drm/radeon/kms: re-apply 2007d633d639c896396e4c4b53b38068f3831307

Got accidently reverted by c93bb85b5cba3e3a06f2cad8e9bc5c23d3d10aac

Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@linux.ie>
1 file changed