linux-kernel - Re: [PATCH 2/2] Input: ili210x

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Date:   Mon, 4 Nov 2019 01:16:21 +0100
From:   Marek Vasut <marex@...x.de>
To:     Adam Ford <aford173@...il.com>,
        Sven Van Asbroeck <thesven73@...il.com>
Cc:     Dmitry Torokhov <dmitry.torokhov@...il.com>,
        linux-input@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] Input: ili210x - add ILI2117 support

On 11/4/19 12:55 AM, Adam Ford wrote:
> On Fri, Nov 1, 2019 at 3:48 PM Sven Van Asbroeck wrote:
>>
>> Dmitry / Marek,
>>
>> There have been two attempts to add ILI2117 touch controller support.
>> I was about to add a third, but luckily I checked the mailing list
>> before writing any code :)
>>
>> Adding this support would clearly be beneficial for the common good.
>> What can we do to get this in motion again?
>>
>> Last time I checked, Marek posted a patch which added the 2117, but Dmitry
>> objected, because the code became too unwieldy. Dmitry then posted a cleanup
>> patch, which did not work for Marek. So everything came to a halt.
>> See:
>> https://patchwork.kernel.org/patch/10836651/
>> https://www.spinics.net/lists/linux-input/msg62670.html
>>
>> Dmitry, would you perhaps be willing to accept Marek's patch, and perform the
>> cleanup later?
>>
>> Marek, would you perhaps be willing to invest some time to debug Dmitry's
>> cleanup patch?
>>
>> On my end, I've reviewed Dmitry's patch and it looks mostly ok. I saw one
>> difference with ILI210X which could explain Marek's results, but I can't be
>> sure - because I could not locate the 210X's register layout on the web.
>>
>> In Dmitry's patch, we see:
>>
>>         touch = ili210x_report_events(priv, touchdata);
>>         if (touch || chip->continue_polling(touchdata))
>>                 schedule_delayed_work(&priv->dwork,
>>                                       msecs_to_jiffies(priv->poll_period));
>>
>> but this is not exactly equivalent to the original. Because in the original,
>> the 210X's decision to kick off delayed work is completely independent of
>> the value of touch.
>>
> 
> If anyone is interested, I posted a patch to add ili2117A.
> https://patchwork.kernel.org/patch/10849877/
> 
> I am not sure if it's compatible with the non-A version.

This patch could've gone in as-is, the rework was not necessary (and
indeed, didn't work). I don't know why this patch wasn't applied in the
end, maybe it was just missed.