R92C_RRSR
reg = urtwn_read_1(sc, R92C_RRSR + 2);
urtwn_write_1(sc, R92C_RRSR + 2, reg);
reg = urtwn_read_4(sc, R92C_RRSR);
urtwn_write_4(sc, R92C_RRSR, reg);