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