It is not trivial to debug troubles at media graph build.
So, add print messages to help debug what's happening,
in the case of an error occurs.
Signed-off-by: Mauro Carvalho Chehab <mchehab+sams...@kernel.org>
---
drivers/media/v4l2-core/v4l2-mc.c | 80 +++++++++++++++++++++++--------
1 file changed, 61 insertions(+), 19 deletions(-)
diff --git a/drivers/media/v4l2-core/v4l2-mc.c
b/drivers/media/v4l2-core/v4l2-mc.c
index 3d868f071dd7..03f41c3fb8ec 100644
--- a/drivers/media/v4l2-core/v4l2-mc.c
+++ b/drivers/media/v4l2-core/v4l2-mc.c
@@ -63,8 +63,10 @@ int v4l2_mc_create_media_graph(struct media_device *mdev)
}
/* It should have at least one I/O entity */
- if (!io_v4l && !io_vbi && !io_swradio)
+ if (!io_v4l && !io_vbi && !io_swradio) {
+ dev_warn(mdev->dev, "Didn't find any I/O entity\n");
return -EINVAL;
+ }
/*
* Here, webcams are modelled on a very simple way: the sensor is
@@ -74,8 +76,10 @@ int v4l2_mc_create_media_graph(struct media_device *mdev)
* PC-consumer's hardware.
*/
if (is_webcam) {
- if (!io_v4l)
+ if (!io_v4l) {
+ dev_warn(mdev->dev, "Didn't find a
MEDIA_ENT_F_IO_V4L\n");
return -EINVAL;
+ }
media_device_for_each_entity(entity, mdev) {
if (entity->function != MEDIA_ENT_F_CAM_SENSOR)
@@ -83,16 +87,20 @@ int v4l2_mc_create_media_graph(struct media_device *mdev)
ret = media_create_pad_link(entity, 0,
io_v4l, 0,
MEDIA_LNK_FL_ENABLED);
- if (ret)
+ if (ret) {
+ dev_warn(mdev->dev, "Failed to create a sensor
link\n");
return ret;
+ }
}
if (!decoder)
return 0;
}
/* The device isn't a webcam. So, it should have a decoder */
- if (!decoder)
+ if (!decoder) {
+ dev_warn(mdev->dev, "Decoder not found\n");
return -EINVAL;
+ }
/* Link the tuner and IF video output pads */
if (tuner) {
@@ -101,32 +109,45 @@ int v4l2_mc_create_media_graph(struct media_device *mdev)
PAD_SIGNAL_ANALOG);
pad_sink = media_get_pad_index(if_vid, true,
PAD_SIGNAL_ANALOG);
- if (pad_source < 0 || pad_sink < 0)
+ if (pad_source < 0 || pad_sink < 0) {
+ dev_warn(mdev->dev, "Couldn't get tuner and/or
PLL pad(s): (%d, %d)\n",
+ pad_source, pad_sink);
return -EINVAL;
+ }
ret = media_create_pad_link(tuner, pad_source,
if_vid, pad_sink,
MEDIA_LNK_FL_ENABLED);
- if (ret)
+ if (ret) {
+ dev_warn(mdev->dev, "Couldn't create tuner->PLL
link)\n");
return ret;
+ }
pad_source = media_get_pad_index(if_vid, false,
PAD_SIGNAL_ANALOG);
pad_sink = media_get_pad_index(decoder, true,
PAD_SIGNAL_ANALOG);
- if (pad_source < 0 || pad_sink < 0)
+ if (pad_source < 0 || pad_sink < 0) {
+ dev_warn(mdev->dev, "get decoder and/or PLL
pad(s): (%d, %d)\n",
+ pad_source, pad_sink);
return -EINVAL;
+ }
ret = media_create_pad_link(if_vid, pad_source,
decoder, pad_sink,
MEDIA_LNK_FL_ENABLED);
- if (ret)
+ if (ret) {
+ dev_warn(mdev->dev, "couldn't link PLL to
decoder\n");
return ret;
+ }
} else {
pad_source = media_get_pad_index(tuner, false,
PAD_SIGNAL_ANALOG);
pad_sink = media_get_pad_index(decoder, true,
PAD_SIGNAL_ANALOG);
- if (pad_source < 0 || pad_sink < 0)
+ if (pad_source < 0 || pad_sink < 0) {
+ dev_warn(mdev->dev, "couldn't get tuner and/or
decoder pad(s): (%d, %d)\n",
+ pad_source, pad_sink);
return -EINVAL;
+ }
ret = media_create_pad_link(tuner, pad_source,
decoder, pad_sink,
MEDIA_LNK_FL_ENABLED);
@@ -139,13 +160,18 @@ int v4l2_mc_create_media_graph(struct media_device *mdev)
PAD_SIGNAL_AUDIO);
pad_sink = media_get_pad_index(if_aud, true,
PAD_SIGNAL_AUDIO);
- if (pad_source < 0 || pad_sink < 0)
+ if (pad_source < 0 || pad_sink < 0) {
+ dev_warn(mdev->dev, "couldn't get tuner and/or
decoder pad(s) for audio: (%d, %d)\n",
+ pad_source, pad_sink);
return -EINVAL;
+ }
ret = media_create_pad_link(tuner, pad_source,
if_aud, pad_sink,
MEDIA_LNK_FL_ENABLED);
- if (ret)
+ if (ret) {
+ dev_warn(mdev->dev, "couldn't link tuner->audio
PLL\n");
return ret;
+ }
} else {
if_aud = tuner;
}
@@ -155,35 +181,47 @@ int v4l2_mc_create_media_graph(struct media_device *mdev)
/* Create demod to V4L, VBI and SDR radio links */
if (io_v4l) {
pad_source = media_get_pad_index(decoder, false, PAD_SIGNAL_DV);
- if (pad_source < 0)
+ if (pad_source < 0) {
+ dev_warn(mdev->dev, "couldn't get decoder output pad
for V4L I/O\n");
return -EINVAL;
+ }
ret = media_create_pad_link(decoder, pad_source,
io_v4l, 0,
MEDIA_LNK_FL_ENABLED);
- if (ret)
+ if (ret) {
+ dev_warn(mdev->dev, "couldn't link decoder output to
V4L I/O\n");
return ret;
+ }
}
if (io_swradio) {
pad_source = media_get_pad_index(decoder, false, PAD_SIGNAL_DV);
- if (pad_source < 0)
+ if (pad_source < 0) {
+ dev_warn(mdev->dev, "couldn't get decoder output pad
for SDR\n");
return -EINVAL;
+ }
ret = media_create_pad_link(decoder, pad_source,
io_swradio, 0,
MEDIA_LNK_FL_ENABLED);
- if (ret)
+ if (ret) {
+ dev_warn(mdev->dev, "couldn't link decoder output to
SDR\n");
return ret;
+ }
}
if (io_vbi) {
pad_source = media_get_pad_index(decoder, false, PAD_SIGNAL_DV);
- if (pad_source < 0)
+ if (pad_source < 0) {
+ dev_warn(mdev->dev, "couldn't get decoder output pad
for VBI\n");
return -EINVAL;
+ }
ret = media_create_pad_link(decoder, pad_source,
io_vbi, 0,
MEDIA_LNK_FL_ENABLED);
- if (ret)
+ if (ret) {
+ dev_warn(mdev->dev, "couldn't link decoder output to
VBI\n");
return ret;
+ }
}
/* Create links for the media connectors */
@@ -195,8 +233,10 @@ int v4l2_mc_create_media_graph(struct media_device *mdev)
continue;
pad_sink = media_get_pad_index(tuner, true,
PAD_SIGNAL_ANALOG);
- if (pad_sink < 0)
+ if (pad_sink < 0) {
+ dev_warn(mdev->dev, "couldn't get tuner analog
pad sink\n");
return -EINVAL;
+ }
ret = media_create_pad_link(entity, 0, tuner,
pad_sink,
flags);
@@ -205,8 +245,10 @@ int v4l2_mc_create_media_graph(struct media_device *mdev)
case MEDIA_ENT_F_CONN_COMPOSITE:
pad_sink = media_get_pad_index(decoder, true,
PAD_SIGNAL_ANALOG);
- if (pad_sink < 0)
+ if (pad_sink < 0) {
+ dev_warn(mdev->dev, "couldn't get tuner analog
pad sink\n");
return -EINVAL;
+ }
ret = media_create_pad_link(entity, 0, decoder,
pad_sink,
flags);
--
2.17.1
