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Date:      Wed, 11 Sep 2019 22:35:47 +0000
From:      bugzilla-noreply@freebsd.org
To:        bugs@FreeBSD.org
Subject:   [Bug 240339] [ig4] I2C2 (touchpad bus) broken on the Google Pixelbook (Sunrise Point PCH)
Message-ID:  <bug-240339-227-ruyiRfgpxe@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-240339-227@https.bugs.freebsd.org/bugzilla/>
References:  <bug-240339-227@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D240339

--- Comment #15 from Vladimir Kondratyev <wulf@freebsd.org> ---
(In reply to Greg V from comment #12)
> I think I found the culprit, it's the length retrieval in get_input_repor=
t. I changed it to just trust the given length =E2=80=94 touchscreen works,
That sounds strange. Length retrieval breaks read pipelining, but I dont th=
ink
it can result in such an errors.

> err, actually, it's the thing where it writes the wInputRegister, which I=
 don't think is supposed to happen.
Write into wInputRegister can't result in any immediate errors as it is jus=
t a
write into controller's FIFO.

// and it's currently reading mouse reports.. I'll try to fix this.
imt_set_input_mode() is responsible for converting mouse to touchpad

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