1 files changed, 18 insertions, 14 deletions

diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index a70356dad1b7..e3e152cbc75e 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -205,6 +205,7 @@ struct imx_port {
         struct timer_list       timer;
         unsigned int            old_status;
         unsigned int            have_rtscts:1;
+        unsigned int            have_rtsgpio:1;
         unsigned int            dte_mode:1;
         unsigned int            irda_inv_rx:1;
         unsigned int            irda_inv_tx:1;
@@ -335,15 +336,15 @@ static void imx_port_ucrs_restore(struct uart_port *port,
 
 static void imx_port_rts_active(struct imx_port *sport, unsigned long *ucr2)
 {
-        *ucr2 &= ~UCR2_CTSC;
-        *ucr2 |= UCR2_CTS;
+        *ucr2 &= ~(UCR2_CTSC | UCR2_CTS);
 
         mctrl_gpio_set(sport->gpios, sport->port.mctrl | TIOCM_RTS);
 }
 
 static void imx_port_rts_inactive(struct imx_port *sport, unsigned long *ucr2)
 {
-        *ucr2 &= ~(UCR2_CTSC | UCR2_CTS);
+        *ucr2 &= ~UCR2_CTSC;
+        *ucr2 |= UCR2_CTS;
 
         mctrl_gpio_set(sport->gpios, sport->port.mctrl & ~TIOCM_RTS);
 }
@@ -376,9 +377,9 @@ static void imx_stop_tx(struct uart_port *port)
             readl(port->membase + USR2) & USR2_TXDC) {
                 temp = readl(port->membase + UCR2);
                 if (port->rs485.flags & SER_RS485_RTS_AFTER_SEND)
-                        imx_port_rts_inactive(sport, &temp);
-                else
                         imx_port_rts_active(sport, &temp);
+                else
+                        imx_port_rts_inactive(sport, &temp);
                 temp |= UCR2_RXEN;
                 writel(temp, port->membase + UCR2);
 
@@ -584,9 +585,9 @@ static void imx_start_tx(struct uart_port *port)
         if (port->rs485.flags & SER_RS485_ENABLED) {
                 temp = readl(port->membase + UCR2);
                 if (port->rs485.flags & SER_RS485_RTS_ON_SEND)
-                        imx_port_rts_inactive(sport, &temp);
-                else
                         imx_port_rts_active(sport, &temp);
+                else
+                        imx_port_rts_inactive(sport, &temp);
                 if (!(port->rs485.flags & SER_RS485_RX_DURING_TX))
                         temp &= ~UCR2_RXEN;
                 writel(temp, port->membase + UCR2);
@@ -1476,9 +1477,9 @@ imx_set_termios(struct uart_port *port, struct ktermios *termios,
                                  */
                                 if (port->rs485.flags &
                                     SER_RS485_RTS_AFTER_SEND)
-                                        imx_port_rts_inactive(sport, &ucr2);
-                                else
                                         imx_port_rts_active(sport, &ucr2);
+                                else
+                                        imx_port_rts_inactive(sport, &ucr2);
                         } else {
                                 imx_port_rts_auto(sport, &ucr2);
                         }
@@ -1488,9 +1489,9 @@ imx_set_termios(struct uart_port *port, struct ktermios *termios,
         } else if (port->rs485.flags & SER_RS485_ENABLED) {
                 /* disable transmitter */
                 if (port->rs485.flags & SER_RS485_RTS_AFTER_SEND)
-                        imx_port_rts_inactive(sport, &ucr2);
-                else
                         imx_port_rts_active(sport, &ucr2);
+                else
+                        imx_port_rts_inactive(sport, &ucr2);
         }
 
 
@@ -1725,16 +1726,16 @@ static int imx_rs485_config(struct uart_port *port,
         rs485conf->delay_rts_after_send = 0;
 
         /* RTS is required to control the transmitter */
-        if (!sport->have_rtscts)
+        if (!sport->have_rtscts && !sport->have_rtsgpio)
                 rs485conf->flags &= ~SER_RS485_ENABLED;
 
         if (rs485conf->flags & SER_RS485_ENABLED) {
                 /* disable transmitter */
                 temp = readl(sport->port.membase + UCR2);
                 if (rs485conf->flags & SER_RS485_RTS_AFTER_SEND)
-                        imx_port_rts_inactive(sport, &temp);
-                else
                         imx_port_rts_active(sport, &temp);
+                else
+                        imx_port_rts_inactive(sport, &temp);
                 writel(temp, sport->port.membase + UCR2);
         }
 
@@ -2048,6 +2049,9 @@ static int serial_imx_probe_dt(struct imx_port *sport,
         if (of_get_property(np, "fsl,dte-mode", NULL))
                 sport->dte_mode = 1;
 
+        if (of_get_property(np, "rts-gpios", NULL))
+                sport->have_rtsgpio = 1;
+
         return 0;
 }
 #else