linux-kernel - Re: [PATCH 00/15] atmel_mxt_ts - device tree, bootloader, etc

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Message-ID: <20140728172853.GB8982@core.coreip.homeip.net>
Date:	Mon, 28 Jul 2014 10:28:53 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Stephen Warren <swarren@...dotorg.org>
Cc:	Nick Dyer <nick.dyer@...ev.co.uk>,
	benson Leung <bleung@...omium.org>,
	Yufeng Shen <miletus@...omium.org>,
	Daniel Kurtz <djkurtz@...omium.org>,
	Yufeng Shen <miletus@...gle.com>,
	Henrik Rydberg <rydberg@...omail.se>,
	Joonyoung Shim <jy0922.shim@...sung.com>,
	Alan Bowens <Alan.Bowens@...el.com>,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	Peter Meerwald <pmeerw@...erw.net>,
	Olof Johansson <olofj@...omium.org>,
	Sekhar Nori <nsekhar@...com>
Subject: Re: [PATCH 00/15] atmel_mxt_ts - device tree, bootloader, etc

On Fri, Jul 25, 2014 at 02:06:40PM -0600, Stephen Warren wrote:
> On 07/25/2014 08:10 AM, Nick Dyer wrote:
> >On 24/07/14 22:19, Stephen Warren wrote:
> ...
> >>I've uploaded 2 logs to:
> >>
> >>http://avon.wwwdotorg.org/downloads/mxt-logs/
> >>(note there's no directory indexing, so manually add the filenames below to
> >>the URL)
> >>
> >>mxt-save-no-movement.xml
> >>
> >>This is with the whole series applied. Neither mouse movement nor clicks
> >>works. I tried mxt-app --reset and it made no difference to the dump results.
> >>
> >>mxt-save-move-ok-no-clicking.xml
> >>
> >>This is with "Input: atmel_mxt_ts - use deep sleep mode when stopped"
> >>reverted; mouse movement works, but clicking doesn't.
> >
> >Great, this has identified the issue with mouse movement (touch).
> >
> >The config programmed into the NVRAM on your touch controller has the first
> >byte of the T9 touchscreen object set to zero. This is the CTRL byte which
> >enables/disables the touch object and what it reports. It is relying on
> >this to enable the touchscreen on resume:
> >
> >https://github.com/dtor/input/blob/9d8dc3e529/drivers/input/touchscreen/atmel_mxt_ts.c#L2005-L2006
> >
> >My "use deep sleep mode when stopped" patch stops the driver writing to the
> >T9.CTRL byte, so whatever config you have in NVRAM for that byte will be
> >used (ie zero, disabled). Going forward, deep sleep is more generic.
> >Indeed, newer chips do not have T9 at all, or they might be using other
> >touch objects. The deep sleep mode is a lower power state to be in, and is
> >what Atmel recommends.
> >
> >However, it does mean changing the maxtouch cfg - you can write the 0x83 to
> >the first byte of T9 and save it to NVRAM, by doing:
> >
> >mxt-app [device] -W -T9 83
> >mxt-app [device] --backup
> 
> If I do that, then both mouse movement and "touch" clicks work:-)
> 
> (Dmitry, I guess that means it's fine to go ahead and apply "Input:
> atmel_mxt_ts - use deep sleep mode when stopped".)

OK, I've applied it (but because it now last I had to resolve a few
conflicts so if somebody could take a peek at my next branch that would
be great).

Thanks.

-- 
Dmitry
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