From mboxrd@z Thu Jan  1 00:00:00 1970
From: Richard Cochran <richardcochran@gmail.com>
Subject: Re: [PATCH v4 3/6] mfd: ti_am335x_tscadc: Remove unwanted
 reg_se_cache save
Date: Mon, 24 Nov 2014 11:01:49 +0100
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To: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Sekhar Nori <nsekhar@ti.com>, 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-om
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On Mon, Nov 24, 2014 at 09:57:46AM +0100, Sebastian Andrzej Siewior wrote:
> 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?

Wiper line? This is a four wire device.

Thanks,
Richard