3.5.7.12 -stable review patch.  If anyone has any objections, please let me 
know.

------------------

From: Luis Henriques <[email protected]>

This reverts commit 899b5509abbdfee2eab408e7178e559346091ad3, which is commit
f05bb0c7b624252a5e768287e340e8e45df96e42 in Linus' tree.

This commit has been shown to cause GPU hangs on Sandy Bridge GPUs

BugLink: http://bugs.launchpad.net/bugs/1140716

Signed-off-by: Steve Conklin <[email protected]>
Acked-by: Brad Figg <[email protected]>
Acked-by: Luis Henriques <[email protected]>
Cc: Chris Wilson <[email protected]>
Cc: Ben Widawsky <[email protected]>
Cc: Daniel Vetter <[email protected]>
Signed-off-by: Luis Henriques <[email protected]>
---
 drivers/gpu/drm/i915/intel_ringbuffer.c | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c 
b/drivers/gpu/drm/i915/intel_ringbuffer.c
index e75d794..78486c7 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -421,11 +421,6 @@ static int init_render_ring(struct intel_ring_buffer *ring)
        if (INTEL_INFO(dev)->gen >= 6)
                I915_WRITE(MI_MODE, 
_MASKED_BIT_ENABLE(ASYNC_FLIP_PERF_DISABLE));
 
-       /* Required for the hardware to program scanline values for waiting */
-       if (INTEL_INFO(dev)->gen == 6)
-               I915_WRITE(GFX_MODE,
-                          _MASKED_BIT_ENABLE(GFX_TLB_INVALIDATE_ALWAYS));
-
        if (IS_GEN7(dev))
                I915_WRITE(GFX_MODE_GEN7,
                           _MASKED_BIT_DISABLE(GFX_TLB_INVALIDATE_ALWAYS) |
-- 
1.8.1.2

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