linux-kernel - Re: [PATCH v4 0/3] Use PSCI OS initiated mode for sc7280

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Message-ID: <CAPDyKFqSY9HJgKwuOqJPU5aA=wcAtDp91s0hkQye+dm=Wk=YDQ@mail.gmail.com>
Date:   Wed, 24 May 2023 11:56:28 +0200
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     andersson@...nel.org, Maulik Shah <quic_mkshah@...cinc.com>
Cc:     dianders@...omium.org, swboyd@...omium.org, wingers@...gle.com,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org, sudeep.holla@....com,
        jwerner@...omium.org, quic_lsrao@...cinc.com,
        quic_rjendra@...cinc.com
Subject: Re: [PATCH v4 0/3] Use PSCI OS initiated mode for sc7280

On Mon, 24 Apr 2023 at 13:09, Maulik Shah <quic_mkshah@...cinc.com> wrote:
>
> Changes in v4:
> - Add missing s-o-b line and reviewed by in patch 1
> - Address ulf's comments for error handling in patch 2
>
> Changes in v3:
> - Add new change to provide helper function dt_idle_pd_remove_topology()
> - Address ulf's comments for error handling
> - Add reviewed by ulf for devicetree change
>
> Changes in v2:
> - Add new change to Move enabling OSI mode after power domains creation
> - Fix compatible string to domains-idle-states for cluster idle state.
> - Update cover letter with some more details on OSI and PC mode
>   comparision
>
> The dependency [2] is now merged in trustedfirmware project.
>
> Stats comparision between OSI and PC mode are captured at [3] with
> usecase
> details, where during multiple CPUs online the residency in cluster idle
> state is better with OSI and also inline with single CPU mode. In PC
> mode
> with multiple CPUs cluster idle state residency is dropping compare to
> single CPU mode.
>
> Recording of this meeting is also available at [4].
>
> This change adds power-domains for cpuidle states to use PSCI OS
> initiated mode for sc7280.
>
> This change depends on external project changes [1] & [2] which are
> under review/discussion to add PSCI os-initiated support in Arm Trusted
> Firmware.
>
> I can update here once the dependency are in and change is ready to
> merge.
>
> [1] https://review.trustedfirmware.org/q/topic:psci-osi
> [2] https://review.trustedfirmware.org/c/TF-A/trusted-firmware-a/+/19487
> [3] https://www.trustedfirmware.org/docs/PSCI-OS-initiated.pdf
> [4] https://www.trustedfirmware.org/meetings/tf-a-technical-forum
>
> Maulik Shah (3):
>   cpuidle: dt_idle_genpd: Add helper function to remove genpd topology
>   cpuidle: psci: Move enabling OSI mode after power domains creation
>   arm64: dts: qcom: sc7280: Add power-domains for cpuidle states
>
>  arch/arm64/boot/dts/qcom/sc7280.dtsi  | 98 ++++++++++++++++++++-------
>  drivers/cpuidle/cpuidle-psci-domain.c | 39 ++++-------
>  drivers/cpuidle/dt_idle_genpd.c       | 24 +++++++
>  drivers/cpuidle/dt_idle_genpd.h       |  7 ++
>  4 files changed, 117 insertions(+), 51 deletions(-)
>

Looks like this series has not been queued up yet. Note that patch1
and patch2 are needed for stable kernels too. Moreover, patch3 (Qcom
DTS change) is dependent on patch 1 and patch2.

Therefore I suggest Bjorn to pick this up via the Qcom SoC tree.
Bjorn, is that okay for you?

Kind regards
Uffe