drm/mediatek: mtk_dsi: Create connector for bridges

Use the drm_bridge_connector helper to create a connector for pipelines
that use drm_bridge. This allows splitting connector operations across
multiple bridges when necessary, instead of having the last bridge in
the chain creating the connector and handling all connector operations
internally.

Signed-off-by: Enric Balletbo i Serra <[email protected]>
Acked-by: Sam Ravnborg <[email protected]>
Signed-off-by: Chun-Kuang Hu <[email protected]>

Author: Enric Balletbo i Serra

drivers/gpu/drm/mediatek/mtk_dsi.c

@@ -17,6 +17,7 @@
 
 #include <drm/drm_atomic_helper.h>
 #include <drm/drm_bridge.h>
+#include <drm/drm_bridge_connector.h>
 #include <drm/drm_mipi_dsi.h>
 #include <drm/drm_of.h>
 #include <drm/drm_panel.h>
@@ -183,6 +184,7 @@ struct mtk_dsi {
 	struct drm_encoder encoder;
 	struct drm_bridge bridge;
 	struct drm_bridge *next_bridge;
+	struct drm_connector *connector;
 	struct phy *phy;
 
 	void __iomem *regs;
@@ -974,10 +976,19 @@ static int mtk_dsi_encoder_init(struct drm_device *drm, struct mtk_dsi *dsi)
 	 */
 	dsi->encoder.possible_crtcs = 1;
 
-	ret = drm_bridge_attach(&dsi->encoder, &dsi->bridge, NULL, 0);
+	ret = drm_bridge_attach(&dsi->encoder, &dsi->bridge, NULL,
+				DRM_BRIDGE_ATTACH_NO_CONNECTOR);
 	if (ret)
 		goto err_cleanup_encoder;
 
+	dsi->connector = drm_bridge_connector_init(drm, &dsi->encoder);
+	if (IS_ERR(dsi->connector)) {
+		DRM_ERROR("Unable to create bridge connector\n");
+		ret = PTR_ERR(dsi->connector);
+		goto err_cleanup_encoder;
+	}
+	drm_connector_attach_encoder(dsi->connector, &dsi->encoder);
+
 	return 0;
 
 err_cleanup_encoder: