linux-kernel - Re: [PATCH 22/51] Input: atmel_mxt_ts

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Message-ID: <51DDA8D7.8010405@itdev.co.uk>
Date:	Wed, 10 Jul 2013 19:32:55 +0100
From:	Nick Dyer <nick.dyer@...ev.co.uk>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
CC:	Daniel Kurtz <djkurtz@...omium.org>,
	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>,
	Benson Leung <bleung@...omium.org>,
	Olof Johansson <olofj@...omium.org>
Subject: Re: [PATCH 22/51] Input: atmel_mxt_ts - Add shutdown function

Dmitry Torokhov wrote:
>> The patch disables the interrupt handler on shutdown.
>>
>> One of our customers reported a bug caused by input events being generated
>> during shutdown (for example if the user was touching the device whilst it
>> was turning off), which was solved by putting in this change.
> 
> What kind of bug? Could you please be more precise?

I did some more digging. Unfortunately the original problem report (some
time around March 2012) was in a customer ticket system that I no longer
have access to. It could well be trying to paper over a problem in their
app layer, to be honest.

>> However, now you've drawn my attention to it again, it seems to me that
>> probably a better thing for us to be doing would be to power off the
>> touchscreen controller here, and let the interrupt disable be handled by
>> core code - do you agree?
> 
> We'd be powering off everything in a moment anyway, no? Or is there a
> concern that the device will stay powered up even if the system is in off
> state?

I agree. I think it's best to not apply this patch for the moment, until we
can prove it's actually required.

Let me know if you want me to generate a new pull request.
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