drm: SiS 315 Awareness.

Add support for the SiS 315 to the DRM.

Signed-off-by: Dave Airlie <airlied@linux.ie>
diff --git a/drivers/char/drm/sis_drv.c b/drivers/char/drm/sis_drv.c
index 93880e4..3d5b321 100644
--- a/drivers/char/drm/sis_drv.c
+++ b/drivers/char/drm/sis_drv.c
@@ -69,6 +69,7 @@
 	.load = sis_driver_load,
 	.unload = sis_driver_unload,
 	.context_dtor = NULL,
+	.dma_quiescent = sis_idle,
 	.reclaim_buffers = NULL,
 	.reclaim_buffers_locked = sis_reclaim_buffers_locked,
 	.lastclose = sis_lastclose,