drm/i915/execlists: Wait for ELSP submission on restart
After a reset, we will ensure that there is at least one request submitted to HW to ensure that a context is loaded for powersaving. Let's wait for this submission via a tasklet to complete before we drop our forcewake, ensuring the system is ready for rc6 before we let it possibly sleep. Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk> Link: https://patchwork.freedesktop.org/patch/msgid/20180522101937.7738-1-chris@chris-wilson.co.ukReviewed-by: NMika Kuoppala <mika.kuoppala@intel.com>
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