diff options
| author |  Stephan Gerhold <stephan.gerhold@kernkonzept.com>
| 2022-06-29 10:48:16 +0200 |
|---|---|---|
| committer |  Wim Van Sebroeck <wim@linux-watchdog.org>
| 2022-07-23 14:21:28 +0200 |
| commit | 066951ca33ced33f84a725214494df2ee8ad49bd (patch) | |
| tree | 66a47e79aa646a9dc4878721c1486e14892da10e /drivers/watchdog | |
| parent | watchdog: pm8916_wdt: Report reboot reason (diff) | |
| download | linux-066951ca33ced33f84a725214494df2ee8ad49bd.tar.gz linux-066951ca33ced33f84a725214494df2ee8ad49bd.tar.bz2 linux-066951ca33ced33f84a725214494df2ee8ad49bd.zip | |
watchdog: pm8916_wdt: Handle watchdog enabled by bootloader
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>
Diffstat (limited to 'drivers/watchdog')
| -rw-r--r-- | drivers/watchdog/pm8916_wdt.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/watchdog/pm8916_wdt.c b/drivers/watchdog/pm8916_wdt.c index 49f1a5204526..f4bfbffaf49c 100644 --- a/drivers/watchdog/pm8916_wdt.c +++ b/drivers/watchdog/pm8916_wdt.c @@ -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, |