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

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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>
This commit is contained in:
Chris Wilson 2012-04-09 13:59:46 +01:00 committed by Daniel Vetter
parent 6a562e3dae
commit 27c1cbd06a
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/i915/intel_ringbuffer.c
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@ -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;