drm/i915/execlists: Flush the post-sync breadcrumb write harder

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Quite rarely we see that the CS completion event fires before the
breadcrumb is coherent, which presumably is a result of the CS_STALL not
waiting for the post-sync operation. Try throwing in a DC_FLUSH into
the following pipecontrol to see if that makes any difference.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Acked-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190827120615.31390-1-chris@chris-wilson.co.uk

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Chris Wilson 2019-08-27 13:06:15 +01:00

parent c4e6488120

commit e8f6b4952e

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drivers/gpu/drm/i915/gt/intel_lrc.c

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