drm/i915/gt: Disable arbitration around Braswell's pdp updates
Braswell's pdp workaround is full of dragons, that may be being angered when they are interrupted. Let's not take that risk and disable arbitration during the update. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20210111105735.21515-1-chris@chris-wilson.co.uk
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