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authorBen Widawsky <ben@bwidawsk.net>2012-04-11 11:18:21 -0700
committerDaniel Vetter <daniel.vetter@ffwll.ch>2012-04-12 21:14:14 +0200
commit1500f7ea06858819abcf8eec8f952e2f9281c610 (patch)
tree2e29c9de3db986d3e10a6317973c1db6bd3e8bf7 /drivers/gpu/drm/i915/intel_ringbuffer.c
parente3a5a2250aa9e67d169f33e6c91dc7604cab513b (diff)
drm/i915: hide (seqno-1) in ringbuffer code
Waiting for seqno-1 in our object synchronization code is an implementation detail given how we've decided to do the waits within the rest of our code. Requested-by: Daniel Vetter <daniel.vetter@ffwll.ch> Signed-off-by: Ben Widawsky <benjamin.widawsky@intel.com> Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Diffstat (limited to 'drivers/gpu/drm/i915/intel_ringbuffer.c')
-rw-r--r--drivers/gpu/drm/i915/intel_ringbuffer.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index dfdb613752c5..467b3319e4bd 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -482,6 +482,12 @@ intel_ring_sync(struct intel_ring_buffer *waiter,
MI_SEMAPHORE_COMPARE |
MI_SEMAPHORE_REGISTER;
+ /* Throughout all of the GEM code, seqno passed implies our current
+ * seqno is >= the last seqno executed. However for hardware the
+ * comparison is strictly greater than.
+ */
+ seqno -= 1;
+
ret = intel_ring_begin(waiter, 4);
if (ret)
return ret;