R92C_MAC_SPEC_SIFS
rtwn_write_1(sc, R92C_MAC_SPEC_SIFS + 1, 10);
rtwn_write_2(sc, R92C_MAC_SPEC_SIFS, 0x1010);
urtwn_write_1(sc, R92C_MAC_SPEC_SIFS + 1, sifs_time);
urtwn_write_2(sc, R92C_MAC_SPEC_SIFS, 0x100a);