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From: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Date: Thu, 21 Jul 2016 17:57:55 -0700
Message-ID: <CAKdAkRSYxM0_JOD-fR_n49PFxPUbZbVZ4nDqhgzm=HzCb8FQHg@mail.gmail.com>
Subject: Re: v4.1 to v4.7: regression in tsc2005 driver
To: Peter Hutterer <peter.hutterer@who-t.net>
Cc: Pavel Machek <pavel@ucw.cz>, Michael Welling <mwelling@ieee.org>,
        kernel list <linux-kernel@vger.kernel.org>,
        "linux-input@vger.kernel.org" <linux-input@vger.kernel.org>,
        =?UTF-8?Q?Pali_Roh=C3=A1r?= <pali.rohar@gmail.com>,
        Sebastian Reichel <sre@kernel.org>,
        "aaro.koskinen@iki.fi" <aaro.koskinen@iki.fi>,
        Ivaylo Dimitrov <ivo.g.dimitrov.75@gmail.com>,
        Patrik Bachan <patrikbachan@gmail.com>, serge@hallyn.com
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On Thu, Jul 21, 2016 at 5:10 PM, Peter Hutterer
<peter.hutterer@who-t.net> wrote:
> On Thu, Jul 21, 2016 at 10:54:21AM +0200, Pavel Machek wrote:
>> Should we have calibration info in the device tree, with kernel
>> passing it to the x?
>>
>> Should kernel somehow do the calibration itself?
>
> if the kernel knows about the calibration it would make more sense to just
> do it in the kernel directly.

Historically we relied on userspace to perform
calibration/transformation. Lately we've been introducing trivial
transformations (inversion and axes swapping) and we allow plumbing
this though DT; the rest I think is still better done in userspace
(where you can do floating point, if desired).

> but for anything even remotely run-time or
> user-configured the xorg.conf snippet is the best solution.

Thanks.

-- 
Dmitry