From ec151f31cd81cc99b957d6b528709d6ecfb25801 Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Wed, 15 Feb 2017 08:43:50 +0000 Subject: [PATCH] drm/i915: Remove superfluous posting reads after clear GGTT The barrier here is not required - we apply the barrier before the range is ever reused by the GPU instead. Signed-off-by: Chris Wilson Reviewed-by: Matthew Auld Link: http://patchwork.freedesktop.org/patch/msgid/20170215084357.19977-16-chris@chris-wilson.co.uk --- drivers/gpu/drm/i915/i915_gem_gtt.c | 3 --- 1 file changed, 3 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c index 76ec3fa0a67a..234a65e8f7b1 100644 --- a/drivers/gpu/drm/i915/i915_gem_gtt.c +++ b/drivers/gpu/drm/i915/i915_gem_gtt.c @@ -2184,7 +2184,6 @@ static void gen8_ggtt_clear_range(struct i915_address_space *vm, for (i = 0; i < num_entries; i++) gen8_set_pte(>t_base[i], scratch_pte); - readl(gtt_base); } static void gen6_ggtt_clear_range(struct i915_address_space *vm, @@ -2209,7 +2208,6 @@ static void gen6_ggtt_clear_range(struct i915_address_space *vm, for (i = 0; i < num_entries; i++) iowrite32(scratch_pte, >t_base[i]); - readl(gtt_base); } static void i915_ggtt_insert_page(struct i915_address_space *vm, @@ -2233,7 +2231,6 @@ 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, -- 2.20.1