SMBHSTCNT_SENDRECV
viapcib_smbus_write(sc, SMBHSTCNT, SMBHSTCNT_SENDRECV);
SMBHSTCNT_START | SMBHSTCNT_SENDRECV);
viapcib_smbus_write(sc, SMBHSTCNT, SMBHSTCNT_SENDRECV);
SMBHSTCNT_START | SMBHSTCNT_SENDRECV);