drm/i915/gt: Use non-forcewake writes for RPS
Use non-forcewaked writes to queue RPS register changes that will take effect when the write buffer is flushed, rather than wake the mmio device for immediate effect. This is so that we can avoid a slow forcewake dance upon unparking, and at our irregular updates. Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk> Cc: Andi Shyti <andi.shyti@intel.com> Reviewed-by: NAndi Shyti <andi.shyti@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20191218210545.3975426-1-chris@chris-wilson.co.uk
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