Linux/AM3352: Board fails to wakeup from Deepsleep0

Jayadev K

Part Number: AM3352
Other Parts Discussed in Thread: AM3358,

Tool/software: Linux

I'm trying to to put my board into low power mode by entering into deep sleep using rtcwake command. The command is executed in a loop with a user-defined count, something like the one below.

while（1）
{
rtcwake -m mem -s 10
}

I'm observing that the device fails to wakeup after the loop runs for sometime, say over 3000 cycles.

I'm using 4.9.69 kernel and I could find a known issue in the release notes which says

LCPD-7256	P3-Medium	Board sometimes hangs after suspend/resume cycle	Power & Thermal		am335x-evm, am43xx-gpevm, am57xx-evm

Link to release notes :

Is there any fix available for this issue yet ? Or can I have more insight about the root cause for the same ?

I could find a very similar thread but which was not followed up ;

Any leads on this issue could be really helpful.

Thanks and Regards,

Jayadev

over 8 years ago

0 RonB over 8 years ago

TI__Mastermind 31006 points

Jayadev,

I am looking into the issue you referenced for the latest status and possible workarounds.

0 Jayadev K over 8 years ago in reply to RonB

Prodigy 250 points

Thanks Ron. Please do update about the root cause/ workarounds as and when you find them.

Regards,
Jayadev

0 Jayadev K over 8 years ago in reply to RonB

Prodigy 250 points

Hello Ron,

What is the approximate timeline that we can expect for the next version release with a fix for this issue ? Could you please provide some insight.

Regards,

Jayadev

0 RonB over 8 years ago in reply to Jayadev K

TI__Mastermind 31006 points

Jayadev,

We ran some short term tests and they pass. We need to run some overnight tests to see if we can reproduce the issue with more like the 3000 iterations you are using. It may take a couple of more days to get these results.

0 Jayadev K over 8 years ago in reply to RonB

Prodigy 250 points

Hi Ron,

Is there some update on this issue ?

Regards,

Jayadev

0 Nick Saulnier over 8 years ago in reply to Jayadev K

TI__Guru** 111000 points

Hello Jayadev,

The overnight tests of running

rtcwake -d /dev/rtc0 -m mem -s 30

on Linux 4.9 could not reproduce the issue you observed.

Could you try Brad's suggestions on that post you linked and let us know what the results are?

0 Jayadev K over 8 years ago in reply to Nick Saulnier

Prodigy 250 points

Hi Nick,

We were able to see the hang issue sometimes after 4 days, or 6 days and even longer in other cases. And when it hangs, we don't have access to A8 and debugging via JTAG isn't a possible option. Is there some other way to debug it ?

Regards,
Jayadev

0 Nick Saulnier over 8 years ago in reply to Jayadev K

TI__Guru** 111000 points

Hello Jayadev,

Debugging will be harder without JTAG. Do take a look through the wiki Debugging AM335x Suspend-Resume issues that was linked in that post. Issues can be caused by any number of things: a linux driver, a race condition, an error in DDR memory, etc.

Trying "no console_suspend" would be a good first step to try to get some information. If you can isolate if the system is hanging while going down into suspend or while coming back up out of suspend, that helps inform where to look next.

If you can replicate the issue on a BeagleBone Black or TI AM335x EVM, that would also help to isolate if the issue is based on hardware from your custom board or on software. I was told the AM3358 on the BeagleBone Black should behave the same as your AM3352 when it comes to entering and exiting low power modes.

Regards,

Nick

0 RonB over 8 years ago in reply to Nick Saulnier

TI__Mastermind 31006 points

Jayadev,

We haven't heard back from you on this in while. We're going to assume you see a path forward. If you need further help, please feel free to reply back.

Thanks...

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Linux/AM3352: Board fails to wakeup from Deepsleep0