media: staging: media: imx: imx7-media-csi: Import imx_media_pipeline_set_stream()

To prepare for code refactoring, copy the
imx_media_pipeline_set_stream() helper used by this driver from
imx-media-utils.c. Rename the function to avoid name clashes, no
functional change intended.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Rui Miguel Silva <rmfrfs@gmail.com>
Tested-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

drivers/staging/media/imx/imx7-media-csi.c

@@ -1067,6 +1067,40 @@ static int imx7_csi_video_validate_fmt(struct imx7_csi *csi)
 	return 0;
 }
 
+/*
+ * Turn current pipeline streaming on/off starting from entity.
+ */
+static int imx7_csi_media_pipeline_set_stream(struct imx_media_dev *imxmd,
+					      struct media_entity *entity,
+					      bool on)
+{
+	struct v4l2_subdev *sd;
+	int ret = 0;
+
+	if (!is_media_entity_v4l2_subdev(entity))
+		return -EINVAL;
+	sd = media_entity_to_v4l2_subdev(entity);
+
+	mutex_lock(&imxmd->md.graph_mutex);
+
+	if (on) {
+		ret = __media_pipeline_start(entity, &imxmd->pipe);
+		if (ret)
+			goto out;
+		ret = v4l2_subdev_call(sd, video, s_stream, 1);
+		if (ret)
+			__media_pipeline_stop(entity);
+	} else {
+		v4l2_subdev_call(sd, video, s_stream, 0);
+		if (entity->pipe)
+			__media_pipeline_stop(entity);
+	}
+
+out:
+	mutex_unlock(&imxmd->md.graph_mutex);
+	return ret;
+}
+
 static int imx7_csi_video_start_streaming(struct vb2_queue *vq,
 					  unsigned int count)
 {
@@ -1081,7 +1115,8 @@ static int imx7_csi_video_start_streaming(struct vb2_queue *vq,
 		goto return_bufs;
 	}
 
-	ret = imx_media_pipeline_set_stream(&csi->imxmd, &csi->sd.entity, true);
+	ret = imx7_csi_media_pipeline_set_stream(&csi->imxmd, &csi->sd.entity,
+						 true);
 	if (ret) {
 		dev_err(csi->dev, "pipeline start failed with %d\n", ret);
 		goto return_bufs;
@@ -1107,7 +1142,8 @@ static void imx7_csi_video_stop_streaming(struct vb2_queue *vq)
 	unsigned long flags;
 	int ret;
 
-	ret = imx_media_pipeline_set_stream(&csi->imxmd, &csi->sd.entity, false);
+	ret = imx7_csi_media_pipeline_set_stream(&csi->imxmd, &csi->sd.entity,
+						 false);
 	if (ret)
 		dev_warn(csi->dev, "pipeline stop failed with %d\n", ret);