topic Re: CPU waking from sleep returns to sleep. in i.MX Processors

CPU waking from sleep returns to sleep.

A_Guyula — Mon, 21 Apr 2025 22:04:11 GMT

I have an imx8 mini processor, trying out a wake from sleep operation.
The kernel is 5.15.32 - running Debian.
I initiate the following to put the unit to sleep:
$ echo mem > /sys/power/state
Then I activate the wake pin. The system starts to wake up.
Looks like the cursor appears, then it falls back asleep.

My question is, if anyone has seen something like this and has a quick idea what I am doing wrong? For example, is the power state driver not clearing the state after waking?

I realize this is way out of scope, so I am not expecting much.
Enclosed the log of why I see on the console.

Re: CPU waking from sleep returns to sleep.

Chavira — Tue, 22 Apr 2025 14:09:58 GMT

Hi @A_Guyula!

Thank you for contacting NXP Support!

What board are you using?

How you are configuring your device tree?

Re: CPU waking from sleep returns to sleep.

A_Guyula — Wed, 23 Apr 2025 17:37:27 GMT

We are using a Congatec SMARC board - conga-SMX8-Mini. It has 4 cores and 2Gigbytes of Ram.

I am using their variant of the 5.15.32 kernel source. The device tree is their standard device tree for this system with the addition of a modification to generate a spi device file.

I am just hoping someone knows an "a-ha" piece of information I can examine to fix this.

Re: CPU waking from sleep returns to sleep.

Chavira — Thu, 24 Apr 2025 19:08:28 GMT

Hi @A_Guyula!

Unfortunately the software provided for that board is custom and we can't replicate the issue.

Please contact to congatec support.