R92C_C2HEVT_CLEAR
rtwn_write_1(sc, R92C_C2HEVT_CLEAR, 0);
status = rtwn_pci_read_1(sc, R92C_C2HEVT_CLEAR);
rtwn_pci_write_1(sc, R92C_C2HEVT_CLEAR, R92C_C2HEVT_HOST_CLOSE);