diff options
| author | Chris Wilson <chris@chris-wilson.co.uk> | 2018-12-03 11:36:56 +0000 |
|---|---|---|
| committer | Chris Wilson <chris@chris-wilson.co.uk> | 2018-12-03 12:25:42 +0000 |
| commit | f36c071f6344e0a335ed4b4e0b3a38c0dd54648b (patch) | |
| tree | 8a3ecd53b4a09199a2f23b596a6118b4e803174b /drivers/gpu | |
| parent | f0ad62a631e040ae4413286a4b46a90c5ce42d07 (diff) | |
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
Diffstat (limited to 'drivers/gpu')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_ringbuffer.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c index 28ae1e436ea6..d81eaf5f6b3e 100644 --- a/drivers/gpu/drm/i915/intel_ringbuffer.c +++ b/drivers/gpu/drm/i915/intel_ringbuffer.c @@ -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); |