Re: [PATCH 0/8] acpi: i2c: Use SharedAndWake and ExclusiveAndWake to enable wake irq

Raul Rangel
2022-08-31T14:37:41Z

Interesting... The patch series is here:
https://patchwork.kernel.org/project/linux-input/cover/20220830231541.1135813-1-rrangel@chromium.org/

I'll look into why you only got added to 2 of the emails.

On Wed, Aug 31, 2022 at 5:52 AM Andy Shevchenko
<andriy.shevchenko@linux.intel.com> wrote:
>
> On Tue, Aug 30, 2022 at 05:15:33PM -0600, Raul E Rangel wrote:
> > Today, i2c drivers are making the assumption that their IRQs can also
> > be used as wake IRQs. This isn't always the case and it can lead to
> > spurious wakes. This has recently started to affect AMD Chromebooks.
> > With the introduction of
> > d62bd5ce12d7 ("pinctrl: amd: Implement irq_set_wake"), the AMD GPIO
> > controller gained the capability to set the wake bit on each GPIO. The
> > ACPI specification defines two ways to inform the system if a device is
> > wake capable:
> > 1) The _PRW object defines the GPE that can be used to wake the system.
> > 2) Setting ExclusiveAndWake or SharedAndWake in the _CRS GpioInt.
> >
> > Currently only the first method is supported. The i2c drivers don't have
> > any indication that the IRQ is wake capable, so they guess. This causes
> > spurious interrupts, for example:
> > * We have an ACPI HID device that has `_PR0` and `_PR3`. It doesn't have
> > `_PRW` or `ExclusiveAndWake` so that means the device can't wake the
> > system.
> > * The IRQ line is active level low for this device and is pulled up by
> > the power resource defined in `_PR0`/`_PR3`.
> > * The i2c driver will (incorrectly) arm the GPIO for wake by calling
> > `enable_irq_wake` as part of its suspend hook.
> > * ACPI will power down the device since it doesn't have a wake GPE
> > associated with it.
> > * When the device is powered down, the IRQ line will drop, and it will
> > trigger a wake event.
> >
> > See the following debug log:
> > [ 42.335804] PM: Suspending system (s2idle)
> > [ 42.340186] amd_gpio AMD0030:00: RX: Setting wake for pin 89 to enable
> > [ 42.467736] power-0416 __acpi_power_off : Power resource [PR00] turned off
> > [ 42.467739] device_pm-0280 device_set_power : Device [H05D] transitioned to D3cold
> > [ 42.475210] PM: pm_system_irq_wakeup: 11 triggered pinctrl_amd
> > [ 42.535293] PM: Wakeup unrelated to ACPI SCI
> > [ 42.535294] PM: resume from suspend-to-idle
> >
> > In order to fix this, we need to take into account the wake capable bit
> > defined on the GpioInt. This is accomplished by:
> > * Migrating some of the i2c drivers over to using the PM subsystem to
> > manage the wake IRQ. max8925-i2c, elants_i2c, and raydium_i2c_ts still
> > need to be migrated, I can do that depending on the feedback to this
> > patch series.
> > * Expose the wake_capable bit from the ACPI GpioInt resource to the
> > i2c core.
> > * Use the wake_capable bit in the i2c core to call
> > `dev_pm_set_wake_irq`. This reuses the existing device tree flow.
> > * Make the i2c drivers stop calling `dev_pm_set_wake_irq` since it's now
> > handled by the i2c core.
> > * Make the ACPI device PM system aware of the wake_irq. This is
> > necessary so the device doesn't incorrectly get powered down when a
> > wake_irq is enabled.
> >
> > I've tested this code with various combinations of having _PRW,
> > ExclusiveAndWake and power resources all defined or not defined, but it
> > would be great if others could test this out on their hardware.
>
> I have got only cover letter and a single patch (#3). What's going on?
>
> Note: I'm also reviewer of I涎 DesignWare driver, you really have to
> fix your tools / submission process and try again. No review for this
> series.
>
> --
> With Best Regards,
> Andy Shevchenko
>
>