media: sun8i-a83t-mipi-csi2: Require both pads to be connected for streaming

The bridge needs both its pads connected to be able to stream data.
Enforcing this is useful to produce an error when no sensor is
connected.

Fixes: 576d196c ("media: sunxi: Add support for the A83T MIPI CSI-2 controller")
Signed-off-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

drivers/media/platform/sunxi/sun8i-a83t-mipi-csi2/sun8i_a83t_mipi_csi2.c

@@ -557,8 +557,10 @@ sun8i_a83t_mipi_csi2_bridge_setup(struct sun8i_a83t_mipi_csi2_device *csi2_dev)
 
 	/* Media Pads */
 
-	pads[SUN8I_A83T_MIPI_CSI2_PAD_SINK].flags = MEDIA_PAD_FL_SINK;
-	pads[SUN8I_A83T_MIPI_CSI2_PAD_SOURCE].flags = MEDIA_PAD_FL_SOURCE;
+	pads[SUN8I_A83T_MIPI_CSI2_PAD_SINK].flags = MEDIA_PAD_FL_SINK |
+						    MEDIA_PAD_FL_MUST_CONNECT;
+	pads[SUN8I_A83T_MIPI_CSI2_PAD_SOURCE].flags = MEDIA_PAD_FL_SOURCE |
+						      MEDIA_PAD_FL_MUST_CONNECT;
 
 	ret = media_entity_pads_init(&subdev->entity,
 				     SUN8I_A83T_MIPI_CSI2_PAD_COUNT, pads);