Commit 27c1cbd0 authored by Chris Wilson's avatar Chris Wilson Committed by Daniel Vetter

drm/i915/ringbuffer: Exclude last 2 cachlines of ring on 845g

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: default avatarChris Wilson <chris@chris-wilson.co.uk>
Cc: stable@kernel.org
Signed-off-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
parent 6a562e3d
...@@ -1038,7 +1038,7 @@ int intel_init_ring_buffer(struct drm_device *dev, ...@@ -1038,7 +1038,7 @@ int intel_init_ring_buffer(struct drm_device *dev,
* of the buffer. * of the buffer.
*/ */
ring->effective_size = ring->size; ring->effective_size = ring->size;
if (IS_I830(ring->dev)) if (IS_I830(ring->dev) || IS_845G(ring->dev))
ring->effective_size -= 128; ring->effective_size -= 128;
return 0; return 0;
......
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