linux-kernel - Re: [PATCH 1/4] input: touchscreen: ti_am335x_tsc Interchange touchscreen and ADC steps

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20141107101714.GA23102@netboy>
Date:	Fri, 7 Nov 2014 11:17:14 +0100
From:	Richard Cochran <richardcochran@...il.com>
To:	Vignesh R <vigneshr@...com>
Cc:	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>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	devicetree@...r.kernel.org, Lars-Peter Clausen <lars@...afoo.de>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Jan Kardell <jan.kardell@...liq.com>,
	linux-iio@...r.kernel.org,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	Felipe Balbi <balbi@...com>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Peter Meerwald <pmeerw@...erw.net>,
	Hartmut Knaack <knaack.h@....de>, linux-omap@...r.kernel.org,
	Lee Jones <lee.jones@...aro.org>,
	linux-arm-kernel@...ts.infradead.org,
	Brad Griffis <bgriffis@...com>
Subject: Re: [PATCH 1/4] input: touchscreen: ti_am335x_tsc Interchange
 touchscreen and ADC steps

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
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/