linux-kernel - Re: [PATCH v6 2/6] input: touchscreen: ti_am335x

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Message-ID: <20150203194956.GD20256@dtor-ws>
Date:	Tue, 3 Feb 2015 11:49:56 -0800
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Vignesh R <vigneshr@...com>
Cc:	Jonathan Cameron <jic23@...nel.org>,
	Hartmut Knaack <knaack.h@....de>,
	Lee Jones <lee.jones@...aro.org>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	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>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Peter Meerwald <pmeerw@...erw.net>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Brad Griffis <bgriffis@...com>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Sanjeev Sharma <sanjeev_sharma@...tor.com>,
	Jan Kardell <jan.kardell@...liq.com>,
	Felipe Balbi <balbi@...com>, Wolfram Sang <wsa@...-dreams.de>,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-omap@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-iio@...r.kernel.org, linux-input@...r.kernel.org
Subject: Re: [PATCH v6 2/6] input: touchscreen: ti_am335x_tsc: Remove udelay
 in interrupt handler

On Fri, Jan 30, 2015 at 10:56:28AM +0530, Vignesh R wrote:
> 
> 
> On Wednesday 07 January 2015 11:19 AM, Vignesh R wrote:
> > From: Brad Griffis <bgriffis@...com>
> > 
> > TSC interrupt handler had udelay to avoid reporting of false pen-up
> > interrupt to user space. This patch implements workaround suggesting in
> > Advisory 1.0.31 of silicon errata for am335x, thus eliminating udelay
> > and touchscreen lag. This also improves performance of touchscreen and
> > eliminates sudden jump of cursor at touch release.
> > 
> > IDLECONFIG and CHARGECONFIG registers are to be configured
> > with same values in order to eliminate false pen-up events. This
> > workaround may result in false pen-down to be detected, hence considerable
> > charge step delay needs to be added. The charge delay is set to 0xB000
> > (in terms of ADC clock cycles) by default.
> > 
> > TSC steps are disabled at the end of every sampling cycle and EOS bit is
> > set. Once the EOS bit is set, the TSC steps need to be re-enabled to begin
> > next sampling cycle.
> > 
> > Signed-off-by: Brad Griffis <bgriffis@...com>
> > [vigneshr@...com: Ported the patch from v3.12 to v3.19rc1]
> > 
> > Signed-off-by: Vignesh R <vigneshr@...com>
> > ---
> 
> Ping... Can somebody pick this patch series if there are no more comments??

Yes, I picked up everything but patch #3 as I assume Lee will merge it
through MFD tree.

Thanks.

-- 
Dmitry
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