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 i915_save_display(struct drm_i915_private *dev_priv)
  36 {
  37         struct pci_dev *pdev = dev_priv->drm.pdev;
  38
  39         /* Display arbitration control */
  40         if (INTEL_GEN(dev_priv) <= 4)
  41                 dev_priv->regfile.saveDSPARB = I915_READ(DSPARB);
  42
  43         if (IS_GEN(dev_priv, 4))
  44                 pci_read_config_word(pdev, GCDGMBUS,
  45                                      &dev_priv->regfile.saveGCDGMBUS);
  46 }
  47
  48 static void i915_restore_display(struct drm_i915_private *dev_priv)
  49 {
  50         struct pci_dev *pdev = dev_priv->drm.pdev;
  51
  52         if (IS_GEN(dev_priv, 4))
  53                 pci_write_config_word(pdev, GCDGMBUS,
  54                                       dev_priv->regfile.saveGCDGMBUS);
  55
  56         /* Display arbitration */
  57         if (INTEL_GEN(dev_priv) <= 4)
  58                 I915_WRITE(DSPARB, dev_priv->regfile.saveDSPARB);
  59
  60         /* only restore FBC info on the platform that supports FBC*/
  61         intel_fbc_global_disable(dev_priv);
  62
  63         intel_vga_redisable(dev_priv);
  64
  65         intel_gmbus_reset(dev_priv);
  66 }
  67
  68 int i915_save_state(struct drm_i915_private *dev_priv)
  69 {
  70         int i;
  71
  72         i915_save_display(dev_priv);
  73
  74         /* Scratch space */
  75         if (IS_GEN(dev_priv, 2) && IS_MOBILE(dev_priv)) {
  76                 for (i = 0; i < 7; i++) {
  77                         dev_priv->regfile.saveSWF0[i] = I915_READ(SWF0(i));
  78                         dev_priv->regfile.saveSWF1[i] = I915_READ(SWF1(i));
  79                 }
  80                 for (i = 0; i < 3; i++)
  81                         dev_priv->regfile.saveSWF3[i] = I915_READ(SWF3(i));
  82         } else if (IS_GEN(dev_priv, 2)) {
  83                 for (i = 0; i < 7; i++)
  84                         dev_priv->regfile.saveSWF1[i] = I915_READ(SWF1(i));
  85         } else if (HAS_GMCH(dev_priv)) {
  86                 for (i = 0; i < 16; i++) {
  87                         dev_priv->regfile.saveSWF0[i] = I915_READ(SWF0(i));
  88                         dev_priv->regfile.saveSWF1[i] = I915_READ(SWF1(i));
  89                 }
  90                 for (i = 0; i < 3; i++)
  91                         dev_priv->regfile.saveSWF3[i] = I915_READ(SWF3(i));
  92         }
  93
  94         return 0;
  95 }
  96
  97 int i915_restore_state(struct drm_i915_private *dev_priv)
  98 {
  99         int i;
 100
 101         i915_restore_display(dev_priv);
 102
 103         /* Scratch space */
 104         if (IS_GEN(dev_priv, 2) && IS_MOBILE(dev_priv)) {
 105                 for (i = 0; i < 7; i++) {
 106                         I915_WRITE(SWF0(i), dev_priv->regfile.saveSWF0[i]);
 107                         I915_WRITE(SWF1(i), dev_priv->regfile.saveSWF1[i]);
 108                 }
 109                 for (i = 0; i < 3; i++)
 110                         I915_WRITE(SWF3(i), dev_priv->regfile.saveSWF3[i]);
 111         } else if (IS_GEN(dev_priv, 2)) {
 112                 for (i = 0; i < 7; i++)
 113                         I915_WRITE(SWF1(i), dev_priv->regfile.saveSWF1[i]);
 114         } else if (HAS_GMCH(dev_priv)) {
 115                 for (i = 0; i < 16; i++) {
 116                         I915_WRITE(SWF0(i), dev_priv->regfile.saveSWF0[i]);
 117                         I915_WRITE(SWF1(i), dev_priv->regfile.saveSWF1[i]);
 118                 }
 119                 for (i = 0; i < 3; i++)
 120                         I915_WRITE(SWF3(i), dev_priv->regfile.saveSWF3[i]);
 121         }
 122
 123         return 0;
 124 }