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Problem with wakeup from sleep with GPIO

Question asked by Gerald Heinig on Oct 12, 2017
Latest reply on Oct 12, 2017 by igorpadykov

Hello,

I have a Linux kernel with version 4.1.15-1.2.0 running on a custom board that is very similar to the iMX6DL Sabre.

I am trying to get the system to wake up from standby and suspend-to-ram mode using GPIOs.

This works for GPIO2 and GPIO9 (gpio1 IO2 and gpio1 IO9) but does *not* work for GPIO203 and GPIO204 (gpio7 IO11 and gpio7 IO12).

When I export the gpios under sysfs and activate the edge-triggered interrupts (echo falling > edge), I can see the value change when I examine the 'value' file and I can also see the interrupts getting triggered when I examine /proc/interrupts.

So,

a) the GPIO is seeing a change and is reflecting the changed value

b) is triggering an interrupt according to the change.

However, this does *not* wake the system up for GPIO203 and GPIO204.

This *does* work for GPIO2 and GPIO9.

 

It seems that some irq wakeup flag is set for GPIO2 and GPIO9 and is not set for GPIO203 and GPIO204.

 

Does anyone know what I'm doing wrong?

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