drm/i915/overlay: Combine SWITCH_OFF into a single step

We can program the h/w to first wait on the flip and then switch off
without relying on s/w intervention. This removes the need for a double
step switch off, bringing much rejoicing.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index f757fbd..01ca494 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -167,8 +167,7 @@
 #define HW_WEDGED		1
 #define NEEDS_WAIT_FOR_FLIP	2
 #define RELEASE_OLD_VID		3
-#define SWITCH_OFF_STAGE_1	4
-#define SWITCH_OFF_STAGE_2	5
+#define SWITCH_OFF		4
 };
 
 struct intel_crtc {