target/linux/ath79/patches-5.4/921-serial-core-add-support-for-boot-console-with-arbitr.patch

   1 From 4d3c17975c7814884a721fe693b3adf5c426d759 Mon Sep 17 00:00:00 2001
   2 From: Hauke Mehrtens <hauke@hauke-m.de>
   3 Date: Tue, 10 Nov 2015 22:18:39 +0100
   4 Subject: [RFC] serial: core: add support for boot console with arbitrary
   5  baud rates
   6
   7 The Arduino Yun uses a baud rate of 250000 by default. The serial is
   8 going over the Atmel ATmega and is used to connect to this chip.
   9 Without this patch Linux wants to switch the console to 9600 Baud.
  10
  11 With this patch Linux will use the configured baud rate and not a
  12 default one specified in uart_register_driver().
  13
  14 Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
  15 [rebased to 4.14, slightly reworded commit message]
  16 Signed-off-by: Sungbo Eo <mans0n@gorani.run>
  17 ---
  18  drivers/tty/serial/serial_core.c | 6 +++++-
  19  include/linux/console.h          | 1 +
  20  2 files changed, 6 insertions(+), 1 deletions(-)
  21
  22 --- a/drivers/tty/serial/serial_core.c
  23 +++ b/drivers/tty/serial/serial_core.c
  24 @@ -220,6 +220,8 @@ static int uart_port_startup(struct tty_
  25         if (retval == 0) {
  26                 if (uart_console(uport) && uport->cons->cflag) {
  27                         tty->termios.c_cflag = uport->cons->cflag;
  28 +                       tty->termios.c_ospeed = uport->cons->baud;
  29 +                       tty->termios.c_ispeed = uport->cons->baud;
  30                         uport->cons->cflag = 0;
  31                 }
  32                 /*
  33 @@ -2108,8 +2110,10 @@ uart_set_options(struct uart_port *port,
  34          * Allow the setting of the UART parameters with a NULL console
  35          * too:
  36          */
  37 -       if (co)
  38 +       if (co) {
  39                 co->cflag = termios.c_cflag;
  40 +               co->baud = baud;
  41 +       }
  42
  43         return 0;
  44  }
  45 --- a/include/linux/console.h
  46 +++ b/include/linux/console.h
  47 @@ -153,6 +153,7 @@ struct console {
  48         short   flags;
  49         short   index;
  50         int     cflag;
  51 +       int     baud;
  52         void    *data;
  53         struct   console *next;
  54  };