drivers/gpu/drm/i915/intel_crt.c - kernel/msm-4.19 - Gitiles

 /*
  * 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/i2c.h>
 #include "drmP.h"
 #include "drm.h"
 #include "drm_crtc.h"
 #include "drm_crtc_helper.h"
 #include "intel_drv.h"
 #include "i915_drm.h"
 #include "i915_drv.h"

 static void intel_crt_dpms(struct drm_encoder *encoder, int mode)
 {
 	struct drm_device *dev = encoder->dev;
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	u32 temp, reg;

 	if (IS_IRONLAKE(dev))
 		reg = PCH_ADPA;
 	else
 		reg = ADPA;

 	temp = I915_READ(reg);
 	temp &= ~(ADPA_HSYNC_CNTL_DISABLE | ADPA_VSYNC_CNTL_DISABLE);
 	temp &= ~ADPA_DAC_ENABLE;

 	switch(mode) {
 	case DRM_MODE_DPMS_ON:
 		temp |= ADPA_DAC_ENABLE;
 		break;
 	case DRM_MODE_DPMS_STANDBY:
 		temp |= ADPA_DAC_ENABLE | ADPA_HSYNC_CNTL_DISABLE;
 		break;
 	case DRM_MODE_DPMS_SUSPEND:
 		temp |= ADPA_DAC_ENABLE | ADPA_VSYNC_CNTL_DISABLE;
 		break;
 	case DRM_MODE_DPMS_OFF:
 		temp |= ADPA_HSYNC_CNTL_DISABLE | ADPA_VSYNC_CNTL_DISABLE;
 		break;
 	}

 	I915_WRITE(reg, temp);
 }

 static int intel_crt_mode_valid(struct drm_connector *connector,
 				struct drm_display_mode *mode)
 {
 	struct drm_device *dev = connector->dev;

 	int max_clock = 0;
 	if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
 		return MODE_NO_DBLESCAN;

 	if (mode->clock < 25000)
 		return MODE_CLOCK_LOW;

 	if (!IS_I9XX(dev))
 		max_clock = 350000;
 	else
 		max_clock = 400000;
 	if (mode->clock > max_clock)
 		return MODE_CLOCK_HIGH;

 	return MODE_OK;
 }

 static bool intel_crt_mode_fixup(struct drm_encoder *encoder,
 				 struct drm_display_mode *mode,
 				 struct drm_display_mode *adjusted_mode)
 {
 	return true;
 }

 static void intel_crt_mode_set(struct drm_encoder *encoder,
 			       struct drm_display_mode *mode,
 			       struct drm_display_mode *adjusted_mode)
 {

 	struct drm_device *dev = encoder->dev;
 	struct drm_crtc *crtc = encoder->crtc;
 	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	int dpll_md_reg;
 	u32 adpa, dpll_md;
 	u32 adpa_reg;

 	if (intel_crtc->pipe == 0)
 		dpll_md_reg = DPLL_A_MD;
 	else
 		dpll_md_reg = DPLL_B_MD;

 	if (IS_IRONLAKE(dev))
 		adpa_reg = PCH_ADPA;
 	else
 		adpa_reg = ADPA;

 	/*
 	 * Disable separate mode multiplier used when cloning SDVO to CRT
 	 * XXX this needs to be adjusted when we really are cloning
 	 */
 	if (IS_I965G(dev) && !IS_IRONLAKE(dev)) {
 		dpll_md = I915_READ(dpll_md_reg);
 		I915_WRITE(dpll_md_reg,
 			   dpll_md & ~DPLL_MD_UDI_MULTIPLIER_MASK);
 	}

 	adpa = 0;
 	if (adjusted_mode->flags & DRM_MODE_FLAG_PHSYNC)
 		adpa |= ADPA_HSYNC_ACTIVE_HIGH;
 	if (adjusted_mode->flags & DRM_MODE_FLAG_PVSYNC)
 		adpa |= ADPA_VSYNC_ACTIVE_HIGH;

 	if (intel_crtc->pipe == 0) {
 		adpa |= ADPA_PIPE_A_SELECT;
 		if (!IS_IRONLAKE(dev))
 			I915_WRITE(BCLRPAT_A, 0);
 	} else {
 		adpa |= ADPA_PIPE_B_SELECT;
 		if (!IS_IRONLAKE(dev))
 			I915_WRITE(BCLRPAT_B, 0);
 	}

 	I915_WRITE(adpa_reg, adpa);
 }

 static bool intel_ironlake_crt_detect_hotplug(struct drm_connector *connector)
 {
 	struct drm_device *dev = connector->dev;
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	u32 adpa;
 	bool ret;

 	adpa = I915_READ(PCH_ADPA);

 	adpa &= ~ADPA_CRT_HOTPLUG_MASK;

 	adpa |= (ADPA_CRT_HOTPLUG_PERIOD_128 |
 			ADPA_CRT_HOTPLUG_WARMUP_10MS |
 			ADPA_CRT_HOTPLUG_SAMPLE_4S |
 			ADPA_CRT_HOTPLUG_VOLTAGE_50 | /* default */
 			ADPA_CRT_HOTPLUG_VOLREF_325MV |
 			ADPA_CRT_HOTPLUG_ENABLE |
 			ADPA_CRT_HOTPLUG_FORCE_TRIGGER);

 	DRM_DEBUG_KMS("pch crt adpa 0x%x", adpa);
 	I915_WRITE(PCH_ADPA, adpa);

 	while ((I915_READ(PCH_ADPA) & ADPA_CRT_HOTPLUG_FORCE_TRIGGER) != 0)
 		;

 	/* Check the status to see if both blue and green are on now */
 	adpa = I915_READ(PCH_ADPA);
 	adpa &= ADPA_CRT_HOTPLUG_MONITOR_MASK;
 	if ((adpa == ADPA_CRT_HOTPLUG_MONITOR_COLOR) ||
 		(adpa == ADPA_CRT_HOTPLUG_MONITOR_MONO))
 		ret = true;
 	else
 		ret = false;

 	return ret;
 }

 /**
  * Uses CRT_HOTPLUG_EN and CRT_HOTPLUG_STAT to detect CRT presence.
  *
  * Not for i915G/i915GM
  *
  * \return true if CRT is connected.
  * \return false if CRT is disconnected.
  */
 static bool intel_crt_detect_hotplug(struct drm_connector *connector)
 {
 	struct drm_device *dev = connector->dev;
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	u32 hotplug_en;
 	int i, tries = 0;

 	if (IS_IRONLAKE(dev))
 		return intel_ironlake_crt_detect_hotplug(connector);

 	/*
 	 * On 4 series desktop, CRT detect sequence need to be done twice
 	 * to get a reliable result.
 	 */

 	if (IS_G4X(dev) && !IS_GM45(dev))
 		tries = 2;
 	else
 		tries = 1;
 	hotplug_en = I915_READ(PORT_HOTPLUG_EN);
 	hotplug_en &= CRT_FORCE_HOTPLUG_MASK;
 	hotplug_en |= CRT_HOTPLUG_FORCE_DETECT;

 	if (IS_G4X(dev))
 		hotplug_en |= CRT_HOTPLUG_ACTIVATION_PERIOD_64;

 	hotplug_en |= CRT_HOTPLUG_VOLTAGE_COMPARE_50;

 	for (i = 0; i < tries ; i++) {
 		unsigned long timeout;
 		/* turn on the FORCE_DETECT */
 		I915_WRITE(PORT_HOTPLUG_EN, hotplug_en);
 		timeout = jiffies + msecs_to_jiffies(1000);
 		/* wait for FORCE_DETECT to go off */
 		do {
 			if (!(I915_READ(PORT_HOTPLUG_EN) &
 					CRT_HOTPLUG_FORCE_DETECT))
 				break;
 			msleep(1);
 		} while (time_after(timeout, jiffies));
 	}

 	if ((I915_READ(PORT_HOTPLUG_STAT) & CRT_HOTPLUG_MONITOR_MASK) !=
 	    CRT_HOTPLUG_MONITOR_NONE)
 		return true;

 	return false;
 }

 static bool intel_crt_detect_ddc(struct drm_connector *connector)
 {
 	struct intel_output *intel_output = to_intel_output(connector);

 	/* CRT should always be at 0, but check anyway */
 	if (intel_output->type != INTEL_OUTPUT_ANALOG)
 		return false;

 	return intel_ddc_probe(intel_output);
 }

 static enum drm_connector_status
 intel_crt_load_detect(struct drm_crtc *crtc, struct intel_output *intel_output)
 {
 	struct drm_encoder *encoder = &intel_output->enc;
 	struct drm_device *dev = encoder->dev;
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 	uint32_t pipe = intel_crtc->pipe;
 	uint32_t save_bclrpat;
 	uint32_t save_vtotal;
 	uint32_t vtotal, vactive;
 	uint32_t vsample;
 	uint32_t vblank, vblank_start, vblank_end;
 	uint32_t dsl;
 	uint32_t bclrpat_reg;
 	uint32_t vtotal_reg;
 	uint32_t vblank_reg;
 	uint32_t vsync_reg;
 	uint32_t pipeconf_reg;
 	uint32_t pipe_dsl_reg;
 	uint8_t	st00;
 	enum drm_connector_status status;

 	if (pipe == 0) {
 		bclrpat_reg = BCLRPAT_A;
 		vtotal_reg = VTOTAL_A;
 		vblank_reg = VBLANK_A;
 		vsync_reg = VSYNC_A;
 		pipeconf_reg = PIPEACONF;
 		pipe_dsl_reg = PIPEADSL;
 	} else {
 		bclrpat_reg = BCLRPAT_B;
 		vtotal_reg = VTOTAL_B;
 		vblank_reg = VBLANK_B;
 		vsync_reg = VSYNC_B;
 		pipeconf_reg = PIPEBCONF;
 		pipe_dsl_reg = PIPEBDSL;
 	}

 	save_bclrpat = I915_READ(bclrpat_reg);
 	save_vtotal = I915_READ(vtotal_reg);
 	vblank = I915_READ(vblank_reg);

 	vtotal = ((save_vtotal >> 16) & 0xfff) + 1;
 	vactive = (save_vtotal & 0x7ff) + 1;

 	vblank_start = (vblank & 0xfff) + 1;
 	vblank_end = ((vblank >> 16) & 0xfff) + 1;

 	/* Set the border color to purple. */
 	I915_WRITE(bclrpat_reg, 0x500050);

 	if (IS_I9XX(dev)) {
 		uint32_t pipeconf = I915_READ(pipeconf_reg);
 		I915_WRITE(pipeconf_reg, pipeconf | PIPECONF_FORCE_BORDER);
 		/* Wait for next Vblank to substitue
 		 * border color for Color info */
 		intel_wait_for_vblank(dev);
 		st00 = I915_READ8(VGA_MSR_WRITE);
 		status = ((st00 & (1 << 4)) != 0) ?
 			connector_status_connected :
 			connector_status_disconnected;

 		I915_WRITE(pipeconf_reg, pipeconf);
 	} else {
 		bool restore_vblank = false;
 		int count, detect;

 		/*
 		* If there isn't any border, add some.
 		* Yes, this will flicker
 		*/
 		if (vblank_start <= vactive && vblank_end >= vtotal) {
 			uint32_t vsync = I915_READ(vsync_reg);
 			uint32_t vsync_start = (vsync & 0xffff) + 1;

 			vblank_start = vsync_start;
 			I915_WRITE(vblank_reg,
 				   (vblank_start - 1) |
 				   ((vblank_end - 1) << 16));
 			restore_vblank = true;
 		}
 		/* sample in the vertical border, selecting the larger one */
 		if (vblank_start - vactive >= vtotal - vblank_end)
 			vsample = (vblank_start + vactive) >> 1;
 		else
 			vsample = (vtotal + vblank_end) >> 1;

 		/*
 		 * Wait for the border to be displayed
 		 */
 		while (I915_READ(pipe_dsl_reg) >= vactive)
 			;
 		while ((dsl = I915_READ(pipe_dsl_reg)) <= vsample)
 			;
 		/*
 		 * Watch ST00 for an entire scanline
 		 */
 		detect = 0;
 		count = 0;
 		do {
 			count++;
 			/* Read the ST00 VGA status register */
 			st00 = I915_READ8(VGA_MSR_WRITE);
 			if (st00 & (1 << 4))
 				detect++;
 		} while ((I915_READ(pipe_dsl_reg) == dsl));

 		/* restore vblank if necessary */
 		if (restore_vblank)
 			I915_WRITE(vblank_reg, vblank);
 		/*
 		 * If more than 3/4 of the scanline detected a monitor,
 		 * then it is assumed to be present. This works even on i830,
 		 * where there isn't any way to force the border color across
 		 * the screen
 		 */
 		status = detect * 4 > count * 3 ?
 			 connector_status_connected :
 			 connector_status_disconnected;
 	}

 	/* Restore previous settings */
 	I915_WRITE(bclrpat_reg, save_bclrpat);

 	return status;
 }

 static enum drm_connector_status intel_crt_detect(struct drm_connector *connector)
 {
 	struct drm_device *dev = connector->dev;
 	struct intel_output *intel_output = to_intel_output(connector);
 	struct drm_encoder *encoder = &intel_output->enc;
 	struct drm_crtc *crtc;
 	int dpms_mode;
 	enum drm_connector_status status;

 	if (IS_I9XX(dev) && !IS_I915G(dev) && !IS_I915GM(dev)) {
 		if (intel_crt_detect_hotplug(connector))
 			return connector_status_connected;
 		else
 			return connector_status_disconnected;
 	}

 	if (intel_crt_detect_ddc(connector))
 		return connector_status_connected;

 	/* for pre-945g platforms use load detect */
 	if (encoder->crtc && encoder->crtc->enabled) {
 		status = intel_crt_load_detect(encoder->crtc, intel_output);
 	} else {
 		crtc = intel_get_load_detect_pipe(intel_output,
 						  NULL, &dpms_mode);
 		if (crtc) {
 			status = intel_crt_load_detect(crtc, intel_output);
 			intel_release_load_detect_pipe(intel_output, dpms_mode);
 		} else
 			status = connector_status_unknown;
 	}

 	return status;
 }

 static void intel_crt_destroy(struct drm_connector *connector)
 {
 	struct intel_output *intel_output = to_intel_output(connector);

 	intel_i2c_destroy(intel_output->ddc_bus);
 	drm_sysfs_connector_remove(connector);
 	drm_connector_cleanup(connector);
 	kfree(connector);
 }

 static int intel_crt_get_modes(struct drm_connector *connector)
 {
 	int ret;
 	struct intel_output *intel_output = to_intel_output(connector);
 	struct i2c_adapter *ddcbus;
 	struct drm_device *dev = connector->dev;


 	ret = intel_ddc_get_modes(intel_output);
 	if (ret || !IS_G4X(dev))
 		goto end;

 	ddcbus = intel_output->ddc_bus;
 	/* Try to probe digital port for output in DVI-I -> VGA mode. */
 	intel_output->ddc_bus =
 		intel_i2c_create(connector->dev, GPIOD, "CRTDDC_D");

 	if (!intel_output->ddc_bus) {
 		intel_output->ddc_bus = ddcbus;
 		dev_printk(KERN_ERR, &connector->dev->pdev->dev,
 			   "DDC bus registration failed for CRTDDC_D.\n");
 		goto end;
 	}
 	/* Try to get modes by GPIOD port */
 	ret = intel_ddc_get_modes(intel_output);
 	intel_i2c_destroy(ddcbus);

 end:
 	return ret;

 }

 static int intel_crt_set_property(struct drm_connector *connector,
 				  struct drm_property *property,
 				  uint64_t value)
 {
 	return 0;
 }

 /*
  * Routines for controlling stuff on the analog port
  */

 static const struct drm_encoder_helper_funcs intel_crt_helper_funcs = {
 	.dpms = intel_crt_dpms,
 	.mode_fixup = intel_crt_mode_fixup,
 	.prepare = intel_encoder_prepare,
 	.commit = intel_encoder_commit,
 	.mode_set = intel_crt_mode_set,
 };

 static const struct drm_connector_funcs intel_crt_connector_funcs = {
 	.dpms = drm_helper_connector_dpms,
 	.detect = intel_crt_detect,
 	.fill_modes = drm_helper_probe_single_connector_modes,
 	.destroy = intel_crt_destroy,
 	.set_property = intel_crt_set_property,
 };

 static const struct drm_connector_helper_funcs intel_crt_connector_helper_funcs = {
 	.mode_valid = intel_crt_mode_valid,
 	.get_modes = intel_crt_get_modes,
 	.best_encoder = intel_best_encoder,
 };

 static void intel_crt_enc_destroy(struct drm_encoder *encoder)
 {
 	drm_encoder_cleanup(encoder);
 }

 static const struct drm_encoder_funcs intel_crt_enc_funcs = {
 	.destroy = intel_crt_enc_destroy,
 };

 void intel_crt_init(struct drm_device *dev)
 {
 	struct drm_connector *connector;
 	struct intel_output *intel_output;
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	u32 i2c_reg;

 	intel_output = kzalloc(sizeof(struct intel_output), GFP_KERNEL);
 	if (!intel_output)
 		return;

 	connector = &intel_output->base;
 	drm_connector_init(dev, &intel_output->base,
 			   &intel_crt_connector_funcs, DRM_MODE_CONNECTOR_VGA);

 	drm_encoder_init(dev, &intel_output->enc, &intel_crt_enc_funcs,
 			 DRM_MODE_ENCODER_DAC);

 	drm_mode_connector_attach_encoder(&intel_output->base,
 					  &intel_output->enc);

 	/* Set up the DDC bus. */
 	if (IS_IRONLAKE(dev))
 		i2c_reg = PCH_GPIOA;
 	else {
 		i2c_reg = GPIOA;
 		/* Use VBT information for CRT DDC if available */
 		if (dev_priv->crt_ddc_bus != 0)
 			i2c_reg = dev_priv->crt_ddc_bus;
 	}
 	intel_output->ddc_bus = intel_i2c_create(dev, i2c_reg, "CRTDDC_A");
 	if (!intel_output->ddc_bus) {
 		dev_printk(KERN_ERR, &dev->pdev->dev, "DDC bus registration "
 			   "failed.\n");
 		return;
 	}

 	intel_output->type = INTEL_OUTPUT_ANALOG;
 	intel_output->clone_mask = (1 << INTEL_SDVO_NON_TV_CLONE_BIT) |
 				   (1 << INTEL_ANALOG_CLONE_BIT) |
 				   (1 << INTEL_SDVO_LVDS_CLONE_BIT);
 	intel_output->crtc_mask = (1 << 0) | (1 << 1);
 	connector->interlace_allowed = 0;
 	connector->doublescan_allowed = 0;

 	drm_encoder_helper_add(&intel_output->enc, &intel_crt_helper_funcs);
 	drm_connector_helper_add(connector, &intel_crt_connector_helper_funcs);

 	drm_sysfs_connector_add(connector);
 }
	/*
	* 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/i2c.h>
	#include "drmP.h"
	#include "drm.h"
	#include "drm_crtc.h"
	#include "drm_crtc_helper.h"
	#include "intel_drv.h"
	#include "i915_drm.h"
	#include "i915_drv.h"

	static void intel_crt_dpms(struct drm_encoder *encoder, int mode)
	{
	struct drm_device *dev = encoder->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	u32 temp, reg;

	if (IS_IRONLAKE(dev))
	reg = PCH_ADPA;
	else
	reg = ADPA;

	temp = I915_READ(reg);
	temp &= ~(ADPA_HSYNC_CNTL_DISABLE \| ADPA_VSYNC_CNTL_DISABLE);
	temp &= ~ADPA_DAC_ENABLE;

	switch(mode) {
	case DRM_MODE_DPMS_ON:
	temp \|= ADPA_DAC_ENABLE;
	break;
	case DRM_MODE_DPMS_STANDBY:
	temp \|= ADPA_DAC_ENABLE \| ADPA_HSYNC_CNTL_DISABLE;
	break;
	case DRM_MODE_DPMS_SUSPEND:
	temp \|= ADPA_DAC_ENABLE \| ADPA_VSYNC_CNTL_DISABLE;
	break;
	case DRM_MODE_DPMS_OFF:
	temp \|= ADPA_HSYNC_CNTL_DISABLE \| ADPA_VSYNC_CNTL_DISABLE;
	break;
	}

	I915_WRITE(reg, temp);
	}

	static int intel_crt_mode_valid(struct drm_connector *connector,
	struct drm_display_mode *mode)
	{
	struct drm_device *dev = connector->dev;

	int max_clock = 0;
	if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
	return MODE_NO_DBLESCAN;

	if (mode->clock < 25000)
	return MODE_CLOCK_LOW;

	if (!IS_I9XX(dev))
	max_clock = 350000;
	else
	max_clock = 400000;
	if (mode->clock > max_clock)
	return MODE_CLOCK_HIGH;

	return MODE_OK;
	}

	static bool intel_crt_mode_fixup(struct drm_encoder *encoder,
	struct drm_display_mode *mode,
	struct drm_display_mode *adjusted_mode)
	{
	return true;
	}

	static void intel_crt_mode_set(struct drm_encoder *encoder,
	struct drm_display_mode *mode,
	struct drm_display_mode *adjusted_mode)
	{

	struct drm_device *dev = encoder->dev;
	struct drm_crtc *crtc = encoder->crtc;
	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
	struct drm_i915_private *dev_priv = dev->dev_private;
	int dpll_md_reg;
	u32 adpa, dpll_md;
	u32 adpa_reg;

	if (intel_crtc->pipe == 0)
	dpll_md_reg = DPLL_A_MD;
	else
	dpll_md_reg = DPLL_B_MD;

	if (IS_IRONLAKE(dev))
	adpa_reg = PCH_ADPA;
	else
	adpa_reg = ADPA;

	/*
	* Disable separate mode multiplier used when cloning SDVO to CRT
	* XXX this needs to be adjusted when we really are cloning
	*/
	if (IS_I965G(dev) && !IS_IRONLAKE(dev)) {
	dpll_md = I915_READ(dpll_md_reg);
	I915_WRITE(dpll_md_reg,
	dpll_md & ~DPLL_MD_UDI_MULTIPLIER_MASK);
	}

	adpa = 0;
	if (adjusted_mode->flags & DRM_MODE_FLAG_PHSYNC)
	adpa \|= ADPA_HSYNC_ACTIVE_HIGH;
	if (adjusted_mode->flags & DRM_MODE_FLAG_PVSYNC)
	adpa \|= ADPA_VSYNC_ACTIVE_HIGH;

	if (intel_crtc->pipe == 0) {
	adpa \|= ADPA_PIPE_A_SELECT;
	if (!IS_IRONLAKE(dev))
	I915_WRITE(BCLRPAT_A, 0);
	} else {
	adpa \|= ADPA_PIPE_B_SELECT;
	if (!IS_IRONLAKE(dev))
	I915_WRITE(BCLRPAT_B, 0);
	}

	I915_WRITE(adpa_reg, adpa);
	}

	static bool intel_ironlake_crt_detect_hotplug(struct drm_connector *connector)
	{
	struct drm_device *dev = connector->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	u32 adpa;
	bool ret;

	adpa = I915_READ(PCH_ADPA);

	adpa &= ~ADPA_CRT_HOTPLUG_MASK;

	adpa \|= (ADPA_CRT_HOTPLUG_PERIOD_128 \|
	ADPA_CRT_HOTPLUG_WARMUP_10MS \|
	ADPA_CRT_HOTPLUG_SAMPLE_4S \|
	ADPA_CRT_HOTPLUG_VOLTAGE_50 \| /* default */
	ADPA_CRT_HOTPLUG_VOLREF_325MV \|
	ADPA_CRT_HOTPLUG_ENABLE \|
	ADPA_CRT_HOTPLUG_FORCE_TRIGGER);

	DRM_DEBUG_KMS("pch crt adpa 0x%x", adpa);
	I915_WRITE(PCH_ADPA, adpa);

	while ((I915_READ(PCH_ADPA) & ADPA_CRT_HOTPLUG_FORCE_TRIGGER) != 0)
	;

	/* Check the status to see if both blue and green are on now */
	adpa = I915_READ(PCH_ADPA);
	adpa &= ADPA_CRT_HOTPLUG_MONITOR_MASK;
	if ((adpa == ADPA_CRT_HOTPLUG_MONITOR_COLOR) \|\|
	(adpa == ADPA_CRT_HOTPLUG_MONITOR_MONO))
	ret = true;
	else
	ret = false;

	return ret;
	}

	/**
	* Uses CRT_HOTPLUG_EN and CRT_HOTPLUG_STAT to detect CRT presence.
	*
	* Not for i915G/i915GM
	*
	* \return true if CRT is connected.
	* \return false if CRT is disconnected.
	*/
	static bool intel_crt_detect_hotplug(struct drm_connector *connector)
	{
	struct drm_device *dev = connector->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	u32 hotplug_en;
	int i, tries = 0;

	if (IS_IRONLAKE(dev))
	return intel_ironlake_crt_detect_hotplug(connector);

	/*
	* On 4 series desktop, CRT detect sequence need to be done twice
	* to get a reliable result.
	*/

	if (IS_G4X(dev) && !IS_GM45(dev))
	tries = 2;
	else
	tries = 1;
	hotplug_en = I915_READ(PORT_HOTPLUG_EN);
	hotplug_en &= CRT_FORCE_HOTPLUG_MASK;
	hotplug_en \|= CRT_HOTPLUG_FORCE_DETECT;

	if (IS_G4X(dev))
	hotplug_en \|= CRT_HOTPLUG_ACTIVATION_PERIOD_64;

	hotplug_en \|= CRT_HOTPLUG_VOLTAGE_COMPARE_50;

	for (i = 0; i < tries ; i++) {
	unsigned long timeout;
	/* turn on the FORCE_DETECT */
	I915_WRITE(PORT_HOTPLUG_EN, hotplug_en);
	timeout = jiffies + msecs_to_jiffies(1000);
	/* wait for FORCE_DETECT to go off */
	do {
	if (!(I915_READ(PORT_HOTPLUG_EN) &
	CRT_HOTPLUG_FORCE_DETECT))
	break;
	msleep(1);
	} while (time_after(timeout, jiffies));
	}

	if ((I915_READ(PORT_HOTPLUG_STAT) & CRT_HOTPLUG_MONITOR_MASK) !=
	CRT_HOTPLUG_MONITOR_NONE)
	return true;

	return false;
	}

	static bool intel_crt_detect_ddc(struct drm_connector *connector)
	{
	struct intel_output *intel_output = to_intel_output(connector);

	/* CRT should always be at 0, but check anyway */
	if (intel_output->type != INTEL_OUTPUT_ANALOG)
	return false;

	return intel_ddc_probe(intel_output);
	}

	static enum drm_connector_status
	intel_crt_load_detect(struct drm_crtc crtc, struct intel_output intel_output)
	{
	struct drm_encoder *encoder = &intel_output->enc;
	struct drm_device *dev = encoder->dev;
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
	uint32_t pipe = intel_crtc->pipe;
	uint32_t save_bclrpat;
	uint32_t save_vtotal;
	uint32_t vtotal, vactive;
	uint32_t vsample;
	uint32_t vblank, vblank_start, vblank_end;
	uint32_t dsl;
	uint32_t bclrpat_reg;
	uint32_t vtotal_reg;
	uint32_t vblank_reg;
	uint32_t vsync_reg;
	uint32_t pipeconf_reg;
	uint32_t pipe_dsl_reg;
	uint8_t st00;
	enum drm_connector_status status;

	if (pipe == 0) {
	bclrpat_reg = BCLRPAT_A;
	vtotal_reg = VTOTAL_A;
	vblank_reg = VBLANK_A;
	vsync_reg = VSYNC_A;
	pipeconf_reg = PIPEACONF;
	pipe_dsl_reg = PIPEADSL;
	} else {
	bclrpat_reg = BCLRPAT_B;
	vtotal_reg = VTOTAL_B;
	vblank_reg = VBLANK_B;
	vsync_reg = VSYNC_B;
	pipeconf_reg = PIPEBCONF;
	pipe_dsl_reg = PIPEBDSL;
	}

	save_bclrpat = I915_READ(bclrpat_reg);
	save_vtotal = I915_READ(vtotal_reg);
	vblank = I915_READ(vblank_reg);

	vtotal = ((save_vtotal >> 16) & 0xfff) + 1;
	vactive = (save_vtotal & 0x7ff) + 1;

	vblank_start = (vblank & 0xfff) + 1;
	vblank_end = ((vblank >> 16) & 0xfff) + 1;

	/* Set the border color to purple. */
	I915_WRITE(bclrpat_reg, 0x500050);

	if (IS_I9XX(dev)) {
	uint32_t pipeconf = I915_READ(pipeconf_reg);
	I915_WRITE(pipeconf_reg, pipeconf \| PIPECONF_FORCE_BORDER);
	/* Wait for next Vblank to substitue
	* border color for Color info */
	intel_wait_for_vblank(dev);
	st00 = I915_READ8(VGA_MSR_WRITE);
	status = ((st00 & (1 << 4)) != 0) ?
	connector_status_connected :
	connector_status_disconnected;

	I915_WRITE(pipeconf_reg, pipeconf);
	} else {
	bool restore_vblank = false;
	int count, detect;

	/*
	* If there isn't any border, add some.
	* Yes, this will flicker
	*/
	if (vblank_start <= vactive && vblank_end >= vtotal) {
	uint32_t vsync = I915_READ(vsync_reg);
	uint32_t vsync_start = (vsync & 0xffff) + 1;

	vblank_start = vsync_start;
	I915_WRITE(vblank_reg,
	(vblank_start - 1) \|
	((vblank_end - 1) << 16));
	restore_vblank = true;
	}
	/* sample in the vertical border, selecting the larger one */
	if (vblank_start - vactive >= vtotal - vblank_end)
	vsample = (vblank_start + vactive) >> 1;
	else
	vsample = (vtotal + vblank_end) >> 1;

	/*
	* Wait for the border to be displayed
	*/
	while (I915_READ(pipe_dsl_reg) >= vactive)
	;
	while ((dsl = I915_READ(pipe_dsl_reg)) <= vsample)
	;
	/*
	* Watch ST00 for an entire scanline
	*/
	detect = 0;
	count = 0;
	do {
	count++;
	/* Read the ST00 VGA status register */
	st00 = I915_READ8(VGA_MSR_WRITE);
	if (st00 & (1 << 4))
	detect++;
	} while ((I915_READ(pipe_dsl_reg) == dsl));

	/* restore vblank if necessary */
	if (restore_vblank)
	I915_WRITE(vblank_reg, vblank);
	/*
	* If more than 3/4 of the scanline detected a monitor,
	* then it is assumed to be present. This works even on i830,
	* where there isn't any way to force the border color across
	* the screen
	*/
	status = detect * 4 > count * 3 ?
	connector_status_connected :
	connector_status_disconnected;
	}

	/* Restore previous settings */
	I915_WRITE(bclrpat_reg, save_bclrpat);

	return status;
	}

	static enum drm_connector_status intel_crt_detect(struct drm_connector *connector)
	{
	struct drm_device *dev = connector->dev;
	struct intel_output *intel_output = to_intel_output(connector);
	struct drm_encoder *encoder = &intel_output->enc;
	struct drm_crtc *crtc;
	int dpms_mode;
	enum drm_connector_status status;

	if (IS_I9XX(dev) && !IS_I915G(dev) && !IS_I915GM(dev)) {
	if (intel_crt_detect_hotplug(connector))
	return connector_status_connected;
	else
	return connector_status_disconnected;
	}

	if (intel_crt_detect_ddc(connector))
	return connector_status_connected;

	/* for pre-945g platforms use load detect */
	if (encoder->crtc && encoder->crtc->enabled) {
	status = intel_crt_load_detect(encoder->crtc, intel_output);
	} else {
	crtc = intel_get_load_detect_pipe(intel_output,
	NULL, &dpms_mode);
	if (crtc) {
	status = intel_crt_load_detect(crtc, intel_output);
	intel_release_load_detect_pipe(intel_output, dpms_mode);
	} else
	status = connector_status_unknown;
	}

	return status;
	}

	static void intel_crt_destroy(struct drm_connector *connector)
	{
	struct intel_output *intel_output = to_intel_output(connector);

	intel_i2c_destroy(intel_output->ddc_bus);
	drm_sysfs_connector_remove(connector);
	drm_connector_cleanup(connector);
	kfree(connector);
	}

	static int intel_crt_get_modes(struct drm_connector *connector)
	{
	int ret;
	struct intel_output *intel_output = to_intel_output(connector);
	struct i2c_adapter *ddcbus;
	struct drm_device *dev = connector->dev;


	ret = intel_ddc_get_modes(intel_output);
	if (ret \|\| !IS_G4X(dev))
	goto end;

	ddcbus = intel_output->ddc_bus;
	/* Try to probe digital port for output in DVI-I -> VGA mode. */
	intel_output->ddc_bus =
	intel_i2c_create(connector->dev, GPIOD, "CRTDDC_D");

	if (!intel_output->ddc_bus) {
	intel_output->ddc_bus = ddcbus;
	dev_printk(KERN_ERR, &connector->dev->pdev->dev,
	"DDC bus registration failed for CRTDDC_D.\n");
	goto end;
	}
	/* Try to get modes by GPIOD port */
	ret = intel_ddc_get_modes(intel_output);
	intel_i2c_destroy(ddcbus);

	end:
	return ret;

	}

	static int intel_crt_set_property(struct drm_connector *connector,
	struct drm_property *property,
	uint64_t value)
	{
	return 0;
	}

	/*
	* Routines for controlling stuff on the analog port
	*/

	static const struct drm_encoder_helper_funcs intel_crt_helper_funcs = {
	.dpms = intel_crt_dpms,
	.mode_fixup = intel_crt_mode_fixup,
	.prepare = intel_encoder_prepare,
	.commit = intel_encoder_commit,
	.mode_set = intel_crt_mode_set,
	};

	static const struct drm_connector_funcs intel_crt_connector_funcs = {
	.dpms = drm_helper_connector_dpms,
	.detect = intel_crt_detect,
	.fill_modes = drm_helper_probe_single_connector_modes,
	.destroy = intel_crt_destroy,
	.set_property = intel_crt_set_property,
	};

	static const struct drm_connector_helper_funcs intel_crt_connector_helper_funcs = {
	.mode_valid = intel_crt_mode_valid,
	.get_modes = intel_crt_get_modes,
	.best_encoder = intel_best_encoder,
	};

	static void intel_crt_enc_destroy(struct drm_encoder *encoder)
	{
	drm_encoder_cleanup(encoder);
	}

	static const struct drm_encoder_funcs intel_crt_enc_funcs = {
	.destroy = intel_crt_enc_destroy,
	};

	void intel_crt_init(struct drm_device *dev)
	{
	struct drm_connector *connector;
	struct intel_output *intel_output;
	struct drm_i915_private *dev_priv = dev->dev_private;
	u32 i2c_reg;

	intel_output = kzalloc(sizeof(struct intel_output), GFP_KERNEL);
	if (!intel_output)
	return;

	connector = &intel_output->base;
	drm_connector_init(dev, &intel_output->base,
	&intel_crt_connector_funcs, DRM_MODE_CONNECTOR_VGA);

	drm_encoder_init(dev, &intel_output->enc, &intel_crt_enc_funcs,
	DRM_MODE_ENCODER_DAC);

	drm_mode_connector_attach_encoder(&intel_output->base,
	&intel_output->enc);

	/* Set up the DDC bus. */
	if (IS_IRONLAKE(dev))
	i2c_reg = PCH_GPIOA;
	else {
	i2c_reg = GPIOA;
	/* Use VBT information for CRT DDC if available */
	if (dev_priv->crt_ddc_bus != 0)
	i2c_reg = dev_priv->crt_ddc_bus;
	}
	intel_output->ddc_bus = intel_i2c_create(dev, i2c_reg, "CRTDDC_A");
	if (!intel_output->ddc_bus) {
	dev_printk(KERN_ERR, &dev->pdev->dev, "DDC bus registration "
	"failed.\n");
	return;
	}

	intel_output->type = INTEL_OUTPUT_ANALOG;
	intel_output->clone_mask = (1 << INTEL_SDVO_NON_TV_CLONE_BIT) \|
	(1 << INTEL_ANALOG_CLONE_BIT) \|
	(1 << INTEL_SDVO_LVDS_CLONE_BIT);
	intel_output->crtc_mask = (1 << 0) \| (1 << 1);
	connector->interlace_allowed = 0;
	connector->doublescan_allowed = 0;

	drm_encoder_helper_add(&intel_output->enc, &intel_crt_helper_funcs);
	drm_connector_helper_add(connector, &intel_crt_connector_helper_funcs);

	drm_sysfs_connector_add(connector);
	}