linux-kernel - Re: [PATCH v2] pinctrl: amd: Fix wakeups when IRQ is shared with SCI

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Date:   Tue, 19 Oct 2021 13:04:21 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Mario Limonciello <mario.limonciello@....com>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Basavaraj Natikar <Basavaraj.Natikar@....com>,
        Shyam Sundar S K <Shyam-sundar.S-k@....com>,
        "open list:PIN CONTROL SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        Nehal Shah <Nehal-bakulchandra.Shah@....com>,
        "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Joerie de Gram <j.de.gram@...il.com>
Subject: Re: [PATCH v2] pinctrl: amd: Fix wakeups when IRQ is shared with SCI

On Tue, Oct 19, 2021 at 6:27 AM Mario Limonciello
<mario.limonciello@....com> wrote:
>
> On some Lenovo AMD Gen2 platforms the IRQ for the SCI and pinctrl drivers
> are shared.  Due to how the s2idle loop handling works, this case needs
> an extra explicit check whether the interrupt was caused by SCI or by
> the GPIO controller.
>
> To fix this rework the existing IRQ handler function to function as a
> checker and an IRQ handler depending on the calling arguments.
>
> BugLink: https://gitlab.freedesktop.org/drm/amd/-/issues/1738

Should it have a Fixes tag?

> Reported-by: Joerie de Gram <j.de.gram@...il.com>
> Signed-off-by: Mario Limonciello <mario.limonciello@....com>

...

> +#ifdef CONFIG_ACPI

__maybe_unused?

> +static bool amd_gpio_check_wake(void *dev_id)
> +{
> +       return _amd_gpio_irq_handler(-1, dev_id);
> +}
> +#endif

...

> +#ifdef CONFIG_ACPI
> +       acpi_register_wakeup_handler(gpio_dev->irq, amd_gpio_check_wake, gpio_dev);
> +#endif

Not what I expected.

...

> +#ifdef CONFIG_ACPI
> +       acpi_unregister_wakeup_handler(amd_gpio_check_wake, gpio_dev);
> +#endif

Ditto.

Yes, I see the problem, perhaps you need to add the stubs. If this is
a real regression fix, then probably this patch should follow by two:
adding stubs, removing ugly ifdeffery here. Otherwise, introduce stubs
as patch 1 preceding this one in a series.

-- 
With Best Regards,
Andy Shevchenko