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

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Message-Id: <20230712103213.101770-1-manivannan.sadhasivam@linaro.org>
Date:   Wed, 12 Jul 2023 16:01:55 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     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,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Subject: [PATCH 00/14] UFS: Add OPP and interconnect support

Hi,

This series adds OPP (Operating Points) support to UFSHCD driver and
interconnect support to Qcom UFS driver.

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