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watchdog: intel-mid_wdt: Keep watchdog running

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Firmware followed by bootloader leaves watchdog running.

Keep it running in the driver.

User will not need any additional options to reboot in case of panic
during boot.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
This commit is contained in:
Andy Shevchenko 2017-03-11 00:22:17 +02:00 committed by Wim Van Sebroeck
parent 0ab1380804
commit 954351e870
1 changed files with 15 additions and 2 deletions
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17
drivers/watchdog/intel-mid_wdt.c
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@ -147,8 +147,21 @@ static int mid_wdt_probe(struct platform_device *pdev)
return ret;
}
/* Make sure the watchdog is not running */
wdt_stop(wdt_dev);
/*
* The firmware followed by U-Boot leaves the watchdog running
* with the default threshold which may vary. When we get here
* we should make a decision to prevent any side effects before
* user space daemon will take care of it. The best option,
* taking into consideration that there is no way to read values
* back from hardware, is to enforce watchdog being run with
* deterministic values.
*/
ret = wdt_start(wdt_dev);
if (ret)
return ret;
/* Make sure the watchdog is serviced */
set_bit(WDOG_HW_RUNNING, &wdt_dev->status);
ret = devm_watchdog_register_device(&pdev->dev, wdt_dev);
if (ret) {