[RFC] [media] imx: assume MEDIA_ENT_F_ATV_DECODER entities output video on pad 1

[Philipp Zabel]

The TVP5150 DT bindings specify a single output port (port 0) that
corresponds to the video output pad (pad 1, DEMOD_PAD_VID_OUT).

Signed-off-by: Philipp Zabel <p.zabel@xxxxxxxxxxxxxx>
---
I'm trying to get this to work with a TVP5150 analog TV decoder, and the
first problem is that this device doesn't have pad 0 as its single
output pad. Instead, as a MEDIA_ENT_F_ATV_DECODER entity, it has for
pads (input, video out, vbi out, audio out), and video out is pad 1,
whereas the device tree only defines a single port (0).
---

 drivers/staging/media/imx/imx-media-dev.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/staging/media/imx/imx-media-dev.c b/drivers/staging/media/imx/imx-media-dev.c
index 17e2386a3ca3a..c52d6ca797965 100644
--- a/drivers/staging/media/imx/imx-media-dev.c
+++ b/drivers/staging/media/imx/imx-media-dev.c
@@ -267,6 +267,15 @@ static int imx_media_create_link(struct imx_media_dev *imxmd,
 	source_pad = link->local_pad;
 	sink_pad = link->remote_pad;
 
+	/*
+	 * If the source subdev is an analog video decoder with a single source
+	 * port, assume that this port 0 corresponds to the DEMOD_PAD_VID_OUT
+	 * entity pad.
+	 */
+	if (source->entity.function == MEDIA_ENT_F_ATV_DECODER &&
+	    local_sd->num_sink_pads == 0 && local_sd->num_src_pads == 1)
+		source_pad = DEMOD_PAD_VID_OUT;
+
 	v4l2_info(&imxmd->v4l2_dev, "%s: %s:%d -> %s:%d\n", __func__,
 		  source->name, source_pad, sink->name, sink_pad);
 
-- 
2.11.0