media: imx-mipi-csis: Use v4l2_subdev_enable_streams()

To support sources that implement the .enable_streams() and
.disable_streams() operations, replace the manual calls to the subdev
.s_stream() operation with the v4l2_subdev_enable_streams() and
v4l2_subdev_disable_streams() helpers. The helpers fall back to
.s_stream() if the source doesn't implement the new operations, so
backward compatibility is preserved.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Reviewed-by: Rui Miguel Silva <rmfrfs@gmail.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>

drivers/media/platform/nxp/imx-mipi-csis.c

@@ -320,7 +320,11 @@ struct mipi_csis_device {
 	struct v4l2_subdev sd;
 	struct media_pad pads[CSIS_PADS_NUM];
 	struct v4l2_async_notifier notifier;
-	struct v4l2_subdev *src_sd;
+
+	struct {
+		struct v4l2_subdev *sd;
+		const struct media_pad *pad;
+	} source;
 
 	struct v4l2_mbus_config_mipi_csi2 bus;
 	u32 clk_frequency;
@@ -597,7 +601,7 @@ static int mipi_csis_calculate_params(struct mipi_csis_device *csis,
 	u32 lane_rate;
 
 	/* Calculate the line rate from the pixel rate. */
-	link_freq = v4l2_get_link_freq(csis->src_sd->ctrl_handler,
+	link_freq = v4l2_get_link_freq(csis->source.sd->ctrl_handler,
 				       csis_fmt->width,
 				       csis->bus.num_data_lanes * 2);
 	if (link_freq < 0) {
@@ -958,7 +962,8 @@ static int mipi_csis_s_stream(struct v4l2_subdev *sd, int enable)
 	int ret;
 
 	if (!enable) {
-		v4l2_subdev_call(csis->src_sd, video, s_stream, 0);
+		v4l2_subdev_disable_streams(csis->source.sd,
+					    csis->source.pad->index, BIT(0));
 
 		mipi_csis_stop_stream(csis);
 		if (csis->debug.enable)
@@ -986,7 +991,8 @@ static int mipi_csis_s_stream(struct v4l2_subdev *sd, int enable)
 
 	mipi_csis_start_stream(csis, format, csis_fmt);
 
-	ret = v4l2_subdev_call(csis->src_sd, video, s_stream, 1);
+	ret = v4l2_subdev_enable_streams(csis->source.sd,
+					 csis->source.pad->index, BIT(0));
 	if (ret < 0)
 		goto err_stop;
 
@@ -1233,12 +1239,14 @@ static int mipi_csis_link_setup(struct media_entity *entity,
 	remote_sd = media_entity_to_v4l2_subdev(remote_pad->entity);
 
 	if (flags & MEDIA_LNK_FL_ENABLED) {
-		if (csis->src_sd)
+		if (csis->source.sd)
 			return -EBUSY;
 
-		csis->src_sd = remote_sd;
+		csis->source.sd = remote_sd;
+		csis->source.pad = remote_pad;
 	} else {
-		csis->src_sd = NULL;
+		csis->source.sd = NULL;
+		csis->source.pad = NULL;
 	}
 
 	return 0;