Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751779AbaKGKRh (ORCPT ); Fri, 7 Nov 2014 05:17:37 -0500 Received: from mail-wi0-f170.google.com ([209.85.212.170]:36806 "EHLO mail-wi0-f170.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751141AbaKGKRc (ORCPT ); Fri, 7 Nov 2014 05:17:32 -0500 Date: Fri, 7 Nov 2014 11:17:14 +0100 From: Richard Cochran To: Vignesh R Cc: Rob Herring , Pawel Moll , Mark Rutland , Ian Campbell , Kumar Gala , Benoit Cousson , Tony Lindgren , Russell King , Jonathan Cameron , Dmitry Torokhov , devicetree@vger.kernel.org, Lars-Peter Clausen , Samuel Ortiz , Jan Kardell , linux-iio@vger.kernel.org, Sebastian Andrzej Siewior , linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, Felipe Balbi , Paul Gortmaker , Peter Meerwald , Hartmut Knaack , linux-omap@vger.kernel.org, Lee Jones , linux-arm-kernel@lists.infradead.org, Brad Griffis Subject: Re: [PATCH 1/4] input: touchscreen: ti_am335x_tsc Interchange touchscreen and ADC steps Message-ID: <20141107101714.GA23102@netboy> References: <1414408111-2631-1-git-send-email-vigneshr@ti.com> <1414408111-2631-2-git-send-email-vigneshr@ti.com> <20141106141916.GA17151@netboy> <545C59CD.3070707@ti.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <545C59CD.3070707@ti.com> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Nov 07, 2014 at 11:04:05AM +0530, Vignesh R wrote: > Currently, there is too much noise in the TSC hardware that is being > removed by delta filtering. I tested TSC unit by removing filtering > logic, the performance was not at all satisfactory. The cursor jumps > wayward and smooth circles cannot be drawn. Looks like delta filtering > cannot be removed as of now. May be I will try and address it in future. FWIW, on the boards that I tested, I printed the measured values out, and I found that with 5 repetitions, I got the same value 5 times, plus or minus a very small delta. Thanks, Richard -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/