R88E_HISR
rtwn_write_4(sc, R88E_HISR, 0xffffffff);
rtwn_write_4(sc, R88E_HISR, 0xffffffff);
rtwn_write_4(sc, R88E_HISR, 0x00000000);
status = rtwn_pci_read_4(sc, R88E_HISR);
rtwn_pci_write_4(sc, R88E_HISR, status);