media: imx7-media-csi: get csi upstream endpoint

When the upstream endpoint is neither a mux nor a CSI2 module, just get
the source pad directly upstream from the CSI.
Reported-by: Sebastien Szymanski <sebastien.szymanski@armadeus.com>
Signed-off-by: Rui Miguel Silva <rui.silva@linaro.org>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

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

@@ -442,6 +442,14 @@ static int imx7_csi_get_upstream_endpoint(struct imx7_csi *csi,
 
 	src = &csi->src_sd->entity;
 
+	/*
+	 * if the source is neither a mux or csi2 get the one directly upstream
+	 * from this csi
+	 */
+	if (src->function != MEDIA_ENT_F_VID_IF_BRIDGE &&
+	    src->function != MEDIA_ENT_F_VID_MUX)
+		src = &csi->sd.entity;
+
 skip_video_mux:
 	/* get source pad of entity directly upstream from src */
 	pad = imx_media_pipeline_pad(src, 0, 0, true);