linux-kernel - Re: [PATCH v4 1/8] drm/panel: Add an API drm_panel_get_orientation() to return panel orientation

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Date:   Mon, 6 Jun 2022 12:06:29 -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 1/8] drm/panel: Add an API drm_panel_get_orientation()
 to return panel orientation

Quoting Hsin-Yi Wang (2022-06-06 08:24:24)
> diff --git a/drivers/gpu/drm/drm_panel.c b/drivers/gpu/drm/drm_panel.c
> index f634371c717a..e12056cfeca8 100644
> --- a/drivers/gpu/drm/drm_panel.c
> +++ b/drivers/gpu/drm/drm_panel.c
> @@ -223,6 +223,15 @@ int drm_panel_get_modes(struct drm_panel *panel,
>  }
>  EXPORT_SYMBOL(drm_panel_get_modes);
>
> +enum drm_panel_orientation drm_panel_get_orientation(struct drm_panel *panel)

Should 'panel' be marked const to indicate that it can't be modified?

> +{
> +       if (panel && panel->funcs && panel->funcs->get_orientation)
> +               return panel->funcs->get_orientation(panel);