Re: [PATCH] i2c: qcom-geni: restore tSCL with 32MHz I2C fast-mode

[Birk Skyum]

On Tue, 29 Sep 2026 12:14:43 +0800, Daniel J Blueman wrote:
> With this change, t_high_cnt 3 and clk_div 4 gave a tSCL of 375ns
> versus the previous default of 521ns, however the I2C spec has a
> minimum tSCL of 600ns.
>
> Restore tSCL to the spec with t_high_cnt 5 giving a 625ns tSCL,
> verified on Lenovo Yoga Slim 7x X1E-80100.

This fixes it on another Yoga Slim 7x (83ED).

I took a distribution build of 7.2.8 that works on this laptop and
replaced only i2c-qcom-geni.ko, built from the same tree:

  7.2.8 driver                   keyboard works
  7.2.9 driver                   keyboard and touchpad dead
  7.2.9 driver with this patch   keyboard, touchpad, touchscreen work

With the patch the keyboard takes the disk passphrase in the initramfs
again. The five I2C controllers in use run from the 32 MHz clock, as
they do without it, and the log has no error from geni_i2c or
i2c_hid_of. That is one boot.

Tested-by: Birk Skyum <birk.skyum@xxxxx> # Lenovo Yoga Slim 7x

Thanks,
Birk