drivers/gpu/drm/i915/i915_suspend.c

   1 /*
   2  *
   3  * Copyright 2008 (c) Intel Corporation
   4  *   Jesse Barnes <jbarnes@virtuousgeek.org>
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  */
  26
  27 #include <drm/drmP.h>
  28 #include <drm/i915_drm.h>
  29 #include "intel_drv.h"
  30 #include "i915_reg.h"
  31
  32 static void i915_save_display(struct drm_i915_private *dev_priv)
  33 {
  34         /* Display arbitration control */
  35         if (INTEL_GEN(dev_priv) <= 4)
  36                 dev_priv->regfile.saveDSPARB = I915_READ(DSPARB);
  37
  38         /* save FBC interval */
  39         if (HAS_FBC(dev_priv) && INTEL_GEN(dev_priv) <= 4 && !IS_G4X(dev_priv))
  40                 dev_priv->regfile.saveFBC_CONTROL = I915_READ(FBC_CONTROL);
  41 }
  42
  43 static void i915_restore_display(struct drm_i915_private *dev_priv)
  44 {
  45         /* Display arbitration */
  46         if (INTEL_GEN(dev_priv) <= 4)
  47                 I915_WRITE(DSPARB, dev_priv->regfile.saveDSPARB);
  48
  49         /* only restore FBC info on the platform that supports FBC*/
  50         intel_fbc_global_disable(dev_priv);
  51
  52         /* restore FBC interval */
  53         if (HAS_FBC(dev_priv) && INTEL_GEN(dev_priv) <= 4 && !IS_G4X(dev_priv))
  54                 I915_WRITE(FBC_CONTROL, dev_priv->regfile.saveFBC_CONTROL);
  55
  56         i915_redisable_vga(dev_priv);
  57 }
  58
  59 int i915_save_state(struct drm_i915_private *dev_priv)
  60 {
  61         struct pci_dev *pdev = dev_priv->drm.pdev;
  62         int i;
  63
  64         mutex_lock(&dev_priv->drm.struct_mutex);
  65
  66         i915_save_display(dev_priv);
  67
  68         if (IS_GEN4(dev_priv))
  69                 pci_read_config_word(pdev, GCDGMBUS,
  70                                      &dev_priv->regfile.saveGCDGMBUS);
  71
  72         /* Cache mode state */
  73         if (INTEL_GEN(dev_priv) < 7)
  74                 dev_priv->regfile.saveCACHE_MODE_0 = I915_READ(CACHE_MODE_0);
  75
  76         /* Memory Arbitration state */
  77         dev_priv->regfile.saveMI_ARB_STATE = I915_READ(MI_ARB_STATE);
  78
  79         /* Scratch space */
  80         if (IS_GEN2(dev_priv) && IS_MOBILE(dev_priv)) {
  81                 for (i = 0; i < 7; i++) {
  82                         dev_priv->regfile.saveSWF0[i] = I915_READ(SWF0(i));
  83                         dev_priv->regfile.saveSWF1[i] = I915_READ(SWF1(i));
  84                 }
  85                 for (i = 0; i < 3; i++)
  86                         dev_priv->regfile.saveSWF3[i] = I915_READ(SWF3(i));
  87         } else if (IS_GEN2(dev_priv)) {
  88                 for (i = 0; i < 7; i++)
  89                         dev_priv->regfile.saveSWF1[i] = I915_READ(SWF1(i));
  90         } else if (HAS_GMCH_DISPLAY(dev_priv)) {
  91                 for (i = 0; i < 16; i++) {
  92                         dev_priv->regfile.saveSWF0[i] = I915_READ(SWF0(i));
  93                         dev_priv->regfile.saveSWF1[i] = I915_READ(SWF1(i));
  94                 }
  95                 for (i = 0; i < 3; i++)
  96                         dev_priv->regfile.saveSWF3[i] = I915_READ(SWF3(i));
  97         }
  98
  99         mutex_unlock(&dev_priv->drm.struct_mutex);
 100
 101         return 0;
 102 }
 103
 104 int i915_restore_state(struct drm_i915_private *dev_priv)
 105 {
 106         struct pci_dev *pdev = dev_priv->drm.pdev;
 107         int i;
 108
 109         mutex_lock(&dev_priv->drm.struct_mutex);
 110
 111         if (IS_GEN4(dev_priv))
 112                 pci_write_config_word(pdev, GCDGMBUS,
 113                                       dev_priv->regfile.saveGCDGMBUS);
 114         i915_restore_display(dev_priv);
 115
 116         /* Cache mode state */
 117         if (INTEL_GEN(dev_priv) < 7)
 118                 I915_WRITE(CACHE_MODE_0, dev_priv->regfile.saveCACHE_MODE_0 |
 119                            0xffff0000);
 120
 121         /* Memory arbitration state */
 122         I915_WRITE(MI_ARB_STATE, dev_priv->regfile.saveMI_ARB_STATE | 0xffff0000);
 123
 124         /* Scratch space */
 125         if (IS_GEN2(dev_priv) && IS_MOBILE(dev_priv)) {
 126                 for (i = 0; i < 7; i++) {
 127                         I915_WRITE(SWF0(i), dev_priv->regfile.saveSWF0[i]);
 128                         I915_WRITE(SWF1(i), dev_priv->regfile.saveSWF1[i]);
 129                 }
 130                 for (i = 0; i < 3; i++)
 131                         I915_WRITE(SWF3(i), dev_priv->regfile.saveSWF3[i]);
 132         } else if (IS_GEN2(dev_priv)) {
 133                 for (i = 0; i < 7; i++)
 134                         I915_WRITE(SWF1(i), dev_priv->regfile.saveSWF1[i]);
 135         } else if (HAS_GMCH_DISPLAY(dev_priv)) {
 136                 for (i = 0; i < 16; i++) {
 137                         I915_WRITE(SWF0(i), dev_priv->regfile.saveSWF0[i]);
 138                         I915_WRITE(SWF1(i), dev_priv->regfile.saveSWF1[i]);
 139                 }
 140                 for (i = 0; i < 3; i++)
 141                         I915_WRITE(SWF3(i), dev_priv->regfile.saveSWF3[i]);
 142         }
 143
 144         mutex_unlock(&dev_priv->drm.struct_mutex);
 145
 146         intel_i2c_reset(dev_priv);
 147
 148         return 0;
 149 }