tty: serial: 8250: 8250_core: NXP SC16C2552 workaround

NXP SC16C2552 requires that we always write a reset to the RX FIFO and
TX FIFO whenever we enable the FIFOs

Cc: [email protected]
Signed-off-by: Steve Shih <[email protected]>
Signed-off-by: David Singleton <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: Steve Shih

drivers/tty/serial/8250/8250_port.c

@@ -83,7 +83,8 @@ static const struct serial8250_config uart_config[] = {
 		.name		= "16550A",
 		.fifo_size	= 16,
 		.tx_loadsz	= 16,
-		.fcr		= UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10,
+		.fcr		= UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10 |
+				  UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT,
 		.rxtrig_bytes	= {1, 4, 8, 14},
 		.flags		= UART_CAP_FIFO,
 	},