From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751937AbZHIKk0 (ORCPT ); Sun, 9 Aug 2009 06:40:26 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751438AbZHIKkZ (ORCPT ); Sun, 9 Aug 2009 06:40:25 -0400 Received: from ns.penguin.cz ([84.21.108.25]:49326 "EHLO ns.penguin.cz" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751211AbZHIKkY (ORCPT ); Sun, 9 Aug 2009 06:40:24 -0400 X-Greylist: delayed 1114 seconds by postgrey-1.27 at vger.kernel.org; Sun, 09 Aug 2009 06:40:24 EDT Subject: Re: ads7846: clean up, fix pressure reporting From: Stanislav Brabec To: Pavel Machek Cc: dtor@mail.ru, linux-input@vger.kernel.org, rpurdie@rpsys.net, lenz@cs.wisc.edu, kernel list , Dirk@Opfer-Online.de, arminlitzel@web.de, Cyril Hrubis , thommycheck@gmail.com, linux-arm-kernel , dbaryshkov@gmail.com, omegamoon@gmail.com, eric.miao@marvell.com, Cyril Hrubis In-Reply-To: <20090807180941.GF1728@ucw.cz> References: <20090807180941.GF1728@ucw.cz> Content-Type: text/plain; charset=UTF-8 Date: Sun, 09 Aug 2009 12:21:33 +0200 Message-Id: <1249813293.4334.24.camel@utx.utx.cz> Mime-Version: 1.0 X-Mailer: Evolution 2.22.1.1 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Pavel Machek wrote: > Fix pressure reporting, and clean up debug prints. Thanks. I see much bigger problem with both the old driver and the new ads7846 driver (2.6.30): They are very noisy on my spitz. When you tap to one place, keep stylus pressed and just read values, you get 20-200 pixels long pointer motion trip each second. According to Cyril Hrubiš, it is caused by the electrical noise that originates in the LCD display. The driver needs to read data synchronously with the LCD refresh. He already made the fix for collie several years ago.  The pointer test application in the PROM diagnostic utility does not seem to exhibit any noise. ________________________________________________________________________ Stanislav Brabec http://www.penguin.cz/~utx/zaurus