drm/i915/gt: Flush submission tasklet before waiting/retiring
A common bane of ours is arbitrary delays in ksoftirqd processing our submission tasklet. Give the submission tasklet a kick before we wait to avoid those delays eating into a tight timeout. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Stuart Summers <stuart.summers@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20191008105655.13256-1-chris@chris-wilson.co.uk
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