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

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Date:   Thu, 26 Mar 2020 11:33:44 -0700
From:   Saravana Kannan <saravanak@...gle.com>
To:     Rajendra Nayak <rnayak@...eaurora.org>
Cc:     Pradeep P V K <ppvk@...eaurora.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        adrian.hunter@...el.com, Rob Herring <robh+dt@...nel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>, asutoshd@...eaurora.org,
        stummala@...eaurora.org, sayalil@...eaurora.org,
        rampraka@...eaurora.org, vbadigan@...eaurora.org,
        Stephen Boyd <sboyd@...nel.org>,
        Georgi Djakov <georgi.djakov@...aro.org>, mka@...omium.org,
        linux-mmc@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        linux-arm-msm@...r.kernel.org,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>, Andy Gross <agross@...nel.org>,
        linux-mmc-owner@...r.kernel.org,
        Viresh Kumar <viresh.kumar@...aro.org>
Subject: Re: [RFC v6 0/2] Add SDHC interconnect bandwidth scaling

On Thu, Mar 26, 2020 at 2:22 AM Rajendra Nayak <rnayak@...eaurora.org> wrote:
>
> 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

Sorry, not deadlocked. Just kinda busy. For [1] I believe I agreed
with Viresh later on. I'll respond to [2] soon.

-Saravana

>
> >
> > 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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