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

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Date:   Wed, 12 Jul 2023 15:18:38 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        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
Cc:     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 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.

> 
> - 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