diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_ringbuffer.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c index 05969f03c0c1..16371a444426 100644 --- a/drivers/gpu/drm/i915/intel_ringbuffer.c +++ b/drivers/gpu/drm/i915/intel_ringbuffer.c | |||
| @@ -532,6 +532,9 @@ static int init_ring_common(struct intel_engine_cs *ring) | |||
| 532 | else | 532 | else |
| 533 | ring_setup_phys_status_page(ring); | 533 | ring_setup_phys_status_page(ring); |
| 534 | 534 | ||
| 535 | /* Enforce ordering by reading HEAD register back */ | ||
| 536 | I915_READ_HEAD(ring); | ||
| 537 | |||
| 535 | /* Initialize the ring. This must happen _after_ we've cleared the ring | 538 | /* Initialize the ring. This must happen _after_ we've cleared the ring |
| 536 | * registers with the above sequence (the readback of the HEAD registers | 539 | * registers with the above sequence (the readback of the HEAD registers |
| 537 | * also enforces ordering), otherwise the hw might lose the new ring | 540 | * also enforces ordering), otherwise the hw might lose the new ring |