[Intel-gfx] [PATCH] drm/i915/ringbuffer: 2-step restart

[Joonas Lahtinen]

Quoting Chris Wilson (2018-11-26 14:28:21)
> We may be simply restarting too fast for the culmudgeonly gen3/gen4 as
> we still see missing interrupts following a reset. So let's try
> restarting a little slower, first wake up the ring empty and then tell
> it about the work it has to perform.
> 
> References: https://bugs.freedesktop.org/show_bug.cgi?id=108735
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>

Won't affect later Gens using ELSP, so:

Reviewed-by: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>

Regards, Joonas