linux-kernel - Re: [PATCH v4 3/6] mfd: ti_am335x_tscadc: Remove unwanted reg_se

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Message-ID: <5472F30A.1000608@linutronix.de>
Date:	Mon, 24 Nov 2014 09:57:46 +0100
From:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:	Richard Cochran <richardcochran@...il.com>,
	Sekhar Nori <nsekhar@...com>
CC:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Lee Jones <lee.jones@...aro.org>, Vignesh R <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>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Peter Meerwald <pmeerw@...erw.net>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Felipe Balbi <balbi@...com>, Brad Griffis <bgriffis@...com>,
	Sanjeev Sharma <sanjeev_sharma@...tor.com>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Jan Kardell <jan.kardell@...liq.com>,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-omap@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-iio@...r.kernel.org, linux-input@...r.kernel.org,
	Robert Nelson <robertcnelson@...il.com>
Subject: Re: [PATCH v4 3/6] mfd: ti_am335x_tscadc: Remove unwanted reg_se_cache
 save

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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