Re: [PATCH v1 3/3] gpio: pca953x: Set IRQ type when handle Intel Galileo Gen 2

[Linus Walleij <linus.walleij@xxxxxxxxxx>]

On Thu, Feb 25, 2021 at 5:33 PM Andy Shevchenko
<andriy.shevchenko@xxxxxxxxxxxxxxx> wrote:

> The commit 0ea683931adb ("gpio: dwapb: Convert driver to using the
> GPIO-lib-based IRQ-chip") indeliberately made a regression on how
> IRQ line from GPIO I²C expander is handled. I.e. it reveals that
> the quirk for Intel Galileo Gen 2 misses the part of setting IRQ type
> which previously was predefined by gpio-dwapb driver. Now, we have to
> reorganize the approach to call necessary parts, which can be done via
> ACPI_GPIO_QUIRK_ABSOLUTE_NUMBER quirk.
>
> Without this fix and with above mentioned change the kernel hangs
> on the first IRQ event with:
>
>     gpio gpiochip3: Persistence not supported for GPIO 1
>     irq 32, desc: 62f8fb50, depth: 0, count: 0, unhandled: 0
>     ->handle_irq():  41c7b0ab, handle_bad_irq+0x0/0x40
>     ->irq_data.chip(): e03f1e72, 0xc2539218
>     ->action(): 0ecc7e6f
>     ->action->handler(): 8a3db21e, irq_default_primary_handler+0x0/0x10
>        IRQ_NOPROBE set
>     unexpected IRQ trap at vector 20
>
> Fixes: ba8c90c61847 ("gpio: pca953x: Override IRQ for one of the expanders on Galileo Gen 2")
> Depends-on: 0ea683931adb ("gpio: dwapb: Convert driver to using the GPIO-lib-based IRQ-chip")

I never saw that before, seems useful!

> Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>

Not only does it fix the bug, it also looks so much better by
separation of concerns.
Reviewed-by: Linus Walleij <linus.walleij@xxxxxxxxxx>

Yours,
Linus Walleij