+ serial-general-fixes-in-the-serial_rs485-structure.patch added to -mm tree

[akpm@linux-foundation.org]

The patch titled
     serial: general fixes in the serial_rs485 structure
has been added to the -mm tree.  Its filename is
     serial-general-fixes-in-the-serial_rs485-structure.patch

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------------------------------------------------------
Subject: serial: general fixes in the serial_rs485 structure
From: Claudio Scordino <claudio@evidence.eu.com>

Fix several issues related to the RS485 interface:

 - It adds the flag SER_RS485_RTS_BEFORE_SEND that was missing from the
   serial_rs485 structure (even if "delay_rts_before_send" was existing)

 - It adds a further "delay_rts_after_send" field for those drivers that
   can have a delay after send (e.g., atmel_serial)

 - It fixes the usage of the structure in the atmel_serial driver (where
   "delay_rts_before_send" should be used instead of "delay_rts_after_send").

Signed-off-by: Claudio Scordino <claudio@evidence.eu.com>
Signed-off-by: Bernhard Roth <br@pwrnet.de>
Cc: Philippe De Muyter <phdm@macqel.be>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 drivers/serial/atmel_serial.c |   11 ++++++++---
 include/linux/serial.h        |    4 +++-
 2 files changed, 11 insertions(+), 4 deletions(-)

diff -puN drivers/serial/atmel_serial.c~serial-general-fixes-in-the-serial_rs485-structure drivers/serial/atmel_serial.c
--- a/drivers/serial/atmel_serial.c~serial-general-fixes-in-the-serial_rs485-structure
+++ a/drivers/serial/atmel_serial.c
@@ -216,7 +216,8 @@ void atmel_config_rs485(struct uart_port
 	if (rs485conf->flags & SER_RS485_ENABLED) {
 		dev_dbg(port->dev, "Setting UART to RS485\n");
 		atmel_port->tx_done_mask = ATMEL_US_TXEMPTY;
-		UART_PUT_TTGR(port, rs485conf->delay_rts_before_send);
+		if (rs485conf->flags & SER_RS485_RTS_AFTER_SEND)
+			UART_PUT_TTGR(port, rs485conf->delay_rts_after_send);
 		mode |= ATMEL_US_USMODE_RS485;
 	} else {
 		dev_dbg(port->dev, "Setting UART to RS232\n");
@@ -291,7 +292,9 @@ static void atmel_set_mctrl(struct uart_
 
 	if (atmel_port->rs485.flags & SER_RS485_ENABLED) {
 		dev_dbg(port->dev, "Setting UART to RS485\n");
-		UART_PUT_TTGR(port, atmel_port->rs485.delay_rts_before_send);
+		if (atmel_port->rs485.flags & SER_RS485_RTS_AFTER_SEND)
+			UART_PUT_TTGR(port,
+					atmel_port->rs485.delay_rts_after_send);
 		mode |= ATMEL_US_USMODE_RS485;
 	} else {
 		dev_dbg(port->dev, "Setting UART to RS232\n");
@@ -1210,7 +1213,9 @@ static void atmel_set_termios(struct uar
 
 	if (atmel_port->rs485.flags & SER_RS485_ENABLED) {
 		dev_dbg(port->dev, "Setting UART to RS485\n");
-		UART_PUT_TTGR(port, atmel_port->rs485.delay_rts_before_send);
+		if (atmel_port->rs485.flags & SER_RS485_RTS_AFTER_SEND)
+			UART_PUT_TTGR(port,
+					atmel_port->rs485.delay_rts_after_send);
 		mode |= ATMEL_US_USMODE_RS485;
 	} else {
 		dev_dbg(port->dev, "Setting UART to RS232\n");
diff -puN include/linux/serial.h~serial-general-fixes-in-the-serial_rs485-structure include/linux/serial.h
--- a/include/linux/serial.h~serial-general-fixes-in-the-serial_rs485-structure
+++ a/include/linux/serial.h
@@ -210,8 +210,10 @@ struct serial_rs485 {
 #define SER_RS485_ENABLED		(1 << 0)
 #define SER_RS485_RTS_ON_SEND		(1 << 1)
 #define SER_RS485_RTS_AFTER_SEND	(1 << 2)
+#define SER_RS485_RTS_BEFORE_SEND	(1 << 3)
 	__u32	delay_rts_before_send;	/* Milliseconds */
-	__u32	padding[6];		/* Memory is cheap, new structs
+	__u32	delay_rts_after_send;	/* Milliseconds */
+	__u32	padding[5];		/* Memory is cheap, new structs
 					   are a royal PITA .. */
 };
 
_

Patches currently in -mm which might be from claudio@evidence.eu.com are

serial-general-fixes-in-the-serial_rs485-structure.patch