linux-kernel - Re: [PATCH 0/4] Touchscreen performance related fixes

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Message-ID: <5458C87F.80409@linutronix.de>
Date:	Tue, 04 Nov 2014 13:37:19 +0100
From:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:	Vignesh R <vigneshr@...com>, "Griffis, Brad" <bgriffis@...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>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>
CC:	Hartmut Knaack <knaack.h@....de>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Peter Meerwald <pmeerw@...erw.net>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Lee Jones <lee.jones@...aro.org>,
	"Balbi, Felipe" <balbi@...com>,
	Jan Kardell <jan.kardell@...liq.com>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
	"linux-input@...r.kernel.org" <linux-input@...r.kernel.org>
Subject: Re: [PATCH 0/4] Touchscreen performance related fixes

On 11/04/2014 12:44 PM, Vignesh R wrote:

> I ran following commands
> $ evtest /dev/input/touchscreen0 &
> (with heavy item on touchscreen)
>  and
> $ cat /sys/bus/iio/devices/iio\:device0/scan_elements/in_voltage4_en
> (in a busy loop)
> I tried above experiment on my board but I didn't hit any problem even
> after running for close to 30 minutes. I was unable to reproduce failure

Just to make sure: You had the touchscreen and iio command running in
parallel and you saw evtest output while there was iio operation?

> The problem may be in configuring correct charge-delay value. Please run:
> $ ts_test > /dev/null
> and let me know if pen events are being detected properly.

Well I get the touch events but not while busy loop on iio interface is
running (I get maybe one event every 5 seconds or so).
After all, it is the same HW you have.

Sebastian
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