R92C_HMETFR
rtwn_write_1(sc, R92C_HMETFR + 3, 0x20);
rtwn_write_1(sc, R92C_HMETFR, 0xf);
if (!(rtwn_read_1(sc, R92C_HMETFR) & (1 << sc->fwcur)))