linux-kernel - Re: [PATCH V1] arm64: dts: qcom: sc7180: Use maximum drive strength values for eMMC

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Message-ID: <CAD=FV=Wq-+Xzjc-o9p49pvf4A_q7L-THHp_wUQce47E+yMEgvA@mail.gmail.com>
Date:   Thu, 19 Aug 2021 06:44:27 -0700
From:   Doug Anderson <dianders@...gle.com>
To:     Shaik Sajida Bhanu <sbhanu@...eaurora.org>
Cc:     Adrian Hunter <adrian.hunter@...el.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Asutosh Das <asutoshd@...eaurora.org>,
        Sahitya Tummala <stummala@...eaurora.org>,
        pragalla@...eaurora.org, nitirawa@...eaurora.org,
        Ram Prakash Gupta <rampraka@...eaurora.org>,
        Sayali Lokhande <sayalil@...eaurora.org>,
        sartgarg@...eaurora.org, cang@...eaurora.org,
        Linux MMC List <linux-mmc@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>, Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Stephen Boyd <swboyd@...omium.org>,
        Matthias Kaehlcke <mka@...omium.org>
Subject: Re: [PATCH V1] arm64: dts: qcom: sc7180: Use maximum drive strength
 values for eMMC

Hi,

On Tue, Aug 17, 2021 at 6:58 AM Doug Anderson <dianders@...gle.com> wrote:
>
> >                 pinconf-data {
> >                         pins = "sdc1_data";
> >                         bias-pull-up;
> > -                       drive-strength = <10>;
> > +                       drive-strength = <16>;
>
> I could be convinced that this is the right thing to do, but I want to
> really make sure that it has had sufficient testing. Specifically as
> this patch is written we'll be updating the drive strength for all
> boards. Increasing the drive strength can sometimes introduce new
> problems (reflections, noise, ...) so we have to be confident that
> we're not breaking someone that used to work by increasing the drive
> strength here. How much has this been tested?

>From further discussion internally, it sounds as if this should be
fine and fixes more than just this one eMMC part. Thus:

Reviewed-by: Douglas Anderson <dianders@...omium.org>