linux-kernel - Re: [RFC v6 0/2] Add SDHC interconnect bandwidth scaling

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Message-ID: <c17d8842-0e1d-0014-b909-3114952b350b@codeaurora.org>
Date:   Thu, 26 Mar 2020 14:52:22 +0530
From:   Rajendra Nayak <rnayak@...eaurora.org>
To:     Pradeep P V K <ppvk@...eaurora.org>, bjorn.andersson@...aro.org,
        adrian.hunter@...el.com, robh+dt@...nel.org,
        ulf.hansson@...aro.org, asutoshd@...eaurora.org,
        stummala@...eaurora.org, sayalil@...eaurora.org,
        rampraka@...eaurora.org, vbadigan@...eaurora.org, sboyd@...nel.org,
        georgi.djakov@...aro.org, mka@...omium.org
Cc:     linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        agross@...nel.org, linux-mmc-owner@...r.kernel.org,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Saravana Kannan <saravanak@...gle.com>
Subject: Re: [RFC v6 0/2] Add SDHC interconnect bandwidth scaling

Adding Viresh and Saravana,

On 3/23/2020 7:55 PM, Pradeep P V K wrote:
> Add interconnect bandwidths for SDHC driver using OPP framework that
> is required by SDHC driver based on the clock frequency and bus width
> of the card. Otherwise, the system clocks may run at minimum clock
> speed and thus affecting the performance.
> 
> This change is based on
> [RFC] mmc: host: sdhci-msm: Use the interconnect API
> (https://lkml.org/lkml/2018/10/11/499) and
> 
> [PATCH v6] Introduce Bandwidth OPPs for interconnects
> (https://lkml.org/lkml/2019/12/6/740)

Pradeep, since your series seems to depend on the above proposed bw bindings,
can you post the DT changes for the platform that you are testing these
patches on?

Please note that the above series is currently deadlocked [1][2] with no clear path
forward for now, so looking at how you plan to use this might throw some light onto
the requirements

[1] https://lkml.org/lkml/2020/1/14/511
[2] https://lkml.org/lkml/2020/3/20/106

> 
> Pradeep P V K (2):
>    mmc: sdhci-msm: Add interconnect bus bandwidth scaling support
>    dt-bindings: mmc: sdhci-msm: Add interconnect BW scaling strings
> 
>   .../devicetree/bindings/mmc/sdhci-msm.txt          |  18 ++
>   drivers/mmc/host/sdhci-msm.c                       | 240 ++++++++++++++++++++-
>   2 files changed, 254 insertions(+), 4 deletions(-)
> 

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