linux-kernel - Re: [PATCH v2 07/13] i2c: acpi: Use ACPI wake capability bit to set wake

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Date:   Tue, 13 Sep 2022 09:51:48 -0600
From:   Raul Rangel <rrangel@...omium.org>
To:     Wolfram Sang <wsa@...nel.org>,
        Raul E Rangel <rrangel@...omium.org>,
        Linux ACPI <linux-acpi@...r.kernel.org>,
        linux-input <linux-input@...r.kernel.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        "jingle.wu" <jingle.wu@....com.tw>,
        "Limonciello, Mario" <mario.limonciello@....com>,
        Tim Van Patten <timvp@...gle.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Hans de Goede <hdegoede@...hat.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        "open list:I2C SUBSYSTEM HOST DRIVERS" <linux-i2c@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 07/13] i2c: acpi: Use ACPI wake capability bit to set wake_irq

On Tue, Sep 13, 2022 at 1:28 AM Wolfram Sang <wsa@...nel.org> wrote:
>
> On Mon, Sep 12, 2022 at 04:13:11PM -0600, Raul E Rangel wrote:
> > Device tree already has a mechanism to pass the wake_irq. It does this
> > by looking for the wakeup-source property and setting the
> > I2C_CLIENT_WAKE flag. This CL adds the ACPI equivalent. It uses the
> > ACPI interrupt wake flag to determine if the interrupt can be used to
> > wake the system. Previously the i2c drivers had to make assumptions and
> > blindly enable the wake IRQ. This can cause spurious wake events. e.g.,
> > If there is a device with an Active Low interrupt and the device gets
> > powered off while suspending, the interrupt line will go low since it's
> > no longer powered and wakes the system. For this reason we should
> > respect the board designers wishes and honor the wake bit defined on the
> > interrupt.
>
> I'll let the I2C ACPI maintainers deal with the technical details
> because they are the experts here, yet one minor thing hits my eye:
>

> > +             irq_ctx.irq = acpi_dev_gpio_irq_get_wake(
> > +                     adev, 0, &irq_ctx.wake_capable);
>
> That line split looks weird with the open parens at the end of line 1.
>
Ah, looks like I missed `clang-format` on that line. I can fix it in
the next revision.

Thanks