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

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Message-Id: <20191101204801.16328-1-TheSven73@gmail.com>
Date:   Fri,  1 Nov 2019 16:48:01 -0400
From:   Sven Van Asbroeck <thesven73@...il.com>
To:     Marek Vasut <marex@...x.de>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:     Adam Ford <aford173@...il.com>, linux-input@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] Input: ili210x - add ILI2117 support

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.

Suggested replacement:

	touch = ili210x_report_events(priv, touchdata);
	if (chip->continue_polling)
		touch = chip->continue_polling(touchdata);

Sven