From: Richard Cochran <richardcochran@gmail.com>
To: Catalin Crenguta <catalin.crenguta@gmail.com>
Cc: "Griffis, Brad" <bgriffis@ti.com>,
Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
Nicolae Rosia <nicolae.rosia@gmail.com>,
"R, Vignesh" <vigneshr@ti.com>, Rob Herring <robh+dt@kernel.org>,
Pawel Moll <pawel.moll@arm.com>,
Mark Rutland <mark.rutland@arm.com>,
Ian Campbell <ijc+devicetree@hellion.org.uk>,
Kumar Gala <galak@codeaurora.org>,
Benoit Cousson <bcousson@baylibre.com>,
Tony Lindgren <tony@atomide.com>,
Russell King <linux@arm.linux.org.uk>,
Jonathan Cameron <jic23@kernel.org>,
Hartmut Knaack <knaack.h@gmx.de>,
Dmitry Torokhov <dmitry.torokhov@gmail.com>,
Lee Jones <lee.jones@linaro.org>,
Lars-Peter Clausen <lars@metafoo.de>,
Peter Meerwald <pmeerw@pmeerw.net>,
Samuel Ortiz <sameo@linux.intel.com>,
"Balbi, Felipe" <balbi@ti.com>,
Sanjeev Sharma <sanjeev_sharma@mentor.com>,
Paul Gortmaker <paul.gortmaker@windriver.com>,
Jan Kardell <jan.kardell@telliq.com>,
"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-omap@vger.kernel.org" <linux-omap@vger.kernel.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
"linux-iio@vger.kernel.org" <linux-iio@vger.kernel.org>,
"linux-input@vger.kernel.org" <linux-input@vger.kernel.org>
Subject: Re: [PATCH v4 0/6] Touchscreen performance related fixes
Date: Tue, 16 Dec 2014 16:30:48 +0100 [thread overview]
Message-ID: <20141216153048.GA16981@localhost.localdomain> (raw)
In-Reply-To: <CABH3fy8S1Hb9LK=ZceWgJsNvLbq8pwu00Tcj_0vE4j6QzcO+kg@mail.gmail.com>
On Tue, Dec 16, 2014 at 10:31:47AM +0200, Catalin Crenguta wrote:
>
> It seems that because the ribbon cable has both the analog and digital
> signals, the analog signals are affected by the digital ones (hence
> the touchscreen was working OK when the display was disabled). Putting
> decoupling capacitors on X+, X-, Y+, Y- reduces the noise and the
> false events disappear.
IOW, the root cause is a design flaw in the BB-View 4.3 Cape?
Thanks,
Richard
WARNING: multiple messages have this Message-ID (diff)
From: Richard Cochran <richardcochran-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
To: Catalin Crenguta
<catalin.crenguta-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Cc: "Griffis, Brad" <bgriffis-l0cyMroinI0@public.gmane.org>,
Sebastian Andrzej Siewior
<bigeasy-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org>,
Nicolae Rosia
<nicolae.rosia-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
"R, Vignesh" <vigneshr-l0cyMroinI0@public.gmane.org>,
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>,
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>,
"Balbi, Felipe" <balbi-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@telliq.c>
Subject: Re: [PATCH v4 0/6] Touchscreen performance related fixes
Date: Tue, 16 Dec 2014 16:30:48 +0100 [thread overview]
Message-ID: <20141216153048.GA16981@localhost.localdomain> (raw)
In-Reply-To: <CABH3fy8S1Hb9LK=ZceWgJsNvLbq8pwu00Tcj_0vE4j6QzcO+kg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
On Tue, Dec 16, 2014 at 10:31:47AM +0200, Catalin Crenguta wrote:
>
> It seems that because the ribbon cable has both the analog and digital
> signals, the analog signals are affected by the digital ones (hence
> the touchscreen was working OK when the display was disabled). Putting
> decoupling capacitors on X+, X-, Y+, Y- reduces the noise and the
> false events disappear.
IOW, the root cause is a design flaw in the BB-View 4.3 Cape?
Thanks,
Richard
WARNING: multiple messages have this Message-ID (diff)
From: richardcochran@gmail.com (Richard Cochran)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v4 0/6] Touchscreen performance related fixes
Date: Tue, 16 Dec 2014 16:30:48 +0100 [thread overview]
Message-ID: <20141216153048.GA16981@localhost.localdomain> (raw)
In-Reply-To: <CABH3fy8S1Hb9LK=ZceWgJsNvLbq8pwu00Tcj_0vE4j6QzcO+kg@mail.gmail.com>
On Tue, Dec 16, 2014 at 10:31:47AM +0200, Catalin Crenguta wrote:
>
> It seems that because the ribbon cable has both the analog and digital
> signals, the analog signals are affected by the digital ones (hence
> the touchscreen was working OK when the display was disabled). Putting
> decoupling capacitors on X+, X-, Y+, Y- reduces the noise and the
> false events disappear.
IOW, the root cause is a design flaw in the BB-View 4.3 Cape?
Thanks,
Richard
next prev parent reply other threads:[~2014-12-16 15:30 UTC|newest]
Thread overview: 141+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-11-14 5:07 [PATCH v4 0/6] Touchscreen performance related fixes Vignesh R
2014-11-14 5:07 ` Vignesh R
2014-11-14 5:07 ` Vignesh R
2014-11-14 5:07 ` [PATCH v4 1/6] input: touchscreen: ti_am335x_tsc Interchange touchscreen and ADC steps Vignesh R
2014-11-14 5:07 ` Vignesh R
2014-11-14 5:07 ` Vignesh R
2014-11-14 5:07 ` [PATCH v4 2/6] input: touchscreen: ti_am335x_tsc: Remove udelay in interrupt handler Vignesh R
2014-11-14 5:07 ` Vignesh R
2014-11-14 5:07 ` Vignesh R
2014-11-15 19:27 ` Richard Cochran
2014-11-15 19:27 ` Richard Cochran
2014-11-15 19:27 ` Richard Cochran
2014-11-17 4:27 ` Vignesh R
2014-11-17 4:27 ` Vignesh R
2014-11-17 4:27 ` Vignesh R
2014-11-17 8:23 ` Richard Cochran
2014-11-17 8:23 ` Richard Cochran
2014-11-17 8:23 ` Richard Cochran
2014-11-17 12:18 ` Vignesh R
2014-11-17 12:18 ` Vignesh R
2014-11-17 12:18 ` Vignesh R
2014-11-14 5:07 ` [PATCH v4 3/6] mfd: ti_am335x_tscadc: Remove unwanted reg_se_cache save Vignesh R
2014-11-14 5:07 ` Vignesh R
2014-11-14 5:07 ` Vignesh R
2014-11-18 14:30 ` Lee Jones
2014-11-18 14:30 ` Lee Jones
2014-11-18 14:30 ` Lee Jones
2014-11-18 17:12 ` Dmitry Torokhov
2014-11-18 17:12 ` Dmitry Torokhov
2014-11-18 17:12 ` Dmitry Torokhov
2014-11-20 13:56 ` Sekhar Nori
2014-11-20 13:56 ` Sekhar Nori
2014-11-20 13:56 ` Sekhar Nori
2014-11-20 14:23 ` Griffis, Brad
2014-11-20 14:23 ` Griffis, Brad
2014-11-20 14:23 ` Griffis, Brad
2014-11-20 14:23 ` Griffis, Brad
2014-11-20 14:34 ` Richard Cochran
2014-11-20 14:34 ` Richard Cochran
2014-11-20 14:34 ` Richard Cochran
2014-11-20 14:34 ` Richard Cochran
2014-11-20 14:40 ` Richard Cochran
2014-11-20 14:40 ` Richard Cochran
2014-11-20 14:40 ` Richard Cochran
2014-11-21 12:10 ` Sekhar Nori
2014-11-21 12:10 ` Sekhar Nori
2014-11-21 12:10 ` Sekhar Nori
2014-11-21 13:10 ` Richard Cochran
2014-11-21 13:10 ` Richard Cochran
2014-11-21 13:10 ` Richard Cochran
2014-11-21 15:11 ` Johannes Pointner
2014-11-21 15:11 ` Johannes Pointner
2014-11-21 15:11 ` Johannes Pointner
2014-11-21 15:37 ` Sekhar Nori
2014-11-21 15:37 ` Sekhar Nori
2014-11-21 15:37 ` Sekhar Nori
2014-11-21 18:17 ` Johannes Pointner
2014-11-21 18:17 ` Johannes Pointner
2014-11-21 18:17 ` Johannes Pointner
2014-11-21 21:40 ` Richard Cochran
2014-11-21 21:40 ` Richard Cochran
2014-11-21 21:40 ` Richard Cochran
2014-11-21 22:25 ` Griffis, Brad
2014-11-21 22:25 ` Griffis, Brad
2014-11-21 22:25 ` Griffis, Brad
2014-11-21 22:25 ` Griffis, Brad
2014-11-24 8:32 ` Johannes Pointner
2014-11-24 8:32 ` Johannes Pointner
2014-11-24 8:32 ` Johannes Pointner
2014-11-24 8:32 ` Johannes Pointner
2014-11-24 8:57 ` Sebastian Andrzej Siewior
2014-11-24 8:57 ` Sebastian Andrzej Siewior
2014-11-24 8:57 ` Sebastian Andrzej Siewior
2014-11-24 10:01 ` Richard Cochran
2014-11-24 10:01 ` Richard Cochran
2014-11-24 10:01 ` Richard Cochran
2014-11-14 5:07 ` [PATCH v4 4/6] ARM: dts: AM335x: Make charge delay a DT parameter for TSC Vignesh R
2014-11-14 5:07 ` Vignesh R
2014-11-14 5:07 ` Vignesh R
2014-11-14 18:03 ` Tony Lindgren
2014-11-14 18:03 ` Tony Lindgren
2014-11-14 18:03 ` Tony Lindgren
2014-11-14 5:07 ` [PATCH v4 5/6] input: touchscreen: ti_am335x_tsc: Use charge delay DT parameter Vignesh R
2014-11-14 5:07 ` Vignesh R
2014-11-14 5:07 ` Vignesh R
2014-11-14 5:07 ` [PATCH v4 6/6] input: touchscreen: ti_am335x_tsc: Replace delta filtering with median filtering Vignesh R
2014-11-14 5:07 ` Vignesh R
2014-11-14 5:07 ` Vignesh R
2014-11-24 11:51 ` [PATCH v4 0/6] Touchscreen performance related fixes Sebastian Andrzej Siewior
2014-11-24 11:51 ` Sebastian Andrzej Siewior
2014-11-24 11:51 ` Sebastian Andrzej Siewior
2014-11-24 12:16 ` Vignesh R
2014-11-24 12:16 ` Vignesh R
2014-11-24 12:16 ` Vignesh R
2014-11-24 12:35 ` Sebastian Andrzej Siewior
2014-11-24 12:35 ` Sebastian Andrzej Siewior
2014-11-24 12:35 ` Sebastian Andrzej Siewior
2014-11-27 4:29 ` Vignesh R
2014-11-27 4:29 ` Vignesh R
2014-11-27 4:29 ` Vignesh R
2014-12-01 9:53 ` Vignesh R
2014-12-01 9:53 ` Vignesh R
2014-12-01 9:53 ` Vignesh R
2014-12-01 9:59 ` Sebastian Andrzej Siewior
2014-12-01 9:59 ` Sebastian Andrzej Siewior
2014-12-01 9:59 ` Sebastian Andrzej Siewior
2014-12-01 10:29 ` Vignesh R
2014-12-01 10:29 ` Vignesh R
2014-12-01 10:29 ` Vignesh R
2014-12-11 20:34 ` Nicolae Rosia
2014-12-11 20:34 ` Nicolae Rosia
2014-12-11 20:34 ` Nicolae Rosia
2014-12-11 20:40 ` Sebastian Andrzej Siewior
2014-12-11 20:40 ` Sebastian Andrzej Siewior
2014-12-11 20:40 ` Sebastian Andrzej Siewior
2014-12-12 13:48 ` Vignesh R
2014-12-12 13:48 ` Vignesh R
2014-12-12 13:48 ` Vignesh R
2014-12-12 13:55 ` Catalin Crenguta
2014-12-12 13:55 ` Catalin Crenguta
2014-12-12 13:55 ` Catalin Crenguta
2014-12-12 14:16 ` Griffis, Brad
2014-12-12 14:16 ` Griffis, Brad
2014-12-12 14:16 ` Griffis, Brad
2014-12-12 14:16 ` Griffis, Brad
2014-12-15 7:55 ` Catalin Crenguta
2014-12-15 7:55 ` Catalin Crenguta
2014-12-15 7:55 ` Catalin Crenguta
2014-12-15 7:55 ` Catalin Crenguta
2014-12-15 12:45 ` Catalin Crenguta
2014-12-15 12:45 ` Catalin Crenguta
2014-12-15 12:45 ` Catalin Crenguta
2014-12-15 12:45 ` Catalin Crenguta
2014-12-16 8:31 ` Catalin Crenguta
2014-12-16 8:31 ` Catalin Crenguta
2014-12-16 8:31 ` Catalin Crenguta
2014-12-16 8:31 ` Catalin Crenguta
2014-12-16 15:30 ` Richard Cochran [this message]
2014-12-16 15:30 ` Richard Cochran
2014-12-16 15:30 ` Richard Cochran
2014-12-16 15:30 ` Richard Cochran
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