[U-Boot] [PATCH] watchdog/imx_watchdog: do not set WCR_WDW

[Stefano Babic]

Hi Sebastian,

On 26/03/2015 09:02, Sebastian Andrzej Siewior wrote:
> On 03/25/2015 04:53 PM, Stefano Babic wrote:
>> On 03/03/2015 17:45, Sebastian Andrzej Siewior wrote:
>>> with WCR_WDW set, the watchdog won't trigger if we bootet linux and idle
>>> around while the watchdog is not triggered. It seems the timer makes
>>> progress very slowly if at all. I managed to remain 20minutes alive
>>> while the timeout was set to 60secs. It reboots within 60secs if I start
>>> a busyloop in userland (something like "while (1) { }").
>>>
>>> While I don't see a reason why the WDT should not be running while the
>>> CPU is in idle, I'm dropping this bit.
>>>
>>> Signed-off-by: Sebastian Andrzej Siewior <bigeasy at linutronix.de>
>>> ---
>>
>> Applied to u-boot-imx, thanks !
> 
> Thanks. What just came to mind: In case you do suspend-to-mem. Would
> the watchdog trigger then? I am not sure and I have no way to test…

I have also not tested, but in my understanding this is ruled by the
WDZST. This is also a write-once bit, and suspend the watchdog timer
during low power modes.

Best regards,
Stefano Babic

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