linux-kernel - RE: [PATCH] Input: elan_i2c - +200 ms delay before setting to ABS mode

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Message-ID: <009501d1cc7d$bbcd0950$33671bf0$@emc.com.tw>
Date:	Wed, 22 Jun 2016 20:00:56 +0800
From:	廖崇榮 <kt.liao@....com.tw>
To:	"'Daniel Drake'" <drake@...lessm.com>
Cc:	"'Dmitry Torokhov'" <dmitry.torokhov@...il.com>,
	"'Chris Chiu'" <chiu@...lessm.com>,
	"'Charlie Mooney'" <charliemooney@...omium.org>,
	"'Michele Curti'" <michele.curti@...il.com>,
	"'Krzysztof Kozlowski'" <k.kozlowski@...sung.com>,
	"'Benson Leung'" <bleung@...omium.org>,
	<linux-input@...r.kernel.org>,
	"'Linux Kernel'" <linux-kernel@...r.kernel.org>,
	"'Linux Upstreaming Team'" <linux@...lessm.com>,
	'黃世鵬 經理' <phoenix@....com.tw>
Subject: RE: [PATCH] Input: elan_i2c - +200 ms delay before setting to ABS mode

-----Original Message-----
From: Daniel Drake [mailto:drake@...lessm.com] 
Sent: Tuesday, June 21, 2016 10:42 PM
To: 廖崇榮
Cc: Dmitry Torokhov; Chris Chiu; Charlie Mooney; Michele Curti; Krzysztof Kozlowski; Benson Leung; linux-input@...r.kernel.org; Linux Kernel; Linux Upstreaming Team; 黃世鵬 經理
Subject: Re: [PATCH] Input: elan_i2c - +200 ms delay before setting to ABS mode

On Tue, Jun 21, 2016 at 6:40 AM, 廖崇榮 <kt.liao@....com.tw> wrote:
> KT, is this feasible?
> [KT] After internal discussion, we don't agree this patch.
>     It's a work-around to fix firmware bug for specific touchpad and 
> not tested by other device.

For better or worse, Linux often takes on the responsibility of working around firmware bugs. This is a real issue that affects multiple Asus laptops; you'll have no touchpad input upon reboot from any OS that drives the touchpad in "generic hid" mode (e.g. older version of Linux, some embedded OS, etc).

If the sleep is really that controversial, we could make it specific to the ELAN1000 model that is the one in question here?

[KT]:We can consider to control specific module, our FW engineer is checking it and confirm which part number for ASUS should adopt work-around.
we will reply you once we confirm.

Thanks
Daniel