CRIS: Fix RS485 delay handling.

Very recently, the RS485 interface has been fixed by adding two further
fields (see commit 1b6331848b69d1ed165a6bdc75c4046d68767563).

Check the value of the flag SER_RS485_RTS_BEFORE_SEND before delaying.

Signed-off-by: Claudio Scordino <claudio@evidence.eu.com>
Signed-off-by: Jesper Nilsson <jesper.nilsson@axis.com>

diff --git a/drivers/serial/crisv10.c b/drivers/serial/crisv10.c
index 20402c6..fa62578 100644 (file)
--- a/drivers/serial/crisv10.c
+++ b/drivers/serial/crisv10.c
@@ -1411,11 +1411,12 @@ e100_enable_rs485(struct tty_struct *tty, struct serial_rs485 *r)
                       CONFIG_ETRAX_RS485_LTC1387_RXEN_PORT_G_BIT, 1);
 #endif
 
-       info->rs485.flags = r->flags;
-       if (r->delay_rts_before_send >= 1000)
+       info->rs485 = *r;
+
+       /* Maximum delay before RTS equal to 1000 */
+       if (info->rs485.delay_rts_before_send >= 1000)
                info->rs485.delay_rts_before_send = 1000;
-       else
-               info->rs485.delay_rts_before_send = r->delay_rts_before_send;
+
 /*     printk("rts: on send = %i, after = %i, enabled = %i",
                    info->rs485.rts_on_send,
                    info->rs485.rts_after_sent,
@@ -3234,9 +3235,9 @@ rs_write(struct tty_struct *tty,
                e100_disable_rx(info);
                e100_enable_rx_irq(info);
 #endif
-
-               if (info->rs485.delay_rts_before_send > 0)
-                       msleep(info->rs485.delay_rts_before_send);
+               if ((info->rs485.flags & SER_RS485_RTS_BEFORE_SEND) &&
+                       (info->rs485.delay_rts_before_send > 0))
+                               msleep(info->rs485.delay_rts_before_send);
        }
 #endif /* CONFIG_ETRAX_RS485 */
 
@@ -3694,6 +3695,11 @@ rs_ioctl(struct tty_struct *tty, struct file * file,
 
                rs485data.delay_rts_before_send = rs485ctrl.delay_rts_before_send;
                rs485data.flags = 0;
+               if (rs485data.delay_rts_before_send != 0)
+                       rs485data.flags |= SER_RS485_RTS_BEFORE_SEND;
+               else
+                       rs485data.flags &= ~(SER_RS485_RTS_BEFORE_SEND);
+
                if (rs485ctrl.enabled)
                        rs485data.flags |= SER_RS485_ENABLED;
                else
@@ -4527,6 +4533,7 @@ static int __init rs_init(void)
                /* Set sane defaults */
                info->rs485.flags &= ~(SER_RS485_RTS_ON_SEND);
                info->rs485.flags |= SER_RS485_RTS_AFTER_SEND;
+               info->rs485.flags &= ~(SER_RS485_RTS_BEFORE_SEND);
                info->rs485.delay_rts_before_send = 0;
                info->rs485.flags &= ~(SER_RS485_ENABLED);
 #endif