[Intel-gfx] [PATCH] drm/i915/execlists: Wait for ELSP submission on restart

[Chris Wilson]

Quoting Chris Wilson (2018-05-22 11:19:37)
> 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
> possible sleep.
> 
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>

Pushed with corrections and review from Mika (on a later thread). Thanks,
-Chris