RK3568_OVL_LAYER_SEL
vop2->old_layer_sel = vop2_readl(vop2, RK3568_OVL_LAYER_SEL);
return vop2_readl(vop2, RK3568_OVL_LAYER_SEL);
atv_layer_sel = vop2_readl(vop2, RK3568_OVL_LAYER_SEL);
vop2_writel(vop2, RK3568_OVL_LAYER_SEL, layer_sel);