YT921X_PORT_VLAN_CTRL1_CVLAN_DROP_UNTAGGED
YT921X_PORT_VLAN_CTRL1_CVLAN_DROP_UNTAGGED;
ctrl |= YT921X_PORT_VLAN_CTRL1_CVLAN_DROP_UNTAGGED;
mask = YT921X_PORT_VLAN_CTRL1_CVLAN_DROP_UNTAGGED;
mask = YT921X_PORT_VLAN_CTRL1_CVLAN_DROP_UNTAGGED;