drm/i915/selftests: Flush the preemption request before waiting
Make sure that the request has been submitted to HW before we begin our wait. This reduces our reliance on the semaphore yield interrupt driving the preemption request. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Matthew Auld <matthew.auld@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20201222113536.3775-2-chris@chris-wilson.co.uk
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