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| author | Ben Widawsky <benjamin.widawsky@intel.com> | 2014-06-30 09:53:43 -0700 |
|---|---|---|
| committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2014-07-07 23:16:55 +0200 |
| commit | bae4fcd2c7b778a3f69e03e244221cd4932b8f67 (patch) | |
| tree | 5341467f3fc6f8c76d2dc822925b2c4e0c3606e2 /drivers/gpu/drm/i915/intel_ringbuffer.c | |
| parent | e04934cf256154fd6cc88a0767e45bd1b4920419 (diff) | |
| download | op-kernel-dev-bae4fcd2c7b778a3f69e03e244221cd4932b8f67.zip op-kernel-dev-bae4fcd2c7b778a3f69e03e244221cd4932b8f67.tar.gz | |
drm/i915/bdw: poll semaphores
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.vivi@intel.com>
Tested-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
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.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c index 8819680..e18ed05 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, |
