GPIO3 PEE.04 not working after system resume

[michtw]

I am using L4T 35.5 with Jetson Orin Nano.
We have designed a power button on the custom carrier board using GPIO3 PEE.04.
The power button worked well and I can see interrupts increased by pressing the power button as well as pop-up Power Off window.

$ sudo cat /proc/interrupts | grep power-key
293: 2 2 0 0 0 0 gpio 27 Edge power-key

But after the system resumes from suspend when power button pressed I can’t get GPIO interrupt and Power Off window anymore.

The GPIO PEE.04 setting in device tree is following (in Linux_for_Tegra/source/public/hardware/nvidia/platform/t23x/p3768/kernel-dts/cvb/tegra234-p3768-0000-a0.dtsi)

gpio-keys {
        compatible = "gpio-keys";
        gpio-keys,name = "gpio-keys";
        status = "okay";

        forcerecovery {
                label = "force-recovery";
                gpios = <&tegra_main_gpio TEGRA234_MAIN_GPIO(G, 0) GPIO_ACTIVE_LOW>;
                linux,code = <BTN_1>;
        };  

        power_key {
                label = "power-key";
                gpios = <&tegra_aon_gpio TEGRA234_AON_GPIO(EE, 4) GPIO_ACTIVE_LOW>;
                linux,code = <KEY_POWER>;
                gpio-key,wakeup;
        };  
};

How to get the GPIO3 PEE.04 working after resume?
Thanks.

[DaveYYY]

Does it work if you wire the power button to a DevKit board with the same GPIO pins?

[michtw]

Sorry, I cannot do it because I don’t have a dev kit on hand.

[DaveYYY]

Then do pins other than EE.04 work?
Does dmesg show anythig after the operation?

[DaveYYY]

Hi,

It’s a known issue in SC7 binary that has been fixed internally, please wait for the next public release.
As a workaround for now, you can manually modify the register after resume to enable interrupt:

This is the normal status before suspend:

root@tegra-ubuntu:/home/nvidia# busybox devmem 0x0c2f1080
0x000000ED

This is the abnormal one after suspend:

root@tegra-ubuntu:/home/nvidia# busybox devmem 0x0c2f1080
0x00000001

So please write 0x000000ED back to 0x0c2f1080 after resume to fix it.