drm/i915: Fix BDW PPGTT error path
When we fail for some reason on loading the PDPs, it would be wise to disable the PPGTT in the ring registers. If we do not do this, we have undefined results. Signed-off-by: NBen Widawsky <ben@bwidawsk.net> Reviewed-by: NChris Wilson <chris@chris-wilson.co.uk> Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
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