[Intel-gfx] [PATCH] drm/i915: Move hsw GT w/a to engine initialisation

[Chris Wilson]

Quoting Chris Wilson (2017-11-03 10:38:38)
> Quoting Ville Syrjälä (2017-11-03 10:25:17)
> > This problem doesn't seem like it should be specific to HSW. So I wonder
> > if we should start by just reverting that offending patch and move just
> > the watermark thing out to some earlier position in the sequence.
> 
> Whatever makes the simpler cc:stable patch. We have to overhaul these
> register initialisations, and I definitely pity the poor soul who has to
> navigate all the old bspecs to work out where each register needs to
> live.
> 
> Ville do you want to take a pass at splitting the wm from clock-gating?

I think the conclusion we take from the more generic patch to split vm
from clock-gating is that there are display w/a that we need to apply
very early during HW probing. So ultimately we do need to split display
and GT w/a. Should we just run with this patch to fixup the known
regression and hope there are no others before we complete the w/a
splitting?
-Chris