From ffd264bd152cbf88fcf5ced04d3d380c77020231 Mon Sep 17 00:00:00 2001 From: Daniel Palmer <daniel@0x0f.com> Date: Tue, 28 Dec 2021 16:34:27 +0900 Subject: [PATCH] watchdog: msc313e: Check if the WDT was running at boot Check if the WDT was running at boot and set the running flag if it was. This prevents the system from getting rebooted if the userland daemon doesn't take over soon enough or there isn't a userland daemon at all. Signed-off-by: Daniel Palmer <daniel@0x0f.com> Reviewed-by: Romain Perier <romain.perier@gmail.com> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Link: https://lore.kernel.org/r/20211228073427.2443174-1-daniel@0x0f.com Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org> --- drivers/watchdog/msc313e_wdt.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/watchdog/msc313e_wdt.c b/drivers/watchdog/msc313e_wdt.c index 0d497aa0fb7d9..90171431fc594 100644 --- a/drivers/watchdog/msc313e_wdt.c +++ b/drivers/watchdog/msc313e_wdt.c @@ -120,6 +120,10 @@ static int msc313e_wdt_probe(struct platform_device *pdev) priv->wdev.max_timeout = U32_MAX / clk_get_rate(priv->clk); priv->wdev.timeout = MSC313E_WDT_DEFAULT_TIMEOUT; + /* If the period is non-zero the WDT is running */ + if (readw(priv->base + REG_WDT_MAX_PRD_L) | (readw(priv->base + REG_WDT_MAX_PRD_H) << 16)) + set_bit(WDOG_HW_RUNNING, &priv->wdev.status); + watchdog_set_drvdata(&priv->wdev, priv); watchdog_init_timeout(&priv->wdev, timeout, dev); -- 2.30.2