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_de.h"
  28 #include "display/intel_fbc.h"
  29 #include "display/intel_gmbus.h"
  30 #include "display/intel_vga.h"
  31
  32 #include "i915_drv.h"
  33 #include "i915_reg.h"
  34 #include "i915_suspend.h"
  35
  36 static void intel_save_swf(struct drm_i915_private *dev_priv)
  37 {
  38         int i;
  39
  40         /* Scratch space */
  41         if (IS_GEN(dev_priv, 2) && IS_MOBILE(dev_priv)) {
  42                 for (i = 0; i < 7; i++) {
  43                         dev_priv->regfile.saveSWF0[i] = intel_de_read(dev_priv, SWF0(i));
  44                         dev_priv->regfile.saveSWF1[i] = intel_de_read(dev_priv, SWF1(i));
  45                 }
  46                 for (i = 0; i < 3; i++)
  47                         dev_priv->regfile.saveSWF3[i] = intel_de_read(dev_priv, SWF3(i));
  48         } else if (IS_GEN(dev_priv, 2)) {
  49                 for (i = 0; i < 7; i++)
  50                         dev_priv->regfile.saveSWF1[i] = intel_de_read(dev_priv, SWF1(i));
  51         } else if (HAS_GMCH(dev_priv)) {
  52                 for (i = 0; i < 16; i++) {
  53                         dev_priv->regfile.saveSWF0[i] = intel_de_read(dev_priv, SWF0(i));
  54                         dev_priv->regfile.saveSWF1[i] = intel_de_read(dev_priv, SWF1(i));
  55                 }
  56                 for (i = 0; i < 3; i++)
  57                         dev_priv->regfile.saveSWF3[i] = intel_de_read(dev_priv, SWF3(i));
  58         }
  59 }
  60
  61 static void intel_restore_swf(struct drm_i915_private *dev_priv)
  62 {
  63         int i;
  64
  65         /* Scratch space */
  66         if (IS_GEN(dev_priv, 2) && IS_MOBILE(dev_priv)) {
  67                 for (i = 0; i < 7; i++) {
  68                         intel_de_write(dev_priv, SWF0(i), dev_priv->regfile.saveSWF0[i]);
  69                         intel_de_write(dev_priv, SWF1(i), dev_priv->regfile.saveSWF1[i]);
  70                 }
  71                 for (i = 0; i < 3; i++)
  72                         intel_de_write(dev_priv, SWF3(i), dev_priv->regfile.saveSWF3[i]);
  73         } else if (IS_GEN(dev_priv, 2)) {
  74                 for (i = 0; i < 7; i++)
  75                         intel_de_write(dev_priv, SWF1(i), dev_priv->regfile.saveSWF1[i]);
  76         } else if (HAS_GMCH(dev_priv)) {
  77                 for (i = 0; i < 16; i++) {
  78                         intel_de_write(dev_priv, SWF0(i), dev_priv->regfile.saveSWF0[i]);
  79                         intel_de_write(dev_priv, SWF1(i), dev_priv->regfile.saveSWF1[i]);
  80                 }
  81                 for (i = 0; i < 3; i++)
  82                         intel_de_write(dev_priv, SWF3(i), dev_priv->regfile.saveSWF3[i]);
  83         }
  84 }
  85
  86 void i915_save_display(struct drm_i915_private *dev_priv)
  87 {
  88         struct pci_dev *pdev = to_pci_dev(dev_priv->drm.dev);
  89
  90         /* Display arbitration control */
  91         if (INTEL_GEN(dev_priv) <= 4)
  92                 dev_priv->regfile.saveDSPARB = intel_de_read(dev_priv, DSPARB);
  93
  94         if (IS_GEN(dev_priv, 4))
  95                 pci_read_config_word(pdev, GCDGMBUS,
  96                                      &dev_priv->regfile.saveGCDGMBUS);
  97
  98         intel_save_swf(dev_priv);
  99 }
 100
 101 void i915_restore_display(struct drm_i915_private *dev_priv)
 102 {
 103         struct pci_dev *pdev = to_pci_dev(dev_priv->drm.dev);
 104
 105         intel_restore_swf(dev_priv);
 106
 107         if (IS_GEN(dev_priv, 4))
 108                 pci_write_config_word(pdev, GCDGMBUS,
 109                                       dev_priv->regfile.saveGCDGMBUS);
 110
 111         /* Display arbitration */
 112         if (INTEL_GEN(dev_priv) <= 4)
 113                 intel_de_write(dev_priv, DSPARB, dev_priv->regfile.saveDSPARB);
 114
 115         /* only restore FBC info on the platform that supports FBC*/
 116         intel_fbc_global_disable(dev_priv);
 117
 118         intel_vga_redisable(dev_priv);
 119
 120         intel_gmbus_reset(dev_priv);
 121 }