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

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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>

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Chris Wilson 2017-05-30 13:13:34 +01:00

parent 04f7b24ecc

commit aed2fc102f

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drivers/gpu/drm/i915/intel_engine_cs.c

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