linux-kernel - Re: [PATCH v4 0/6] Touchscreen performance related fixes

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Date:	Mon, 15 Dec 2014 14:45:03 +0200
From:	Catalin Crenguta <catalin.crenguta@...il.com>
To:	"Griffis, Brad" <bgriffis@...com>
Cc:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	Nicolae Rosia <nicolae.rosia@...il.com>,
	"R, Vignesh" <vigneshr@...com>, Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Benoit Cousson <bcousson@...libre.com>,
	Tony Lindgren <tony@...mide.com>,
	Russell King <linux@....linux.org.uk>,
	Jonathan Cameron <jic23@...nel.org>,
	Hartmut Knaack <knaack.h@....de>,
	"richardcochran@...il.com" <richardcochran@...il.com>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Lee Jones <lee.jones@...aro.org>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Peter Meerwald <pmeerw@...erw.net>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	"Balbi, Felipe" <balbi@...com>,
	Sanjeev Sharma <sanjeev_sharma@...tor.com>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Jan Kardell <jan.kardell@...liq.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
	"linux-input@...r.kernel.org" <linux-input@...r.kernel.org>
Subject: Re: [PATCH v4 0/6] Touchscreen performance related fixes

On Fri, Dec 12, 2014 at 4:16 PM, Griffis, Brad <bgriffis@...com> wrote:
> How are you configuring ti,charge-delay in your dts?  I've seen this behavior on some custom boards where we were using a smaller charge delay (0x400) to begin with, and by upping it to 0xb000 we resolved the issue.  These patches however already specified ti,charge-delay = 0xb000 by default so this would surprise me that it's still seeing that issue.  Was the touchscreen working as expected before these new patches, or does it have issues both ways?

I have created a DTS for Beaglebone Black with 4 wire touchscreen and
display which works on 3.18 stable and tsc-devel, omap2plus_defconfig
with tsc and tilcdc support.
It seems that with lcdc disabled, I am not getting false reports but
when I'm activating the lcdc, I get a lot of false pen-downs/pen-ups.
Even with tilcdc enabled, after it prints "timeout waiting for
framedone" and the screen get blanked (white), the noise is gone.

Regards,
Catalin.
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