R92C_CCK0_SYSTEM
reg = rtwn_bb_read(sc, R92C_CCK0_SYSTEM);
rtwn_bb_write(sc, R92C_CCK0_SYSTEM, reg);
reg = urtwn_bb_read(sc, R92C_CCK0_SYSTEM);
urtwn_bb_write(sc, R92C_CCK0_SYSTEM, reg);