serial: imx: get rid of imx_uart_rts_auto()

Called in only one place, for RS232, it only obscures things, as it
doesn't go well with 2 similar named functions,
imx_uart_rts_inactive() and imx_uart_rts_active(), that both are
RS485-specific.
Reviewed-by: Sascha Hauer <s.hauer@pengutronix.de>
Tested-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Sergey Organov <sorganov@gmail.com>
Link: https://lore.kernel.org/r/1564167161-3972-4-git-send-email-sorganov@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/imx.c

@@ -402,17 +402,6 @@ static void imx_uart_rts_inactive(struct imx_port *sport, u32 *ucr2)
 	mctrl_gpio_set(sport->gpios, sport->port.mctrl);
 }
 
-/* called with port.lock taken and irqs caller dependent */
-static void imx_uart_rts_auto(struct imx_port *sport, u32 *ucr2)
-{
-	/*
-	 * Only let receiver control RTS output if we were not requested to have
-	 * RTS inactive (which then should take precedence).
-	 */
-	if (*ucr2 & UCR2_CTS)
-		*ucr2 |= UCR2_CTSC;
-}
-
 /* called with port.lock taken and irqs off */
 static void imx_uart_start_rx(struct uart_port *port)
 {
@@ -1604,8 +1593,14 @@ imx_uart_set_termios(struct uart_port *port, struct ktermios *termios,
 		else
 			imx_uart_rts_inactive(sport, &ucr2);
 
-	} else if (termios->c_cflag & CRTSCTS)
-		imx_uart_rts_auto(sport, &ucr2);
+	} else if (termios->c_cflag & CRTSCTS) {
+		/*
+		 * Only let receiver control RTS output if we were not requested
+		 * to have RTS inactive (which then should take precedence).
+		 */
+		if (ucr2 & UCR2_CTS)
+			ucr2 |= UCR2_CTSC;
+	}
 
 	if (termios->c_cflag & CRTSCTS)
 		ucr2 &= ~UCR2_IRTS;