linux-kernel - Re: [PATCH v11 00/56] atmel_mxt

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Message-ID: <80fc7a3e-efd5-fab8-8ba8-8aa011944ab1@mentor.com>
Date:   Wed, 8 Jul 2020 22:05:56 +0900
From:   "Wang, Jiada" <jiada_wang@...tor.com>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>
CC:     <nick@...anahar.org>, <jikos@...nel.org>,
        <benjamin.tissoires@...hat.com>, <bsz@...ihalf.com>,
        <linux-input@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <erosca@...adit-jv.com>, <Andrew_Gabbasov@...tor.com>
Subject: Re: [PATCH v11 00/56] atmel_mxt_ts misc

Hello Dmitry

I am working on refining this series,
regarding your comment about drop changes related to
upload firmware and config during boot.

I found currently only config is uploaded during every boot.
but firmware is only uploaded when userspace asks to do so via
sysfs interface.

Could you help to confirm if this is the case?

Thanks,
Jiada

On 2020/06/25 22:50, Wang, Jiada wrote:
> Hello Dmitry
> 
> sorry for the delay,
> 
> On 2020/05/27 15:43, Dmitry Torokhov wrote:
>> Hi Jiada,
>>
>> On Thu, May 07, 2020 at 10:56:00PM -0700, Jiada Wang wrote:
>>> This patch-set forward ports Nick Dyer's work in ndyer/linux github
>>> repository as long as some other features and fixes
>>
>> Sorry for ignoring the series for quite a while. I guess my biggest
>> issue with the series is that quite a bit of patches are trying to
>> handle the fallout from a very unfortunate design decision in the
>> driver: the fact that it attempts to automatically upload firmware and
>> config on every boot/probe. This design was done at my urging because I
>> did not have access to the technical documentation and did not realize
>> that the controller has non-volatile memory for both firmware and
>> configuration. We should only attempt to automatically load firmware
>> where device does not have non-volatile memory and is unable function
>> otherwise, in all other cases we better leave it to userspace to decide
>> whether to execute firmware update and when. The kernel should only
>> provide facilities so that userspace can initiate firmware update. This
>> design has worked well for Chrome OS for many years (it used Atmel
>> controllers in several products), and I would like to bring it to the
>> mainline.
> 
> I agree with you, I will review the patch-set,
> and only pick these not related to firmware/cfg upload
> 
> Thanks,
> jiada
>>
>> Thanks.
>>