linux-kernel - Re: [PATCH 5/6] drm/panel: novatek-nt36672a: stop calling regulator_set

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Date: Fri, 3 May 2024 10:03:35 -0700
From: Doug Anderson <dianders@...omium.org>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc: Neil Armstrong <neil.armstrong@...aro.org>, Jessica Zhang <quic_jesszhan@...cinc.com>, 
	Sam Ravnborg <sam@...nborg.org>, Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
	Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, 
	David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>, 
	Matthias Kaehlcke <mka@...omium.org>, Harigovindan P <harigovi@...eaurora.org>, 
	Ritesh Kumar <quic_riteshk@...cinc.com>, Sumit Semwal <sumit.semwal@...aro.org>, 
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/6] drm/panel: novatek-nt36672a: stop calling
 regulator_set_load manually

Hi,

On Thu, Apr 4, 2024 at 3:08 AM Dmitry Baryshkov
<dmitry.baryshkov@...aro.org> wrote:
>
> Use .init_load_uA part of the bulk regulator API instead of calling
> register_set_load() manually.
>
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> ---
>  drivers/gpu/drm/panel/panel-novatek-nt36672a.c | 11 +++--------
>  1 file changed, 3 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/gpu/drm/panel/panel-novatek-nt36672a.c b/drivers/gpu/drm/panel/panel-novatek-nt36672a.c
> index 33fb3d715e54..3886372415c2 100644
> --- a/drivers/gpu/drm/panel/panel-novatek-nt36672a.c
> +++ b/drivers/gpu/drm/panel/panel-novatek-nt36672a.c
> @@ -605,21 +605,16 @@ static int nt36672a_panel_add(struct nt36672a_panel *pinfo)
>         struct device *dev = &pinfo->link->dev;
>         int i, ret;
>
> -       for (i = 0; i < ARRAY_SIZE(pinfo->supplies); i++)
> +       for (i = 0; i < ARRAY_SIZE(pinfo->supplies); i++) {
>                 pinfo->supplies[i].supply = nt36672a_regulator_names[i];
> +               pinfo->supplies[i].init_load_uA = nt36672a_regulator_enable_loads[i];
> +       }
>
>         ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(pinfo->supplies),
>                                       pinfo->supplies);
>         if (ret < 0)
>                 return dev_err_probe(dev, ret, "failed to get regulators\n");
>
> -       for (i = 0; i < ARRAY_SIZE(pinfo->supplies); i++) {
> -               ret = regulator_set_load(pinfo->supplies[i].consumer,
> -                                        nt36672a_regulator_enable_loads[i]);
> -               if (ret)
> -                       return dev_err_probe(dev, ret, "failed to set regulator enable loads\n");
> -       }

Thanks for the cleanup! I happened to notice this commit and I'm
curious why you didn't take the next step and move to
devm_regulator_bulk_get_const(). That would have allowed you to avoid
the "for" loop above that copies the data ;-)

-Doug