linux-kernel - Re: [PATCH 00/14] UFS: Add OPP and interconnect support

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Date:   Wed, 12 Jul 2023 17:57:50 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc:     vireshk@...nel.org, nm@...com, sboyd@...nel.org,
        myungjoo.ham@...sung.com, kyungmin.park@...sung.com,
        cw00.choi@...sung.com, andersson@...nel.org,
        konrad.dybcio@...aro.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        quic_asutoshd@...cinc.com, quic_cang@...cinc.com,
        quic_nitirawa@...cinc.com, quic_narepall@...cinc.com,
        quic_bhaskarv@...cinc.com, quic_richardp@...cinc.com,
        quic_nguyenb@...cinc.com, quic_ziqichen@...cinc.com,
        bmasney@...hat.com, krzysztof.kozlowski@...aro.org
Subject: Re: [PATCH 00/14] UFS: Add OPP and interconnect support

On Wed, Jul 12, 2023 at 03:18:38PM +0300, Dmitry Baryshkov wrote:
> On 12/07/2023 13:40, Manivannan Sadhasivam wrote:
> > On Wed, Jul 12, 2023 at 04:01:55PM +0530, Manivannan Sadhasivam wrote:
> > > Hi,
> > > 
> > > This series adds OPP (Operating Points) support to UFSHCD driver and
> > > interconnect support to Qcom UFS driver.
> > > 
> > 
> > Missed to cc SCSI folks. Will be resending this series. Sorry for the noise.
> 
> I'd say, there is a need for the resend anyway, the series got duplicate
> patch indices.
> 

Yeah, my script screwed up. Will wait for some time to get comments before
resending though.

- Mani

> > 
> > - Mani
> > 
> > > Motivation behind adding OPP support is to scale both clocks as well as
> > > regulators/performance state dynamically. Currently, UFSHCD just scales
> > > clock frequency during runtime with the help of "freq-table-hz" property
> > > defined in devicetree. With the addition of OPP tables in devicetree (as
> > > done for Qcom SDM845 and SM8250 SoCs in this series) UFSHCD can now scale
> > > both clocks and performance state of power domain which helps in power
> > > saving.
> > > 
> > > For the addition of OPP support to UFSHCD, there are changes required to
> > > the OPP framework and devfreq drivers which are also added in this series.
> > > 
> > > Finally, interconnect support is added to Qcom UFS driver for scaling the
> > > interconnect path dynamically. This is required to avoid boot crash in
> > > recent SoCs and also to save power during runtime. More information is
> > > available in patch 13/13.
> > > 
> > > Credits
> > > =======
> > > 
> > > This series is a continuation of previous work by Krzysztof Kozlowski [1]
> > > and Brian Masney [2]. Ideally, this could've split into two series (OPP
> > > and interconnect) but since there will be a dependency in the devicetree,
> > > I decided to keep them in a single series.
> > > 
> > > Testing
> > > =======
> > > 
> > > This series is tested on 96Boards RB3 (SDM845 SoC) and RB5 (SM8250 SoC)
> > > development boards.
> > > 
> > > Merging Strategy
> > > ================
> > > 
> > > An immutable branch might be required between OPP and SCSI trees because of
> > > the API dependency (devfreq too). And I leave it up to the maintainers to
> > > decide.
> > > 
> > > Thanks,
> > > Mani
> > > 
> > > [1] https://lore.kernel.org/all/20220513061347.46480-1-krzysztof.kozlowski@linaro.org/
> > > [2] https://lore.kernel.org/all/20221117104957.254648-1-bmasney@redhat.com/
> > > 
> > > Krzysztof Kozlowski (2):
> > >    dt-bindings: ufs: common: add OPP table
> > >    arm64: dts: qcom: sdm845: Add OPP table support to UFSHC
> > > 
> > > Manivannan Sadhasivam (12):
> > >    dt-bindings: opp: Increase maxItems for opp-hz property
> > >    arm64: dts: qcom: sdm845: Add missing RPMh power domain to GCC
> > >    arm64: dts: qcom: sdm845: Fix the min frequency of "ice_core_clk"
> > >    arm64: dts: qcom: sm8250: Add OPP table support to UFSHC
> > >    OPP: Introduce dev_pm_opp_find_freq_{ceil/floor}_indexed() APIs
> > >    OPP: Introduce dev_pm_opp_get_freq_indexed() API
> > >    PM / devfreq: Switch to dev_pm_opp_find_freq_{ceil/floor}_indexed()
> > >      APIs
> > >    scsi: ufs: core: Add OPP support for scaling clocks and regulators
> > >    scsi: ufs: host: Add support for parsing OPP
> > >    arm64: dts: qcom: sdm845: Add interconnect paths to UFSHC
> > >    arm64: dts: qcom: sm8250: Add interconnect paths to UFSHC
> > >    scsi: ufs: qcom: Add support for scaling interconnects
> > > 
> > >   .../devicetree/bindings/opp/opp-v2-base.yaml  |   2 +-
> > >   .../devicetree/bindings/ufs/ufs-common.yaml   |  34 ++++-
> > >   arch/arm64/boot/dts/qcom/sdm845.dtsi          |  47 ++++--
> > >   arch/arm64/boot/dts/qcom/sm8250.dtsi          |  43 ++++--
> > >   drivers/devfreq/devfreq.c                     |  14 +-
> > >   drivers/opp/core.c                            |  76 ++++++++++
> > >   drivers/ufs/core/ufshcd.c                     | 142 ++++++++++++++----
> > >   drivers/ufs/host/ufs-qcom.c                   | 131 +++++++++++++++-
> > >   drivers/ufs/host/ufs-qcom.h                   |   3 +
> > >   drivers/ufs/host/ufshcd-pltfrm.c              | 116 ++++++++++++++
> > >   include/linux/pm_opp.h                        |  26 ++++
> > >   include/ufs/ufshcd.h                          |   4 +
> > >   12 files changed, 574 insertions(+), 64 deletions(-)
> > > 
> > > -- 
> > > 2.25.1
> > > 
> > 
> 
> -- 
> With best wishes
> Dmitry
> 

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