drm/i915: No LLC_MLC for HSW.

The mid-level cache or as it's more commonly referred to now as L3, is
not setup this way on HSW.
Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>
Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/i915_gem_gtt.c

@@ -217,6 +217,10 @@ void i915_ppgtt_bind_object(struct i915_hw_ppgtt *ppgtt,
 
 	switch (cache_level) {
 	case I915_CACHE_LLC_MLC:
+		/* Haswell doesn't set L3 this way */
+		if (IS_HASWELL(obj->base.dev))
+			pte_flags |= GEN6_PTE_CACHE_LLC;
+		else
 			pte_flags |= GEN6_PTE_CACHE_LLC_MLC;
 		break;
 	case I915_CACHE_LLC:
@@ -252,12 +256,12 @@ static unsigned int cache_level_to_agp_type(struct drm_device *dev,
 {
 	switch (cache_level) {
 	case I915_CACHE_LLC_MLC:
-		if (INTEL_INFO(dev)->gen >= 6)
-			return AGP_USER_CACHED_MEMORY_LLC_MLC;
 		/* Older chipsets do not have this extra level of CPU
 		 * cacheing, so fallthrough and request the PTE simply
 		 * as cached.
 		 */
+		if (INTEL_INFO(dev)->gen >= 6 && !IS_HASWELL(dev))
+			return AGP_USER_CACHED_MEMORY_LLC_MLC;
 	case I915_CACHE_LLC:
 		return AGP_USER_CACHED_MEMORY;
 	default: