R92C_OFDM1_LSTF
reg = urtwn_bb_read(sc, R92C_OFDM1_LSTF);
urtwn_bb_write(sc, R92C_OFDM1_LSTF, reg);
txmode = urtwn_read_1(sc, R92C_OFDM1_LSTF + 3);
urtwn_write_1(sc, R92C_OFDM1_LSTF + 3, txmode & ~0x70);
urtwn_write_1(sc, R92C_OFDM1_LSTF + 3, txmode);