drm/i915 invalidate indirect state pointers at end of ring exec

This is required by the spec, and without this some 3D programs will
hang after resume from RC6 we enable that.

Signed-off-by: Zou Nan hai <nanhai.zou@intel.com>
Signed-off-by: Eric Anholt <eric@anholt.net>

1 files changed, 9 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 7823b9648176..51e9c9e718c4 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -535,7 +535,16 @@ render_ring_dispatch_gem_execbuffer(struct drm_device *dev,
                 intel_ring_advance(dev, ring);
         }
 
+        if (IS_G4X(dev) || IS_IRONLAKE(dev)) {
+                intel_ring_begin(dev, ring, 2);
+                intel_ring_emit(dev, ring, MI_FLUSH |
+                                MI_NO_WRITE_FLUSH |
+                                MI_INVALIDATE_ISP );
+                intel_ring_emit(dev, ring, MI_NOOP);
+                intel_ring_advance(dev, ring);
+        }
         /* XXX breadcrumb */
+
         return 0;
 }