ar71xx: add support for linux 4.4

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

SVN-Revision: 48563

1 files changed, 76 insertions, 0 deletions

diff --git a/target/linux/ar71xx/patches-4.4/821-serial-core-add-support-for-boot-console-with-arbitr.patch b/target/linux/ar71xx/patches-4.4/821-serial-core-add-support-for-boot-console-with-arbitr.patch
new file mode 100644
index 0000000000..9d6e7bca05
--- /dev/null
+++ b/target/linux/ar71xx/patches-4.4/821-serial-core-add-support-for-boot-console-with-arbitr.patch
@@ -0,0 +1,76 @@
+From 4d3c17975c7814884a721fe693b3adf5c426d759 Mon Sep 17 00:00:00 2001
+From: Hauke Mehrtens <hauke@hauke-m.de>
+Date: Tue, 10 Nov 2015 22:18:39 +0100
+Subject: [RFC] serial: core: add support for boot console with arbitrary
+ baud rates
+
+The Arduino Yun uses a baud rate of 250000 by default. The serial is
+going over the Atmel ATmega and is used to connect to this chip.
+Without this patch Linux wants to switch the console to 230400 Baud.
+
+With this patch Linux will use the configured baud rate and not some
+standard one which is near by.
+
+Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
+---
+ drivers/tty/serial/serial_core.c | 13 ++++++++++---
+ include/linux/console.h          |  1 +
+ 2 files changed, 11 insertions(+), 3 deletions(-)
+
+--- a/drivers/tty/serial/serial_core.c
++++ b/drivers/tty/serial/serial_core.c
+@@ -164,6 +164,8 @@ static int uart_port_startup(struct tty_
+ 	if (retval == 0) {
+ 		if (uart_console(uport) && uport->cons->cflag) {
+ 			tty->termios.c_cflag = uport->cons->cflag;
++			tty->termios.c_ospeed = uport->cons->baud;
++			tty->termios.c_ispeed = uport->cons->baud;
+ 			uport->cons->cflag = 0;
+ 		}
+ 		/*
+@@ -1909,7 +1911,7 @@ static const struct baud_rates baud_rate
+ 	{   4800, B4800   },
+ 	{   2400, B2400   },
+ 	{   1200, B1200   },
+-	{      0, B38400  }
++	{      0, BOTHER  }
+ };
+ 
+ /**
+@@ -1948,10 +1950,13 @@ uart_set_options(struct uart_port *port,
+ 	 * Construct a cflag setting.
+ 	 */
+ 	for (i = 0; baud_rates[i].rate; i++)
+-		if (baud_rates[i].rate <= baud)
++		if (baud_rates[i].rate == baud)
+ 			break;
+ 
+ 	termios.c_cflag |= baud_rates[i].cflag;
++	if (!baud_rates[i].rate) {
++		termios.c_ospeed = baud;
++	}
+ 
+ 	if (bits == 7)
+ 		termios.c_cflag |= CS7;
+@@ -1981,8 +1986,10 @@ uart_set_options(struct uart_port *port,
+ 	 * Allow the setting of the UART parameters with a NULL console
+ 	 * too:
+ 	 */
+-	if (co)
++	if (co) {
+ 		co->cflag = termios.c_cflag;
++		co->baud = baud;
++	}
+ 
+ 	return 0;
+ }
+--- a/include/linux/console.h
++++ b/include/linux/console.h
+@@ -128,6 +128,7 @@ struct console {
+ 	short	flags;
+ 	short	index;
+ 	int	cflag;
++	int	baud;
+ 	void	*data;
+ 	struct	 console *next;
+ };