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watchdog: pm8916_wdt: Handle watchdog enabled by bootloader

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The bootloader might already enable the watchdog to catch hangs
during the boot process. In that case the kernel needs to ping
the watchdog temporarily until userspace is fully started.

Add a check for this in the probe() function and set the WDOG_HW_RUNNING
flag to make the watchdog core handle this automatically.

Signed-off-by: Stephan Gerhold <stephan.gerhold@kernkonzept.com>
Reviewed-by: Loic Poulain <loic.poulain@linaro.org>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20220629084816.125515-4-stephan.gerhold@kernkonzept.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:
Stephan Gerhold 2022-06-29 10:48:16 +02:00 committed by Wim Van Sebroeck
parent e7c54a412f
commit 066951ca33
1 changed files with 10 additions and 0 deletions
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10
drivers/watchdog/pm8916_wdt.c
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@ -142,6 +142,7 @@ static int pm8916_wdt_probe(struct platform_device *pdev)
struct device *dev = &pdev->dev;
struct pm8916_wdt *wdt;
struct device *parent;
unsigned int val;
int err, irq;
u8 poff[2];
@ -199,6 +200,15 @@ static int pm8916_wdt_probe(struct platform_device *pdev)
if (poff[1] & PON_POFF_REASON2_OTST3)
wdt->wdev.bootstatus |= WDIOF_OVERHEAT;
err = regmap_read(wdt->regmap, wdt->baseaddr + PON_PMIC_WD_RESET_S2_CTL2,
&val);
if (err) {
dev_err(dev, "failed to check if watchdog is active: %d\n", err);
return err;
}
if (val & S2_RESET_EN_BIT)
set_bit(WDOG_HW_RUNNING, &wdt->wdev.status);
/* Configure watchdog to hard-reset mode */
err = regmap_write(wdt->regmap,
wdt->baseaddr + PON_PMIC_WD_RESET_S2_CTL,