Message-ID: <5472F30A.1000608@linutronix.de>
Date: Mon, 24 Nov 2014 09:57:46 +0100
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
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To: Richard Cochran <richardcochran@gmail.com>, Sekhar Nori <nsekhar@ti.com>
CC: Dmitry Torokhov <dmitry.torokhov@gmail.com>,
        Lee Jones <lee.jones@linaro.org>, Vignesh R <vigneshr@ti.com>,
        Rob Herring <robh+dt@kernel.org>, Pawel Moll <pawel.moll@arm.com>,
        Mark Rutland <mark.rutland@arm.com>,
        Ian Campbell <ijc+devicetree@hellion.org.uk>,
        Kumar Gala <galak@codeaurora.org>,
        Benoit Cousson <bcousson@baylibre.com>,
        Tony Lindgren <tony@atomide.com>,
        Russell King <linux@arm.linux.org.uk>,
        Jonathan Cameron <jic23@kernel.org>, Hartmut Knaack <knaack.h@gmx.de>,
        Lars-Peter Clausen <lars@metafoo.de>,
        Peter Meerwald <pmeerw@pmeerw.net>,
        Samuel Ortiz <sameo@linux.intel.com>, Felipe Balbi <balbi@ti.com>,
        Brad Griffis <bgriffis@ti.com>,
        Sanjeev Sharma <sanjeev_sharma@mentor.com>,
        Paul Gortmaker <paul.gortmaker@windriver.com>,
        Jan Kardell <jan.kardell@telliq.com>, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-omap@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org, linux-iio@vger.kernel.org,
        linux-input@vger.kernel.org, Robert Nelson <robertcnelson@gmail.com>
Subject: Re: [PATCH v4 3/6] mfd: ti_am335x_tscadc: Remove unwanted reg_se_cache
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References: <1415941651-28962-1-git-send-email-vigneshr@ti.com> <1415941651-28962-4-git-send-email-vigneshr@ti.com> <20141118143005.GF24004@x1> <20141118171240.GB3003@dtor-ws> <546DF2F0.9080405@ti.com> <20141120144028.GB5809@localhost.localdomain> <546F2BA4.4000808@ti.com> <20141121131036.GA18931@localhost.localdomain>
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On 11/21/2014 02:10 PM, Richard Cochran wrote:

> On the BB white using the LCD4 cape and the shipped debian kernel, the
> cursor *does* jump away, but not as often or as far as on the custom
> design I was working with.

This sounds like the ADC is still sampling while the input data becomes
invalid. Usually there is a resistor on the wiper line and the
touchscreen manual says how much it should be at least. Could you
please check if this is properly installed?

> 
> Thanks,
> Richard

Sebastian

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