On Tue, Oct 19, 2021 at 12:05 AM Shreeya Patel
[off-list ref] wrote:

We are racing the registering of .to_irq when probing the
i2c driver. This results in random failure of touchscreen
devices.

Following errors could be seen in dmesg logs when gc->to_irq is NULL

[2.101857] i2c_hid i2c-FTS3528:00: HID over i2c has not been provided an Int IRQ
[2.101953] i2c_hid: probe of i2c-FTS3528:00 failed with error -22

To avoid this situation, defer probing until to_irq is registered.

This issue has been reported many times in past and people have been
using workarounds like changing the pinctrl_amd to built-in instead
of loading it as a module or by adding a softdep for pinctrl_amd into
the config file.

References :-
https://bugzilla.kernel.org/show_bug.cgi?id=209413
https://github.com/Syniurge/i2c-amd-mp2/issues/3

Signed-off-by: Shreeya Patel <redacted>

---
Changes in v2
  - Add a condition to check for irq chip to avoid bogus error.

This v2 looks acceptable to me.
Reviewed-by: Linus Walleij <redacted>

Yours,
Linus Walleij