From 88b2ab346436f799b99894a3e9518a3ffa344524 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Ren=C3=A9=20Rebe?= Date: Mon, 17 Nov 2025 13:11:24 +0100 Subject: [PATCH] fix it87_wdt early reboot by reporting running timer MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit 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 Reviewed-by: Guenter Roeck Signed-off-by: Guenter Roeck Signed-off-by: Wim Van Sebroeck --- drivers/watchdog/it87_wdt.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/drivers/watchdog/it87_wdt.c b/drivers/watchdog/it87_wdt.c index 3b8488c86a2f3..1d9f8591f38d8 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) { -- 2.47.3