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watchdog: msc313e: Check if the WDT was running at boot

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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>
This commit is contained in:
Daniel Palmer 2021-12-28 16:34:27 +09:00 committed by Wim Van Sebroeck
parent 4ed224aeaf
commit ffd264bd15
1 changed files with 4 additions and 0 deletions
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4
drivers/watchdog/msc313e_wdt.c
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@ -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);