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watchdog: qcom_wdt: set WDOG_HW_RUNNING bit when appropriate

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If the watchdog hardware is enabled/running during boot, e.g.
due to a boot loader configuring it, we must tell the
watchdog framework about this fact so that it can ping the
watchdog until userspace opens the device and takes over
control.

Do so using the WDOG_HW_RUNNING flag that exists for exactly
that use-case.

Signed-off-by: Robert Marko <robert.marko@sartura.hr>
Cc: Luka Perkov <luka.perkov@sartura.hr>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20201031121115.542752-1-robert.marko@sartura.hr
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
This commit is contained in:
Robert Marko 2020-10-31 13:11:15 +01:00 committed by Wim Van Sebroeck
parent 4600736f05
commit 8650d0f9e9
1 changed files with 18 additions and 0 deletions
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18
drivers/watchdog/qcom-wdt.c
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@ -152,6 +152,13 @@ static int qcom_wdt_restart(struct watchdog_device *wdd, unsigned long action,
return 0;
}
static int qcom_wdt_is_running(struct watchdog_device *wdd)
{
struct qcom_wdt *wdt = to_qcom_wdt(wdd);
return (readl(wdt_addr(wdt, WDT_EN)) & QCOM_WDT_ENABLE);
}
static const struct watchdog_ops qcom_wdt_ops = {
.start = qcom_wdt_start,
.stop = qcom_wdt_stop,
@ -294,6 +301,17 @@ static int qcom_wdt_probe(struct platform_device *pdev)
wdt->wdd.timeout = min(wdt->wdd.max_timeout, 30U);
watchdog_init_timeout(&wdt->wdd, 0, dev);
/*
* If WDT is already running, call WDT start which
* will stop the WDT, set timeouts as bootloader
* might use different ones and set running bit
* to inform the WDT subsystem to ping the WDT
*/
if (qcom_wdt_is_running(&wdt->wdd)) {
qcom_wdt_start(&wdt->wdd);
set_bit(WDOG_HW_RUNNING, &wdt->wdd.status);
}
ret = devm_watchdog_register_device(dev, &wdt->wdd);
if (ret)
return ret;