Re: [PATCH] Input: i8042 - add quirk for Lenovo ThinkPad T14 Gen 1

From: Jonathan Denose <jdenose@chromium.org>
To: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Cc: linux-input@vger.kernel.org, Jonathan Denose <jdenose@google.com>,
	 Hans de Goede <hdegoede@redhat.com>,
	Huacai Chen <chenhuacai@kernel.org>,
	 Mattijs Korpershoek <mkorpershoek@baylibre.com>,
	Takashi Iwai <tiwai@suse.de>,
	 Werner Sembach <wse@tuxedocomputers.com>,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH] Input: i8042 - add quirk for Lenovo ThinkPad T14 Gen 1
Date: Mon, 8 Jan 2024 10:36:34 -0600	[thread overview]
Message-ID: <CALNJtpX3Yb=tzGYMwr6He27hc-MYjfwWtm4_LuhLThOfat_jiA@mail.gmail.com> (raw)
In-Reply-To: <CALNJtpUHHaq6g0wSuyaNBxtOE9kt6vDzdAGGu6j=JJdJmerDWQ@mail.gmail.com>

Hi all,

On Mon, Nov 27, 2023 at 10:38 AM Jonathan Denose <jdenose@chromium.org> wrote:
>
> Hi Dmitry
>
> On Fri, Nov 24, 2023 at 10:45 PM Dmitry Torokhov
> <dmitry.torokhov@gmail.com> wrote:
> >
> > Hi Jonathan,
> >
> > On Mon, Sep 25, 2023 at 04:33:20PM -0500, Jonathan Denose wrote:
> > > The ThinkPad T14 Gen 1 touchpad works fine except that clicking
> > > and dragging by tapping the touchpad or depressing the touchpad
> > > do not work. Disabling PNP for controller setting discovery enables
> > > click and drag without negatively impacting other touchpad features.
> >
> > I would like to understand more on how enabling PnP discovery for i8042
> > affects the touchpad. Do you see it using different interrupt or IO
> > ports? What protocol does the touchpad use with/without PnP? If the
> > protocol is the same, do you see difference in the ranges (pressure,
> > etc) reported by the device?
> >
> > Thanks.
> >
> > --
> > Dmitry
>
> Without PnP discovery the touchpad is using the SynPS/2 protocol, with
> PnP discovery, the touchpad is using the rmi4 protocol. Since the
> protocols are different, so are the ranges but let me know if you
> still want to see them.
>
> Can you tell me how to check the interrupt/IO ports? I'm not sure how
> to do that.
>
> Thanks,
> Jonathan

Do you require any more information from me?

Thanks,
Jonathan