[Intel-gfx] [PATCH] drm/i915/cnl: WaForceContextSaveRestoreNonCoherent

[Chris Wilson]

Stealing the thread for another gem_workarounds conundrum.

After a reset, we lose the RING_FORCE_TO_NONPRIV registers. If they
where in the context image as we presumed, the values would be retained
and they can be read back from before reset, so it's not the case of
write-only register!

So are they the mythical powercontext but require an LRI after reset to
restore the settings for all logical contexts? Or can we make those into
regular MMIO?
-Chris