R92C_INIRTS_RATE_SEL
rtwn_write_1(sc, R92C_INIRTS_RATE_SEL, 0);
rtwn_write_1(sc, R92C_INIRTS_RATE_SEL, 3);
rtwn_write_1(sc, R92C_INIRTS_RATE_SEL, maxbasicrate);