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 "display/intel_fbc.h"
  28 #include "display/intel_gmbus.h"
  29 #include "display/intel_vga.h"
  30
  31 #include "i915_drv.h"
  32 #include "i915_reg.h"
  33 #include "i915_suspend.h"
  34
  35 static void intel_save_swf(struct drm_i915_private *dev_priv)
  36 {
  37         int i;
  38
  39         /* Scratch space */
  40         if (IS_GEN(dev_priv, 2) && IS_MOBILE(dev_priv)) {
  41                 for (i = 0; i < 7; i++) {
  42                         dev_priv->regfile.saveSWF0[i] = I915_READ(SWF0(i));
  43                         dev_priv->regfile.saveSWF1[i] = I915_READ(SWF1(i));
  44                 }
  45                 for (i = 0; i < 3; i++)
  46                         dev_priv->regfile.saveSWF3[i] = I915_READ(SWF3(i));
  47         } else if (IS_GEN(dev_priv, 2)) {
  48                 for (i = 0; i < 7; i++)
  49                         dev_priv->regfile.saveSWF1[i] = I915_READ(SWF1(i));
  50         } else if (HAS_GMCH(dev_priv)) {
  51                 for (i = 0; i < 16; i++) {
  52                         dev_priv->regfile.saveSWF0[i] = I915_READ(SWF0(i));
  53                         dev_priv->regfile.saveSWF1[i] = I915_READ(SWF1(i));
  54                 }
  55                 for (i = 0; i < 3; i++)
  56                         dev_priv->regfile.saveSWF3[i] = I915_READ(SWF3(i));
  57         }
  58 }
  59
  60 static void intel_restore_swf(struct drm_i915_private *dev_priv)
  61 {
  62         int i;
  63
  64         /* Scratch space */
  65         if (IS_GEN(dev_priv, 2) && IS_MOBILE(dev_priv)) {
  66                 for (i = 0; i < 7; i++) {
  67                         I915_WRITE(SWF0(i), dev_priv->regfile.saveSWF0[i]);
  68                         I915_WRITE(SWF1(i), dev_priv->regfile.saveSWF1[i]);
  69                 }
  70                 for (i = 0; i < 3; i++)
  71                         I915_WRITE(SWF3(i), dev_priv->regfile.saveSWF3[i]);
  72         } else if (IS_GEN(dev_priv, 2)) {
  73                 for (i = 0; i < 7; i++)
  74                         I915_WRITE(SWF1(i), dev_priv->regfile.saveSWF1[i]);
  75         } else if (HAS_GMCH(dev_priv)) {
  76                 for (i = 0; i < 16; i++) {
  77                         I915_WRITE(SWF0(i), dev_priv->regfile.saveSWF0[i]);
  78                         I915_WRITE(SWF1(i), dev_priv->regfile.saveSWF1[i]);
  79                 }
  80                 for (i = 0; i < 3; i++)
  81                         I915_WRITE(SWF3(i), dev_priv->regfile.saveSWF3[i]);
  82         }
  83 }
  84
  85 void i915_save_display(struct drm_i915_private *dev_priv)
  86 {
  87         struct pci_dev *pdev = dev_priv->drm.pdev;
  88
  89         /* Display arbitration control */
  90         if (INTEL_GEN(dev_priv) <= 4)
  91                 dev_priv->regfile.saveDSPARB = I915_READ(DSPARB);
  92
  93         if (IS_GEN(dev_priv, 4))
  94                 pci_read_config_word(pdev, GCDGMBUS,
  95                                      &dev_priv->regfile.saveGCDGMBUS);
  96
  97         intel_save_swf(dev_priv);
  98 }
  99
 100 void i915_restore_display(struct drm_i915_private *dev_priv)
 101 {
 102         struct pci_dev *pdev = dev_priv->drm.pdev;
 103
 104         intel_restore_swf(dev_priv);
 105
 106         if (IS_GEN(dev_priv, 4))
 107                 pci_write_config_word(pdev, GCDGMBUS,
 108                                       dev_priv->regfile.saveGCDGMBUS);
 109
 110         /* Display arbitration */
 111         if (INTEL_GEN(dev_priv) <= 4)
 112                 I915_WRITE(DSPARB, dev_priv->regfile.saveDSPARB);
 113
 114         /* only restore FBC info on the platform that supports FBC*/
 115         intel_fbc_global_disable(dev_priv);
 116
 117         intel_vga_redisable(dev_priv);
 118
 119         intel_gmbus_reset(dev_priv);
 120 }