linux-kernel - Re: [PATCH 2/2] gpiolib-acpi: Don't set GPIOs for wakeup in S3 mode

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Message-ID: <CAHQZ30Aj-S1kRiYhh4sFzZYH8MLKY=sdqYRDqZtqOGGMn1Bang@mail.gmail.com>
Date:   Mon, 23 Jan 2023 10:54:29 -0700
From:   Raul Rangel <rrangel@...omium.org>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Bartosz Golaszewski <brgl@...ev.pl>,
        Mario Limonciello <mario.limonciello@....com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        Wolfram Sang <wsa@...nel.org>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Nathan Smythe <ncsmythe@...uboak.org>,
        linux-gpio@...r.kernel.org, linux-acpi@...r.kernel.org,
        linux-kernel@...r.kernel.org, Mark Hasemeyer <markhas@...omium.org>
Subject: Re: [PATCH 2/2] gpiolib-acpi: Don't set GPIOs for wakeup in S3 mode

On Mon, Jan 23, 2023 at 10:30 AM Andy Shevchenko
<andriy.shevchenko@...ux.intel.com> wrote:
>
> On Mon, Jan 23, 2023 at 08:55:02AM -0700, Raul Rangel wrote:
> > On Mon, Jan 23, 2023 at 8:03 AM Bartosz Golaszewski <brgl@...ev.pl> wrote:
> > >
> > > On Sat, Jan 21, 2023 at 2:48 PM Mario Limonciello
> > > <mario.limonciello@....com> wrote:
> > > >
> > > > commit 1796f808e4bb ("HID: i2c-hid: acpi: Stop setting wakeup_capable")
> > > > adjusted the policy to enable wakeup by default if the ACPI tables
> > > > indicated that a device was wake capable.
> > > >
> > > > It was reported however that this broke suspend on at least two System76
> > > > systems in S3 mode and two Lenovo Gen2a systems, but only with S3.
> > > > When the machines are set to s2idle, wakeup behaves properly.
> > > >
> > > > Configuring the GPIOs for wakeup with S3 doesn't work properly, so only
> > > > set it when the system supports low power idle.
> > > >
> > > > Fixes: 1796f808e4bb ("HID: i2c-hid: acpi: Stop setting wakeup_capable")
> > > > Fixes: b38f2d5d9615c ("i2c: acpi: Use ACPI wake capability bit to set wake_irq")
> > > > Link: https://gitlab.freedesktop.org/drm/amd/-/issues/2357
> > > > Link: https://bugzilla.redhat.com/show_bug.cgi?id=2162013
> > > > Reported-by: Nathan Smythe <ncsmythe@...uboak.org>
> > > > Tested-by: Nathan Smythe <ncsmythe@...uboak.org>
> > > > Suggested-by: Raul Rangel <rrangel@...omium.org>
> > > > Signed-off-by: Mario Limonciello <mario.limonciello@....com>
> > > > ---
> > > >  drivers/gpio/gpiolib-acpi.c | 3 ++-
> > > >  1 file changed, 2 insertions(+), 1 deletion(-)
> > > >
> > > > diff --git a/drivers/gpio/gpiolib-acpi.c b/drivers/gpio/gpiolib-acpi.c
> > > > index 9ef0f5641b521..17c53f484280f 100644
> > > > --- a/drivers/gpio/gpiolib-acpi.c
> > > > +++ b/drivers/gpio/gpiolib-acpi.c
> > > > @@ -1104,7 +1104,8 @@ int acpi_dev_gpio_irq_wake_get_by(struct acpi_device *adev, const char *name, in
> > > >                                 dev_dbg(&adev->dev, "IRQ %d already in use\n", irq);
> > > >                         }
> > > >
> > > > -                       if (wake_capable)
> > > > +                       /* avoid suspend issues with GPIOs when systems are using S3 */
> > > > +                       if (wake_capable && acpi_gbl_FADT.flags & ACPI_FADT_LOW_POWER_S0)
> > > >                                 *wake_capable = info.wake_capable;
> > > >
> > > >                         return irq;
> > > > --
> > > > 2.34.1
> > > >
> > >
> > > Applied, thanks!
> > >
> > > Bart
> >
> >
> > We still need to figure out a proper fix for this. If you read my post
> > here: https://gitlab.freedesktop.org/drm/amd/-/issues/2357#note_1732372
> > I think we misinterpreted what the SharedAndWake bit is used for. To
> > me it sounds like it's only valid for HW Reduced ACPI platforms, and
> > S0ix. My changes made it so we call `dev_pm_set_wake_irq` when the
> > Wake bit is set. Does anyone have any additional context on the Wake
> > bit? I think we either need to make `dev_pm_set_wake_irq` (or a
> > variant) only enable the wake on S0i3, or we can teach the ACPI
> > subsystem to manage arming the IRQ's wake bit. Kind of like we already
> > manage the GPE events for the device.
>
> From the spec:
>
> Shared is an optional argument and can be one of Shared, Exclusive,
> SharedAndWake or ExclusiveAndWake. If not specified, Exclusive is assumed.
> The “Wake” designation indicates that the interrupt is capable of waking
> the system from a low-power idle state or a system sleep state. The bit
> field name _SHR is automatically created to refer to this portion of
> the resource descriptor.
>
>
> Note: "...a low-power idle state or a system sleep state.". I believe it
> applies to both.

Without the _PRW, how do we determine the valid system sleep states
the device can wake the system from?

>
> --
> With Best Regards,
> Andy Shevchenko
>
>