Re: [PATCH v3 0/1] i2c: designware: fix probe ordering for AMD GPIO on Lenovo Yoga 7 14AGP11

[Andy Shevchenko <andriy.shevchenko@intel.com>]

On Fri, May 15, 2026 at 09:45:15PM +0530, Hardik Prakash wrote:
> The Wacom WACF2200 touchscreen on the Lenovo Yoga 7 14AGP11 (83TD) is
> non-functional on Linux due to two bugs. Patch 1 (pinctrl-amd GPIO IRQ
> fix) has already been taken into Linus Walleij's tree. This v3 resend
> covers patch 2 only, addressing Andy Shevchenko's formatting feedback.
> 
> Root cause: i2c_designware probes AMDI0010:02 before pinctrl-amd's
> probe completes, so GPIO 157 (WACF2200 GpioInt per ACPI _CRS) has its
> interrupt bits cleared when the first I2C transaction is attempted,
> causing lost arbitration errors. The udev rebind workaround (which
> works because pinctrl-amd has finished by userspace time) confirms
> probe ordering as the root cause.
> 
> Note: the dual-master hypothesis raised by Mario Limonciello was
> investigated. TPNL's _DSM (UUID 3cdff6f7-4267-4555-ad05-b30a3d8938de)
> is a pure query method returning a constant HID descriptor address with
> no side effects, making firmware acting as secondary I2C master unlikely
> on this hardware. Awaiting Mario and Bart's technical verdict before
> any further approach changes.
> 
> v3:
>  - Patch 2 only (patch 1 already in Linus Walleij's tree)

The patch numbering is broken. Where did 2/2 come from?

-- 
With Best Regards,
Andy Shevchenko