Re: [PATCH v4 1/3] gpu: drm: separate panel orientation property creating and value setting

[Sean Paul <sean@poorly.run>]

On Wed, Apr 28, 2021 at 12:55 AM Hsin-Yi Wang <hsinyi@chromium.org> wrote:
>


Thank you for revising the patchset, this looks much better to me!


/snip

>
> diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
> index 7631f76e7f34..cda83314d7ad 100644
> --- a/drivers/gpu/drm/drm_connector.c
> +++ b/drivers/gpu/drm/drm_connector.c

/snip

> @@ -2173,8 +2173,8 @@ EXPORT_SYMBOL(drm_connector_set_vrr_capable_property);
>   * @connector: connector for which to set the panel-orientation property.
>   * @panel_orientation: drm_panel_orientation value to set
>   *
> - * This function sets the connector's panel_orientation and attaches
> - * a "panel orientation" property to the connector.
> + * This function sets the connector's panel_orientation value. If the property
> + * doesn't exist, it will create one first.

I still don't think this function should overload initialization and
assignment. I'd prefer we just removed the creation from
set_panel_orientation entirely so this WARN can't be hit.


>   *
>   * Calling this function on a connector where the panel_orientation has
>   * already been set is a no-op (e.g. the orientation has been overridden with
> @@ -2206,18 +2206,16 @@ int drm_connector_set_panel_orientation(
>
>         prop = dev->mode_config.panel_orientation_property;
>         if (!prop) {
> -               prop = drm_property_create_enum(dev, DRM_MODE_PROP_IMMUTABLE,
> -                               "panel orientation",
> -                               drm_panel_orientation_enum_list,
> -                               ARRAY_SIZE(drm_panel_orientation_enum_list));
> -               if (!prop)
> -                       return -ENOMEM;
> +               int ret;
>
> -               dev->mode_config.panel_orientation_property = prop;
> +               ret = drm_connector_init_panel_orientation_property(connector);
> +               if (ret)
> +                       return ret;
> +               prop = dev->mode_config.panel_orientation_property;
>         }
>
> -       drm_object_attach_property(&connector->base, prop,
> -                                  info->panel_orientation);
> +       drm_object_property_set_value(&connector->base, prop,
> +                                     info->panel_orientation);
>         return 0;
>  }
>  EXPORT_SYMBOL(drm_connector_set_panel_orientation);
> @@ -2225,7 +2223,7 @@ EXPORT_SYMBOL(drm_connector_set_panel_orientation);
>  /**
>   * drm_connector_set_panel_orientation_with_quirk -
>   *     set the connector's panel_orientation after checking for quirks
> - * @connector: connector for which to init the panel-orientation property.
> + * @connector: connector for which to set the panel-orientation property.
>   * @panel_orientation: drm_panel_orientation value to set
>   * @width: width in pixels of the panel, used for panel quirk detection
>   * @height: height in pixels of the panel, used for panel quirk detection
> @@ -2252,6 +2250,40 @@ int drm_connector_set_panel_orientation_with_quirk(
>  }
>  EXPORT_SYMBOL(drm_connector_set_panel_orientation_with_quirk);
>
> +/**
> + * drm_connector_init_panel_orientation_property -
> + *     create the connector's panel orientation property
> + *
> + * This function attaches a "panel orientation" property to the connector
> + * and initializes its value to DRM_MODE_PANEL_ORIENTATION_UNKNOWN.
> + *
> + * The value of the property can be set by drm_connector_set_panel_orientation()
> + * or drm_connector_set_panel_orientation_with_quirk() later.
> + *
> + * Returns:
> + * Zero on success, negative errno on failure.
> + */
> +int drm_connector_init_panel_orientation_property(
> +       struct drm_connector *connector)
> +{
> +       struct drm_device *dev = connector->dev;
> +       struct drm_property *prop;
> +
> +       prop = drm_property_create_enum(dev, DRM_MODE_PROP_IMMUTABLE,
> +                       "panel orientation",
> +                       drm_panel_orientation_enum_list,
> +                       ARRAY_SIZE(drm_panel_orientation_enum_list));
> +       if (!prop)
> +               return -ENOMEM;
> +
> +       dev->mode_config.panel_orientation_property = prop;
> +       drm_object_attach_property(&connector->base, prop,
> +                                  DRM_MODE_PANEL_ORIENTATION_UNKNOWN);
> +
> +       return 0;
> +}
> +EXPORT_SYMBOL(drm_connector_init_panel_orientation_property);
> +
>  int drm_connector_set_obj_prop(struct drm_mode_object *obj,
>                                     struct drm_property *property,
>                                     uint64_t value)
> diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
> index 1922b278ffad..4396c1c4a5db 100644
> --- a/include/drm/drm_connector.h
> +++ b/include/drm/drm_connector.h
> @@ -1696,6 +1696,8 @@ int drm_connector_set_panel_orientation_with_quirk(
>         struct drm_connector *connector,
>         enum drm_panel_orientation panel_orientation,
>         int width, int height);
> +int drm_connector_init_panel_orientation_property(
> +       struct drm_connector *connector);
>  int drm_connector_attach_max_bpc_property(struct drm_connector *connector,
>                                           int min, int max);
>
> --
> 2.31.1.498.g6c1eba8ee3d-goog
>
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