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From: Linus Walleij <linus.walleij@linaro.org>
To: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Bartosz Golaszewski <bgolaszewski@baylibre.com>,
	Mika Westerberg <mika.westerberg@linux.intel.com>,
	"open list:GPIO SUBSYSTEM" <linux-gpio@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	ACPI Devel Maling List <linux-acpi@vger.kernel.org>,
	"Rafael J. Wysocki" <rjw@rjwysocki.net>,
	Len Brown <lenb@kernel.org>
Subject: Re: [PATCH v1 3/3] gpio: pca953x: Set IRQ type when handle Intel Galileo Gen 2
Date: Tue, 2 Mar 2021 15:52:37 +0100	[thread overview]
Message-ID: <CACRpkdbeYkQiUjb0t2XWik1j1qQTUZZVyjkASMgpE24DWLx0fQ@mail.gmail.com> (raw)
In-Reply-To: <20210225163320.71267-4-andriy.shevchenko@linux.intel.com>

On Thu, Feb 25, 2021 at 5:33 PM Andy Shevchenko
<andriy.shevchenko@linux.intel.com> 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@linux.intel.com>

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

Yours,
Linus Walleij

      reply	other threads:[~2021-03-02 21:21 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-25 16:33 [PATCH v1 0/3] gpio: pca953x: Better quirk for Intel Galileo Gen 2 Andy Shevchenko
2021-02-25 16:33 ` [PATCH v1 1/3] gpiolib: acpi: Add ACPI_GPIO_QUIRK_ABSOLUTE_NUMBER quirk Andy Shevchenko
2021-03-02 14:48   ` Linus Walleij
2021-03-02 15:09     ` Andy Shevchenko
2021-03-02 15:14       ` Mika Westerberg
2021-03-02 15:21         ` Andy Shevchenko
2021-03-02 16:07           ` Bartosz Golaszewski
2021-03-02 16:35             ` Andy Shevchenko
2021-02-25 16:33 ` [PATCH v1 2/3] gpiolib: acpi: Allow to find GpioInt() resource by name and index Andy Shevchenko
2021-03-02 14:49   ` Linus Walleij
2021-02-25 16:33 ` [PATCH v1 3/3] gpio: pca953x: Set IRQ type when handle Intel Galileo Gen 2 Andy Shevchenko
2021-03-02 14:52   ` Linus Walleij [this message]

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