Unintentional Wakeup by MCU

[berkayercancc]

Hi,

We are using i.MX 8QXP and having some issues with the behavior of the SCU_PMIC_STANDBY signal from the SCU in suspend. There seems to be a ~10 ms pulse on SCU_PMIC_STANDBY once every second that we need to handle to not wake up our system unintendently.

Is it possible to disable the pulse in some way? 
Is it possible to say how long the pulse can be in a worst case scenario? We need to know that in order to filter it out correctly.
We have had some issues reported from our customers that we think is related to this.

There is a thread on the forum where this issue has been discussed,
https://community.nxp.com/t5/i-MX-Processors/iMX8QXP-SCU-wakes-up-once-a-second-during-suspend/m-p/1...

Kind Regards,
Berkay

[berkayercancc]

According to the feedback I got from the team, we're using C0 revisions. Sorry for the confusion. Is the case still the same for C0 revs?

If so, what's the maximum duration of this pulse? We can arrange our filters according to that.

Kind Regards,
Berkay

[jimmychan]

The PMIC_STANDBY exits every second to feed SECO's watchdog. If not doing this, the chip will be reset. This design is for security. So it can't be removed. i.MX8QM B0 and i.MX8QXP B0 require this 1 second period to poll the ON/OFF button in addition to servicing the watchdog.

[berkayercancc]

Hi,

We're using customized kernel which is based on "lf-5.15.y" version linux-imx kernel. And iMX8QXP PIMX8QX6AVLFZAB chip.

Kind Regards,
Berkay

[jimmychan]

Which version of chip are you using?

Which version of BSP are you using?