[Intel-gfx] [PATCH] drm/i915/bdw: Flush system agent on gen8 also

[Ben Widawsky]

gem_gtt_cpu_tlb seems to indicate that it is needed.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=72869

Signed-off-by: Ben Widawsky <b...@bwidawsk.net>
---
 drivers/gpu/drm/i915/i915_gem_gtt.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c 
b/drivers/gpu/drm/i915/i915_gem_gtt.c
index 998f9a0..2386356 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -1195,14 +1195,12 @@ static void gen8_ggtt_insert_entries(struct 
i915_address_space *vm,
                WARN_ON(readq(&gtt_entries[i-1])
                        != gen8_pte_encode(addr, level, true));
 
-#if 0 /* TODO: Still needed on GEN8? */
        /* This next bit makes the above posting read even more important. We
         * want to flush the TLBs only after we're certain all the PTE updates
         * have finished.
         */
        I915_WRITE(GFX_FLSH_CNTL_GEN6, GFX_FLSH_CNTL_EN);
        POSTING_READ(GFX_FLSH_CNTL_GEN6);
-#endif
 }
 
 /*
-- 
1.8.5.2

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