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Date:   Wed, 24 May 2023 19:45:46 -0700
From:   Bjorn Andersson <andersson@kernel.org>
To:     Ulf Hansson <ulf.hansson@linaro.org>
Cc:     Maulik Shah <quic_mkshah@quicinc.com>, dianders@chromium.org,
        swboyd@chromium.org, wingers@google.com,
        linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-pm@vger.kernel.org, sudeep.holla@arm.com,
        jwerner@chromium.org, quic_lsrao@quicinc.com,
        quic_rjendra@quicinc.com
Subject: Re: [PATCH v4 0/3] Use PSCI OS initiated mode for sc7280
Message-ID: <20230525024546.ug6nbrmkgx2alerc@ripper>
References: <20230424110933.3908-1-quic_mkshah@quicinc.com>
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On Wed, May 24, 2023 at 11:56:28AM +0200, Ulf Hansson wrote:
> On Mon, 24 Apr 2023 at 13:09, Maulik Shah <quic_mkshah@quicinc.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?
> 

Sorry, this fell between the chairs after you pointed me to it...

I can certainly pick the 3 patches through my tree, but are they fixing
any current regressions, or is it just that we need the first two
patches to land before the 3rd patch?

I also presume the 3rd patch is only needed when paired with the new
ATF?

Regards,
Bjorn