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authorAdrian Schmutzler <freifunk@adrianschmutzler.de>2020-08-02 18:08:21 +0200
committerAdrian Schmutzler <freifunk@adrianschmutzler.de>2020-08-02 18:15:45 +0200
commit1b3aca91423255d011707452a1fc2071313c665c (patch)
tree8ff37815dbdf70272c35ab59ddb52c18ac5e2170 /target/linux
parentf6acabcbdc455d2032f5a935ead2fedf781e8ce2 (diff)
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ath79: restore 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 9600 Baud. With this patch Linux will use the configured baud rate and not a default one specified in uart_register_driver(). This has been added for ath79 4.19 and 5.4 in master as part of fc59b2f79b50 ("ath79: add support for Arduino Yun"), this backports it separately to 4.14. Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>
Diffstat (limited to 'target/linux')
-rw-r--r--target/linux/ath79/patches-4.14/921-serial-core-add-support-for-boot-console-with-arbitr.patch54
1 files changed, 54 insertions, 0 deletions
diff --git a/target/linux/ath79/patches-4.14/921-serial-core-add-support-for-boot-console-with-arbitr.patch b/target/linux/ath79/patches-4.14/921-serial-core-add-support-for-boot-console-with-arbitr.patch
new file mode 100644
index 0000000000..23b6d73959
--- /dev/null
+++ b/target/linux/ath79/patches-4.14/921-serial-core-add-support-for-boot-console-with-arbitr.patch
@@ -0,0 +1,54 @@
+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 9600 Baud.
+
+With this patch Linux will use the configured baud rate and not a
+default one specified in uart_register_driver().
+
+Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
+[rebased to 4.14, slightly reworded commit message]
+Signed-off-by: Sungbo Eo <mans0n@gorani.run>
+---
+ drivers/tty/serial/serial_core.c | 6 +++++-
+ include/linux/console.h | 1 +
+ 2 files changed, 6 insertions(+), 1 deletions(-)
+
+--- a/drivers/tty/serial/serial_core.c
++++ b/drivers/tty/serial/serial_core.c
+@@ -232,6 +232,8 @@ 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;
+ }
+ /*
+@@ -2072,8 +2074,10 @@ 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
+@@ -145,6 +145,7 @@ struct console {
+ short flags;
+ short index;
+ int cflag;
++ int baud;
+ void *data;
+ struct console *next;
+ };