linux-kernel - Re: [PATCH AUTOSEL 5.15 10/25] HID: multitouch: Add quirks for flipped axes

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Message-ID: <Y/zFYpxtkBmNmFLf@sashalap>
Date:   Mon, 27 Feb 2023 09:59:46 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     Jean Delvare <jdelvare@...e.de>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Allen Ballway <ballway@...omium.org>,
        Jiri Kosina <jkosina@...e.cz>, jikos@...nel.org,
        benjamin.tissoires@...hat.com, groeck@...omium.org,
        alistair@...stair23.me, dmitry.torokhov@...il.com,
        jk@...econstruct.com.au, Jonathan.Cameron@...wei.com,
        cmo@...exis.com, u.kleine-koenig@...gutronix.de,
        linux-input@...r.kernel.org
Subject: Re: [PATCH AUTOSEL 5.15 10/25] HID: multitouch: Add quirks for
 flipped axes

On Mon, Feb 27, 2023 at 01:23:00PM +0100, Jean Delvare wrote:
>Hi Sasha,
>
>On Sun, 26 Feb 2023 21:08:33 -0500, Sasha Levin wrote:
>> From: Allen Ballway <ballway@...omium.org>
>>
>> [ Upstream commit a2f416bf062a38bb76cccd526d2d286b8e4db4d9 ]
>>
>> Certain touchscreen devices, such as the ELAN9034, are oriented
>> incorrectly and report touches on opposite points on the X and Y axes.
>> For example, a 100x200 screen touched at (10,20) would report (90, 180)
>> and vice versa.
>>
>> This is fixed by adding device quirks to transform the touch points
>> into the correct spaces, from X -> MAX(X) - X, and Y -> MAX(Y) - Y.
>>
>> Signed-off-by: Allen Ballway <ballway@...omium.org>
>> Signed-off-by: Jiri Kosina <jkosina@...e.cz>
>> Signed-off-by: Sasha Levin <sashal@...nel.org>
>> ---
>>  drivers/hid/hid-multitouch.c             | 39 ++++++++++++++++++---
>>  drivers/hid/hid-quirks.c                 |  6 ++++
>>  drivers/hid/i2c-hid/i2c-hid-dmi-quirks.c | 43 ++++++++++++++++++++++++
>>  drivers/hid/i2c-hid/i2c-hid.h            |  3 ++
>>  4 files changed, 87 insertions(+), 4 deletions(-)
>> (...)
>
>Second rule of acceptance for stable patches:
>
> - It cannot be bigger than 100 lines, with context.
>
>Clearly not met here.

About a quarter of stable commits in the last 12 months breat the rule
above.

>To me, this commit is something distributions may want to backport if
>their users run are likely to run the affected hardware. But it's out
>of scope for stable kernel branches.

Why? We explicitly call out new device IDs and quirks in the same doc
you quoted the 100 line rule from.

-- 
Thanks,
Sasha