[PATCH 77/79] hmm

[Chris Wilson]

---
 drivers/gpu/drm/i915/i915_gem_gtt.c | 15 +++------------
 1 file changed, 3 insertions(+), 12 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index f4259d5a8391..19ba3e24f85f 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -1391,16 +1391,12 @@ static void gen6_write_page_range(struct drm_i915_private *dev_priv,
 				  struct i915_page_directory *pd,
 				  uint32_t start, uint32_t length)
 {
-	struct i915_ggtt *ggtt = &dev_priv->ggtt;
 	struct i915_page_table *pt;
 	uint32_t pde;
 
 	gen6_for_each_pde(pt, pd, start, length, pde)
 		gen6_write_pde(pd, pde, pt);
-
-	/* Make sure write is complete before other code can use this page
-	 * table. Also require for WC mapped PTEs */
-	readl(ggtt->gsm);
+	wmb();
 }
 
 static uint32_t get_pd_offset(struct i915_hw_ppgtt *ppgtt)
@@ -2172,7 +2168,6 @@ static void gen8_ggtt_clear_range(struct i915_address_space *vm,
 				      I915_CACHE_LLC);
 	for (i = 0; i < num_entries; i++)
 		gen8_set_pte(&gtt_base[i], scratch_pte);
-	readl(gtt_base);
 }
 
 static void gen6_ggtt_clear_range(struct i915_address_space *vm,
@@ -2197,7 +2192,6 @@ static void gen6_ggtt_clear_range(struct i915_address_space *vm,
 
 	for (i = 0; i < num_entries; i++)
 		iowrite32(scratch_pte, &gtt_base[i]);
-	readl(gtt_base);
 }
 
 static void i915_ggtt_insert_page(struct i915_address_space *vm,
@@ -2221,7 +2215,6 @@ static void i915_ggtt_insert_entries(struct i915_address_space *vm,
 		AGP_USER_MEMORY : AGP_USER_CACHED_MEMORY;
 
 	intel_gtt_insert_sg_entries(pages, start >> PAGE_SHIFT, flags);
-
 }
 
 static void i915_ggtt_clear_range(struct i915_address_space *vm,
@@ -2321,14 +2314,12 @@ static void ggtt_unbind_vma(struct i915_vma *vma)
 
 	if (vma->flags & I915_VMA_GLOBAL_BIND) {
 		intel_runtime_pm_get(i915);
-		vma->vm->clear_range(vma->vm,
-				     vma->node.start, size);
+		vma->vm->clear_range(vma->vm, vma->node.start, size);
 		intel_runtime_pm_put(i915);
 	}
 
 	if (vma->flags & I915_VMA_LOCAL_BIND && appgtt)
-		appgtt->base.clear_range(&appgtt->base,
-					 vma->node.start, size);
+		appgtt->base.clear_range(&appgtt->base, vma->node.start, size);
 }
 
 void i915_gem_gtt_finish_pages(struct drm_i915_gem_object *obj,
-- 
2.11.0