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

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Date:	Fri, 21 Nov 2014 16:11:02 +0100
From:	Johannes Pointner <johannes.pointner@...il.com>
To:	Vignesh R <vigneshr@...com>
Cc:	Sekhar Nori <nsekhar@...com>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Lee Jones <lee.jones@...aro.org>,
	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>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.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 <linux-iio@...r.kernel.org>,
	linux-input@...r.kernel.org,
	Robert Nelson <robertcnelson@...il.com>,
	Richard Cochran <richardcochran@...il.com>
Subject: Re: [PATCH v4 3/6] mfd: ti_am335x_tscadc: Remove unwanted
 reg_se_cache save

I tested version 4 of the patch series on a custom design and I saw
also the jumps as described by Richard. I played a little with the
sample delay and it got better but I couldn't completely remove the
jumps.
The other issue I had with version 3, the pen_ups during the busy
loop, is solved. I experienced some pen_up misses during the busy loop
if I used a too high sample delay, without the sample delay it was ok.

Thanks,
Hannes

2014-11-21 14:10 GMT+01:00 Richard Cochran <richardcochran@...il.com>:
> On Fri, Nov 21, 2014 at 05:40:12PM +0530, Sekhar Nori wrote:
>> Not sure how to reproduce the jumping on pen-up.
>
> Does the cursor stay in exactly the same spot when you lift up the
> stylus? Then you don't have the issue.
>
> 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.
>
> Thanks,
> Richard
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