topic Re: touch as a wakeup source in i.MX Processors

touch as a wakeup source

DEEPIKA19 — Wed, 28 Dec 2022 09:10:04 GMT

Hi team,

I am using goodix touch display with imx8mp processor.

I would like to set touch screen a wakeup-source.
I am entering suspend mode using the below command from the terminal:

$ echo mem >/sys/power/state

In the dts I have added the below line under goodix node

wakeup-source;

But touch did not act as wakeup source.

The board was still in suspend mode even after trying to wake the board by touching the display screen.

Is there any driver change needed apart from the dts change?
If any driver change need could you give a reference for the same.

Please could you help me with this issue.

Regards,

Deepika

Re: touch as a wakeup source

DEEPIKA19 — Thu, 29 Dec 2022 05:41:27 GMT

Hi team ,

Could someone help me on this........

Regards

Deepika

Re: touch as a wakeup source

DEEPIKA19 — Mon, 02 Jan 2023 06:40:45 GMT

Hi team ,

I observed that when suspend command is issued, no logs are obtained on the debug console.

eg : prints like "suspend entry, Freezing user space processes" are expected but I don't see any such log on my console.

Could you guide me to debug this issue.

Regards

Deepika

Re: touch as a wakeup source

Dhruvit — Mon, 02 Jan 2023 08:33:54 GMT

Hi @DEEPIKA19,

Are you able to wake up from gpio interrupt? Please Try using sysfs entry for gpio to enable wakeup from suspend for debugging

Are you able to track interrupts from the touchscreen in # cat /proc/interrupts?

Please add device_init_wakeup(&client->dev, 1); in the probe function of the driver.

One can refer to drivers/input/touchscreen/edt-ft5x06.c for example.

Please share the device tree source file and suspend logs for further debugging.

Thanks & Regards,
Dhruvit.

Re: touch as a wakeup source

Dhruvit — Tue, 03 Jan 2023 07:51:27 GMT

Hi @DEEPIKA19,

Please make sure that you have set the kernel console log level set to the highest as below.

# echo 7 > /proc/sys/kernel/print

Please mention the BSP version that you are using.

Thanks & Regards,
Dhruvit.

Re: touch as a wakeup source

DEEPIKA19 — Tue, 03 Jan 2023 08:39:48 GMT

Thanks @Dhruvit ,

Will test the board with your recommendations and revert back soon.

Regards,

Deepika