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

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
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7
drivers/gpu/drm/i915/intel_ringbuffer.c
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@ -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);