[Linux-kernel-mentees] Any other ways to debug GPIO interrupt controller (pinctrl-amd) for broken touchpads of a new laptop model?

[Hans de Goede]

Hi,

On 10/2/20 4:51 PM, Coiby Xu wrote:
> On Fri, Oct 02, 2020 at 03:36:29PM +0200, Hans de Goede wrote:

<snip>

>>>> So are you seeing these 7 interrupts / second for the touchpad irq or for
>>>> the GPIO controllers parent irq ?
>>>>
>>>> Also to these 7 interrupts/sec stop happening when you do not touch the
>>>> touchpad ?
>>>>
>>> I see these 7 interrupts / second for the GPIO controller's parent irq.
>>> And they stop happening when I don't touch the touchpad.
>>
>> Only from the parent irq, or also on the touchpad irq itself ?
>>
>> If this only happens on the parent irq, then I would start looking at the
>> amd-pinctrl code which determines which of its "child" irqs to fire.
> 
> This only happens on the parent irq. The input's pin#130 of the GIPO
> chip is low most of the time and pin#130.

Right, but it is a low-level triggered IRQ, so when it is low it should
be executing the i2c-hid interrupt-handler. If it is not executing that
then it is time to look at amd-pinctrl's irq-handler and figure out why
that is not triggering the child irq handler for the touchpad.

Regards,

Hans