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| author | René Rebe <rene@exactco.de> | 2025-11-17 15:11:24 +0300 |
|---|---|---|
| committer | Sasha Levin <sashal@kernel.org> | 2026-03-04 15:21:25 +0300 |
| commit | bf66b535daed1cd0a0e208a87ccc07325902f7f9 (patch) | |
| tree | e78682f1f354b597a835109037a6c5053e3746fb /drivers | |
| parent | 29e9413dfae9898078f3dda801471d3b0f51c9bb (diff) | |
| download | linux-bf66b535daed1cd0a0e208a87ccc07325902f7f9.tar.xz | |
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')
| -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 1a5a0a2c3f2e..8c42cb41fa23 100644 --- a/drivers/watchdog/it87_wdt.c +++ b/drivers/watchdog/it87_wdt.c @@ -186,6 +186,12 @@ 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; @@ -372,6 +378,12 @@ 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) { |