Re: [PATCH v3 1/8] drm/panel: Add an API drm_panel_get_orientation() to return panel orientation

[Doug Anderson]

Hi,

On Sun, Jun 5, 2022 at 9:47 PM Hsin-Yi Wang <hsinyi@xxxxxxxxxxxx> wrote:
>
> Panels usually call drm_connector_set_panel_orientation(), which is
> later than drm/kms driver calling drm_dev_register(). This leads to a
> WARN().
>
> The orientation property is known earlier. For example, some panels
> parse the property through device tree during probe.
>
> Add an API to return the property from panel to drm/kms driver, so the
> drivers are able to call drm_connector_set_panel_orientation() before
> drm_dev_register().
>
> Suggested-by: Hans de Goede <hdegoede@xxxxxxxxxx>
> Signed-off-by: Hsin-Yi Wang <hsinyi@xxxxxxxxxxxx>
> Reviewed-by: Hans de Goede <hdegoede@xxxxxxxxxx>
> ---
> v2->v3: no change
> ---
>  drivers/gpu/drm/drm_panel.c |  8 ++++++++
>  include/drm/drm_panel.h     | 10 ++++++++++
>  2 files changed, 18 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_panel.c b/drivers/gpu/drm/drm_panel.c
> index f634371c717a..4a512ca80673 100644
> --- a/drivers/gpu/drm/drm_panel.c
> +++ b/drivers/gpu/drm/drm_panel.c
> @@ -223,6 +223,14 @@ 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)
> +{
> +       if (panel && panel->funcs && panel->funcs->get_orientation)
> +               return panel->funcs->get_orientation(panel);
> +
> +       return DRM_MODE_PANEL_ORIENTATION_UNKNOWN;
> +}
> +EXPORT_SYMBOL(drm_panel_get_orientation);
>  #ifdef CONFIG_OF

nit: there used to be a blank line before the #ifdef but there no
longer is after your patch.

Other than that...

Reviewed-by: Douglas Anderson <dianders@xxxxxxxxxxxx>