linux/Documentation/watchdog
Marc van der Wal 0bcd0b6a47 watchdog: it87_wdt: Work around non-working CIR interrupts
On some hardware platforms, the it87_wdt watchdog resets the machine
despite the watchdog daemon running and writing to /dev/watchdog.

This is due to Consumer IR buffer underrun interrupts being used as
triggers to reset the timer.  On some buggy hardware implementations
such as the iEi AFL-12A-N270 single-board computer, this method does
not work.

However, resetting the timer by writing its original timeout value in
its configuration register over and over again suppresses the unwanted
reboots.

Add a module option (nocir), 0 by default in order not to break existing
setups.  Setting it to 1 enables the workaround.

Fixes bug #42801 <https://bugzilla.kernel.org/show_bug.cgi?id=42801>.
Tested primarily on Linux 3.5.7, applies cleanly on Linux 3.13.5.

Signed-off-by: Marc van der Wal <x0r+kernel@x0r.fr>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
2014-03-31 13:33:55 +02:00
..
src watchdog: fix watchdog-test.c build warning 2012-08-29 17:12:58 +02:00
convert_drivers_to_kernel_api.txt watchdog: Add support for WDIOC_GETTIMELEFT IOCTL in watchdog core 2012-03-27 20:15:37 +02:00
hpwdt.txt Fix common misspellings 2011-03-31 11:26:23 -03:00
pcwd-watchdog.txt [WATCHDOG] clean-up watchdog documentation 2007-05-24 17:26:11 +00:00
watchdog-api.txt [WATCHDOG] doc: Fix use of WDIOC_SETOPTIONS ioctl. 2010-04-06 14:23:55 +00:00
watchdog-kernel-api.txt watchdog: core: dt: add support for the timeout-sec dt property 2013-03-01 12:48:36 +01:00
watchdog-parameters.txt watchdog: it87_wdt: Work around non-working CIR interrupts 2014-03-31 13:33:55 +02:00
wdt.txt watchdog: update/improve/consolidate watchdog driver 2010-05-25 09:05:34 +00:00