linux-kernel - Re: [PATCH v3 5/6] drm/msm/dsi: Take advantage of devm_regulator_bulk_get

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Date:   Wed, 3 Aug 2022 06:53:43 -0700
From:   Doug Anderson <dianders@...omium.org>
To:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc:     Rob Clark <robdclark@...il.com>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        Mark Brown <broonie@...nel.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        freedreno <freedreno@...ts.freedesktop.org>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...ainline.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>,
        Jonathan Marek <jonathan@...ek.ca>,
        José Expósito <jose.exposito89@...il.com>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Loic Poulain <loic.poulain@...aro.org>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        Rajeev Nandan <quic_rajeevny@...cinc.com>,
        Sean Paul <sean@...rly.run>,
        Sireesh Kodali <sireeshkodali1@...il.com>,
        Stephen Boyd <swboyd@...omium.org>,
        Vinod Koul <vkoul@...nel.org>,
        Vladimir Lypak <vladimir.lypak@...il.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 5/6] drm/msm/dsi: Take advantage of devm_regulator_bulk_get_const()

Hi,

On Wed, Aug 3, 2022 at 12:19 AM Dmitry Baryshkov
<dmitry.baryshkov@...aro.org> wrote:
>
> On 03/08/2022 01:37, Douglas Anderson wrote:
> > As of the commit 1de452a0edda ("regulator: core: Allow drivers to
> > define their init data as const") we no longer need to do copying of
> > regulator bulk data from initdata to something dynamic. Let's take
> > advantage of that.
> >
> > In addition to saving some code, this also moves us to using
> > ARRAY_SIZE() to specify how many regulators we have which is less
> > error prone.
> >
> > This gets rid of some layers of wrappers which makes it obvious that
> > we can get rid of an extra error print.
> > devm_regulator_bulk_get_const() prints errors for you so you don't
> > need an extra layer of printing.
> >
> > In all cases here I have preserved the old settings without any
> > investigation about whether the loads being set are sensible. In the
> > cases of some of the PHYs if several PHYs in the same file used
> > exactly the same settings I had them point to the same data structure.
> >
> > NOTE: Though I haven't done the math, this is likely an overall
> > savings in terms of "static const" data. We previously always
> > allocated space for 8 supplies. Each of these supplies took up 36
> > bytes of data (32 for name, 4 for an int).
> >
> > Signed-off-by: Douglas Anderson <dianders@...omium.org>
>
> Ah, so to array conversion is already done. That's great.
>
> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
>
>
> > ---
> >
> > Changes in v3:
> > - Do all the PHYs too.
>
> It would have been easier if DSI and DSI PHY were split to separate patches.

One of the earlier patches in the series (where we remove the
"disable" load) was harder to split since the DSI and DSI PHY code was
sharing a single data structure. Once I had one patch touching both at
the same time I figured I'd keep them all like that. If you need me to
rework them to be separate patches to make it easier to land then
please yell. Otherwise I'll assume it's OK.

-Doug