_B)
		val &= ~CHV_PCS_USEDCLKCHANNEL;
	else
		val |= CHV_PCS_USEDCLKCHANNEL;
	vlv_dpio_write(dev_priv, pipe, VLV_PCS01_DW8(ch), val);

	val = vlv_dpio_read(dev_priv, pipe, VLV_PCS23_DW8(ch));
	val |= CHV_PCS_USEDCLKCHANNEL_OVRRIDE;
	if (pipe != PIPE_B)
		val &= ~CHV_PCS_USEDCLKCHANNEL;
	else
		val |= CHV_PCS_USEDCLKCHANNEL;
	vlv_dpio_write(dev_priv, pipe, VLV_PCS23_DW8(ch), val);

	/*
	 * This a a bit weird since generally CL
	 * matches the pipe, but here we need to
	 * pick the CL based on the port.
	 */
	val = vlv_dpio_read(dev_priv, pipe, CHV_CMN_DW19(ch));
	if (pipe != PIPE_B)
		val &= ~CHV_CMN_USEDCLKCHANNEL;
	else
		val |= CHV_CMN_USEDCLKCHANNEL;
	vlv_dpio_write(dev_priv, pipe, CHV_CMN_DW19(ch), val);

	mutex_unlock(&dev_priv->sb_lock);
}

static void chv_hdmi_post_pll_disable(struct intel_encoder *encoder)
{
	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
	enum pipe pipe = to_intel_crtc(encoder->base.crtc)->pipe;
	u32 val;

	mutex_lock(&dev_priv->sb_lock);

	/* disable left/right clock distribution */
	if (pipe != PIPE_B) {
		val = vlv_dpio_read(dev_priv, pipe, _CHV_CMN_DW5_CH0);
		val &= ~(CHV_BUFLEFTENA1_MASK | CHV_BUFRIGHTENA1_MASK);
		vlv_dpio_write(dev_priv, pipe, _CHV_CMN_DW5_CH0, val);
	} else {
		val = vlv_dpio_read(dev_priv, pipe, _CHV_CMN_DW1_CH1);
		val &= ~(CHV_BUFLEFTENA2_MASK | CHV_BUFRIGHTENA2_MASK);
		vlv_dpio_write(dev_priv, pipe, _CHV_CMN_DW1_CH1, val);
	}

	mutex_unlock(&dev_priv->sb_lock);

	/*
	 * Leave the power down bit cleared for at least one
	 * lane so that chv_powergate_phy_ch() will power
	 * on something when the channel is otherwise unused.
	 * When the port is off and the override is removed
	 * the lanes power down anyway, so otherwise it doesn't
	 * really matter what the state of power down bits is
	 * after this.
	 */
	chv_phy_powergate_lanes(encoder, false, 0x0);
}

static void vlv_hdmi_post_disable(struct intel_encoder *encoder)
{
	struct intel_digital_port *dport = enc_to_dig_port(&encoder->base);
	struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;
	struct intel_crtc *intel_crtc =
		to_intel_crtc(encoder->base.crtc);
	enum dpio_channel port = vlv_dport_to_channel(dport);
	int pipe = intel_crtc->pipe;

	/* Reset lanes to avoid HDMI flicker (VLV w/a) */
	mutex_lock(&dev_priv->sb_lock);
	vlv_dpio_write(dev_priv, pipe, VLV_PCS_DW0(port), 0x00000000);
	vlv_dpio_write(dev_priv, pipe, VLV_PCS_DW1(port), 0x00e00060);
	mutex_unlock(&dev_priv->sb_lock);
}

static void chv_hdmi_post_disable(struct intel_encoder *encoder)
{
	struct drm_device *dev = encoder->base.dev;
	struct drm_i915_private *dev_priv = dev->dev_private;

	mutex_lock(&dev_priv->sb_lock);

	/* Assert data lane reset */
	chv_data_lane_soft_reset(encoder, true);

	mutex_unlock(&dev_priv->sb_lock);
}

static void chv_hdmi_pre_enable(struct intel_encoder *encoder)
{
	struct intel_digital_port *dport = enc_to_dig_port(&encoder->base);
	struct intel_hdmi *intel_hdmi = &dport->hdmi;
	struct drm_device *dev = encoder->base.dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_crtc *intel_crtc =
		to_intel_crtc(encoder->base.crtc);
	const struct drm_display_mode *adjusted_mode = &intel_crtc->config->base.adjusted_mode;
	enum dpio_channel ch = vlv_dport_to_channel(dport);
	int pipe = intel_crtc->pipe;
	int data, i, stagger;
	u32 val;

	mutex_lock(&dev_priv->sb_lock);

	/* allow hardware to manage TX FIFO reset source */
	val = vlv_dpio_read(dev_priv, pipe, VLV_PCS01_DW11(ch));
	val &= ~DPIO_LANEDESKEW_STRAP_OVRD;
	vlv_dpio_write(dev_priv, pipe, VLV_PCS01_DW11(ch), val);

	val = vlv_dpio_read(dev_priv, pipe, VLV_PCS23_DW11(ch));
	val &= ~DPIO_LANEDESKEW_STRAP_OVRD;
	vlv_dpio_write(dev_priv, pipe, VLV_PCS23_DW11(ch), val);

	/* Program Tx latency optimal setting */
	for (i = 0; i < 4; i++) {
		/* Set the upar bit */
		data = (i == 1) ? 0x0 : 0x1;
		vlv_dpio_write(dev_priv, pipe, CHV_TX_DW14(ch, i),
				data << DPIO_UPAR_SHIFT);
	}

	/* Data lane stagger programming */
	if (intel_crtc->config->port_clock > 270000)
		stagger = 0x18;
	else if (intel_crtc->config->port_clock > 135000)
		stagger = 0xd;
	else if (intel_crtc->config->port_clock > 67500)
		stagger = 0x7;
	else if (intel_crtc->config->port_clock > 33750)
		stagger = 0x4;
	else
		stagger = 0x2;

	val = vlv_dpio_read(dev_priv, pipe, VLV_PCS01_DW11(ch));
	val |= DPIO_TX2_STAGGER_MASK(0x1f);
	vlv_dpio_write(dev_priv, pipe, VLV_PCS01_DW11(ch), val);

	val = vlv_dpio_read(dev_priv, pipe, VLV_PCS23_DW11(ch));
	val |= DPIO_TX2_STAGGER_MASK(0x1f);
	vlv_dpio_write(dev_priv, pipe, VLV_PCS23_DW11(ch), val);

	vlv_dpio_write(dev_priv, pipe, VLV_PCS01_DW12(ch),
		       DPIO_LANESTAGGER_STRAP(stagger) |
		       DPIO_LANESTAGGER_STRAP_OVRD |
		       DPIO_TX1_STAGGER_MASK(0x1f) |
		       DPIO_TX1_STAGGER_MULT(6) |
		       DPIO_TX2_STAGGER_MULT(0));

	vlv_dpio_write(dev_priv, pipe, VLV_PCS23_DW12(ch),
		       DPIO_LANESTAGGER_STRAP(stagger) |
		       DPIO_LANESTAGGER_STRAP_OVRD |
		       DPIO_TX1_STAGGER_MASK(0x1f) |
		       DPIO_TX1_STAGGER_MULT(7) |
		       DPIO_TX2_STAGGER_MULT(5));

	/* Deassert data lane reset */
	chv_data_lane_soft_reset(encoder, false);

	/* Clear calc init */
	val = vlv_dpio_read(dev_priv, pipe, VLV_PCS01_DW10(ch));
	val &= ~(DPIO_PCS_SWING_CALC_TX0_TX2 | DPIO_PCS_SWING_CALC_TX1_TX3);
	val &= ~(DPIO_PCS_TX1DEEMP_MASK | DPIO_PCS_TX2DEEMP_MASK);
	val |= DPIO_PCS_TX1DEEMP_9P5 | DPIO_PCS_TX2DEEMP_9P5;
	vlv_dpio_write(dev_priv, pipe, VLV_PCS01_DW10(ch), val);

	val = vlv_dpio_read(dev_priv, pipe, VLV_PCS23_DW10(ch));
	val &= ~(DPIO_PCS_SWING_CALC_TX0_TX2 | DPIO_PCS_SWING_CALC_TX1_TX3);
	val &= ~(DPIO_PCS_TX1DEEMP_MASK | DPIO_PCS_TX2DEEMP_MASK);
	val |= DPIO_PCS_TX1DEEMP_9P5 | DPIO_PCS_TX2DEEMP_9P5;
	vlv_dpio_write(dev_priv, pipe, VLV_PCS23_DW10(ch), val);

	val = vlv_dpio_read(dev_priv, pipe, VLV_PCS01_DW9(ch));
	val &= ~(DPIO_PCS_TX1MARGIN_MASK | DPIO_PCS_TX2MARGIN_MASK);
	val |= DPIO_PCS_TX1MARGIN_000 | DPIO_PCS_TX2MARGIN_000;
	vlv_dpio_write(dev_priv, pipe, VLV_PCS01_DW9(ch), val);

	val = vlv_dpio_read(dev_priv, pipe, VLV_PCS23_DW9(ch));
	val &= ~(DPIO_PCS_TX1MARGIN_MASK | DPIO_PCS_TX2MARGIN_MASK);
	val |= DPIO_PCS_TX1MARGIN_000 | DPIO_PCS_TX2MARGIN_000;
	vlv_dpio_write(dev_priv, pipe, VLV_PCS23_DW9(ch), val);

	/* FIXME: Program the support xxx V-dB */
	/* Use 800mV-0dB */
	for (i = 0; i < 4; i++) {
		val = vlv_dpio_read(dev_priv, pipe, CHV_TX_DW4(ch, i));
		val &= ~DPIO_SWING_DEEMPH9P5_MASK;
		val |= 128 << DPIO_SWING_DEEMPH9P5_SHIFT;
		vlv_dpio_write(dev_priv, pipe, CHV_TX_DW4(ch, i), val);
	}

	for (i = 0; i < 4; i++) {
		val = vlv_dpio_read(dev_priv, pipe, CHV_TX_DW2(ch, i));

		val &= ~DPIO_SWING_MARGIN000_MASK;
		val |= 102 << DPIO_SWING_MARGIN000_SHIFT;

		/*
		 * Supposedly this value shouldn't matter when unique transition
		 * scale is disabled, but in fact it does matter. Let's just
		 * always program the same value and hope it's OK.
		 */
		val &= ~(0xff << DPIO_UNIQ_TRANS_SCALE_SHIFT);
		val |= 0x9a << DPIO_UNIQ_TRANS_SCALE_SHIFT;

		vlv_dpio_write(dev_priv, pipe, CHV_TX_DW2(ch, i), val);
	}

	/*
	 * The document said it needs to set bit 27 for ch0 and bit 26
	 * for ch1. Might be a typo in the doc.
	 * For now, for this unique transition scale selection, set bit
	 * 27 for ch0 and ch1.
	 */
	for (i = 0; i < 4; i++) {
		val = vlv_dpio_read(dev_priv, pipe, CHV_TX_DW3(ch, i));
		val &= ~DPIO_TX_UNIQ_TRANS_SCALE_EN;
		vlv_dpio_write(dev_priv, pipe, CHV_TX_DW3(ch, i), val);
	}

	/* Start swing calculation */
	val = vlv_dpio_read(dev_priv, pipe, VLV_PCS01_DW10(ch));
	val |= DPIO_PCS_SWING_CALC_TX0_TX2 | DPIO_PCS_SWING_CALC_TX1_TX3;
	vlv_dpio_write(dev_priv, pipe, VLV_PCS01_DW10(ch), val);

	val = vlv_dpio_read(dev_priv, pipe, VLV_PCS23_DW10(ch));
	val |= DPIO_PCS_SWING_CALC_TX0_TX2 | DPIO_PCS_SWING_CALC_TX1_TX3;
	vlv_dpio_write(dev_priv, pipe, VLV_PCS23_DW10(ch), val);

	mutex_unlock(&dev_priv->sb_lock);

	intel_hdmi->set_infoframes(&encoder->base,
				   intel_crtc->config->has_hdmi_sink,
				   adjusted_mode);

	g4x_enable_hdmi(encoder);

	vlv_wait_port_ready(dev_priv, dport, 0x0);

	/* Second common lane will stay alive on its own now */
	if (dport->release_cl2_override) {
		chv_phy_powergate_ch(dev_priv, DPIO_PHY0, DPIO_CH1, false);
		dport->release_cl2_override = false;
	}
}

static void intel_hdmi_destroy(struct drm_connector *connector)
{
	kfree(to_intel_connector(connector)->detect_edid);
	drm_connector_cleanup(connector);
	kfree(connector);
}

static const struct drm_connector_funcs intel_hdmi_connector_funcs = {
	.dpms = drm_atomic_helper_connector_dpms,
	.detect = intel_hdmi_detect,
	.force = intel_hdmi_force,
	.fill_modes = drm_helper_probe_single_connector_modes,
	.set_property = intel_hdmi_set_property,
	.atomic_get_property = intel_connector_atomic_get_property,
	.destroy = intel_hdmi_destroy,
	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
};

static const struct drm_connector_helper_funcs intel_hdmi_connector_helper_funcs = {
	.get_modes = intel_hdmi_get_modes,
	.mode_valid = intel_hdmi_mode_valid,
	.best_encoder = intel_best_encoder,
};

static const struct drm_encoder_funcs intel_hdmi_enc_funcs = {
	.destroy = intel_encoder_destroy,
};

static void
intel_hdmi_add_properties(struct intel_hdmi *intel_hdmi, struct drm_connector *connector)
{
	intel_attach_force_audio_property(connector);
	intel_attach_broadcast_rgb_property(connector);
	intel_hdmi->color_range_auto = true;
	intel_attach_aspect_ratio_property(connector);
	intel_hdmi->aspect_ratio = HDMI_PICTURE_ASPECT_NONE;
}

void intel_hdmi_init_connector(struct intel_digital_port *intel_dig_port,
			       struct intel_connector *intel_connector)
{
	struct drm_connector *connector = &intel_connector->base;
	struct intel_hdmi *intel_hdmi = &intel_dig_port->hdmi;
	struct intel_encoder *intel_encoder = &intel_dig_port->base;
	struct drm_device *dev = intel_encoder->base.dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	enum port port = intel_dig_port->port;
	uint8_t alternate_ddc_pin;

	drm_connector_init(dev, connector, &intel_hdmi_connector_funcs,
			   DRM_MODE_CONNECTOR_HDMIA);
	drm_connector_helper_add(connector, &intel_hdmi_connector_helper_funcs);

	connector->interlace_allowed = 1;
	connector->doublescan_allowed = 0;
	connector->stereo_allowed = 1;

	switch (port) {
	case PORT_B:
		if (IS_BROXTON(dev_priv))
			intel_hdmi->ddc_bus = GMBUS_PIN_1_BXT;
		else
			intel_hdmi->ddc_bus = GMBUS_PIN_DPB;
		/*
		 * On BXT A0/A1, sw needs to activate DDIA HPD logic and
		 * interrupts to check the external panel connection.
		 */
		if (IS_BROXTON(dev_priv) && (INTEL_REVID(dev) < BXT_REVID_B0))
			intel_encoder->hpd_pin = HPD_PORT_A;
		else
			intel_encoder->hpd_pin = HPD_PORT_B;
		break;
	case PORT_C:
		if (IS_BROXTON(dev_priv))
			intel_hdmi->ddc_bus = GMBUS_PIN_2_BXT;
		else
			intel_hdmi->ddc_bus = GMBUS_PIN_DPC;
		intel_encoder->hpd_pin = HPD_PORT_C;
		break;
	case PORT_D:
		if (WARN_ON(IS_BROXTON(dev_priv)))
			intel_hdmi->ddc_bus = GMBUS_PIN_DISABLED;
		else if (IS_CHERRYVIEW(dev_priv))
			intel_hdmi->ddc_bus = GMBUS_PIN_DPD_CHV;
		else
			intel_hdmi->ddc_bus = GMBUS_PIN_DPD;
		intel_encoder->hpd_pin = HPD_PORT_D;
		break;
	case PORT_E:
		/* On SKL PORT E doesn't have seperate GMBUS pin
		 *  We rely on VBT to set a proper alternate GMBUS pin. */
		alternate_ddc_pin =
			dev_priv->vbt.ddi_port_info[PORT_E].alternate_ddc_pin;
		switch (alternate_ddc_pin) {
		case DDC_PIN_B:
			intel_hdmi->ddc_bus = GMBUS_PIN_DPB;
			break;
		case DDC_PIN_C:
			intel_hdmi->ddc_bus = GMBUS_PIN_DPC;
			break;
		case DDC_PIN_D:
			intel_hdmi->ddc_bus = GMBUS_PIN_DPD;
			break;
		default:
			MISSING_CASE(alternate_ddc_pin);
		}
		intel_encoder->hpd_pin = HPD_PORT_E;
		break;
	case PORT_A:
		intel_encoder->hpd_pin = HPD_PORT_A;
		/* Internal port only for eDP. */
	default:
		BUG();
	}

	if (IS_VALLEYVIEW(dev)) {
		intel_hdmi->write_infoframe = vlv_write_infoframe;
		intel_hdmi->set_infoframes = vlv_set_infoframes;
		intel_hdmi->infoframe_enabled = vlv_infoframe_enabled;
	} else if (IS_G4X(dev)) {
		intel_hdmi->write_infoframe = g4x_write_infoframe;
		intel_hdmi->set_infoframes = g4x_set_infoframes;
		intel_hdmi->infoframe_enabled = g4x_infoframe_enabled;
	} else if (HAS_DDI(dev)) {
		intel_hdmi->write_infoframe = hsw_write_infoframe;
		intel_hdmi->set_infoframes = hsw_set_infoframes;
		intel_hdmi->infoframe_enabled = hsw_infoframe_enabled;
	} else if (HAS_PCH_IBX(dev)) {
		intel_hdmi->write_infoframe = ibx_write_infoframe;
		intel_hdmi->set_infoframes = ibx_set_infoframes;
		intel_hdmi->infoframe_enabled = ibx_infoframe_enabled;
	} else {
		intel_hdmi->write_infoframe = cpt_write_infoframe;
		intel_hdmi->set_infoframes = cpt_set_infoframes;
		intel_hdmi->infoframe_enabled = cpt_infoframe_enabled;
	}

	if (HAS_DDI(dev))
		intel_connector->get_hw_state = intel_ddi_connector_get_hw_state;
	else
		intel_connector->get_hw_state = intel_connector_get_hw_state;
	intel_connector->unregister = intel_connector_unregister;

	intel_hdmi_add_properties(intel_hdmi, connector);

	intel_connector_attach_encoder(intel_connector, intel_encoder);
	drm_connector_register(connector);
	intel_hdmi->attached_connector = intel_connector;

	/* For G4X desktop chip, PEG_BAND_GAP_DATA 3:0 must first be written
	 * 0xd.  Failure to do so will result in spurious interrupts being
	 * generated on the port when a cable is not attached.
	 */
	if (IS_G4X(dev) && !IS_GM45(dev)) {
		u32 temp = I915_READ(PEG_BAND_GAP_DATA);
		I915_WRITE(PEG_BAND_GAP_DATA, (temp & ~0xf) | 0xd);
	}
}

void intel_hdmi_init(struct drm_device *dev, int hdmi_reg, enum port port)
{
	struct intel_digital_port *intel_dig_port;
	struct intel_encoder *intel_encoder;
	struct intel_connector *intel_connector;

	intel_dig_port = kzalloc(sizeof(*intel_dig_port), GFP_KERNEL);
	if (!intel_dig_port)
		return;

	intel_connector = intel_connector_alloc();
	if (!intel_connector) {
		kfree(intel_dig_port);
		return;
	}

	intel_encoder = &intel_dig_port->base;

	drm_encoder_init(dev, &intel_encoder->base, &intel_hdmi_enc_funcs,
			 DRM_MODE_ENCODER_TMDS);

	intel_encoder->compute_config = intel_hdmi_compute_config;
	if (HAS_PCH_SPLIT(dev)) {
		intel_encoder->disable = pch_disable_hdmi;
		intel_encoder->post_disable = pch_post_disable_hdmi;
	} else {
		intel_encoder->disable = g4x_disable_hdmi;
	}
	intel_encoder->get_hw_state = intel_hdmi_get_hw_state;
	intel_encoder->get_config = intel_hdmi_get_config;
	if (IS_CHERRYVIEW(dev)) {
		intel_encoder->pre_pll_enable = chv_hdmi_pre_pll_enable;
		intel_encoder->pre_enable = chv_hdmi_pre_enable;
		intel_encoder->enable = vlv_enable_hdmi;
		intel_encoder->post_disable = chv_hdmi_post_disable;
		intel_encoder->post_pll_disable = chv_hdmi_post_pll_disable;
	} else if (IS_VALLEYVIEW(dev)) {
		intel_encoder->pre_pll_enable = vlv_hdmi_pre_pll_enable;
		intel_encoder->pre_enable = vlv_hdmi_pre_enable;
		intel_encoder->enable = vlv_enable_hdmi;
		intel_encoder->post_disable = vlv_hdmi_post_disable;
	} else {
		intel_encoder->pre_enable = intel_hdmi_pre_enable;
		if (HAS_PCH_CPT(dev))
			intel_encoder->enable = cpt_enable_hdmi;
		else if (HAS_PCH_IBX(dev))
			intel_encoder->enable = ibx_enable_hdmi;
		else
			intel_encoder->enable = g4x_enable_hdmi;
	}

	intel_encoder->type = INTEL_OUTPUT_HDMI;
	if (IS_CHERRYVIEW(dev)) {
		if (port == PORT_D)
			intel_encoder->crtc_mask = 1 << 2;
		else
			intel_encoder->crtc_mask = (1 << 0) | (1 << 1);
	} else {
		intel_encoder->crtc_mask = (1 << 0) | (1 << 1) | (1 << 2);
	}
	intel_encoder->cloneable = 1 << INTEL_OUTPUT_ANALOG;
	/*
	 * BSpec is unclear about HDMI+HDMI cloning on g4x, but it seems
	 * to work on real hardware. And since g4x can send infoframes to
	 * only one port anyway, nothing is lost by allowing it.
	 */
	if (IS_G4X(dev))
		intel_encoder->cloneable |= 1 << INTEL_OUTPUT_HDMI;

	intel_dig_port->port = port;
	intel_dig_port->hdmi.hdmi_reg = hdmi_reg;
	intel_dig_port->dp.output_reg = 0;

	intel_hdmi_init_connector(intel_dig_port, intel_connector);
}