From 6a13f93f4a7228247ba4da5cf7d92e7415a05bc5 Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Mon, 9 Apr 2012 13:59:46 +0100 Subject: [PATCH] drm/i915/ringbuffer: Exclude last 2 cachlines of ring on 845g commit 27c1cbd06a7620b354cbb363834f3bb8df4f410d upstream. 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 Signed-off-by: Daniel Vetter Signed-off-by: Greg Kroah-Hartman --- drivers/gpu/drm/i915/intel_ringbuffer.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c index 1f61fc7b754c..2d6039b4571f 100644 --- a/drivers/gpu/drm/i915/intel_ringbuffer.c +++ b/drivers/gpu/drm/i915/intel_ringbuffer.c @@ -863,7 +863,7 @@ 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; -- 2.39.5