redonkable/alistair23-linux
redonkable/alistair23-linux
1
0
Fork 0
Code Releases Activity

drm/i915/ringbuffer: Clear semaphore sync registers on ring init

Browse source 
Ensure that the sync registers are cleared every time we restart the
ring to avoid stale values from creeping in from random neutrinos.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=108888
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20181203113701.12106-3-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2018-12-03 11:36:56 +00:00
parent f0ad62a631
commit f36c071f63
1 changed files with 7 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

7
drivers/gpu/drm/i915/intel_ringbuffer.c
View file

@ -529,6 +529,13 @@ static int init_ring_common(struct intel_engine_cs *engine)
intel_engine_reset_breadcrumbs(engine);
if (HAS_LEGACY_SEMAPHORES(engine->i915)) {
I915_WRITE(RING_SYNC_0(engine->mmio_base), 0);
I915_WRITE(RING_SYNC_1(engine->mmio_base), 0);
if (HAS_VEBOX(dev_priv))
I915_WRITE(RING_SYNC_2(engine->mmio_base), 0);
}
/* Enforce ordering by reading HEAD register back */
I915_READ_HEAD(engine);