diff options
| -rw-r--r-- | drivers/gpu/drm/i915/gt/selftest_engine_pm.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/gpu/drm/i915/gt/selftest_engine_pm.c b/drivers/gpu/drm/i915/gt/selftest_engine_pm.c index 41dc1a542cd6..2c898622bdfb 100644 --- a/drivers/gpu/drm/i915/gt/selftest_engine_pm.c +++ b/drivers/gpu/drm/i915/gt/selftest_engine_pm.c @@ -110,13 +110,15 @@ static int __measure_timestamps(struct intel_context *ce, cpu_relax(); /* Run the request for a 100us, sampling timestamps before/after */ - preempt_disable(); - *dt = local_clock(); + local_irq_disable(); write_semaphore(&sema[2], 0); + while (READ_ONCE(sema[1]) == 0) /* wait for the gpu to catch up */ + cpu_relax(); + *dt = local_clock(); udelay(100); *dt = local_clock() - *dt; write_semaphore(&sema[2], 1); - preempt_enable(); + local_irq_enable(); if (i915_request_wait(rq, 0, HZ / 2) < 0) { i915_request_put(rq); |