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