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watchdog: s3c2410: Let kernel kick watchdog

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When "tmr_atboot" module param is set, the watchdog is started in
driver's probe. In that case, also set WDOG_HW_RUNNING bit to let
watchdog core driver know it's running. This way watchdog core can kick
the watchdog for us (if CONFIG_WATCHDOG_HANDLE_BOOT_ENABLED option is
enabled), until user space takes control.

WDOG_HW_RUNNING bit must be set before registering the watchdog. So the
"tmr_atboot" handling code is moved before watchdog registration, to
avoid performing the same check twice. This is also logical because
WDOG_HW_RUNNING bit makes WDT core expect actually running watchdog.

Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20211107202943.8859-5-semen.protsenko@linaro.org
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
This commit is contained in:
Sam Protsenko 2021-11-21 18:56:39 +02:00 committed by Wim Van Sebroeck
parent f197d47584
commit a90102e358
1 changed files with 15 additions and 11 deletions
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26
drivers/watchdog/s3c2410_wdt.c
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@ -604,6 +604,21 @@ static int s3c2410wdt_probe(struct platform_device *pdev)
wdt->wdt_device.bootstatus = s3c2410wdt_get_bootstatus(wdt);
wdt->wdt_device.parent = dev;
/*
* If "tmr_atboot" param is non-zero, start the watchdog right now. Also
* set WDOG_HW_RUNNING bit, so that watchdog core can kick the watchdog.
*
* If we're not enabling the watchdog, then ensure it is disabled if it
* has been left running from the bootloader or other source.
*/
if (tmr_atboot) {
dev_info(dev, "starting watchdog timer\n");
s3c2410wdt_start(&wdt->wdt_device);
set_bit(WDOG_HW_RUNNING, &wdt->wdt_device.status);
} else {
s3c2410wdt_stop(&wdt->wdt_device);
}
ret = watchdog_register_device(&wdt->wdt_device);
if (ret)
goto err_cpufreq;
@ -612,17 +627,6 @@ static int s3c2410wdt_probe(struct platform_device *pdev)
if (ret < 0)
goto err_unregister;
if (tmr_atboot) {
dev_info(dev, "starting watchdog timer\n");
s3c2410wdt_start(&wdt->wdt_device);
} else {
/* if we're not enabling the watchdog, then ensure it is
* disabled if it has been left running from the bootloader
* or other source */
s3c2410wdt_stop(&wdt->wdt_device);
}
platform_set_drvdata(pdev, wdt);
/* print out a statement of readiness */