linux-kernel - Re: [RFC PATCH 0/3] ACPI: platform_profile: Let drivers dynamically refresh choices

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Message-ID: <CALiyAonc81o1FreDaWiik3XaqKYVf=wYHX+vaE2_1w66LhJTnA@mail.gmail.com>
Date: Tue, 7 Jan 2025 18:44:13 +0530
From: Hridesh MG <hridesh699@...il.com>
To: Mark Pearson <mpearson-lenovo@...ebb.ca>
Cc: Kurt Borja <kuurtb@...il.com>, 
	"platform-driver-x86@...r.kernel.org" <platform-driver-x86@...r.kernel.org>, josh@...huagrisham.com, 
	"Derek J . Clark" <derekjohn.clark@...il.com>, "Rafael J. Wysocki" <rafael@...nel.org>, 
	Len Brown <lenb@...nel.org>, Maximilian Luz <luzmaximilian@...il.com>, 
	Hans de Goede <hdegoede@...hat.com>, Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>, 
	Lee Chun-Yi <jlee@...e.com>, Shyam Sundar S K <Shyam-sundar.S-k@....com>, 
	Corentin Chary <corentin.chary@...il.com>, "Luke D . Jones" <luke@...nes.dev>, 
	Lyndon Sanche <lsanche@...deno.ca>, Ike Panhc <ike.pan@...onical.com>, 
	Henrique de Moraes Holschuh <hmh@....eng.br>, Armin Wolf <W_Armin@....de>, 
	"Limonciello, Mario" <mario.limonciello@....com>, Colin Ian King <colin.i.king@...il.com>, 
	Alexis Belmonte <alexbelm48@...il.com>, Uwe Kleine-König <u.kleine-koenig@...libre.com>, 
	Ai Chao <aichao@...inos.cn>, Gergo Koteles <soyer@....hu>, 
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>, linux-kernel@...r.kernel.org, 
	Dell.Client.Kernel@...l.com, ibm-acpi-devel@...ts.sourceforge.net
Subject: Re: [RFC PATCH 0/3] ACPI: platform_profile: Let drivers dynamically
 refresh choices

On Tue, Jan 7, 2025 at 7:49 AM Mark Pearson <mpearson-lenovo@...ebb.ca> wrote:
>
> Hi Kurt,
>
> On Sun, Jan 5, 2025, at 11:45 PM, Kurt Borja wrote:
> > Hello,
> >
> > Some drivers may need to dynamically modify their selected `choices`.
> > Such is the case of the acer-wmi driver, which implemented their own
> > profile cycling method, because users expect different profiles to be
> > available whether the laptop is on AC or not [1].
> >
> > These series would allow acer-wmi to simplify this custom cycling method
> > to use platform_profile_cycle(), as it's already being proposed in these
> > series [2]; without changing expected behaviors, by refreshing their
> > selected choices on AC connect/disconnect events, which would also solve
> > this discussion [3].
> >
> > Additionally, I think the platform_profile_ops approach would enable us
> > to hide the platform_profile_handler in the future, and instead just pass
> > the class device to get/set methods like the HWMON subsystem does.
> >
> > I think having this kind of flexibility is valuable. Let me know what you
> > think!
> >
>
> I personally would love to see how this would be used for the acer issue highlighted to see how it would work out. It feels like the series is short a patch :)

I do think that having this flexibility would be good, as i was
considering manually clearing the set bits and calling platform_notify
for the acer series, but in my specific case (for devices using the
predator v4 interface) it was found that the hardware was responsive
to all profiles regardless of AC/battery mode so it made sense to
leave this kind of artificial limiting of profiles to the
userspace--similar to how the Windows driver handles it through the
Nitro Sense app.

I feel like users should have the power to utilize their hardware in
the way they want it to, though if there is a compelling reason to
limit the profiles then i'd be more than happy to add this to the
series :)


--
Hridesh MG