TSE MAC Software Reset doesn't complete

This if_Mode register (word address 0x94) is there only if you enable the PCS. If not this address it will map to the register 0x14 of the PHY whose address is configured in mdio_addr0.

The mdio1.reg14 (word address 0xb4) will always map to the register 0x14 of the PHY whose address is configured in mdio_addr1.

The TSE driver is probably using the mdio1 address space instead of mdio0 so that it can support the configurations with PCS enabled (as in this case the PCS registers are placed in the mdio0 space).