Random hangs during resume on 4.1.15 kernel

[dougjene]

Hi All,

I am using 4.1.15 freescale kernel on iMX6DL board. I tried using suspend to disk feature on this board and suspend worked fine.

But when I resume there are random hangs observed i.e., sometimes it hangs very early and sometimes at the last stage of resume.

Also I see that problem maybe with timers. When I enabled "CONFIG_DEBUG_TIMEKEEPING" , I received below error messages during resume. I suspect hang may be because of improper timer resume. Please correct me if I am wrong

[ 0.005027] INFO: timekeeping: Cycle offset (4281355128) is larger than the the 'mxc_timer1' clock's 50% safety margin (2147483647)
[ 0.005034] timekeeping: Your kernel is still fine, but is feeling a bit nervous
[ 0.005039] WARNING: Underflow in clocksource 'mxc_timer1' observed, time update ignored.
[ 0.005041] Please report this, consider using a different clocksource, if possible.
[ 0.005045] Your kernel is probably still fine.

I tried 3.14 kernel and everything worked fine.

I have also tried disabling CPU freq and Bus freq but same issue occurs.

AnsonHuang‌ igorpadykov‌ 

Guys please let me know your opinions

Regards

[igorpadykov]

Hi Doug

please refer to Chapter 21 Low-level Power Management (PM) Driver

attached Linux Manual for low power functionality supported in

nxp linux bsps. Seems suspend to disk is not supported, this may

be posted on kernel mail list.

Best regards
igor
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[dougjene]

Hi Igor,

Thank you for the reference. But I see no problem in 3.14 freescale kernel so I posted it here. And also pm related commits are done by AnsonHuang‌ , so maybe he can help

Thanks