drm/i915/ringbuffer: Exclude last 2 cachlines of ring on 845g
authorChris Wilson <chris@chris-wilson.co.uk>
Mon, 9 Apr 2012 12:59:46 +0000 (13:59 +0100)
committerDaniel Vetter <daniel.vetter@ffwll.ch>
Wed, 11 Apr 2012 10:14:24 +0000 (12:14 +0200)
The 845g shares the errata with i830 whereby executing a command
within 2 cachelines of the end of the ringbuffer may cause a GPU hang.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: stable@kernel.org
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
drivers/gpu/drm/i915/intel_ringbuffer.c

index e25581a9f60f3d80ea3cbd60ab282373da7bfe8b..f75806e5bff5c62273ddaee7d5f94bd15cb860e8 100644 (file)
@@ -1038,7 +1038,7 @@ int intel_init_ring_buffer(struct drm_device *dev,
         * of the buffer.
         */
        ring->effective_size = ring->size;
-       if (IS_I830(ring->dev))
+       if (IS_I830(ring->dev) || IS_845G(ring->dev))
                ring->effective_size -= 128;
 
        return 0;