RK3568_OVL_PORT_SEL
vop2->old_port_sel = vop2_readl(vop2, RK3568_OVL_PORT_SEL);
return vop2_readl(vop2, RK3568_OVL_PORT_SEL);
vop2_writel(vop2, RK3568_OVL_PORT_SEL, port_sel);