linux-kernel - Re: [RFC PATCH v4 6/8] intel_idle: Provide enter

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Message-ID: <CAJZ5v0gKSBqQCV-zj7tNfv4pEHYp90bjXBn_EN_=Nxh=ok7snw@mail.gmail.com>
Date: Mon, 25 Nov 2024 15:50:13 +0100
From: "Rafael J. Wysocki" <rafael@...nel.org>
To: Patryk Wlazlyn <patryk.wlazlyn@...ux.intel.com>
Cc: "Rafael J. Wysocki" <rafael@...nel.org>, x86@...nel.org, linux-kernel@...r.kernel.org, 
	linux-pm@...r.kernel.org, rafael.j.wysocki@...el.com, len.brown@...el.com, 
	artem.bityutskiy@...ux.intel.com, dave.hansen@...ux.intel.com, 
	peterz@...radead.org, tglx@...utronix.de, gautham.shenoy@....com
Subject: Re: [RFC PATCH v4 6/8] intel_idle: Provide enter_dead() handler for SRF

On Mon, Nov 25, 2024 at 3:48 PM Patryk Wlazlyn
<patryk.wlazlyn@...ux.intel.com> wrote:
>
> > Is this still the case with the latest firmware?
> >
> > If so, this could be the second patch in the series if [1-3/7] are dropped.
> >
> > Otherwise, I don't think it is needed any more.
> I discussed this case with Artem or Len off-list, before.
> The idea is to add it for SRF too, to make sure that you get PC6, even on old firmware.
>
> Just as reminder - the whole patch series is here to guard for future platforms too.

This actually is its main purpose.

> The SRF is just the one the problem was observed on.

So if you change intel_idle to provide :enter_dead() for all CPUs on
all platforms, the SRF-specific patch won't be necessary any more.