linux-kernel - Re: [RFC PATCH v3 1/5] ACPI: button: Add indication of BIOS notification and faked events

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Message-ID: <20170529160400.GA28287@mail.corp.redhat.com>
Date:   Mon, 29 May 2017 18:04:00 +0200
From:   Benjamin Tissoires <benjamin.tissoires@...hat.com>
To:     Lv Zheng <lv.zheng@...el.com>
Cc:     "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <len.brown@...el.com>, Lv Zheng <zetalog@...il.com>,
        linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
        systemd-devel@...ts.freedesktop.org,
        Peter Hutterer <peter.hutterer@...-t.net>
Subject: Re: [RFC PATCH v3 1/5] ACPI: button: Add indication of BIOS
 notification and faked events

Hi Lv,

On May 27 2017 or thereabouts, Lv Zheng wrote:
> This patch adds a parameter to acpi_lid_notify_state() so that it can act
> differently against BIOS notification and kernel faked events.
> 
> Cc: <systemd-devel@...ts.freedesktop.org>
> Cc: Benjamin Tissoires <benjamin.tissoires@...hat.com>
> Cc: Peter Hutterer <peter.hutterer@...-t.net>
> Signed-off-by: Lv Zheng <lv.zheng@...el.com>
> ---

Answering to this one for the entire series:
last week was a mix of public holidays and PTO from me. I was only
able to review this series today, so sorry for the delay.

I still have a feeling this driver is far too engineered for a simple
input node. There are internal states, defers, mangle of events and too
many kernel parameters.

I still need to get my head around it, but the more I think of it, the
more I think the solution provided by Lennart in
https://github.com/systemd/systemd/issues/2807 is the simplest one:
when we are not sure about the state of the LID switch because _LID
might be wrong, we shouldn't export a LID input node.
Which means that all broken cases would be fixed by just a quirk
"unreliable lid switch".

Give me a day or two to get this in a better shape.

Cheers,
Benjamin