sleep affecting watchdog timeout

pratyushtomar — Wed, 23 May 2018 13:48:46 GMT

I have an i.mx6UL board and I am running watchdog daemon in this. I am facing following problem.

In watchdog.conf file I have set watchdog-timeout = 20 seconds. This board reboots after 20 seconds if I kill watchdog daemon with SIGINT signal and this behaviour is expected. But if I put board to sleep using echo mem > /sys/power/state and I kill watchdog daemon once I wake up board the board reboots after more than watchdog-timeout = 20 seconds. In fact it boots after more than 2 minutes.

Is this expected behaviour? Shouldn't the board reboot after 20 seconds since I have set watchdog-timeout = 20 seconds? What does it take more than 2 minutes if I put board to sleep? Even the default watchdog-timeout is 1min in i.mx6UL.

Re: sleep affecting watchdog timeout

igorpadykov — Thu, 24 May 2018 05:44:21 GMT

Hi Pratyush

wdog behaviour in low power modes is defined by WDOGx_WCR

WDZST, WDW bits, so one can check them.

Best regards
igor
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i.MX Processorsのトピックsleep affecting watchdog timeout

sleep affecting watchdog timeout

Re: sleep affecting watchdog timeout