From mboxrd@z Thu Jan  1 00:00:00 1970
From: Vignesh R <vigneshr-l0cyMroinI0@public.gmane.org>
Subject: Re: [PATCH v4 0/6] Touchscreen performance related fixes
Date: Thu, 27 Nov 2014 09:59:33 +0530
Message-ID: <5476A8AD.4010003@ti.com>
References: <1415941651-28962-1-git-send-email-vigneshr@ti.com> <20141124115116.GA14997@linutronix.de> <547321A2.6010207@ti.com> <547325FA.6020004@linutronix.de>
Mime-Version: 1.0
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: 7bit
Return-path: <linux-iio-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
In-Reply-To: <547325FA.6020004-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org>
Sender: linux-iio-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
To: Sebastian Andrzej Siewior <bigeasy-hfZtesqFncYOwBW4kG4KsQ@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>, Hartmut Knaack <knaack.h-Mmb7MZpHnFY@public.gmane.org>, richardcochran-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org, Dmitry Torokhov <dmitry.torokhov-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>, Lee Jones <lee.jones-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>, Lars-Peter Clausen <lars-Qo5EllUWu/uELgA04lAiVw@public.gmane.org>, Peter Meerwald <pmeerw-jW+XmwGofnusTnJN9+BGXg@public.gmane.org>, Samuel Ortiz <sameo-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>, Felipe Balbi <balbi-l0cyMroinI0@public.gmane.org>, Brad Griffis <bgriffis-l0cyMroinI0@public.gmane.org>, Sanjeev Sharma <sanjeev_sharma-nmGgyN9QBj3QT0dZR+AlfA@public.gmane.org>, Paul Gortmaker <paul.gortmaker-CWA4WttNNZF54TAoqtyWWQ@public.gmane.org>, Jan Kardell <jan.kardell-KSZdJiTw9mzQT0dZR+AlfA@public.gmane.org>, devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-omap-u79uwXL29TY76Z2rM5mHXA@public.gmane.orglinux
List-Id: devicetree@vger.kernel.org



On Monday 24 November 2014 06:05 PM, Sebastian Andrzej Siewior wrote:
> On 11/24/2014 01:16 PM, Vignesh R wrote:
> 
>> I have tried running both IIO and TSC at the same time. But I have never
>> seen WARN_ON() even after running for close to 30 min. Can you send me
>> the exact script, so that it will be easy to reproduce?
> 
> Sure thing.
> - one shell
> 	evtest /dev/input/event2
> - second shell
> 	./iio-test.sh
>   with:
> 
> |#!/bin/sh
> |
> |while [ 1 = 1 ]
> |do
> |        cat /sys/bus/iio/devices/iio\:device0/in_voltage4_raw
> |done
> 
> 
> the kernel config: https://breakpoint.cc/am335x-config
> 

I was able to reproduce this issue. When ADC hits WARN_ON(), the TSC
steps should be disabled. But, in this case, TSC is sampling the first Y
co-ordinate and all TSC steps are enabled.
REG_SE: 0x1ffc1
ADC_STAT: 0x24

Any idea why this may be happening?

Regards
Vignesh