linux-kernel - 4.1 touchscreen regression on n900 -- pinpointed [was Re: linux-n900 v4.1-rc4]

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Message-ID: <20150529190816.GA20232@amd>
Date:	Fri, 29 May 2015 21:08:16 +0200
From:	Pavel Machek <pavel@....cz>
To:	Sebastian Reichel <sre@...nel.org>,
	kernel list <linux-kernel@...r.kernel.org>,
	maxime.ripard@...e-electrons.com, dmitry.torokhov@...il.com
Cc:	Pali Rohár <pali.rohar@...il.com>,
	Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>
Subject: 4.1 touchscreen regression on n900 -- pinpointed [was Re: linux-n900
 v4.1-rc4]

Hi!

> mh I remember having problems with tsc2005 before. It helped to
> reset the controller (should actually happen automatically when it
> hangs, but I'm not sure, that it actually works).

Ok, I did some more testing, and found out rather bogus values in
evtest:

Input device name: "TSC2005 touchscreen"
Supported events:
  Event type 0 (EV_SYN)
  Event type 1 (EV_KEY)
  Event code 330 (BTN_TOUCH)
  Event type 3 (EV_ABS)
  Event code 0 (ABS_X)
  Value   2514
 Min        0
 Max        0
 Fuzz       4

Which made me go through the git logs, and these patches looked
suspicious. After a revert... yes, touchscreen works as well as it
worked before.

0a363a380954e10fece7cd9931b66056eeb07d56
3eea8b5d68c801fec788b411582b803463834752

(It is impossible to revert just 3eea..)

Its funny... changelog complains about duplicated code.. then inserts
30 lines of code. Along with check that was not there before.

Maxime, can you suggest a fix?
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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