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From: Richard Cochran <richardcochran-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
To: Vignesh R <vigneshr-l0cyMroinI0@public.gmane.org>
Cc: Rob Herring <robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
	Pawel Moll <pawel.moll-5wv7dgnIgG8@public.gmane.org>,
	Mark Rutland <mark.rutland-5wv7dgnIgG8@public.gmane.org>,
	Ian Campbell
	<ijc+devicetree-KcIKpvwj1kUDXYZnReoRVg@public.gmane.org>,
	Kumar Gala <galak-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>,
	Benoit Cousson <bcousson-rdvid1DuHRBWk0Htik3J/w@public.gmane.org>,
	Tony Lindgren <tony-4v6yS6AI5VpBDgjK7y7TUQ@public.gmane.org>,
	Russell King <linux-lFZ/pmaqli7XmaaqVzeoHQ@public.gmane.org>,
	Jonathan Cameron <jic23-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
	Dmitry Torokhov
	<dmitry.torokhov-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
	devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	Lars-Peter Clausen <lars-Qo5EllUWu/uELgA04lAiVw@public.gmane.org>,
	Samuel Ortiz <sameo-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>,
	Jan Kardell <jan.kardell-KSZdJiTw9mzQT0dZR+AlfA@public.gmane.org>,
	linux-iio-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	Sebastian Andrzej Siewior
	<bigeasy-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org>,
	linux-input-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	Felipe Balbi <balbi-l0cyMroinI0@public.gmane.org>,
	Paul Gortmaker
	<paul.gortmaker-CWA4WttNNZF54TAoqtyWWQ@public.gmane.org>,
	Peter Meerwald <pmeerw-jW+XmwGofnusTnJN9+BGXg@public.gmane.org>,
	Hartmut Knaack <knaack.h-Mmb7MZpHnFY@public.gmane.org>,
	linux-omap-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	Lee Jones <lee.jones-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>,
	linux-arm
Subject: Re: [PATCH 1/4] input: touchscreen: ti_am335x_tsc Interchange touchscreen and ADC steps
Date: Fri, 7 Nov 2014 11:17:14 +0100	[thread overview]
Message-ID: <20141107101714.GA23102@netboy> (raw)
In-Reply-To: <545C59CD.3070707-l0cyMroinI0@public.gmane.org>

On Fri, Nov 07, 2014 at 11:04:05AM +0530, Vignesh R wrote:
> Currently, there is too much noise in the TSC hardware that is being
> removed by delta filtering. I tested TSC unit by removing filtering
> logic, the performance was not at all satisfactory. The cursor jumps
> wayward and smooth circles cannot be drawn. Looks like delta filtering
> cannot be removed as of now. May be I will try and address it in future.

FWIW, on the boards that I tested, I printed the measured values out,
and I found that with 5 repetitions, I got the same value 5 times,
plus or minus a very small delta.

Thanks,
Richard

  parent reply	other threads:[~2014-11-07 10:17 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-10-27 11:08 [PATCH 0/4] Touchscreen performance related fixes Vignesh R
2014-10-27 11:08 ` [PATCH 1/4] input: touchscreen: ti_am335x_tsc Interchange touchscreen and ADC steps Vignesh R
2014-10-31 21:03   ` Hartmut Knaack
2014-11-07  5:48     ` Vignesh R
2014-11-06 14:19   ` Richard Cochran
2014-11-07  5:34     ` Vignesh R
2014-11-07  8:00       ` Richard Cochran
2014-11-10 10:46         ` Vignesh R
     [not found]       ` <545C59CD.3070707-l0cyMroinI0@public.gmane.org>
2014-11-07 10:17         ` Richard Cochran [this message]
2014-10-27 11:08 ` [PATCH 2/4] input: touchscreen: ti_am335x_tsc: Remove udelay in interrupt handler Vignesh R
     [not found]   ` <1414408111-2631-3-git-send-email-vigneshr-l0cyMroinI0@public.gmane.org>
2014-11-03 15:05     ` Lee Jones
2014-11-07  5:48       ` Vignesh R
2014-10-27 11:08 ` [PATCH 3/4] arm: boot: dts: am335x-evm: Make charge delay a DT parameter for tsc Vignesh R
2014-10-31 21:09   ` Hartmut Knaack
2014-11-07  5:48     ` Vignesh R
2014-10-27 11:08 ` [PATCH 4/4] input: touchscreen: ti_am335x_tsc: Use charge delay DT parameter Vignesh R
2014-10-27 17:34 ` [PATCH 0/4] Touchscreen performance related fixes Sebastian Andrzej Siewior
2014-10-27 19:02   ` Griffis, Brad
2014-11-03 12:17     ` Sebastian Andrzej Siewior
     [not found]       ` <54577258.9080508-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org>
2014-11-04 11:44         ` Vignesh R
     [not found]           ` <5458BC0B.1040803-l0cyMroinI0@public.gmane.org>
2014-11-04 12:37             ` Sebastian Andrzej Siewior
     [not found]               ` <5458C87F.80409-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org>
2014-11-05 12:08                 ` Vignesh R
2014-11-17 12:18               ` Vignesh R
2014-11-03 18:09 ` Richard Cochran
     [not found]   ` <20141103180920.GA20779-bi+AKbBUZKY6gyzm1THtWbp2dZbC/Bob@public.gmane.org>
2014-11-06  7:42     ` Vignesh R
2014-11-12 13:00       ` Johannes Pointner
2014-11-13 12:23         ` Vignesh R
     [not found]           ` <5464A2B5.3020207-l0cyMroinI0@public.gmane.org>
2014-11-17 11:39             ` Vignesh R

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