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

drivers/gpu/drm/i915/intel_ringbuffer.c

+1 −1
Original line number Diff line number Diff line
@@ -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;