i2c problems during wakeup frum suspend

[RRD101]

A question for the experts out there.
I have a circuit in which several push-button switches are connected to a GPIO expander. My current system is based on an IMX8MP, to which this GPIO expander is connected via I²C. This expander has an interrupt line to the IMX8MP. Often, when I put the system into suspend mode and press one of the push buttons (the expander is also marked as a wake-up source in the device tree), I receive this message hundreds or even thousands of times as soon as the system comes out of suspend: [ 117.113106] pca953x 3-0076: failed reading register. I know there was already a patch for a similar issue in the i2c-imx.c driver, and I’ve applied it. However, it isn’t having the desired effect. What can I do about this? P.S. It doesn’t happen all the time, but it can be reproduced relatively quickly.

Best regards R.

[Zhiming_Liu]

Hi @RRD101 

Based on your description, it seems like you could try this commit. Also, which kernel version are you using?



Best Regards,
Zhiming

[RRD101]

I use Kernel Version 6.6.23