[Intel-gfx] [PATCH] drm/i915: Report engines are idle if already parked

[Chris Wilson]

Quoting Mika Kuoppala (2019-02-28 09:08:21)
> Chris Wilson <chris at chris-wilson.co.uk> writes:
> 
> > If we have parked, then we must have passed an idleness test and still
> > be idle. We chose not to use this shortcut in the past so that we could
> > use the idleness test at any time and inspect HW. However, some HW like
> > Sandybridge, doesn't like being woken up frivolously, so avoid doing so.
> >
> > References: 0b702dca2658 ("drm/i915: Avoid waking the engines just to check if they are idle")
> > Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> > Cc: Mika Kuoppala <mika.kuoppala at intel.com>
> 
> Reviewed-by: Mika Kuoppala <mika.kuoppala at linux.intel.com>

Ta, let's hope this sticks! :)
-Chris