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charset="utf-8" From: Jan Kiszka esb_initdevice() unconditionally disabled the WDT, stopping a watchdog that firmware had left running instead of taking over its care. Detect the enable bit in the lock register, set WDOG_HW_RUNNING like the other watchdog drivers do, and simply reset the timeout to the configured value. Assisted-by: opencode:Qwen3.8-27B Signed-off-by: Jan Kiszka --- Background to patch this: The i6300esb is the only watchdog model that=20 QEMU provides for non-x86 virt machines. It can serve there to test=20 complex system integrations. Patches to add a U-Boot driver were sent as=20 well: https://lore.kernel.org/u-boot/cover.1788526864.git.jan.kiszka@siemens.com/ Background for this unusual as assistance: While crafting this with own=20 hands or using some cloud-hosted frontier model would have been much=20 quicker, I used this practical case to try out what could be done in the=20 background on my ordinary notebook already. Reviewing, testing (it=20 worked immediately) and a bit shortening was done by me, analysis and=20 patch fell out of the opencode after some half-day of thinking. drivers/watchdog/i6300esb.c | 19 +++++++++++++++---- 1 file changed, 15 insertions(+), 4 deletions(-) diff --git a/drivers/watchdog/i6300esb.c b/drivers/watchdog/i6300esb.c index a30835f547b3..13daafe05c43 100644 --- a/drivers/watchdog/i6300esb.c +++ b/drivers/watchdog/i6300esb.c @@ -264,13 +264,21 @@ static void esb_initdevice(struct esb_dev *edev) */ pci_write_config_word(edev->pdev, ESB_CONFIG_REG, 0x0003); =20 - /* Check that the WDT isn't already locked */ + /* Check the current state of the WDT */ pci_read_config_byte(edev->pdev, ESB_LOCK_REG, &val1); if (val1 & ESB_WDT_LOCK) dev_warn(&edev->pdev->dev, "nowayout already set\n"); =20 - /* Set the timer to watchdog mode and disable it for now */ - pci_write_config_byte(edev->pdev, ESB_LOCK_REG, 0x00); + if (val1 & ESB_WDT_ENABLE) { + /* + * The watchdog is already running, e.g. enabled by + * firmware. Do not stop it, just mark it as running. + */ + set_bit(WDOG_HW_RUNNING, &edev->wdd.status); + } else { + /* Set the timer to watchdog mode and disable it for now */ + pci_write_config_byte(edev->pdev, ESB_LOCK_REG, 0x00); + } =20 /* Check if the watchdog was previously triggered */ esb_unlock_registers(edev); @@ -301,7 +309,10 @@ static int esb_probe(struct pci_dev *pdev, if (!esb_getdevice(edev)) return -ENODEV; =20 - /* Initialize the watchdog and make sure it does not run */ + /* + * Initialize the watchdog, keeping it running if it was already + * started, e.g. by firmware. + */ edev->wdd.info =3D &esb_info; edev->wdd.ops =3D &esb_ops; edev->wdd.min_timeout =3D ESB_HEARTBEAT_MIN; --=20 2.47.3