drivers/gpu/drm/i915/i915_suspend.c - kernel/msm-4.19 - Gitiles

 /*
  *
  * Copyright 2008 (c) Intel Corporation
  *   Jesse Barnes <jbarnes@virtuousgeek.org>
  *
  * 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, sub license, 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 NON-INFRINGEMENT.
  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS 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.
  */

 #include <drm/drmP.h>
 #include <drm/i915_drm.h>
 #include "intel_drv.h"
 #include "i915_reg.h"

 static u8 i915_read_indexed(struct drm_device *dev, u16 index_port, u16 data_port, u8 reg)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;

 	I915_WRITE8(index_port, reg);
 	return I915_READ8(data_port);
 }

 static u8 i915_read_ar(struct drm_device *dev, u16 st01, u8 reg, u16 palette_enable)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;

 	I915_READ8(st01);
 	I915_WRITE8(VGA_AR_INDEX, palette_enable | reg);
 	return I915_READ8(VGA_AR_DATA_READ);
 }

 static void i915_write_ar(struct drm_device *dev, u16 st01, u8 reg, u8 val, u16 palette_enable)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;

 	I915_READ8(st01);
 	I915_WRITE8(VGA_AR_INDEX, palette_enable | reg);
 	I915_WRITE8(VGA_AR_DATA_WRITE, val);
 }

 static void i915_write_indexed(struct drm_device *dev, u16 index_port, u16 data_port, u8 reg, u8 val)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;

 	I915_WRITE8(index_port, reg);
 	I915_WRITE8(data_port, val);
 }

 static void i915_save_vga(struct drm_device *dev)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	int i;
 	u16 cr_index, cr_data, st01;

 	/* VGA state */
 	dev_priv->regfile.saveVGA0 = I915_READ(VGA0);
 	dev_priv->regfile.saveVGA1 = I915_READ(VGA1);
 	dev_priv->regfile.saveVGA_PD = I915_READ(VGA_PD);
 	dev_priv->regfile.saveVGACNTRL = I915_READ(i915_vgacntrl_reg(dev));

 	/* VGA color palette registers */
 	dev_priv->regfile.saveDACMASK = I915_READ8(VGA_DACMASK);

 	/* MSR bits */
 	dev_priv->regfile.saveMSR = I915_READ8(VGA_MSR_READ);
 	if (dev_priv->regfile.saveMSR & VGA_MSR_CGA_MODE) {
 		cr_index = VGA_CR_INDEX_CGA;
 		cr_data = VGA_CR_DATA_CGA;
 		st01 = VGA_ST01_CGA;
 	} else {
 		cr_index = VGA_CR_INDEX_MDA;
 		cr_data = VGA_CR_DATA_MDA;
 		st01 = VGA_ST01_MDA;
 	}

 	/* CRT controller regs */
 	i915_write_indexed(dev, cr_index, cr_data, 0x11,
 			   i915_read_indexed(dev, cr_index, cr_data, 0x11) &
 			   (~0x80));
 	for (i = 0; i <= 0x24; i++)
 		dev_priv->regfile.saveCR[i] =
 			i915_read_indexed(dev, cr_index, cr_data, i);
 	/* Make sure we don't turn off CR group 0 writes */
 	dev_priv->regfile.saveCR[0x11] &= ~0x80;

 	/* Attribute controller registers */
 	I915_READ8(st01);
 	dev_priv->regfile.saveAR_INDEX = I915_READ8(VGA_AR_INDEX);
 	for (i = 0; i <= 0x14; i++)
 		dev_priv->regfile.saveAR[i] = i915_read_ar(dev, st01, i, 0);
 	I915_READ8(st01);
 	I915_WRITE8(VGA_AR_INDEX, dev_priv->regfile.saveAR_INDEX);
 	I915_READ8(st01);

 	/* Graphics controller registers */
 	for (i = 0; i < 9; i++)
 		dev_priv->regfile.saveGR[i] =
 			i915_read_indexed(dev, VGA_GR_INDEX, VGA_GR_DATA, i);

 	dev_priv->regfile.saveGR[0x10] =
 		i915_read_indexed(dev, VGA_GR_INDEX, VGA_GR_DATA, 0x10);
 	dev_priv->regfile.saveGR[0x11] =
 		i915_read_indexed(dev, VGA_GR_INDEX, VGA_GR_DATA, 0x11);
 	dev_priv->regfile.saveGR[0x18] =
 		i915_read_indexed(dev, VGA_GR_INDEX, VGA_GR_DATA, 0x18);

 	/* Sequencer registers */
 	for (i = 0; i < 8; i++)
 		dev_priv->regfile.saveSR[i] =
 			i915_read_indexed(dev, VGA_SR_INDEX, VGA_SR_DATA, i);
 }

 static void i915_restore_vga(struct drm_device *dev)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	int i;
 	u16 cr_index, cr_data, st01;

 	/* VGA state */
 	I915_WRITE(i915_vgacntrl_reg(dev), dev_priv->regfile.saveVGACNTRL);

 	I915_WRITE(VGA0, dev_priv->regfile.saveVGA0);
 	I915_WRITE(VGA1, dev_priv->regfile.saveVGA1);
 	I915_WRITE(VGA_PD, dev_priv->regfile.saveVGA_PD);
 	POSTING_READ(VGA_PD);
 	udelay(150);

 	/* MSR bits */
 	I915_WRITE8(VGA_MSR_WRITE, dev_priv->regfile.saveMSR);
 	if (dev_priv->regfile.saveMSR & VGA_MSR_CGA_MODE) {
 		cr_index = VGA_CR_INDEX_CGA;
 		cr_data = VGA_CR_DATA_CGA;
 		st01 = VGA_ST01_CGA;
 	} else {
 		cr_index = VGA_CR_INDEX_MDA;
 		cr_data = VGA_CR_DATA_MDA;
 		st01 = VGA_ST01_MDA;
 	}

 	/* Sequencer registers, don't write SR07 */
 	for (i = 0; i < 7; i++)
 		i915_write_indexed(dev, VGA_SR_INDEX, VGA_SR_DATA, i,
 				   dev_priv->regfile.saveSR[i]);

 	/* CRT controller regs */
 	/* Enable CR group 0 writes */
 	i915_write_indexed(dev, cr_index, cr_data, 0x11, dev_priv->regfile.saveCR[0x11]);
 	for (i = 0; i <= 0x24; i++)
 		i915_write_indexed(dev, cr_index, cr_data, i, dev_priv->regfile.saveCR[i]);

 	/* Graphics controller regs */
 	for (i = 0; i < 9; i++)
 		i915_write_indexed(dev, VGA_GR_INDEX, VGA_GR_DATA, i,
 				   dev_priv->regfile.saveGR[i]);

 	i915_write_indexed(dev, VGA_GR_INDEX, VGA_GR_DATA, 0x10,
 			   dev_priv->regfile.saveGR[0x10]);
 	i915_write_indexed(dev, VGA_GR_INDEX, VGA_GR_DATA, 0x11,
 			   dev_priv->regfile.saveGR[0x11]);
 	i915_write_indexed(dev, VGA_GR_INDEX, VGA_GR_DATA, 0x18,
 			   dev_priv->regfile.saveGR[0x18]);

 	/* Attribute controller registers */
 	I915_READ8(st01); /* switch back to index mode */
 	for (i = 0; i <= 0x14; i++)
 		i915_write_ar(dev, st01, i, dev_priv->regfile.saveAR[i], 0);
 	I915_READ8(st01); /* switch back to index mode */
 	I915_WRITE8(VGA_AR_INDEX, dev_priv->regfile.saveAR_INDEX | 0x20);
 	I915_READ8(st01);

 	/* VGA color palette registers */
 	I915_WRITE8(VGA_DACMASK, dev_priv->regfile.saveDACMASK);
 }

 static void i915_save_display(struct drm_device *dev)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	unsigned long flags;

 	/* Display arbitration control */
 	if (INTEL_INFO(dev)->gen <= 4)
 		dev_priv->regfile.saveDSPARB = I915_READ(DSPARB);

 	/* This is only meaningful in non-KMS mode */
 	/* Don't regfile.save them in KMS mode */
 	if (!drm_core_check_feature(dev, DRIVER_MODESET))
 		i915_save_display_reg(dev);

 	spin_lock_irqsave(&dev_priv->backlight.lock, flags);

 	/* LVDS state */
 	if (HAS_PCH_SPLIT(dev)) {
 		dev_priv->regfile.savePP_CONTROL = I915_READ(PCH_PP_CONTROL);
 		dev_priv->regfile.saveBLC_PWM_CTL = I915_READ(BLC_PWM_PCH_CTL1);
 		dev_priv->regfile.saveBLC_PWM_CTL2 = I915_READ(BLC_PWM_PCH_CTL2);
 		dev_priv->regfile.saveBLC_CPU_PWM_CTL = I915_READ(BLC_PWM_CPU_CTL);
 		dev_priv->regfile.saveBLC_CPU_PWM_CTL2 = I915_READ(BLC_PWM_CPU_CTL2);
 		if (HAS_PCH_IBX(dev) || HAS_PCH_CPT(dev))
 			dev_priv->regfile.saveLVDS = I915_READ(PCH_LVDS);
 	} else {
 		dev_priv->regfile.savePP_CONTROL = I915_READ(PP_CONTROL);
 		dev_priv->regfile.savePFIT_PGM_RATIOS = I915_READ(PFIT_PGM_RATIOS);
 		dev_priv->regfile.saveBLC_PWM_CTL = I915_READ(BLC_PWM_CTL);
 		dev_priv->regfile.saveBLC_HIST_CTL = I915_READ(BLC_HIST_CTL);
 		if (INTEL_INFO(dev)->gen >= 4)
 			dev_priv->regfile.saveBLC_PWM_CTL2 = I915_READ(BLC_PWM_CTL2);
 		if (IS_MOBILE(dev) && !IS_I830(dev))
 			dev_priv->regfile.saveLVDS = I915_READ(LVDS);
 	}

 	spin_unlock_irqrestore(&dev_priv->backlight.lock, flags);

 	if (!IS_I830(dev) && !IS_845G(dev) && !HAS_PCH_SPLIT(dev))
 		dev_priv->regfile.savePFIT_CONTROL = I915_READ(PFIT_CONTROL);

 	if (HAS_PCH_SPLIT(dev)) {
 		dev_priv->regfile.savePP_ON_DELAYS = I915_READ(PCH_PP_ON_DELAYS);
 		dev_priv->regfile.savePP_OFF_DELAYS = I915_READ(PCH_PP_OFF_DELAYS);
 		dev_priv->regfile.savePP_DIVISOR = I915_READ(PCH_PP_DIVISOR);
 	} else {
 		dev_priv->regfile.savePP_ON_DELAYS = I915_READ(PP_ON_DELAYS);
 		dev_priv->regfile.savePP_OFF_DELAYS = I915_READ(PP_OFF_DELAYS);
 		dev_priv->regfile.savePP_DIVISOR = I915_READ(PP_DIVISOR);
 	}

 	/* Only regfile.save FBC state on the platform that supports FBC */
 	if (I915_HAS_FBC(dev)) {
 		if (HAS_PCH_SPLIT(dev)) {
 			dev_priv->regfile.saveDPFC_CB_BASE = I915_READ(ILK_DPFC_CB_BASE);
 		} else if (IS_GM45(dev)) {
 			dev_priv->regfile.saveDPFC_CB_BASE = I915_READ(DPFC_CB_BASE);
 		} else {
 			dev_priv->regfile.saveFBC_CFB_BASE = I915_READ(FBC_CFB_BASE);
 			dev_priv->regfile.saveFBC_LL_BASE = I915_READ(FBC_LL_BASE);
 			dev_priv->regfile.saveFBC_CONTROL2 = I915_READ(FBC_CONTROL2);
 			dev_priv->regfile.saveFBC_CONTROL = I915_READ(FBC_CONTROL);
 		}
 	}

 	if (!drm_core_check_feature(dev, DRIVER_MODESET))
 		i915_save_vga(dev);
 }

 static void i915_restore_display(struct drm_device *dev)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	u32 mask = 0xffffffff;
 	unsigned long flags;

 	/* Display arbitration */
 	if (INTEL_INFO(dev)->gen <= 4)
 		I915_WRITE(DSPARB, dev_priv->regfile.saveDSPARB);

 	if (!drm_core_check_feature(dev, DRIVER_MODESET))
 		i915_restore_display_reg(dev);

 	spin_lock_irqsave(&dev_priv->backlight.lock, flags);

 	/* LVDS state */
 	if (INTEL_INFO(dev)->gen >= 4 && !HAS_PCH_SPLIT(dev))
 		I915_WRITE(BLC_PWM_CTL2, dev_priv->regfile.saveBLC_PWM_CTL2);

 	if (drm_core_check_feature(dev, DRIVER_MODESET))
 		mask = ~LVDS_PORT_EN;

 	if (HAS_PCH_IBX(dev) || HAS_PCH_CPT(dev))
 		I915_WRITE(PCH_LVDS, dev_priv->regfile.saveLVDS & mask);
 	else if (INTEL_INFO(dev)->gen <= 4 && IS_MOBILE(dev) && !IS_I830(dev))
 		I915_WRITE(LVDS, dev_priv->regfile.saveLVDS & mask);

 	if (!IS_I830(dev) && !IS_845G(dev) && !HAS_PCH_SPLIT(dev))
 		I915_WRITE(PFIT_CONTROL, dev_priv->regfile.savePFIT_CONTROL);

 	if (HAS_PCH_SPLIT(dev)) {
 		I915_WRITE(BLC_PWM_PCH_CTL1, dev_priv->regfile.saveBLC_PWM_CTL);
 		I915_WRITE(BLC_PWM_PCH_CTL2, dev_priv->regfile.saveBLC_PWM_CTL2);
 		/* NOTE: BLC_PWM_CPU_CTL must be written after BLC_PWM_CPU_CTL2;
 		 * otherwise we get blank eDP screen after S3 on some machines
 		 */
 		I915_WRITE(BLC_PWM_CPU_CTL2, dev_priv->regfile.saveBLC_CPU_PWM_CTL2);
 		I915_WRITE(BLC_PWM_CPU_CTL, dev_priv->regfile.saveBLC_CPU_PWM_CTL);
 		I915_WRITE(PCH_PP_ON_DELAYS, dev_priv->regfile.savePP_ON_DELAYS);
 		I915_WRITE(PCH_PP_OFF_DELAYS, dev_priv->regfile.savePP_OFF_DELAYS);
 		I915_WRITE(PCH_PP_DIVISOR, dev_priv->regfile.savePP_DIVISOR);
 		I915_WRITE(PCH_PP_CONTROL, dev_priv->regfile.savePP_CONTROL);
 		I915_WRITE(RSTDBYCTL,
 			   dev_priv->regfile.saveMCHBAR_RENDER_STANDBY);
 	} else {
 		I915_WRITE(PFIT_PGM_RATIOS, dev_priv->regfile.savePFIT_PGM_RATIOS);
 		I915_WRITE(BLC_PWM_CTL, dev_priv->regfile.saveBLC_PWM_CTL);
 		I915_WRITE(BLC_HIST_CTL, dev_priv->regfile.saveBLC_HIST_CTL);
 		I915_WRITE(PP_ON_DELAYS, dev_priv->regfile.savePP_ON_DELAYS);
 		I915_WRITE(PP_OFF_DELAYS, dev_priv->regfile.savePP_OFF_DELAYS);
 		I915_WRITE(PP_DIVISOR, dev_priv->regfile.savePP_DIVISOR);
 		I915_WRITE(PP_CONTROL, dev_priv->regfile.savePP_CONTROL);
 	}

 	spin_unlock_irqrestore(&dev_priv->backlight.lock, flags);

 	/* only restore FBC info on the platform that supports FBC*/
 	intel_disable_fbc(dev);
 	if (I915_HAS_FBC(dev)) {
 		if (HAS_PCH_SPLIT(dev)) {
 			I915_WRITE(ILK_DPFC_CB_BASE, dev_priv->regfile.saveDPFC_CB_BASE);
 		} else if (IS_GM45(dev)) {
 			I915_WRITE(DPFC_CB_BASE, dev_priv->regfile.saveDPFC_CB_BASE);
 		} else {
 			I915_WRITE(FBC_CFB_BASE, dev_priv->regfile.saveFBC_CFB_BASE);
 			I915_WRITE(FBC_LL_BASE, dev_priv->regfile.saveFBC_LL_BASE);
 			I915_WRITE(FBC_CONTROL2, dev_priv->regfile.saveFBC_CONTROL2);
 			I915_WRITE(FBC_CONTROL, dev_priv->regfile.saveFBC_CONTROL);
 		}
 	}

 	if (!drm_core_check_feature(dev, DRIVER_MODESET))
 		i915_restore_vga(dev);
 	else
 		i915_redisable_vga(dev);
 }

 int i915_save_state(struct drm_device *dev)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	int i;

 	if (INTEL_INFO(dev)->gen <= 4)
 		pci_read_config_byte(dev->pdev, LBB,
 				     &dev_priv->regfile.saveLBB);

 	mutex_lock(&dev->struct_mutex);

 	i915_save_display(dev);

 	if (!drm_core_check_feature(dev, DRIVER_MODESET)) {
 		/* Interrupt state */
 		if (HAS_PCH_SPLIT(dev)) {
 			dev_priv->regfile.saveDEIER = I915_READ(DEIER);
 			dev_priv->regfile.saveDEIMR = I915_READ(DEIMR);
 			dev_priv->regfile.saveGTIER = I915_READ(GTIER);
 			dev_priv->regfile.saveGTIMR = I915_READ(GTIMR);
 			dev_priv->regfile.saveFDI_RXA_IMR = I915_READ(_FDI_RXA_IMR);
 			dev_priv->regfile.saveFDI_RXB_IMR = I915_READ(_FDI_RXB_IMR);
 			dev_priv->regfile.saveMCHBAR_RENDER_STANDBY =
 				I915_READ(RSTDBYCTL);
 			dev_priv->regfile.savePCH_PORT_HOTPLUG = I915_READ(PCH_PORT_HOTPLUG);
 		} else {
 			dev_priv->regfile.saveIER = I915_READ(IER);
 			dev_priv->regfile.saveIMR = I915_READ(IMR);
 		}
 	}

 	intel_disable_gt_powersave(dev);

 	/* Cache mode state */
 	dev_priv->regfile.saveCACHE_MODE_0 = I915_READ(CACHE_MODE_0);

 	/* Memory Arbitration state */
 	dev_priv->regfile.saveMI_ARB_STATE = I915_READ(MI_ARB_STATE);

 	/* Scratch space */
 	for (i = 0; i < 16; i++) {
 		dev_priv->regfile.saveSWF0[i] = I915_READ(SWF00 + (i << 2));
 		dev_priv->regfile.saveSWF1[i] = I915_READ(SWF10 + (i << 2));
 	}
 	for (i = 0; i < 3; i++)
 		dev_priv->regfile.saveSWF2[i] = I915_READ(SWF30 + (i << 2));

 	mutex_unlock(&dev->struct_mutex);

 	return 0;
 }

 int i915_restore_state(struct drm_device *dev)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	int i;

 	if (INTEL_INFO(dev)->gen <= 4)
 		pci_write_config_byte(dev->pdev, LBB,
 				      dev_priv->regfile.saveLBB);

 	mutex_lock(&dev->struct_mutex);

 	i915_gem_restore_fences(dev);
 	i915_restore_display(dev);

 	if (!drm_core_check_feature(dev, DRIVER_MODESET)) {
 		/* Interrupt state */
 		if (HAS_PCH_SPLIT(dev)) {
 			I915_WRITE(DEIER, dev_priv->regfile.saveDEIER);
 			I915_WRITE(DEIMR, dev_priv->regfile.saveDEIMR);
 			I915_WRITE(GTIER, dev_priv->regfile.saveGTIER);
 			I915_WRITE(GTIMR, dev_priv->regfile.saveGTIMR);
 			I915_WRITE(_FDI_RXA_IMR, dev_priv->regfile.saveFDI_RXA_IMR);
 			I915_WRITE(_FDI_RXB_IMR, dev_priv->regfile.saveFDI_RXB_IMR);
 			I915_WRITE(PCH_PORT_HOTPLUG, dev_priv->regfile.savePCH_PORT_HOTPLUG);
 		} else {
 			I915_WRITE(IER, dev_priv->regfile.saveIER);
 			I915_WRITE(IMR, dev_priv->regfile.saveIMR);
 		}
 	}

 	/* Cache mode state */
 	I915_WRITE(CACHE_MODE_0, dev_priv->regfile.saveCACHE_MODE_0 | 0xffff0000);

 	/* Memory arbitration state */
 	I915_WRITE(MI_ARB_STATE, dev_priv->regfile.saveMI_ARB_STATE | 0xffff0000);

 	for (i = 0; i < 16; i++) {
 		I915_WRITE(SWF00 + (i << 2), dev_priv->regfile.saveSWF0[i]);
 		I915_WRITE(SWF10 + (i << 2), dev_priv->regfile.saveSWF1[i]);
 	}
 	for (i = 0; i < 3; i++)
 		I915_WRITE(SWF30 + (i << 2), dev_priv->regfile.saveSWF2[i]);

 	mutex_unlock(&dev->struct_mutex);

 	intel_i2c_reset(dev);

 	return 0;
 }
	/*
	*
	* Copyright 2008 (c) Intel Corporation
	* Jesse Barnes <jbarnes@virtuousgeek.org>
	*
	* 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, sub license, 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 NON-INFRINGEMENT.
	* IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS 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.
	*/

	#include <drm/drmP.h>
	#include <drm/i915_drm.h>
	#include "intel_drv.h"
	#include "i915_reg.h"

	static u8 i915_read_indexed(struct drm_device *dev, u16 index_port, u16 data_port, u8 reg)
	{
	struct drm_i915_private *dev_priv = dev->dev_private;

	I915_WRITE8(index_port, reg);
	return I915_READ8(data_port);
	}

	static u8 i915_read_ar(struct drm_device *dev, u16 st01, u8 reg, u16 palette_enable)
	{
	struct drm_i915_private *dev_priv = dev->dev_private;

	I915_READ8(st01);
	I915_WRITE8(VGA_AR_INDEX, palette_enable \| reg);
	return I915_READ8(VGA_AR_DATA_READ);
	}

	static void i915_write_ar(struct drm_device *dev, u16 st01, u8 reg, u8 val, u16 palette_enable)
	{
	struct drm_i915_private *dev_priv = dev->dev_private;

	I915_READ8(st01);
	I915_WRITE8(VGA_AR_INDEX, palette_enable \| reg);
	I915_WRITE8(VGA_AR_DATA_WRITE, val);
	}

	static void i915_write_indexed(struct drm_device *dev, u16 index_port, u16 data_port, u8 reg, u8 val)
	{
	struct drm_i915_private *dev_priv = dev->dev_private;

	I915_WRITE8(index_port, reg);
	I915_WRITE8(data_port, val);
	}

	static void i915_save_vga(struct drm_device *dev)
	{
	struct drm_i915_private *dev_priv = dev->dev_private;
	int i;
	u16 cr_index, cr_data, st01;

	/* VGA state */
	dev_priv->regfile.saveVGA0 = I915_READ(VGA0);
	dev_priv->regfile.saveVGA1 = I915_READ(VGA1);
	dev_priv->regfile.saveVGA_PD = I915_READ(VGA_PD);
	dev_priv->regfile.saveVGACNTRL = I915_READ(i915_vgacntrl_reg(dev));

	/* VGA color palette registers */
	dev_priv->regfile.saveDACMASK = I915_READ8(VGA_DACMASK);

	/* MSR bits */
	dev_priv->regfile.saveMSR = I915_READ8(VGA_MSR_READ);
	if (dev_priv->regfile.saveMSR & VGA_MSR_CGA_MODE) {
	cr_index = VGA_CR_INDEX_CGA;
	cr_data = VGA_CR_DATA_CGA;
	st01 = VGA_ST01_CGA;
	} else {
	cr_index = VGA_CR_INDEX_MDA;
	cr_data = VGA_CR_DATA_MDA;
	st01 = VGA_ST01_MDA;
	}

	/* CRT controller regs */
	i915_write_indexed(dev, cr_index, cr_data, 0x11,
	i915_read_indexed(dev, cr_index, cr_data, 0x11) &
	(~0x80));
	for (i = 0; i <= 0x24; i++)
	dev_priv->regfile.saveCR[i] =
	i915_read_indexed(dev, cr_index, cr_data, i);
	/* Make sure we don't turn off CR group 0 writes */
	dev_priv->regfile.saveCR[0x11] &= ~0x80;

	/* Attribute controller registers */
	I915_READ8(st01);
	dev_priv->regfile.saveAR_INDEX = I915_READ8(VGA_AR_INDEX);
	for (i = 0; i <= 0x14; i++)
	dev_priv->regfile.saveAR[i] = i915_read_ar(dev, st01, i, 0);
	I915_READ8(st01);
	I915_WRITE8(VGA_AR_INDEX, dev_priv->regfile.saveAR_INDEX);
	I915_READ8(st01);

	/* Graphics controller registers */
	for (i = 0; i < 9; i++)
	dev_priv->regfile.saveGR[i] =
	i915_read_indexed(dev, VGA_GR_INDEX, VGA_GR_DATA, i);

	dev_priv->regfile.saveGR[0x10] =
	i915_read_indexed(dev, VGA_GR_INDEX, VGA_GR_DATA, 0x10);
	dev_priv->regfile.saveGR[0x11] =
	i915_read_indexed(dev, VGA_GR_INDEX, VGA_GR_DATA, 0x11);
	dev_priv->regfile.saveGR[0x18] =
	i915_read_indexed(dev, VGA_GR_INDEX, VGA_GR_DATA, 0x18);

	/* Sequencer registers */
	for (i = 0; i < 8; i++)
	dev_priv->regfile.saveSR[i] =
	i915_read_indexed(dev, VGA_SR_INDEX, VGA_SR_DATA, i);
	}

	static void i915_restore_vga(struct drm_device *dev)
	{
	struct drm_i915_private *dev_priv = dev->dev_private;
	int i;
	u16 cr_index, cr_data, st01;

	/* VGA state */
	I915_WRITE(i915_vgacntrl_reg(dev), dev_priv->regfile.saveVGACNTRL);

	I915_WRITE(VGA0, dev_priv->regfile.saveVGA0);
	I915_WRITE(VGA1, dev_priv->regfile.saveVGA1);
	I915_WRITE(VGA_PD, dev_priv->regfile.saveVGA_PD);
	POSTING_READ(VGA_PD);
	udelay(150);

	/* MSR bits */
	I915_WRITE8(VGA_MSR_WRITE, dev_priv->regfile.saveMSR);
	if (dev_priv->regfile.saveMSR & VGA_MSR_CGA_MODE) {
	cr_index = VGA_CR_INDEX_CGA;
	cr_data = VGA_CR_DATA_CGA;
	st01 = VGA_ST01_CGA;
	} else {
	cr_index = VGA_CR_INDEX_MDA;
	cr_data = VGA_CR_DATA_MDA;
	st01 = VGA_ST01_MDA;
	}

	/* Sequencer registers, don't write SR07 */
	for (i = 0; i < 7; i++)
	i915_write_indexed(dev, VGA_SR_INDEX, VGA_SR_DATA, i,
	dev_priv->regfile.saveSR[i]);

	/* CRT controller regs */
	/* Enable CR group 0 writes */
	i915_write_indexed(dev, cr_index, cr_data, 0x11, dev_priv->regfile.saveCR[0x11]);
	for (i = 0; i <= 0x24; i++)
	i915_write_indexed(dev, cr_index, cr_data, i, dev_priv->regfile.saveCR[i]);

	/* Graphics controller regs */
	for (i = 0; i < 9; i++)
	i915_write_indexed(dev, VGA_GR_INDEX, VGA_GR_DATA, i,
	dev_priv->regfile.saveGR[i]);

	i915_write_indexed(dev, VGA_GR_INDEX, VGA_GR_DATA, 0x10,
	dev_priv->regfile.saveGR[0x10]);
	i915_write_indexed(dev, VGA_GR_INDEX, VGA_GR_DATA, 0x11,
	dev_priv->regfile.saveGR[0x11]);
	i915_write_indexed(dev, VGA_GR_INDEX, VGA_GR_DATA, 0x18,
	dev_priv->regfile.saveGR[0x18]);

	/* Attribute controller registers */
	I915_READ8(st01); /* switch back to index mode */
	for (i = 0; i <= 0x14; i++)
	i915_write_ar(dev, st01, i, dev_priv->regfile.saveAR[i], 0);
	I915_READ8(st01); /* switch back to index mode */
	I915_WRITE8(VGA_AR_INDEX, dev_priv->regfile.saveAR_INDEX \| 0x20);
	I915_READ8(st01);

	/* VGA color palette registers */
	I915_WRITE8(VGA_DACMASK, dev_priv->regfile.saveDACMASK);
	}

	static void i915_save_display(struct drm_device *dev)
	{
	struct drm_i915_private *dev_priv = dev->dev_private;
	unsigned long flags;

	/* Display arbitration control */
	if (INTEL_INFO(dev)->gen <= 4)
	dev_priv->regfile.saveDSPARB = I915_READ(DSPARB);

	/* This is only meaningful in non-KMS mode */
	/* Don't regfile.save them in KMS mode */
	if (!drm_core_check_feature(dev, DRIVER_MODESET))
	i915_save_display_reg(dev);

	spin_lock_irqsave(&dev_priv->backlight.lock, flags);

	/* LVDS state */
	if (HAS_PCH_SPLIT(dev)) {
	dev_priv->regfile.savePP_CONTROL = I915_READ(PCH_PP_CONTROL);
	dev_priv->regfile.saveBLC_PWM_CTL = I915_READ(BLC_PWM_PCH_CTL1);
	dev_priv->regfile.saveBLC_PWM_CTL2 = I915_READ(BLC_PWM_PCH_CTL2);
	dev_priv->regfile.saveBLC_CPU_PWM_CTL = I915_READ(BLC_PWM_CPU_CTL);
	dev_priv->regfile.saveBLC_CPU_PWM_CTL2 = I915_READ(BLC_PWM_CPU_CTL2);
	if (HAS_PCH_IBX(dev) \|\| HAS_PCH_CPT(dev))
	dev_priv->regfile.saveLVDS = I915_READ(PCH_LVDS);
	} else {
	dev_priv->regfile.savePP_CONTROL = I915_READ(PP_CONTROL);
	dev_priv->regfile.savePFIT_PGM_RATIOS = I915_READ(PFIT_PGM_RATIOS);
	dev_priv->regfile.saveBLC_PWM_CTL = I915_READ(BLC_PWM_CTL);
	dev_priv->regfile.saveBLC_HIST_CTL = I915_READ(BLC_HIST_CTL);
	if (INTEL_INFO(dev)->gen >= 4)
	dev_priv->regfile.saveBLC_PWM_CTL2 = I915_READ(BLC_PWM_CTL2);
	if (IS_MOBILE(dev) && !IS_I830(dev))
	dev_priv->regfile.saveLVDS = I915_READ(LVDS);
	}

	spin_unlock_irqrestore(&dev_priv->backlight.lock, flags);

	if (!IS_I830(dev) && !IS_845G(dev) && !HAS_PCH_SPLIT(dev))
	dev_priv->regfile.savePFIT_CONTROL = I915_READ(PFIT_CONTROL);

	if (HAS_PCH_SPLIT(dev)) {
	dev_priv->regfile.savePP_ON_DELAYS = I915_READ(PCH_PP_ON_DELAYS);
	dev_priv->regfile.savePP_OFF_DELAYS = I915_READ(PCH_PP_OFF_DELAYS);
	dev_priv->regfile.savePP_DIVISOR = I915_READ(PCH_PP_DIVISOR);
	} else {
	dev_priv->regfile.savePP_ON_DELAYS = I915_READ(PP_ON_DELAYS);
	dev_priv->regfile.savePP_OFF_DELAYS = I915_READ(PP_OFF_DELAYS);
	dev_priv->regfile.savePP_DIVISOR = I915_READ(PP_DIVISOR);
	}

	/* Only regfile.save FBC state on the platform that supports FBC */
	if (I915_HAS_FBC(dev)) {
	if (HAS_PCH_SPLIT(dev)) {
	dev_priv->regfile.saveDPFC_CB_BASE = I915_READ(ILK_DPFC_CB_BASE);
	} else if (IS_GM45(dev)) {
	dev_priv->regfile.saveDPFC_CB_BASE = I915_READ(DPFC_CB_BASE);
	} else {
	dev_priv->regfile.saveFBC_CFB_BASE = I915_READ(FBC_CFB_BASE);
	dev_priv->regfile.saveFBC_LL_BASE = I915_READ(FBC_LL_BASE);
	dev_priv->regfile.saveFBC_CONTROL2 = I915_READ(FBC_CONTROL2);
	dev_priv->regfile.saveFBC_CONTROL = I915_READ(FBC_CONTROL);
	}
	}

	if (!drm_core_check_feature(dev, DRIVER_MODESET))
	i915_save_vga(dev);
	}

	static void i915_restore_display(struct drm_device *dev)
	{
	struct drm_i915_private *dev_priv = dev->dev_private;
	u32 mask = 0xffffffff;
	unsigned long flags;

	/* Display arbitration */
	if (INTEL_INFO(dev)->gen <= 4)
	I915_WRITE(DSPARB, dev_priv->regfile.saveDSPARB);

	if (!drm_core_check_feature(dev, DRIVER_MODESET))
	i915_restore_display_reg(dev);

	spin_lock_irqsave(&dev_priv->backlight.lock, flags);

	/* LVDS state */
	if (INTEL_INFO(dev)->gen >= 4 && !HAS_PCH_SPLIT(dev))
	I915_WRITE(BLC_PWM_CTL2, dev_priv->regfile.saveBLC_PWM_CTL2);

	if (drm_core_check_feature(dev, DRIVER_MODESET))
	mask = ~LVDS_PORT_EN;

	if (HAS_PCH_IBX(dev) \|\| HAS_PCH_CPT(dev))
	I915_WRITE(PCH_LVDS, dev_priv->regfile.saveLVDS & mask);
	else if (INTEL_INFO(dev)->gen <= 4 && IS_MOBILE(dev) && !IS_I830(dev))
	I915_WRITE(LVDS, dev_priv->regfile.saveLVDS & mask);

	if (!IS_I830(dev) && !IS_845G(dev) && !HAS_PCH_SPLIT(dev))
	I915_WRITE(PFIT_CONTROL, dev_priv->regfile.savePFIT_CONTROL);

	if (HAS_PCH_SPLIT(dev)) {
	I915_WRITE(BLC_PWM_PCH_CTL1, dev_priv->regfile.saveBLC_PWM_CTL);
	I915_WRITE(BLC_PWM_PCH_CTL2, dev_priv->regfile.saveBLC_PWM_CTL2);
	/* NOTE: BLC_PWM_CPU_CTL must be written after BLC_PWM_CPU_CTL2;
	* otherwise we get blank eDP screen after S3 on some machines
	*/
	I915_WRITE(BLC_PWM_CPU_CTL2, dev_priv->regfile.saveBLC_CPU_PWM_CTL2);
	I915_WRITE(BLC_PWM_CPU_CTL, dev_priv->regfile.saveBLC_CPU_PWM_CTL);
	I915_WRITE(PCH_PP_ON_DELAYS, dev_priv->regfile.savePP_ON_DELAYS);
	I915_WRITE(PCH_PP_OFF_DELAYS, dev_priv->regfile.savePP_OFF_DELAYS);
	I915_WRITE(PCH_PP_DIVISOR, dev_priv->regfile.savePP_DIVISOR);
	I915_WRITE(PCH_PP_CONTROL, dev_priv->regfile.savePP_CONTROL);
	I915_WRITE(RSTDBYCTL,
	dev_priv->regfile.saveMCHBAR_RENDER_STANDBY);
	} else {
	I915_WRITE(PFIT_PGM_RATIOS, dev_priv->regfile.savePFIT_PGM_RATIOS);
	I915_WRITE(BLC_PWM_CTL, dev_priv->regfile.saveBLC_PWM_CTL);
	I915_WRITE(BLC_HIST_CTL, dev_priv->regfile.saveBLC_HIST_CTL);
	I915_WRITE(PP_ON_DELAYS, dev_priv->regfile.savePP_ON_DELAYS);
	I915_WRITE(PP_OFF_DELAYS, dev_priv->regfile.savePP_OFF_DELAYS);
	I915_WRITE(PP_DIVISOR, dev_priv->regfile.savePP_DIVISOR);
	I915_WRITE(PP_CONTROL, dev_priv->regfile.savePP_CONTROL);
	}

	spin_unlock_irqrestore(&dev_priv->backlight.lock, flags);

	/* only restore FBC info on the platform that supports FBC*/
	intel_disable_fbc(dev);
	if (I915_HAS_FBC(dev)) {
	if (HAS_PCH_SPLIT(dev)) {
	I915_WRITE(ILK_DPFC_CB_BASE, dev_priv->regfile.saveDPFC_CB_BASE);
	} else if (IS_GM45(dev)) {
	I915_WRITE(DPFC_CB_BASE, dev_priv->regfile.saveDPFC_CB_BASE);
	} else {
	I915_WRITE(FBC_CFB_BASE, dev_priv->regfile.saveFBC_CFB_BASE);
	I915_WRITE(FBC_LL_BASE, dev_priv->regfile.saveFBC_LL_BASE);
	I915_WRITE(FBC_CONTROL2, dev_priv->regfile.saveFBC_CONTROL2);
	I915_WRITE(FBC_CONTROL, dev_priv->regfile.saveFBC_CONTROL);
	}
	}

	if (!drm_core_check_feature(dev, DRIVER_MODESET))
	i915_restore_vga(dev);
	else
	i915_redisable_vga(dev);
	}

	int i915_save_state(struct drm_device *dev)
	{
	struct drm_i915_private *dev_priv = dev->dev_private;
	int i;

	if (INTEL_INFO(dev)->gen <= 4)
	pci_read_config_byte(dev->pdev, LBB,
	&dev_priv->regfile.saveLBB);

	mutex_lock(&dev->struct_mutex);

	i915_save_display(dev);

	if (!drm_core_check_feature(dev, DRIVER_MODESET)) {
	/* Interrupt state */
	if (HAS_PCH_SPLIT(dev)) {
	dev_priv->regfile.saveDEIER = I915_READ(DEIER);
	dev_priv->regfile.saveDEIMR = I915_READ(DEIMR);
	dev_priv->regfile.saveGTIER = I915_READ(GTIER);
	dev_priv->regfile.saveGTIMR = I915_READ(GTIMR);
	dev_priv->regfile.saveFDI_RXA_IMR = I915_READ(_FDI_RXA_IMR);
	dev_priv->regfile.saveFDI_RXB_IMR = I915_READ(_FDI_RXB_IMR);
	dev_priv->regfile.saveMCHBAR_RENDER_STANDBY =
	I915_READ(RSTDBYCTL);
	dev_priv->regfile.savePCH_PORT_HOTPLUG = I915_READ(PCH_PORT_HOTPLUG);
	} else {
	dev_priv->regfile.saveIER = I915_READ(IER);
	dev_priv->regfile.saveIMR = I915_READ(IMR);
	}
	}

	intel_disable_gt_powersave(dev);

	/* Cache mode state */
	dev_priv->regfile.saveCACHE_MODE_0 = I915_READ(CACHE_MODE_0);

	/* Memory Arbitration state */
	dev_priv->regfile.saveMI_ARB_STATE = I915_READ(MI_ARB_STATE);

	/* Scratch space */
	for (i = 0; i < 16; i++) {
	dev_priv->regfile.saveSWF0[i] = I915_READ(SWF00 + (i << 2));
	dev_priv->regfile.saveSWF1[i] = I915_READ(SWF10 + (i << 2));
	}
	for (i = 0; i < 3; i++)
	dev_priv->regfile.saveSWF2[i] = I915_READ(SWF30 + (i << 2));

	mutex_unlock(&dev->struct_mutex);

	return 0;
	}

	int i915_restore_state(struct drm_device *dev)
	{
	struct drm_i915_private *dev_priv = dev->dev_private;
	int i;

	if (INTEL_INFO(dev)->gen <= 4)
	pci_write_config_byte(dev->pdev, LBB,
	dev_priv->regfile.saveLBB);

	mutex_lock(&dev->struct_mutex);

	i915_gem_restore_fences(dev);
	i915_restore_display(dev);

	if (!drm_core_check_feature(dev, DRIVER_MODESET)) {
	/* Interrupt state */
	if (HAS_PCH_SPLIT(dev)) {
	I915_WRITE(DEIER, dev_priv->regfile.saveDEIER);
	I915_WRITE(DEIMR, dev_priv->regfile.saveDEIMR);
	I915_WRITE(GTIER, dev_priv->regfile.saveGTIER);
	I915_WRITE(GTIMR, dev_priv->regfile.saveGTIMR);
	I915_WRITE(_FDI_RXA_IMR, dev_priv->regfile.saveFDI_RXA_IMR);
	I915_WRITE(_FDI_RXB_IMR, dev_priv->regfile.saveFDI_RXB_IMR);
	I915_WRITE(PCH_PORT_HOTPLUG, dev_priv->regfile.savePCH_PORT_HOTPLUG);
	} else {
	I915_WRITE(IER, dev_priv->regfile.saveIER);
	I915_WRITE(IMR, dev_priv->regfile.saveIMR);
	}
	}

	/* Cache mode state */
	I915_WRITE(CACHE_MODE_0, dev_priv->regfile.saveCACHE_MODE_0 \| 0xffff0000);

	/* Memory arbitration state */
	I915_WRITE(MI_ARB_STATE, dev_priv->regfile.saveMI_ARB_STATE \| 0xffff0000);

	for (i = 0; i < 16; i++) {
	I915_WRITE(SWF00 + (i << 2), dev_priv->regfile.saveSWF0[i]);
	I915_WRITE(SWF10 + (i << 2), dev_priv->regfile.saveSWF1[i]);
	}
	for (i = 0; i < 3; i++)
	I915_WRITE(SWF30 + (i << 2), dev_priv->regfile.saveSWF2[i]);

	mutex_unlock(&dev->struct_mutex);

	intel_i2c_reset(dev);

	return 0;
	}