[PATCH] drm/i915/bdw: Restore PPAT on thaw

[Ben Widawsky <benjamin.widawsky@intel.com>]

Apparently it is wiped out from under us, and we get some really fun
caching artifacts upon resume (it seems to be WB for all types by
default).

Reported-by: James Ausmus <james.ausmus@intel.com>
Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
---
 drivers/gpu/drm/i915/i915_gem_gtt.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index bd016e2..1b45a04 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -30,6 +30,8 @@
 #include "i915_trace.h"
 #include "intel_drv.h"
 
+static void gen8_setup_private_ppat(struct drm_i915_private *dev_priv);
+
 bool intel_enable_ppgtt(struct drm_device *dev, bool full)
 {
 	if (i915.enable_ppgtt == 0 || !HAS_ALIASING_PPGTT(dev))
@@ -1371,8 +1373,10 @@ void i915_gem_restore_gtt_mappings(struct drm_device *dev)
 	}
 
 
-	if (INTEL_INFO(dev)->gen >= 8)
+	if (INTEL_INFO(dev)->gen >= 8) {
+		gen8_setup_private_ppat(dev_priv);
 		return;
+	}
 
 	list_for_each_entry(vm, &dev_priv->vm_list, global_link) {
 		/* TODO: Perhaps it shouldn't be gen6 specific */
-- 
1.9.0