linux-kernel - Re: [PATCH 19/20] Input: atmel_mxt_ts - remove mxt_make

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Date:	Fri, 30 Mar 2012 00:00:40 -0700
From:	Nick Dyer <nick.dyer@...ev.co.uk>
To:	Daniel Kurtz <djkurtz@...omium.org>
CC:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Joonyoung Shim <jy0922.shim@...sung.com>,
	Iiro Valkonen <iiro.valkonen@...el.com>,
	Henrik Rydberg <rydberg@...omail.se>,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	Benson Leung <bleung@...omium.org>,
	Yufeng Shen <miletus@...omium.org>,
	"Tiwari, Atul" <Atul.Tiwari@...el.com>,
	"Bowens, Alan" <Alan.Bowens@...el.com>
Subject: Re: [PATCH 19/20] Input: atmel_mxt_ts - remove mxt_make_highchg and
 parse T6 report

Daniel Kurtz wrote:
> On Tue, Mar 20, 2012 at 11:38 PM, Nick Dyer <nick.dyer@...ev.co.uk> wrote:
>> mxt_make_highchg exists due to the interrupts being edge triggered. It
>> forces the CHG line to go high.
>>
>> With this implementation, I suspect that if a new message arrives after you
>> have read T44 and before you finish processing messages, then the interrupt
>> handler will not ever be run. What testing have you done on this?
> 
> Actually, for the MXT224E on which I've been testing, the CHG line
> goes high after reading the first byte of the T5 message (in other
> words, the first byte of the first message, no matter how many
> messages T44 reports).

The CHG line behaviour is configurable - you should find this documented in
the data sheet.

> Expect an updated version of this patchset soon.
> 
> Thanks for all of your reviews!

no problem.

-- 
Nick Dyer
Software Engineer, ITDev Ltd
Hardware and Software Development Consultancy
Website: http://www.itdev.co.uk
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