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76 lines
2.1 KiB
76 lines
2.1 KiB
From 4d3c17975c7814884a721fe693b3adf5c426d759 Mon Sep 17 00:00:00 2001
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From: Hauke Mehrtens <hauke@hauke-m.de>
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Date: Tue, 10 Nov 2015 22:18:39 +0100
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Subject: [RFC] serial: core: add support for boot console with arbitrary
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baud rates
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The Arduino Yun uses a baud rate of 250000 by default. The serial is
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going over the Atmel ATmega and is used to connect to this chip.
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Without this patch Linux wants to switch the console to 230400 Baud.
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With this patch Linux will use the configured baud rate and not some
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standard one which is near by.
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Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
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---
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drivers/tty/serial/serial_core.c | 13 ++++++++++---
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include/linux/console.h | 1 +
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2 files changed, 11 insertions(+), 3 deletions(-)
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--- a/drivers/tty/serial/serial_core.c
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+++ b/drivers/tty/serial/serial_core.c
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@@ -164,6 +164,8 @@ static int uart_port_startup(struct tty_
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if (retval == 0) {
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if (uart_console(uport) && uport->cons->cflag) {
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tty->termios.c_cflag = uport->cons->cflag;
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+ tty->termios.c_ospeed = uport->cons->baud;
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+ tty->termios.c_ispeed = uport->cons->baud;
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uport->cons->cflag = 0;
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}
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/*
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@@ -1901,7 +1903,7 @@ static const struct baud_rates baud_rate
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{ 4800, B4800 },
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{ 2400, B2400 },
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{ 1200, B1200 },
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- { 0, B38400 }
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+ { 0, BOTHER }
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};
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/**
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@@ -1940,10 +1942,13 @@ uart_set_options(struct uart_port *port,
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* Construct a cflag setting.
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*/
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for (i = 0; baud_rates[i].rate; i++)
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- if (baud_rates[i].rate <= baud)
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+ if (baud_rates[i].rate == baud)
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break;
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termios.c_cflag |= baud_rates[i].cflag;
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+ if (!baud_rates[i].rate) {
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+ termios.c_ospeed = baud;
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+ }
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if (bits == 7)
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termios.c_cflag |= CS7;
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@@ -1973,8 +1978,10 @@ uart_set_options(struct uart_port *port,
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* Allow the setting of the UART parameters with a NULL console
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* too:
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*/
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- if (co)
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+ if (co) {
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co->cflag = termios.c_cflag;
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+ co->baud = baud;
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+ }
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return 0;
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}
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--- a/include/linux/console.h
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+++ b/include/linux/console.h
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@@ -127,6 +127,7 @@ struct console {
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short flags;
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short index;
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int cflag;
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+ int baud;
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void *data;
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struct console *next;
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};
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