DISPC_OVL_POSITION
DUMPREG(dispc, i, DISPC_OVL_POSITION);
dispc_write_reg(dispc, DISPC_OVL_POSITION(plane), val);
DUMPREG(i, DISPC_OVL_POSITION);
dispc_write_reg(DISPC_OVL_POSITION(plane), val);