linux-kernel - Re: [PATCH 0/4] x86: Trust firmware a bit more about presence of 8042

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Date:   Fri, 9 Dec 2016 21:54:33 -0200
From:   Marcos Paulo de Souza <marcos.souza.org@...il.com>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org, linux-input@...r.kernel.org,
        Takashi Iwai <tiwai@...e.de>
Subject: Re: [PATCH 0/4] x86: Trust firmware a bit more about presence of 8042

Hi Dmitry,

On Fri, Dec 09, 2016 at 12:57:37PM -0800, Dmitry Torokhov wrote:
> Hi,
> 
> Historically we did not trust PNP data regarding keyboard controllers on
> X86, but more and more boards get upset with us if they try to tell us that
> there is no keyboard controller and we still go and try to poke at where we
> think it might be. To work around this issue let's have a bit more faith in
> BIOS data, and if [lack] of PNP devices for mouse and keyboard matches whet
> firmware (basically ACPI FADT) tells us, let's abort i8042 probe.
> 
> We add a new flag (enum) to x86_platform.legacy structure so we can
> distinguish between cases where platform/subarch never has 8042 (such as
> MID platform) and cases where firmware says that it is not there, so that
> i8042 driver can either abort immediately or go and check for presence of
> PNP devices. We also remove x86_platform.i8042_detect() as it is no longer
> used (platforms can set value of x86_platform.legacy.i8042 as needed in
> quirks).
> 
> If you are OK with arch/x86 changes please apply together with the input
> part.

Looks very good, better than my initial idea of adding more code into i8042_detect.

Acked-by: Marcos Paulo de Souza <marcos.souza.org@...il.com>

> 
> Thanks,
> Dmitry
> 
> Dmitry Torokhov (4):
>   x86/init: add i8042 state to the platform data
>   Input: i8042 - trust firmware a bit more when probing on X86
>   x86/init: remove i8042_detect() form platform ops
>   x86/init: fix a couple typos in arch/x86/include/asm/x86_init.h
> 
>  arch/x86/include/asm/x86_init.h         | 26 +++++++++++++++++++++-----
>  arch/x86/kernel/acpi/boot.c             |  7 +++++++
>  arch/x86/kernel/platform-quirks.c       |  5 +++++
>  arch/x86/kernel/x86_init.c              |  2 --
>  arch/x86/platform/ce4100/ce4100.c       |  6 ------
>  arch/x86/platform/intel-mid/intel-mid.c |  7 -------
>  drivers/input/serio/i8042-x86ia64io.h   | 10 +++++++---
>  7 files changed, 40 insertions(+), 23 deletions(-)
> 
> -- 
> 2.8.0.rc3.226.g39d4020
>