[Bug 240339] [ig4] I2C2 (touchpad bus) broken on the Google Pixelbook (Sunrise Point PCH)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=240339

--- Comment #14 from Vladimir Kondratyev <wulf at freebsd.org> ---
(In reply to Greg V from comment #12)
> Seems like ig4 is innocent
Not so innocent. You are at least 5-th man who has tried iichid and has bitten
by SDA_HOLD issue. Can you check and post here the value of this register right
after IG4_REG_RESETS_SKL is written. In my case it is 0x00000001 which is too
low to allow normal I2C operation.
I think setting SDA_HOLD to 28 is a good candidate to be committed just now
with the aim to be MFC-ed before 12.1 branch is forked.

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