linux-kernel - Re: [PATCH v4 4/8] drm/panel: lvds: Implement .get

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Date:   Mon, 6 Jun 2022 12:08:46 -0700
From:   Stephen Boyd <swboyd@...omium.org>
To:     Chun-Kuang Hu <chunkuang.hu@...nel.org>,
        Hsin-Yi Wang <hsinyi@...omium.org>
Cc:     Hans de Goede <hdegoede@...hat.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Sam Ravnborg <sam@...nborg.org>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Matthias Brugger <matthias.bgg@...il.com>,
        dri-devel@...ts.freedesktop.org,
        linux-mediatek@...ts.infradead.org,
        Rob Clark <robdclark@...omium.org>,
        Douglas Anderson <dianders@...omium.org>,
        Rob Herring <robh+dt@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 4/8] drm/panel: lvds: Implement .get_orientation callback

Quoting Hsin-Yi Wang (2022-06-06 08:24:27)
> diff --git a/drivers/gpu/drm/panel/panel-lvds.c b/drivers/gpu/drm/panel/panel-lvds.c
> index f11252fb00fe..491b64c2c8d6 100644
> --- a/drivers/gpu/drm/panel/panel-lvds.c
> +++ b/drivers/gpu/drm/panel/panel-lvds.c
> @@ -99,15 +99,30 @@ static int panel_lvds_get_modes(struct drm_panel *panel,
>         drm_display_info_set_bus_formats(&connector->display_info,
>                                          &lvds->bus_format, 1);
>         connector->display_info.bus_flags = lvds->bus_flags;
> +
> +       /*
> +        * drm drivers are expected to call drm_panel_get_orientation() to get
> +        * panel's orientation then drm_connector_set_panel_orientation() to
> +        * set the property before drm_dev_register(). Otherwise there will be
> +        * a WARN_ON if orientation is set after drm is registered.
> +        */

Should this comment also be a "TODO: Remove once all drm drivers call
drm_connector_set_panel_orientation()"?

>         drm_connector_set_panel_orientation(connector, lvds->orientation);
>
>         return 1;
>  }
>
> +static enum drm_panel_orientation panel_lvds_get_orientation,(struct drm_panel *panel)

Stray comma here                                            ---^

> +{
> +       struct panel_lvds *lvds = to_panel_lvds(panel);
> +
> +       return lvds->orientation;
> +}
> +