drivers/gpu/drm/i915/i915_suspend.c - arm/linux-arm64-legacy - Git at Google

 /*
  *
  * 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 "drmP.h"
 #include "drm.h"
 #include "i915_drm.h"
 #include "i915_drv.h"

 static bool i915_pipe_enabled(struct drm_device *dev, enum pipe pipe)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;

 	if (pipe == PIPE_A)
 		return (I915_READ(DPLL_A) & DPLL_VCO_ENABLE);
 	else
 		return (I915_READ(DPLL_B) & DPLL_VCO_ENABLE);
 }

 static void i915_save_palette(struct drm_device *dev, enum pipe pipe)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	unsigned long reg = (pipe == PIPE_A ? PALETTE_A : PALETTE_B);
 	u32 *array;
 	int i;

 	if (!i915_pipe_enabled(dev, pipe))
 		return;

 	if (pipe == PIPE_A)
 		array = dev_priv->save_palette_a;
 	else
 		array = dev_priv->save_palette_b;

 	for(i = 0; i < 256; i++)
 		array[i] = I915_READ(reg + (i << 2));
 }

 static void i915_restore_palette(struct drm_device *dev, enum pipe pipe)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	unsigned long reg = (pipe == PIPE_A ? PALETTE_A : PALETTE_B);
 	u32 *array;
 	int i;

 	if (!i915_pipe_enabled(dev, pipe))
 		return;

 	if (pipe == PIPE_A)
 		array = dev_priv->save_palette_a;
 	else
 		array = dev_priv->save_palette_b;

 	for(i = 0; i < 256; i++)
 		I915_WRITE(reg + (i << 2), array[i]);
 }

 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 color palette registers */
 	dev_priv->saveDACMASK = I915_READ8(VGA_DACMASK);
 	/* DACCRX automatically increments during read */
 	I915_WRITE8(VGA_DACRX, 0);
 	/* Read 3 bytes of color data from each index */
 	for (i = 0; i < 256 * 3; i++)
 		dev_priv->saveDACDATA[i] = I915_READ8(VGA_DACDATA);

 	/* MSR bits */
 	dev_priv->saveMSR = I915_READ8(VGA_MSR_READ);
 	if (dev_priv->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->saveCR[i] =
 			i915_read_indexed(dev, cr_index, cr_data, i);
 	/* Make sure we don't turn off CR group 0 writes */
 	dev_priv->saveCR[0x11] &= ~0x80;

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

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

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

 	/* Sequencer registers */
 	for (i = 0; i < 8; i++)
 		dev_priv->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;

 	/* MSR bits */
 	I915_WRITE8(VGA_MSR_WRITE, dev_priv->saveMSR);
 	if (dev_priv->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->saveSR[i]);

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

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

 	i915_write_indexed(dev, VGA_GR_INDEX, VGA_GR_DATA, 0x10,
 			   dev_priv->saveGR[0x10]);
 	i915_write_indexed(dev, VGA_GR_INDEX, VGA_GR_DATA, 0x11,
 			   dev_priv->saveGR[0x11]);
 	i915_write_indexed(dev, VGA_GR_INDEX, VGA_GR_DATA, 0x18,
 			   dev_priv->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->saveAR[i], 0);
 	I915_READ8(st01); /* switch back to index mode */
 	I915_WRITE8(VGA_AR_INDEX, dev_priv->saveAR_INDEX | 0x20);
 	I915_READ8(st01);

 	/* VGA color palette registers */
 	I915_WRITE8(VGA_DACMASK, dev_priv->saveDACMASK);
 	/* DACCRX automatically increments during read */
 	I915_WRITE8(VGA_DACWX, 0);
 	/* Read 3 bytes of color data from each index */
 	for (i = 0; i < 256 * 3; i++)
 		I915_WRITE8(VGA_DACDATA, dev_priv->saveDACDATA[i]);

 }

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

 	pci_read_config_byte(dev->pdev, LBB, &dev_priv->saveLBB);

 	/* Display arbitration control */
 	dev_priv->saveDSPARB = I915_READ(DSPARB);

 	/* Pipe & plane A info */
 	dev_priv->savePIPEACONF = I915_READ(PIPEACONF);
 	dev_priv->savePIPEASRC = I915_READ(PIPEASRC);
 	dev_priv->saveFPA0 = I915_READ(FPA0);
 	dev_priv->saveFPA1 = I915_READ(FPA1);
 	dev_priv->saveDPLL_A = I915_READ(DPLL_A);
 	if (IS_I965G(dev))
 		dev_priv->saveDPLL_A_MD = I915_READ(DPLL_A_MD);
 	dev_priv->saveHTOTAL_A = I915_READ(HTOTAL_A);
 	dev_priv->saveHBLANK_A = I915_READ(HBLANK_A);
 	dev_priv->saveHSYNC_A = I915_READ(HSYNC_A);
 	dev_priv->saveVTOTAL_A = I915_READ(VTOTAL_A);
 	dev_priv->saveVBLANK_A = I915_READ(VBLANK_A);
 	dev_priv->saveVSYNC_A = I915_READ(VSYNC_A);
 	dev_priv->saveBCLRPAT_A = I915_READ(BCLRPAT_A);

 	dev_priv->saveDSPACNTR = I915_READ(DSPACNTR);
 	dev_priv->saveDSPASTRIDE = I915_READ(DSPASTRIDE);
 	dev_priv->saveDSPASIZE = I915_READ(DSPASIZE);
 	dev_priv->saveDSPAPOS = I915_READ(DSPAPOS);
 	dev_priv->saveDSPAADDR = I915_READ(DSPAADDR);
 	if (IS_I965G(dev)) {
 		dev_priv->saveDSPASURF = I915_READ(DSPASURF);
 		dev_priv->saveDSPATILEOFF = I915_READ(DSPATILEOFF);
 	}
 	i915_save_palette(dev, PIPE_A);
 	dev_priv->savePIPEASTAT = I915_READ(PIPEASTAT);

 	/* Pipe & plane B info */
 	dev_priv->savePIPEBCONF = I915_READ(PIPEBCONF);
 	dev_priv->savePIPEBSRC = I915_READ(PIPEBSRC);
 	dev_priv->saveFPB0 = I915_READ(FPB0);
 	dev_priv->saveFPB1 = I915_READ(FPB1);
 	dev_priv->saveDPLL_B = I915_READ(DPLL_B);
 	if (IS_I965G(dev))
 		dev_priv->saveDPLL_B_MD = I915_READ(DPLL_B_MD);
 	dev_priv->saveHTOTAL_B = I915_READ(HTOTAL_B);
 	dev_priv->saveHBLANK_B = I915_READ(HBLANK_B);
 	dev_priv->saveHSYNC_B = I915_READ(HSYNC_B);
 	dev_priv->saveVTOTAL_B = I915_READ(VTOTAL_B);
 	dev_priv->saveVBLANK_B = I915_READ(VBLANK_B);
 	dev_priv->saveVSYNC_B = I915_READ(VSYNC_B);
 	dev_priv->saveBCLRPAT_A = I915_READ(BCLRPAT_A);

 	dev_priv->saveDSPBCNTR = I915_READ(DSPBCNTR);
 	dev_priv->saveDSPBSTRIDE = I915_READ(DSPBSTRIDE);
 	dev_priv->saveDSPBSIZE = I915_READ(DSPBSIZE);
 	dev_priv->saveDSPBPOS = I915_READ(DSPBPOS);
 	dev_priv->saveDSPBADDR = I915_READ(DSPBADDR);
 	if (IS_I965GM(dev) || IS_GM45(dev)) {
 		dev_priv->saveDSPBSURF = I915_READ(DSPBSURF);
 		dev_priv->saveDSPBTILEOFF = I915_READ(DSPBTILEOFF);
 	}
 	i915_save_palette(dev, PIPE_B);
 	dev_priv->savePIPEBSTAT = I915_READ(PIPEBSTAT);

 	/* CRT state */
 	dev_priv->saveADPA = I915_READ(ADPA);

 	/* LVDS state */
 	dev_priv->savePP_CONTROL = I915_READ(PP_CONTROL);
 	dev_priv->savePFIT_PGM_RATIOS = I915_READ(PFIT_PGM_RATIOS);
 	dev_priv->saveBLC_PWM_CTL = I915_READ(BLC_PWM_CTL);
 	if (IS_I965G(dev))
 		dev_priv->saveBLC_PWM_CTL2 = I915_READ(BLC_PWM_CTL2);
 	if (IS_MOBILE(dev) && !IS_I830(dev))
 		dev_priv->saveLVDS = I915_READ(LVDS);
 	if (!IS_I830(dev) && !IS_845G(dev))
 		dev_priv->savePFIT_CONTROL = I915_READ(PFIT_CONTROL);
 	dev_priv->savePP_ON_DELAYS = I915_READ(PP_ON_DELAYS);
 	dev_priv->savePP_OFF_DELAYS = I915_READ(PP_OFF_DELAYS);
 	dev_priv->savePP_DIVISOR = I915_READ(PP_DIVISOR);

 	/* FIXME: save TV & SDVO state */

 	/* FBC state */
 	dev_priv->saveFBC_CFB_BASE = I915_READ(FBC_CFB_BASE);
 	dev_priv->saveFBC_LL_BASE = I915_READ(FBC_LL_BASE);
 	dev_priv->saveFBC_CONTROL2 = I915_READ(FBC_CONTROL2);
 	dev_priv->saveFBC_CONTROL = I915_READ(FBC_CONTROL);

 	/* Interrupt state */
 	dev_priv->saveIIR = I915_READ(IIR);
 	dev_priv->saveIER = I915_READ(IER);
 	dev_priv->saveIMR = I915_READ(IMR);

 	/* VGA state */
 	dev_priv->saveVGA0 = I915_READ(VGA0);
 	dev_priv->saveVGA1 = I915_READ(VGA1);
 	dev_priv->saveVGA_PD = I915_READ(VGA_PD);
 	dev_priv->saveVGACNTRL = I915_READ(VGACNTRL);

 	/* Clock gating state */
 	dev_priv->saveD_STATE = I915_READ(D_STATE);
 	dev_priv->saveCG_2D_DIS = I915_READ(CG_2D_DIS);

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

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

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

 	i915_save_vga(dev);

 	return 0;
 }

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

 	pci_write_config_byte(dev->pdev, LBB, dev_priv->saveLBB);

 	I915_WRITE(DSPARB, dev_priv->saveDSPARB);

 	/* Pipe & plane A info */
 	/* Prime the clock */
 	if (dev_priv->saveDPLL_A & DPLL_VCO_ENABLE) {
 		I915_WRITE(DPLL_A, dev_priv->saveDPLL_A &
 			   ~DPLL_VCO_ENABLE);
 		DRM_UDELAY(150);
 	}
 	I915_WRITE(FPA0, dev_priv->saveFPA0);
 	I915_WRITE(FPA1, dev_priv->saveFPA1);
 	/* Actually enable it */
 	I915_WRITE(DPLL_A, dev_priv->saveDPLL_A);
 	DRM_UDELAY(150);
 	if (IS_I965G(dev))
 		I915_WRITE(DPLL_A_MD, dev_priv->saveDPLL_A_MD);
 	DRM_UDELAY(150);

 	/* Restore mode */
 	I915_WRITE(HTOTAL_A, dev_priv->saveHTOTAL_A);
 	I915_WRITE(HBLANK_A, dev_priv->saveHBLANK_A);
 	I915_WRITE(HSYNC_A, dev_priv->saveHSYNC_A);
 	I915_WRITE(VTOTAL_A, dev_priv->saveVTOTAL_A);
 	I915_WRITE(VBLANK_A, dev_priv->saveVBLANK_A);
 	I915_WRITE(VSYNC_A, dev_priv->saveVSYNC_A);
 	I915_WRITE(BCLRPAT_A, dev_priv->saveBCLRPAT_A);

 	/* Restore plane info */
 	I915_WRITE(DSPASIZE, dev_priv->saveDSPASIZE);
 	I915_WRITE(DSPAPOS, dev_priv->saveDSPAPOS);
 	I915_WRITE(PIPEASRC, dev_priv->savePIPEASRC);
 	I915_WRITE(DSPAADDR, dev_priv->saveDSPAADDR);
 	I915_WRITE(DSPASTRIDE, dev_priv->saveDSPASTRIDE);
 	if (IS_I965G(dev)) {
 		I915_WRITE(DSPASURF, dev_priv->saveDSPASURF);
 		I915_WRITE(DSPATILEOFF, dev_priv->saveDSPATILEOFF);
 	}

 	I915_WRITE(PIPEACONF, dev_priv->savePIPEACONF);

 	i915_restore_palette(dev, PIPE_A);
 	/* Enable the plane */
 	I915_WRITE(DSPACNTR, dev_priv->saveDSPACNTR);
 	I915_WRITE(DSPAADDR, I915_READ(DSPAADDR));

 	/* Pipe & plane B info */
 	if (dev_priv->saveDPLL_B & DPLL_VCO_ENABLE) {
 		I915_WRITE(DPLL_B, dev_priv->saveDPLL_B &
 			   ~DPLL_VCO_ENABLE);
 		DRM_UDELAY(150);
 	}
 	I915_WRITE(FPB0, dev_priv->saveFPB0);
 	I915_WRITE(FPB1, dev_priv->saveFPB1);
 	/* Actually enable it */
 	I915_WRITE(DPLL_B, dev_priv->saveDPLL_B);
 	DRM_UDELAY(150);
 	if (IS_I965G(dev))
 		I915_WRITE(DPLL_B_MD, dev_priv->saveDPLL_B_MD);
 	DRM_UDELAY(150);

 	/* Restore mode */
 	I915_WRITE(HTOTAL_B, dev_priv->saveHTOTAL_B);
 	I915_WRITE(HBLANK_B, dev_priv->saveHBLANK_B);
 	I915_WRITE(HSYNC_B, dev_priv->saveHSYNC_B);
 	I915_WRITE(VTOTAL_B, dev_priv->saveVTOTAL_B);
 	I915_WRITE(VBLANK_B, dev_priv->saveVBLANK_B);
 	I915_WRITE(VSYNC_B, dev_priv->saveVSYNC_B);
 	I915_WRITE(BCLRPAT_B, dev_priv->saveBCLRPAT_B);

 	/* Restore plane info */
 	I915_WRITE(DSPBSIZE, dev_priv->saveDSPBSIZE);
 	I915_WRITE(DSPBPOS, dev_priv->saveDSPBPOS);
 	I915_WRITE(PIPEBSRC, dev_priv->savePIPEBSRC);
 	I915_WRITE(DSPBADDR, dev_priv->saveDSPBADDR);
 	I915_WRITE(DSPBSTRIDE, dev_priv->saveDSPBSTRIDE);
 	if (IS_I965G(dev)) {
 		I915_WRITE(DSPBSURF, dev_priv->saveDSPBSURF);
 		I915_WRITE(DSPBTILEOFF, dev_priv->saveDSPBTILEOFF);
 	}

 	I915_WRITE(PIPEBCONF, dev_priv->savePIPEBCONF);

 	i915_restore_palette(dev, PIPE_B);
 	/* Enable the plane */
 	I915_WRITE(DSPBCNTR, dev_priv->saveDSPBCNTR);
 	I915_WRITE(DSPBADDR, I915_READ(DSPBADDR));

 	/* CRT state */
 	I915_WRITE(ADPA, dev_priv->saveADPA);

 	/* LVDS state */
 	if (IS_I965G(dev))
 		I915_WRITE(BLC_PWM_CTL2, dev_priv->saveBLC_PWM_CTL2);
 	if (IS_MOBILE(dev) && !IS_I830(dev))
 		I915_WRITE(LVDS, dev_priv->saveLVDS);
 	if (!IS_I830(dev) && !IS_845G(dev))
 		I915_WRITE(PFIT_CONTROL, dev_priv->savePFIT_CONTROL);

 	I915_WRITE(PFIT_PGM_RATIOS, dev_priv->savePFIT_PGM_RATIOS);
 	I915_WRITE(BLC_PWM_CTL, dev_priv->saveBLC_PWM_CTL);
 	I915_WRITE(PP_ON_DELAYS, dev_priv->savePP_ON_DELAYS);
 	I915_WRITE(PP_OFF_DELAYS, dev_priv->savePP_OFF_DELAYS);
 	I915_WRITE(PP_DIVISOR, dev_priv->savePP_DIVISOR);
 	I915_WRITE(PP_CONTROL, dev_priv->savePP_CONTROL);

 	/* FIXME: restore TV & SDVO state */

 	/* FBC info */
 	I915_WRITE(FBC_CFB_BASE, dev_priv->saveFBC_CFB_BASE);
 	I915_WRITE(FBC_LL_BASE, dev_priv->saveFBC_LL_BASE);
 	I915_WRITE(FBC_CONTROL2, dev_priv->saveFBC_CONTROL2);
 	I915_WRITE(FBC_CONTROL, dev_priv->saveFBC_CONTROL);

 	/* VGA state */
 	I915_WRITE(VGACNTRL, dev_priv->saveVGACNTRL);
 	I915_WRITE(VGA0, dev_priv->saveVGA0);
 	I915_WRITE(VGA1, dev_priv->saveVGA1);
 	I915_WRITE(VGA_PD, dev_priv->saveVGA_PD);
 	DRM_UDELAY(150);

 	/* Clock gating state */
 	I915_WRITE (D_STATE, dev_priv->saveD_STATE);
 	I915_WRITE (CG_2D_DIS, dev_priv->saveCG_2D_DIS);

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

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

 	for (i = 0; i < 16; i++) {
 		I915_WRITE(SWF00 + (i << 2), dev_priv->saveSWF0[i]);
 		I915_WRITE(SWF10 + (i << 2), dev_priv->saveSWF1[i+7]);
 	}
 	for (i = 0; i < 3; i++)
 		I915_WRITE(SWF30 + (i << 2), dev_priv->saveSWF2[i]);

 	i915_restore_vga(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 "drmP.h"
	#include "drm.h"
	#include "i915_drm.h"
	#include "i915_drv.h"

	static bool i915_pipe_enabled(struct drm_device *dev, enum pipe pipe)
	{
	struct drm_i915_private *dev_priv = dev->dev_private;

	if (pipe == PIPE_A)
	return (I915_READ(DPLL_A) & DPLL_VCO_ENABLE);
	else
	return (I915_READ(DPLL_B) & DPLL_VCO_ENABLE);
	}

	static void i915_save_palette(struct drm_device *dev, enum pipe pipe)
	{
	struct drm_i915_private *dev_priv = dev->dev_private;
	unsigned long reg = (pipe == PIPE_A ? PALETTE_A : PALETTE_B);
	u32 *array;
	int i;

	if (!i915_pipe_enabled(dev, pipe))
	return;

	if (pipe == PIPE_A)
	array = dev_priv->save_palette_a;
	else
	array = dev_priv->save_palette_b;

	for(i = 0; i < 256; i++)
	array[i] = I915_READ(reg + (i << 2));
	}

	static void i915_restore_palette(struct drm_device *dev, enum pipe pipe)
	{
	struct drm_i915_private *dev_priv = dev->dev_private;
	unsigned long reg = (pipe == PIPE_A ? PALETTE_A : PALETTE_B);
	u32 *array;
	int i;

	if (!i915_pipe_enabled(dev, pipe))
	return;

	if (pipe == PIPE_A)
	array = dev_priv->save_palette_a;
	else
	array = dev_priv->save_palette_b;

	for(i = 0; i < 256; i++)
	I915_WRITE(reg + (i << 2), array[i]);
	}

	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 color palette registers */
	dev_priv->saveDACMASK = I915_READ8(VGA_DACMASK);
	/* DACCRX automatically increments during read */
	I915_WRITE8(VGA_DACRX, 0);
	/* Read 3 bytes of color data from each index */
	for (i = 0; i < 256 * 3; i++)
	dev_priv->saveDACDATA[i] = I915_READ8(VGA_DACDATA);

	/* MSR bits */
	dev_priv->saveMSR = I915_READ8(VGA_MSR_READ);
	if (dev_priv->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->saveCR[i] =
	i915_read_indexed(dev, cr_index, cr_data, i);
	/* Make sure we don't turn off CR group 0 writes */
	dev_priv->saveCR[0x11] &= ~0x80;

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

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

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

	/* Sequencer registers */
	for (i = 0; i < 8; i++)
	dev_priv->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;

	/* MSR bits */
	I915_WRITE8(VGA_MSR_WRITE, dev_priv->saveMSR);
	if (dev_priv->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->saveSR[i]);

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

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

	i915_write_indexed(dev, VGA_GR_INDEX, VGA_GR_DATA, 0x10,
	dev_priv->saveGR[0x10]);
	i915_write_indexed(dev, VGA_GR_INDEX, VGA_GR_DATA, 0x11,
	dev_priv->saveGR[0x11]);
	i915_write_indexed(dev, VGA_GR_INDEX, VGA_GR_DATA, 0x18,
	dev_priv->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->saveAR[i], 0);
	I915_READ8(st01); /* switch back to index mode */
	I915_WRITE8(VGA_AR_INDEX, dev_priv->saveAR_INDEX \| 0x20);
	I915_READ8(st01);

	/* VGA color palette registers */
	I915_WRITE8(VGA_DACMASK, dev_priv->saveDACMASK);
	/* DACCRX automatically increments during read */
	I915_WRITE8(VGA_DACWX, 0);
	/* Read 3 bytes of color data from each index */
	for (i = 0; i < 256 * 3; i++)
	I915_WRITE8(VGA_DACDATA, dev_priv->saveDACDATA[i]);

	}

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

	pci_read_config_byte(dev->pdev, LBB, &dev_priv->saveLBB);

	/* Display arbitration control */
	dev_priv->saveDSPARB = I915_READ(DSPARB);

	/* Pipe & plane A info */
	dev_priv->savePIPEACONF = I915_READ(PIPEACONF);
	dev_priv->savePIPEASRC = I915_READ(PIPEASRC);
	dev_priv->saveFPA0 = I915_READ(FPA0);
	dev_priv->saveFPA1 = I915_READ(FPA1);
	dev_priv->saveDPLL_A = I915_READ(DPLL_A);
	if (IS_I965G(dev))
	dev_priv->saveDPLL_A_MD = I915_READ(DPLL_A_MD);
	dev_priv->saveHTOTAL_A = I915_READ(HTOTAL_A);
	dev_priv->saveHBLANK_A = I915_READ(HBLANK_A);
	dev_priv->saveHSYNC_A = I915_READ(HSYNC_A);
	dev_priv->saveVTOTAL_A = I915_READ(VTOTAL_A);
	dev_priv->saveVBLANK_A = I915_READ(VBLANK_A);
	dev_priv->saveVSYNC_A = I915_READ(VSYNC_A);
	dev_priv->saveBCLRPAT_A = I915_READ(BCLRPAT_A);

	dev_priv->saveDSPACNTR = I915_READ(DSPACNTR);
	dev_priv->saveDSPASTRIDE = I915_READ(DSPASTRIDE);
	dev_priv->saveDSPASIZE = I915_READ(DSPASIZE);
	dev_priv->saveDSPAPOS = I915_READ(DSPAPOS);
	dev_priv->saveDSPAADDR = I915_READ(DSPAADDR);
	if (IS_I965G(dev)) {
	dev_priv->saveDSPASURF = I915_READ(DSPASURF);
	dev_priv->saveDSPATILEOFF = I915_READ(DSPATILEOFF);
	}
	i915_save_palette(dev, PIPE_A);
	dev_priv->savePIPEASTAT = I915_READ(PIPEASTAT);

	/* Pipe & plane B info */
	dev_priv->savePIPEBCONF = I915_READ(PIPEBCONF);
	dev_priv->savePIPEBSRC = I915_READ(PIPEBSRC);
	dev_priv->saveFPB0 = I915_READ(FPB0);
	dev_priv->saveFPB1 = I915_READ(FPB1);
	dev_priv->saveDPLL_B = I915_READ(DPLL_B);
	if (IS_I965G(dev))
	dev_priv->saveDPLL_B_MD = I915_READ(DPLL_B_MD);
	dev_priv->saveHTOTAL_B = I915_READ(HTOTAL_B);
	dev_priv->saveHBLANK_B = I915_READ(HBLANK_B);
	dev_priv->saveHSYNC_B = I915_READ(HSYNC_B);
	dev_priv->saveVTOTAL_B = I915_READ(VTOTAL_B);
	dev_priv->saveVBLANK_B = I915_READ(VBLANK_B);
	dev_priv->saveVSYNC_B = I915_READ(VSYNC_B);
	dev_priv->saveBCLRPAT_A = I915_READ(BCLRPAT_A);

	dev_priv->saveDSPBCNTR = I915_READ(DSPBCNTR);
	dev_priv->saveDSPBSTRIDE = I915_READ(DSPBSTRIDE);
	dev_priv->saveDSPBSIZE = I915_READ(DSPBSIZE);
	dev_priv->saveDSPBPOS = I915_READ(DSPBPOS);
	dev_priv->saveDSPBADDR = I915_READ(DSPBADDR);
	if (IS_I965GM(dev) \|\| IS_GM45(dev)) {
	dev_priv->saveDSPBSURF = I915_READ(DSPBSURF);
	dev_priv->saveDSPBTILEOFF = I915_READ(DSPBTILEOFF);
	}
	i915_save_palette(dev, PIPE_B);
	dev_priv->savePIPEBSTAT = I915_READ(PIPEBSTAT);

	/* CRT state */
	dev_priv->saveADPA = I915_READ(ADPA);

	/* LVDS state */
	dev_priv->savePP_CONTROL = I915_READ(PP_CONTROL);
	dev_priv->savePFIT_PGM_RATIOS = I915_READ(PFIT_PGM_RATIOS);
	dev_priv->saveBLC_PWM_CTL = I915_READ(BLC_PWM_CTL);
	if (IS_I965G(dev))
	dev_priv->saveBLC_PWM_CTL2 = I915_READ(BLC_PWM_CTL2);
	if (IS_MOBILE(dev) && !IS_I830(dev))
	dev_priv->saveLVDS = I915_READ(LVDS);
	if (!IS_I830(dev) && !IS_845G(dev))
	dev_priv->savePFIT_CONTROL = I915_READ(PFIT_CONTROL);
	dev_priv->savePP_ON_DELAYS = I915_READ(PP_ON_DELAYS);
	dev_priv->savePP_OFF_DELAYS = I915_READ(PP_OFF_DELAYS);
	dev_priv->savePP_DIVISOR = I915_READ(PP_DIVISOR);

	/* FIXME: save TV & SDVO state */

	/* FBC state */
	dev_priv->saveFBC_CFB_BASE = I915_READ(FBC_CFB_BASE);
	dev_priv->saveFBC_LL_BASE = I915_READ(FBC_LL_BASE);
	dev_priv->saveFBC_CONTROL2 = I915_READ(FBC_CONTROL2);
	dev_priv->saveFBC_CONTROL = I915_READ(FBC_CONTROL);

	/* Interrupt state */
	dev_priv->saveIIR = I915_READ(IIR);
	dev_priv->saveIER = I915_READ(IER);
	dev_priv->saveIMR = I915_READ(IMR);

	/* VGA state */
	dev_priv->saveVGA0 = I915_READ(VGA0);
	dev_priv->saveVGA1 = I915_READ(VGA1);
	dev_priv->saveVGA_PD = I915_READ(VGA_PD);
	dev_priv->saveVGACNTRL = I915_READ(VGACNTRL);

	/* Clock gating state */
	dev_priv->saveD_STATE = I915_READ(D_STATE);
	dev_priv->saveCG_2D_DIS = I915_READ(CG_2D_DIS);

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

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

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

	i915_save_vga(dev);

	return 0;
	}

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

	pci_write_config_byte(dev->pdev, LBB, dev_priv->saveLBB);

	I915_WRITE(DSPARB, dev_priv->saveDSPARB);

	/* Pipe & plane A info */
	/* Prime the clock */
	if (dev_priv->saveDPLL_A & DPLL_VCO_ENABLE) {
	I915_WRITE(DPLL_A, dev_priv->saveDPLL_A &
	~DPLL_VCO_ENABLE);
	DRM_UDELAY(150);
	}
	I915_WRITE(FPA0, dev_priv->saveFPA0);
	I915_WRITE(FPA1, dev_priv->saveFPA1);
	/* Actually enable it */
	I915_WRITE(DPLL_A, dev_priv->saveDPLL_A);
	DRM_UDELAY(150);
	if (IS_I965G(dev))
	I915_WRITE(DPLL_A_MD, dev_priv->saveDPLL_A_MD);
	DRM_UDELAY(150);

	/* Restore mode */
	I915_WRITE(HTOTAL_A, dev_priv->saveHTOTAL_A);
	I915_WRITE(HBLANK_A, dev_priv->saveHBLANK_A);
	I915_WRITE(HSYNC_A, dev_priv->saveHSYNC_A);
	I915_WRITE(VTOTAL_A, dev_priv->saveVTOTAL_A);
	I915_WRITE(VBLANK_A, dev_priv->saveVBLANK_A);
	I915_WRITE(VSYNC_A, dev_priv->saveVSYNC_A);
	I915_WRITE(BCLRPAT_A, dev_priv->saveBCLRPAT_A);

	/* Restore plane info */
	I915_WRITE(DSPASIZE, dev_priv->saveDSPASIZE);
	I915_WRITE(DSPAPOS, dev_priv->saveDSPAPOS);
	I915_WRITE(PIPEASRC, dev_priv->savePIPEASRC);
	I915_WRITE(DSPAADDR, dev_priv->saveDSPAADDR);
	I915_WRITE(DSPASTRIDE, dev_priv->saveDSPASTRIDE);
	if (IS_I965G(dev)) {
	I915_WRITE(DSPASURF, dev_priv->saveDSPASURF);
	I915_WRITE(DSPATILEOFF, dev_priv->saveDSPATILEOFF);
	}

	I915_WRITE(PIPEACONF, dev_priv->savePIPEACONF);

	i915_restore_palette(dev, PIPE_A);
	/* Enable the plane */
	I915_WRITE(DSPACNTR, dev_priv->saveDSPACNTR);
	I915_WRITE(DSPAADDR, I915_READ(DSPAADDR));

	/* Pipe & plane B info */
	if (dev_priv->saveDPLL_B & DPLL_VCO_ENABLE) {
	I915_WRITE(DPLL_B, dev_priv->saveDPLL_B &
	~DPLL_VCO_ENABLE);
	DRM_UDELAY(150);
	}
	I915_WRITE(FPB0, dev_priv->saveFPB0);
	I915_WRITE(FPB1, dev_priv->saveFPB1);
	/* Actually enable it */
	I915_WRITE(DPLL_B, dev_priv->saveDPLL_B);
	DRM_UDELAY(150);
	if (IS_I965G(dev))
	I915_WRITE(DPLL_B_MD, dev_priv->saveDPLL_B_MD);
	DRM_UDELAY(150);

	/* Restore mode */
	I915_WRITE(HTOTAL_B, dev_priv->saveHTOTAL_B);
	I915_WRITE(HBLANK_B, dev_priv->saveHBLANK_B);
	I915_WRITE(HSYNC_B, dev_priv->saveHSYNC_B);
	I915_WRITE(VTOTAL_B, dev_priv->saveVTOTAL_B);
	I915_WRITE(VBLANK_B, dev_priv->saveVBLANK_B);
	I915_WRITE(VSYNC_B, dev_priv->saveVSYNC_B);
	I915_WRITE(BCLRPAT_B, dev_priv->saveBCLRPAT_B);

	/* Restore plane info */
	I915_WRITE(DSPBSIZE, dev_priv->saveDSPBSIZE);
	I915_WRITE(DSPBPOS, dev_priv->saveDSPBPOS);
	I915_WRITE(PIPEBSRC, dev_priv->savePIPEBSRC);
	I915_WRITE(DSPBADDR, dev_priv->saveDSPBADDR);
	I915_WRITE(DSPBSTRIDE, dev_priv->saveDSPBSTRIDE);
	if (IS_I965G(dev)) {
	I915_WRITE(DSPBSURF, dev_priv->saveDSPBSURF);
	I915_WRITE(DSPBTILEOFF, dev_priv->saveDSPBTILEOFF);
	}

	I915_WRITE(PIPEBCONF, dev_priv->savePIPEBCONF);

	i915_restore_palette(dev, PIPE_B);
	/* Enable the plane */
	I915_WRITE(DSPBCNTR, dev_priv->saveDSPBCNTR);
	I915_WRITE(DSPBADDR, I915_READ(DSPBADDR));

	/* CRT state */
	I915_WRITE(ADPA, dev_priv->saveADPA);

	/* LVDS state */
	if (IS_I965G(dev))
	I915_WRITE(BLC_PWM_CTL2, dev_priv->saveBLC_PWM_CTL2);
	if (IS_MOBILE(dev) && !IS_I830(dev))
	I915_WRITE(LVDS, dev_priv->saveLVDS);
	if (!IS_I830(dev) && !IS_845G(dev))
	I915_WRITE(PFIT_CONTROL, dev_priv->savePFIT_CONTROL);

	I915_WRITE(PFIT_PGM_RATIOS, dev_priv->savePFIT_PGM_RATIOS);
	I915_WRITE(BLC_PWM_CTL, dev_priv->saveBLC_PWM_CTL);
	I915_WRITE(PP_ON_DELAYS, dev_priv->savePP_ON_DELAYS);
	I915_WRITE(PP_OFF_DELAYS, dev_priv->savePP_OFF_DELAYS);
	I915_WRITE(PP_DIVISOR, dev_priv->savePP_DIVISOR);
	I915_WRITE(PP_CONTROL, dev_priv->savePP_CONTROL);

	/* FIXME: restore TV & SDVO state */

	/* FBC info */
	I915_WRITE(FBC_CFB_BASE, dev_priv->saveFBC_CFB_BASE);
	I915_WRITE(FBC_LL_BASE, dev_priv->saveFBC_LL_BASE);
	I915_WRITE(FBC_CONTROL2, dev_priv->saveFBC_CONTROL2);
	I915_WRITE(FBC_CONTROL, dev_priv->saveFBC_CONTROL);

	/* VGA state */
	I915_WRITE(VGACNTRL, dev_priv->saveVGACNTRL);
	I915_WRITE(VGA0, dev_priv->saveVGA0);
	I915_WRITE(VGA1, dev_priv->saveVGA1);
	I915_WRITE(VGA_PD, dev_priv->saveVGA_PD);
	DRM_UDELAY(150);

	/* Clock gating state */
	I915_WRITE (D_STATE, dev_priv->saveD_STATE);
	I915_WRITE (CG_2D_DIS, dev_priv->saveCG_2D_DIS);

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

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

	for (i = 0; i < 16; i++) {
	I915_WRITE(SWF00 + (i << 2), dev_priv->saveSWF0[i]);
	I915_WRITE(SWF10 + (i << 2), dev_priv->saveSWF1[i+7]);
	}
	for (i = 0; i < 3; i++)
	I915_WRITE(SWF30 + (i << 2), dev_priv->saveSWF2[i]);

	i915_restore_vga(dev);

	return 0;
	}