TDA4VM: SOC awake from Standby

Hi,

The above code is NOT sufficient to register interrupts. Where have you done do_request_irq? Which driver is using the main_gpio1 13th pin?

Here is an FAQ that describes how to test GPIO interrupts: https://e2e.ti.com/support/processors/f/791/t/1058595

Best Regards,
Keerthy

Hello Keerthy,

Thanks for the reply.

I dont see any API with "do_request_irq", do you mean "devm_request_irq"?

For now we dont have any driver for this, we are writing a dummy driver for this.

The FAQ page you have mentioned seems to expired, can you please provide valid page?

Does this GPIO number will be considered as interrupts number?

Prasad Pallapu said:

I dont see any API with "do_request_irq", do you mean "devm_request_irq"?

Yes. Please have that dummy driver without which you will not see an entry on /proc/interrupts.

Prasad Pallapu said:

The FAQ page you have mentioned seems to expired, can you please provide valid page?

I will get back with a proper link on this.

Best Regards,
Keerthy

Hello Keerthy,

Now we are able to register GPIO as interrupt with below code.

&main_gpio0 {

        pinctrl-names = "default";

        pinctrl-0 = <&gpio_pins_intr>;   

    compatible = "ti, gpio-test";

    interrupt-names = "gpio-test";

    interrupts = <&main_gpio0 38 IRQ_TYPE_LEVEL_HIGH>;

};

irq = platform_get_irq(pdev, 0);
printk ("pp: IRQ Line is %d \n",irq);

errno = request_irq( irq, (irq_handler_t)irq_handler, 0, "gpio-test", ddata );

if ( errno < 0) {
     printk(KERN_INFO "pp: Problem requesting IRQ, error %i\n", errno);
     return -EINVAL;
}

cat /proc/interrupts:

 44:          0          0      INTR  83 Edge      gpio-test

But unfortunately we are not getting the interrupts getting triggered.

Is there any other changes required apart from above mentioned changes like configuring GPIOMUX_INTRTR0_MUXCNTL_n register?

If yes, as my GPIO is 38, can i configure ENABLE field as 38? And what could be the value of "n" for the offset? can i use any number between 0 to 3F?

I could not find anywhere in TRM about mapping of input interrupts(M) to output interrupts (N)

Another question is we are configuring the IRQ type as "LEVEL" but its registering as "EDGE", does it has any impact? how do i make it to LEVEL?

hi Keerthy,

It seems i dont have permission to patch file mentioned in the FAQ

Below is the error

"You do not have permission to view this directory or page".

Hello Keerthy,

As per your patch, we are able to register GPIO interrupt as below

352:          1          0      GPIO  38 Edge    -davinci_gpio  key-gpio

When we trigger the interrupt from user space with GPIO export, we can able to generate the interrupt, but when we generate the interrupt from boot switch (toggle) we dont see any interrupt.

Do you feel we are missing anything else?

Note: We are using custom board and GPIO0_38 is the GPIO registered as interrupt

Hello Keerthy,

Also, i hope we need to clear this interrupt, if yes how we can clear this interrupt?

Hi Keerthy,

After some modification in the custom HW, we could able to get the interrupts from bootswitch.

But after we perform "echo freeze > /sys/power/state" to transition the A72 to idle, and perform bootswitch toggle, we dont see any wakeup of A72.

We are not sure if WFI is triggered or not.

Can you guide us where we can check to understand if A72 wakeup is started?

Hi Keerthy,

Thanks for the help.

If anything else required will raise a new ticket.