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drm/i915: Check the ring is empty when declaring the engines are idle 

As another precaution when testing whether the CS engine is actually
idle, also inspect the ring's HEAD/TAIL registers, which should be equal
when there are no commands left to execute by the GPU.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170530121334.17364-3-chris@chris-wilson.co.uk
Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>
This commit is contained in:
Chris Wilson 2017-05-30 13:13:34 +01:00
parent 04f7b24ecc
commit aed2fc102f
1 changed files with 5 additions and 0 deletions
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5
drivers/gpu/drm/i915/intel_engine_cs.c
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@ -1212,6 +1212,11 @@ static bool ring_is_idle(struct intel_engine_cs *engine)
intel_runtime_pm_get(dev_priv);
/* First check that no commands are left in the ring */
if ((I915_READ_HEAD(engine) & HEAD_ADDR) !=
(I915_READ_TAIL(engine) & TAIL_ADDR))
idle = false;
/* No bit for gen2, so assume the CS parser is idle */
if (INTEL_GEN(dev_priv) > 2 && !(I915_READ_MODE(engine) & MODE_IDLE))
idle = false;