serial: fsl_lpuart: remove redundant code in rs485_config functions

In uart_set_rs485_config() the serial core already ensures that only one of
both options RTS on send or RTS after send is set. It also assigns the
passed serial_rs485 struct to the uart port.

So remove the check and the assignment from the drivers rs485_config()
function to avoid redundancy.
Signed-off-by: NLino Sanfilippo <LinoSanfilippo@gmx.de>
Link: https://lore.kernel.org/r/20220410104642.32195-9-LinoSanfilippo@gmx.deSigned-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/fsl_lpuart.c

@@ -1377,19 +1377,6 @@ static int lpuart_config_rs485(struct uart_port *port,
 		/* Enable auto RS-485 RTS mode */
 		modem |= UARTMODEM_TXRTSE;
 
-		/*
-		 * RTS needs to be logic HIGH either during transfer _or_ after
-		 * transfer, other variants are not supported by the hardware.
-		 */
-
-		if (!(rs485->flags & (SER_RS485_RTS_ON_SEND |
-				SER_RS485_RTS_AFTER_SEND)))
-			rs485->flags |= SER_RS485_RTS_ON_SEND;
-
-		if (rs485->flags & SER_RS485_RTS_ON_SEND &&
-				rs485->flags & SER_RS485_RTS_AFTER_SEND)
-			rs485->flags &= ~SER_RS485_RTS_AFTER_SEND;
-
 		/*
 		 * The hardware defaults to RTS logic HIGH while transfer.
 		 * Switch polarity in case RTS shall be logic HIGH
@@ -1402,9 +1389,6 @@ static int lpuart_config_rs485(struct uart_port *port,
 			modem |= UARTMODEM_TXRTSPOL;
 	}
 
-	/* Store the new configuration */
-	sport->port.rs485 = *rs485;
-
 	writeb(modem, sport->port.membase + UARTMODEM);
 	return 0;
 }
@@ -1428,19 +1412,6 @@ static int lpuart32_config_rs485(struct uart_port *port,
 		/* Enable auto RS-485 RTS mode */
 		modem |= UARTMODEM_TXRTSE;
 
-		/*
-		 * RTS needs to be logic HIGH either during transfer _or_ after
-		 * transfer, other variants are not supported by the hardware.
-		 */
-
-		if (!(rs485->flags & (SER_RS485_RTS_ON_SEND |
-				SER_RS485_RTS_AFTER_SEND)))
-			rs485->flags |= SER_RS485_RTS_ON_SEND;
-
-		if (rs485->flags & SER_RS485_RTS_ON_SEND &&
-				rs485->flags & SER_RS485_RTS_AFTER_SEND)
-			rs485->flags &= ~SER_RS485_RTS_AFTER_SEND;
-
 		/*
 		 * The hardware defaults to RTS logic HIGH while transfer.
 		 * Switch polarity in case RTS shall be logic HIGH
@@ -1453,9 +1424,6 @@ static int lpuart32_config_rs485(struct uart_port *port,
 			modem |= UARTMODEM_TXRTSPOL;
 	}
 
-	/* Store the new configuration */
-	sport->port.rs485 = *rs485;
-
 	lpuart32_write(&sport->port, modem, UARTMODIR);
 	return 0;
 }