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Question, i.MX6Q IRQ handling(Linux)

Question asked by Masamichi Miyamoto on Oct 29, 2017
Latest reply on Nov 1, 2017 by Masamichi Miyamoto

Dear team,


I would like to ask about IRQ of i.MX6 on Linux.

Now my customer is using GPIO (GPIO(1,30)) of i.MX6Q as IRQ input on Linux(3.14.28).

And they saw IRQ#190 is used for that. They found that from the result of issuing “cat /proc/interrupts” command.

Because they want to assign the IRQ#190 into other CPU core, CPU-1, they issued “echo 2> /proc/irq/190/smp_affinity”.

Then error occurred as below.

-sh : echo : write error : Input/output error

They feel the IRQ#190 might be incorrect.

Please show me how to assign the IRQ to other CPU core.

And please show us how to change the priority of IRQ also.