PLANE_CTL
val = I915_READ(PLANE_CTL(pipe, plane_id));
val = I915_READ(PLANE_CTL(pipe, plane_id));
I915_WRITE_FW(PLANE_CTL(pipe, plane_id), plane_ctl);
I915_WRITE_FW(PLANE_CTL(pipe, plane_id), 0);
ret = I915_READ(PLANE_CTL(plane->pipe, plane_id)) & PLANE_CTL_ENABLE;