UPF_HARDPPS_CD
port->flags |= UPF_HARDPPS_CD;
port->flags &= ~UPF_HARDPPS_CD;
port->flags |= UPF_HARDPPS_CD;
port->flags &= ~UPF_HARDPPS_CD;
port->flags |= UPF_HARDPPS_CD;
port->flags &= ~UPF_HARDPPS_CD;
port->flags |= UPF_HARDPPS_CD;
port->flags &= ~UPF_HARDPPS_CD;
port->flags |= UPF_HARDPPS_CD;
port->flags &= ~UPF_HARDPPS_CD;
#define UART_ENABLE_MS(port,cflag) ((port)->flags & UPF_HARDPPS_CD || \