From: Ben Widawsky benjamin.widaw...@intel.com
As Ville points out, it's possible/probable we don't actually need this.
Potentially, this validates the letter of the spec, and not the spirit.
Ville:
I discussed this on irc w/ Ben, and I was suggesting we don't need to
poll. Polling apparently can be used as a workaround for certain
hardware issues, but it looks like those issues shouldn't affect us,
for the momemnt at least. So my suggestion was to try w/o polling
first (since there could be some power cost to polling) and add the
poll bit if problems arise.
Rodrigo: Spec suggests this as an W/A for GT3. However semaphores didn't
worked in my BDW GT2 on Signal Mode. So pool mode is definitely needed.
Reviewed-by: Rodrigo Vivi rodrigo.v...@intel.com
Tested-by: Rodrigo Vivi rodrigo.v...@intel.com
Signed-off-by: Ben Widawsky b...@bwidawsk.net
Signed-off-by: Rodrigo Vivi rodrigo.v...@intel.com
---
drivers/gpu/drm/i915/intel_ringbuffer.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c
b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 2e0413c..7a6112e 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -847,6 +847,7 @@ gen8_ring_sync(struct intel_engine_cs *waiter,
intel_ring_emit(waiter, MI_SEMAPHORE_WAIT |
MI_SEMAPHORE_GLOBAL_GTT |
+ MI_SEMAPHORE_POLL |
MI_SEMAPHORE_SAD_GTE_SDD);
intel_ring_emit(waiter, seqno);
intel_ring_emit(waiter,
--
1.9.3
___
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
http://lists.freedesktop.org/mailman/listinfo/intel-gfx
