[PATCH v2 13/50] drm/bridge: panel: Implement bridge connector operations

[Boris Brezillon]

On Tue, 20 Aug 2019 04:16:44 +0300
Laurent Pinchart <laurent.pinchart at ideasonboard.com> wrote:

> Implement the newly added bridge connector operations, allowing the
> usage of drm_bridge_panel with drm_bridge_connector.
> 
> Signed-off-by: Laurent Pinchart <laurent.pinchart at ideasonboard.com>
> ---
>  drivers/gpu/drm/bridge/panel.c | 18 +++++++++++++++++-
>  1 file changed, 17 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/bridge/panel.c b/drivers/gpu/drm/bridge/panel.c
> index f5b8e55301ac..1c7f5b648f05 100644
> --- a/drivers/gpu/drm/bridge/panel.c
> +++ b/drivers/gpu/drm/bridge/panel.c
> @@ -60,7 +60,7 @@ static int panel_bridge_attach(struct drm_bridge *bridge,
>  	int ret;
>  
>  	if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)
> -		return -EINVAL;
> +		return 0;
>  
>  	if (!bridge->encoder) {
>  		DRM_ERROR("Missing encoder\n");
> @@ -123,6 +123,18 @@ static void panel_bridge_post_disable(struct drm_bridge *bridge)
>  	drm_panel_unprepare(panel_bridge->panel);
>  }
>  
> +static int panel_bridge_get_modes(struct drm_bridge *bridge,
> +				  struct drm_connector *connector)
> +{
> +	struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge);
> +
> +	/*
> +	 * FIXME: drm_panel_get_modes() should take the connector as an
> +	 * argument.
> +	 */
> +	return drm_panel_get_modes(panel_bridge->panel);
> +}
> +
>  static const struct drm_bridge_funcs panel_bridge_bridge_funcs = {
>  	.attach = panel_bridge_attach,
>  	.detach = panel_bridge_detach,
> @@ -130,6 +142,7 @@ static const struct drm_bridge_funcs panel_bridge_bridge_funcs = {
>  	.enable = panel_bridge_enable,
>  	.disable = panel_bridge_disable,
>  	.post_disable = panel_bridge_post_disable,
> +	.get_modes = panel_bridge_get_modes,
>  };
>  
>  /**
> @@ -175,6 +188,9 @@ struct drm_bridge *drm_panel_bridge_add(struct drm_panel *panel,
>  #ifdef CONFIG_OF
>  	panel_bridge->bridge.of_node = panel->dev->of_node;
>  #endif
> +	panel_bridge->bridge.ops = DRM_BRIDGE_OP_MODES;
> +	/* FIXME: The panel should report its type. */
> +	panel_bridge->bridge.type = DRM_MODE_CONNECTOR_DPI;

Shouldn't we patch all panel drivers to expose this type before doing
this change? I mean, the connector type is exposed to userspace, and I
wouldn't be surprised if some userspace apps/libs decided to base their
output selection logic on this field.

>  
>  	drm_bridge_add(&panel_bridge->bridge);
>