linux-kernel - Re: [PATCH 5/6] platform/chrome: cros_ec_lpc: Correct ACPI name for Framework Laptop

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Message-ID: <878qzz1222.fsf@jubnut.com>
Date: Fri, 24 May 2024 19:45:41 +0100
From: Ben Walsh <ben@...nut.com>
To: Dustin Howett <dustin@...ett.net>
Cc: Tzung-Bi Shih <tzungbi@...nel.org>, Benson Leung <bleung@...omium.org>,
 Guenter Roeck <groeck@...omium.org>, Kieran Levin <ktl@...me.work>, Thomas
 Weißschuh <linux@...ssschuh.net>, Mario Limonciello
 <mario.limonciello@....com>, chrome-platform@...ts.linux.dev,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/6] platform/chrome: cros_ec_lpc: Correct ACPI name for
 Framework Laptop

Dustin Howett <dustin@...ett.net> writes:

> On Fri, May 24, 2024 at 1:35 PM Ben Walsh <ben@...nut.com> wrote:
>>
>> I could add a new quirk which provides an alternative ACPI match table
>> to be used instead of the default. In the default case the match_table
>> will contain only "GOOG0004" as before. But in the Framework EC case the
>> match table will be "PNP0C09".
>
> My biggest concern with putting PNP0C09 in the direct match table is
> that it would cause cros_ec_lpcs to be loaded for *all* devices with
> an ACPI-compatible embedded controller; it would likely print an error
> and bail out early on, but it would still be unnecessary on 99% of
> platforms.

That's exactly what we're talking about: how to *avoid* putting PNP0C09
in the match table.

My original idea was to put it in the match table, but only allow a
match to proceed if Framework EC is detected by DMI.

My new idea is to not to put it in the match table *at all*, but to
provide a new match table if Framework EC is detected by DMI.