drm/i915/gtt: Downgrade Cherryview back to aliasing-ppgtt
With the upcoming change in timing (dramatically reducing the latency between manipulating the ppGTT and execution), no amount of tweaking could save Cherryview, it would always fail to invalidate its TLB. Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk> Acked-by: NMatthew Auld <matthew.auld@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190830180000.24608-2-chris@chris-wilson.co.uk
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