[Intel-gfx] [PATCH v3] drm/i915: Enable WaProgramMgsrForCorrectSliceSpecificMmioReads for Gen9

[Chris Wilson]

Quoting Tvrtko Ursulin (2021-03-05 09:23:02)
> I am not sure if PC8 and DMC could also be involved from what Cooper was 
> saying in a different thread. Maybe another CI run without the DMC, both 
> ffs and fls. Another for limiting cstates.

Disabling the dmc leaves the display code in an inconsistent state so we
don't complete a BAT run; but since the warnings are thrown during boot
we can say that disabling the dmc does clear up the workaround issues on
ehl/jsl:

https://intel-gfx-ci.01.org/tree/drm-tip/Trybot_7612/fi-ehl-2/boot0.txt
https://intel-gfx-ci.01.org/tree/drm-tip/Trybot_7612/fi-jsl-1/boot0.txt
-Chris