How to put Juno into Sleep-state

Hi Sudeep,

Thank you for your reply.

First, the previous message meant the issue surfaces when I try to suspend & resume twice continuously.

The steps to reproduce this issue are as follows:

     0. I am using Juno-R1 with Linaro 16.05 latest.

     1. [Set rtc] # echo +5 > /sys/class/rtc/rtc0/wakealarm

     2. [Suspend] # echo mem > /sys/power/state

          (after 5 seconds) Resume

     3. wait about 10seconds

     4. [Set rtc] # echo +5 > /sys/class/rtc/rtc0/wakealarm

     5. [Suspend] # echo mem > /sys/power/state

          (Juno does not resume)

And I understood it was the cause of this issue that there was no trigger of Resume, because the Suspend process took more than 5 seconds and it was into the Suspend State after RTC interrupt occurred.

Actually, the issue did not happen when I changed alarm of RTC 10 seconds.

So I have a question.

     Why does 2nd Suspend process take more than 5 seconds ?

     1st Suspend process does not take 1 second.

     And 2nd Suspend process does not take 1 second if the above steps.3 is "wait a second".

I would appreciate it if you could answer my question.

Regards

Hi Sudeep,

Thank you for your reply.

First, the previous message meant the issue surfaces when I try to suspend & resume twice continuously.

The steps to reproduce this issue are as follows:

     0. I am using Juno-R1 with Linaro 16.05 latest.

     1. [Set rtc] # echo +5 > /sys/class/rtc/rtc0/wakealarm

     2. [Suspend] # echo mem > /sys/power/state

          (after 5 seconds) Resume

     3. wait about 10seconds

     4. [Set rtc] # echo +5 > /sys/class/rtc/rtc0/wakealarm

     5. [Suspend] # echo mem > /sys/power/state

          (Juno does not resume)

And I understood it was the cause of this issue that there was no trigger of Resume, because the Suspend process took more than 5 seconds and it was into the Suspend State after RTC interrupt occurred.

Actually, the issue did not happen when I changed alarm of RTC 10 seconds.

So I have a question.

     Why does 2nd Suspend process take more than 5 seconds ?

     1st Suspend process does not take 1 second.

     And 2nd Suspend process does not take 1 second if the above steps.3 is "wait a second".

I would appreciate it if you could answer my question.

Regards

Hi taken,

Thanks for taking time to explain the details.

I understand you are using Linaro 16.05 release now, but I want to make know which

kernel are you trying ? Is it Linaro release or the mainline.

One possible reason could be the some driver is taking long to complete it's suspend

and rtc expires before entering suspend.

I tried with defconfig on v4.7-rc4 and I don't see any issue.

I need more information on the kernel configuration to check this.

Regards,

Sudeep

Hi Sudeep,

Thanks for your prompt reply.

I tried with defconfig on Linaro 16.05 latest and the issue did not happen as well as v4.7-rc4.

There is much difference between defconfig and linaro config, so I am trying to check them.

Regards

Hi,

I reported that the issue surfaces when I try to suspend & resume twice continuously with Linaro 16.05 latest above.
At that time I used prebuilt binaries (snapshots.linaro.org/.../ : Now not found),
but the binaries that built from a source code (fetched by the following commands) does not surface the issue.

     # repo init -u https://git.linaro.org/landing-teams/working/arm/manifest -b 16.05 -m pinned-latest.xml
     # repo sync

Thank you.

Hi Taken,

I am confused. Is the problem solved for you now ?

Regards,

Sudeep

Hi Sudeep,

Sorry that I didn't write the conclusion.
Yes, the problem was solved.

Thank you so much for all your help.

Regards