Merge tag 'drm-intel-fixes-2014-10-02' of git://anongit.freedesktop.org/drm-intel into drm-fixes

final regression fix for 3.17.

* tag 'drm-intel-fixes-2014-10-02' of git://anongit.freedesktop.org/drm-intel:
  drm/i915: Flush the PTEs after updating them before suspend

1 files changed, 13 insertions, 1 deletions

diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index 1411613f2174..e42925f76b4b 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -1310,6 +1310,16 @@ void i915_check_and_clear_faults(struct drm_device *dev)
         POSTING_READ(RING_FAULT_REG(&dev_priv->ring[RCS]));
 }
 
+static void i915_ggtt_flush(struct drm_i915_private *dev_priv)
+{
+        if (INTEL_INFO(dev_priv->dev)->gen < 6) {
+                intel_gtt_chipset_flush();
+        } else {
+                I915_WRITE(GFX_FLSH_CNTL_GEN6, GFX_FLSH_CNTL_EN);
+                POSTING_READ(GFX_FLSH_CNTL_GEN6);
+        }
+}
+
 void i915_gem_suspend_gtt_mappings(struct drm_device *dev)
 {
         struct drm_i915_private *dev_priv = dev->dev_private;
@@ -1326,6 +1336,8 @@ void i915_gem_suspend_gtt_mappings(struct drm_device *dev)
                                        dev_priv->gtt.base.start,
                                        dev_priv->gtt.base.total,
                                        true);
+
+        i915_ggtt_flush(dev_priv);
 }
 
 void i915_gem_restore_gtt_mappings(struct drm_device *dev)
@@ -1378,7 +1390,7 @@ void i915_gem_restore_gtt_mappings(struct drm_device *dev)
                 gen6_write_pdes(container_of(vm, struct i915_hw_ppgtt, base));
         }
 
-        i915_gem_chipset_flush(dev);
+        i915_ggtt_flush(dev_priv);
 }
 
 int i915_gem_gtt_prepare_object(struct drm_i915_gem_object *obj)