linux-kernel - Re: [RFC v3 00/10] DDR/L3 Scaling support on SDM845 and SC7180 SoCs

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Date:   Wed, 18 Mar 2020 02:13:15 +0530
From:   Sibi Sankar <sibis@...eaurora.org>
To:     viresh.kumar@...aro.org, sboyd@...nel.org,
        georgi.djakov@...aro.org, saravanak@...gle.com
Cc:     nm@...com, bjorn.andersson@...aro.org, agross@...nel.org,
        david.brown@...aro.org, robh+dt@...nel.org, mark.rutland@....com,
        rjw@...ysocki.net, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org, dianders@...omium.org, mka@...omium.org,
        vincent.guittot@...aro.org, amit.kucheria@...aro.org,
        ulf.hansson@...aro.org
Subject: Re: [RFC v3 00/10] DDR/L3 Scaling support on SDM845 and SC7180 SoCs

On 2020-01-28 01:33, Sibi Sankar wrote:
> This RFC series aims to extend cpu based scaling support to L3/DDR on
> SDM845 and SC7180 SoCs.
> 

Hey Viresh/Saravana,

Ping! Can you take a stab at reviewing
the series, it has been on the list for
a while now.

> Patches [1-3] - Blacklist SDM845 and SC7180 in cpufreq-dt-platdev
> Patches [5-7] - Hack in a way to add/remove multiple opp tables to
>                 a single device. I am yet to fix the debugfs to
> 		support multiple opp_tables per device but wanted to
> 		send what was working upstream to get an idea if multiple
> 		opp tables per device is a feature that will be useful
> 		upstream.
> Patches [9-10] - Add the cpu/cpu-ddr/cpu-l3 opp tables for SDM845
>                  and SC7180 SoCs.
> 
> v3:
>  * Migrated to using Saravana's opp-kBps bindings [1]
>  * Fixed some misc comments from Rajendra
>  * Added support for SC7180
> 
> v2:
>  * Incorporated Viresh's comments from:
>  
> https://lore.kernel.org/lkml/20190410102429.r6j6brm5kspmqxc3@vireshk-i7/
>  
> https://lore.kernel.org/lkml/20190410112516.gnh77jcwawvld6et@vireshk-i7/
>  * Dropped cpufreq-map passive governor
> 
> Git-branch: https://github.com/QuinAsura/linux/tree/lnext-012420
> 
> Some alternate ways of hosting the opp-tables:
> https://github.com/QuinAsura/linux/commit/50b92bfaadc8f9a0d1e12249646e018bd6d1a9d3
> https://github.com/QuinAsura/linux/commit/3d23d1eefd16ae6d9e3ef91e93e78749d8844e98
> Viresh didn't really like ^^ bindings and they dont really scale well. 
> Just
> including them here for completeness.
> 
> Depends on the following series:
> [1] https://patchwork.kernel.org/cover/11277199/
> [2] https://patchwork.kernel.org/cover/11055499/
> [3] https://patchwork.kernel.org/cover/11326381/
> 
> Sibi Sankar (10):
>   arm64: dts: qcom: sdm845: Add SoC compatible to MTP
>   cpufreq: blacklist SDM845 in cpufreq-dt-platdev
>   cpufreq: blacklist SC7180 in cpufreq-dt-platdev
>   OPP: Add and export helper to update voltage
>   opp: of: export _opp_of_get_opp_desc_node
>   opp: Allow multiple opp_tables to be mapped to a single device
>   opp: Remove multiple attached opp tables from a device
>   cpufreq: qcom: Update the bandwidth levels on frequency change
>   arm64: dts: qcom: sdm845: Add cpu OPP tables
>   arm64: dts: qcom: sc7180: Add cpu OPP tables
> 
>  arch/arm64/boot/dts/qcom/sc7180.dtsi    | 287 +++++++++++++++
>  arch/arm64/boot/dts/qcom/sdm845-mtp.dts |   2 +-
>  arch/arm64/boot/dts/qcom/sdm845.dtsi    | 453 ++++++++++++++++++++++++
>  drivers/cpufreq/cpufreq-dt-platdev.c    |   2 +
>  drivers/cpufreq/qcom-cpufreq-hw.c       | 246 +++++++++++--
>  drivers/opp/core.c                      | 111 +++++-
>  drivers/opp/of.c                        |   3 +-
>  drivers/opp/opp.h                       |   2 +
>  include/linux/pm_opp.h                  |  10 +
>  9 files changed, 1083 insertions(+), 33 deletions(-)

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