UART_XR_EFR      2122 drivers/tty/serial/8250/8250_port.c 		serial_port_out(port, UART_XR_EFR, UART_EFR_ECB);
UART_XR_EFR      2660 drivers/tty/serial/8250/8250_port.c 			serial_port_out(port, UART_XR_EFR, efr);