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

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Message-ID: <228e5e34-6467-a75b-129d-2b37b32acf13@linaro.org>
Date:   Wed, 3 Aug 2022 10:18:57 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Douglas Anderson <dianders@...omium.org>,
        Rob Clark <robdclark@...il.com>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>
Cc:     dri-devel@...ts.freedesktop.org, Mark Brown <broonie@...nel.org>,
        linux-arm-msm@...r.kernel.org, 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>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 5/6] drm/msm/dsi: Take advantage of
 devm_regulator_bulk_get_const()

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.

> - Get rid of error print after devm_regulator_bulk_get_const().
> - Just directly call the bulk commands; get rid of the wrapper.
> - Update commit message to point at the git hash of the regulator change.
> 
> Changes in v2:
> - ("Take advantage of devm_regulator_bulk_get_const") new for v2.
> 
>   drivers/gpu/drm/msm/dsi/dsi.h                 |  12 --
>   drivers/gpu/drm/msm/dsi/dsi_cfg.c             | 172 +++++++++---------
>   drivers/gpu/drm/msm/dsi/dsi_cfg.h             |   3 +-
>   drivers/gpu/drm/msm/dsi/dsi_host.c            |  42 ++---
>   drivers/gpu/drm/msm/dsi/phy/dsi_phy.c         |  37 +---
>   drivers/gpu/drm/msm/dsi/phy/dsi_phy.h         |   5 +-
>   drivers/gpu/drm/msm/dsi/phy/dsi_phy_10nm.c    |  20 +-
>   drivers/gpu/drm/msm/dsi/phy/dsi_phy_14nm.c    |  32 ++--
>   drivers/gpu/drm/msm/dsi/phy/dsi_phy_20nm.c    |  14 +-
>   drivers/gpu/drm/msm/dsi/phy/dsi_phy_28nm.c    |  28 +--
>   .../gpu/drm/msm/dsi/phy/dsi_phy_28nm_8960.c   |  12 +-
>   drivers/gpu/drm/msm/dsi/phy/dsi_phy_7nm.c     |  32 ++--
>   12 files changed, 167 insertions(+), 242 deletions(-)

-- 
With best wishes
Dmitry