RTWN_CHIP_92C_1T2R
sc->ntxchains = (sc->chip & RTWN_CHIP_92C_1T2R) ? 1 : 2;
sc->chip |= RTWN_CHIP_92C_1T2R;
if (sc->sc_sc.chip & RTWN_CHIP_92C_1T2R) {