diff options
| author | René Rebe <rene@exactco.de> | 2025-11-17 13:11:24 +0100 |
|---|---|---|
| committer | Sasha Levin <sashal@kernel.org> | 2026-03-04 07:20:35 -0500 |
| commit | 5b3350e036670260002c80fb245e8faffbdf0e6f (patch) | |
| tree | 904b57c6e56c8615d3506fb84f0ae482a991f861 /drivers/watchdog | |
| parent | 812e5d3bcc1eab4a512736fee9ebfef1c45cf31b (diff) | |
fix it87_wdt early reboot by reporting running timer
[ Upstream commit 88b2ab346436f799b99894a3e9518a3ffa344524 ]
Some products, such as the Ugreen DXP4800 Plus NAS, ship with the it87
wdt enabled by the firmware and a broken BIOS option that does not
allow to change the time or turn it off. As this makes installing
Linux rather difficult, change the it87_wdt to report it running to
the watchdog core.
Signed-off-by: René Rebe <rene@exactco.de>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/watchdog')
| -rw-r--r-- | drivers/watchdog/it87_wdt.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/watchdog/it87_wdt.c b/drivers/watchdog/it87_wdt.c index 3b8488c86a2f..1d9f8591f38d 100644 --- a/drivers/watchdog/it87_wdt.c +++ b/drivers/watchdog/it87_wdt.c @@ -188,6 +188,12 @@ static void _wdt_update_timeout(unsigned int t) superio_outb(t >> 8, WDTVALMSB); } +/* Internal function, should be called after superio_select(GPIO) */ +static bool _wdt_running(void) +{ + return superio_inb(WDTVALLSB) || (max_units > 255 && superio_inb(WDTVALMSB)); +} + static int wdt_update_timeout(unsigned int t) { int ret; @@ -374,6 +380,12 @@ static int __init it87_wdt_init(void) } } + /* wdt already left running by firmware? */ + if (_wdt_running()) { + pr_info("Left running by firmware.\n"); + set_bit(WDOG_HW_RUNNING, &wdt_dev.status); + } + superio_exit(); if (timeout < 1 || timeout > max_units * 60) { |