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

[Dmitry Baryshkov]

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@xxxxxxxxxx/
> > [2] https://lore.kernel.org/all/20221117104957.254648-1-bmasney@xxxxxxxxxx/
> >
> > 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