Symbol: UART_FCTR_TX
drivers/tty/serial/8250/8250_port.c
2119
fctr = serial_in(up, UART_FCTR) & ~(UART_FCTR_RX|UART_FCTR_TX);
drivers/tty/serial/8250/8250_port.c
2123
serial_port_out(port, UART_FCTR, fctr | UART_FCTR_TX);