MT_WFDMA0_TX_RING2_EXT_CTRL
mwx_write(sc, MT_WFDMA0_TX_RING2_EXT_CTRL, P(0x300, 0x10));
mwx_write(sc, MT_WFDMA0_TX_RING2_EXT_CTRL, P(0x1c0, 0x4));