[media] dvb_frontend: start media pipeline while thread is running

While the DVB thread is running, the media pipeline should be
streaming. This should prevent any attempt of using the analog
TV while digital TV is working, and vice-versa.

Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

drivers/media/dvb-core/dvb_frontend.c

@@ -131,6 +131,11 @@ struct dvb_frontend_private {
 	int quality;
 	unsigned int check_wrapped;
 	enum dvbfe_search algo_status;
+
+#if defined(CONFIG_MEDIA_CONTROLLER_DVB)
+	struct media_pipeline pipe;
+	struct media_entity *pipe_start_entity;
+#endif
 };
 
 static void dvb_frontend_wakeup(struct dvb_frontend *fe);
@@ -608,9 +613,9 @@ static void dvb_frontend_wakeup(struct dvb_frontend *fe)
  * or 0 if everything is OK, if no tuner is linked to the frontend or if the
  * mdev is NULL.
  */
+#ifdef CONFIG_MEDIA_CONTROLLER_DVB
 static int dvb_enable_media_tuner(struct dvb_frontend *fe)
 {
-#ifdef CONFIG_MEDIA_CONTROLLER_DVB
 	struct dvb_frontend_private *fepriv = fe->frontend_priv;
 	struct dvb_adapter *adapter = fe->dvb;
 	struct media_device *mdev = adapter->mdev;
@@ -618,10 +623,14 @@ static int dvb_enable_media_tuner(struct dvb_frontend *fe)
 	struct media_link *link, *found_link = NULL;
 	int i, ret, n_links = 0, active_links = 0;
 
+	fepriv->pipe_start_entity = NULL;
+
 	if (!mdev)
 		return 0;
 
 	entity = fepriv->dvbdev->entity;
+	fepriv->pipe_start_entity = entity;
+
 	for (i = 0; i < entity->num_links; i++) {
 		link = &entity->links[i];
 		if (link->sink->entity == entity) {
@@ -648,6 +657,7 @@ static int dvb_enable_media_tuner(struct dvb_frontend *fe)
 	}
 
 	source = found_link->source->entity;
+	fepriv->pipe_start_entity = source;
 	for (i = 0; i < source->num_links; i++) {
 		struct media_entity *sink;
 		int flags = 0;
@@ -672,9 +682,9 @@ static int dvb_enable_media_tuner(struct dvb_frontend *fe)
 				source->name, sink->name,
 				flags ? "ENABLED" : "disabled");
 	}
-#endif
 	return 0;
 }
+#endif
 
 static int dvb_frontend_thread(void *data)
 {
@@ -696,12 +706,19 @@ static int dvb_frontend_thread(void *data)
 	fepriv->wakeup = 0;
 	fepriv->reinitialise = 0;
 
+#ifdef CONFIG_MEDIA_CONTROLLER_DVB
 	ret = dvb_enable_media_tuner(fe);
 	if (ret) {
 		/* FIXME: return an error if it fails */
 		dev_info(fe->dvb->device,
 			"proceeding with FE task\n");
+	} else {
+		ret = media_entity_pipeline_start(fepriv->pipe_start_entity,
+						  &fepriv->pipe);
+		if (ret)
+			return ret;
 	}
+#endif
 
 	dvb_frontend_init(fe);
 
@@ -812,6 +829,11 @@ restart:
 		}
 	}
 
+#ifdef CONFIG_MEDIA_CONTROLLER_DVB
+	media_entity_pipeline_stop(fepriv->pipe_start_entity);
+	fepriv->pipe_start_entity = NULL;
+#endif
+
 	if (dvb_powerdown_on_sleep) {
 		if (fe->ops.set_voltage)
 			fe->ops.set_voltage(fe, SEC_VOLTAGE_OFF);