UART_FCTR_RX 2165 drivers/tty/serial/8250/8250_port.c fctr = serial_in(up, UART_FCTR) & ~(UART_FCTR_RX|UART_FCTR_TX); UART_FCTR_RX 2167 drivers/tty/serial/8250/8250_port.c fctr | UART_FCTR_TRGD | UART_FCTR_RX);