This solves some "unclaimed register" messages when there's a GPU hang
on Haswell.
Signed-off-by: NPaulo Zanoni <paulo.r.zanoni@intel.com>
Reviewed-by: NBen Widawsky <ben@bwidawsk.net>
[danvet: Add missing IS_VLV check as spotted by Ville Syrjälä.]
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>