Just add some debug prints for V4L2 async sub-device matching process.
These might come useful in figuring out why things don't work as expected.
Signed-off-by: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>
---
drivers/media/v4l2-core/v4l2-async.c | 71 ++++++++++++++++++++++++----
1 file changed, 63 insertions(+), 8 deletions(-)
diff --git a/drivers/media/v4l2-core/v4l2-async.c b/drivers/media/v4l2-core/v4l2-async.c
index 7831bc8792904..c5781124337af 100644
--- a/drivers/media/v4l2-core/v4l2-async.c
+++ b/drivers/media/v4l2-core/v4l2-async.c
@@ -77,6 +77,17 @@ static bool match_i2c(struct v4l2_async_notifier *notifier,
#endif
}
+static struct device *notifier_dev(struct v4l2_async_notifier *notifier)
+{
+ if (notifier->sd)
+ return notifier->sd->dev;
+
+ if (notifier->v4l2_dev)
+ return notifier->v4l2_dev->dev;
+
+ return NULL;
+}
+
static bool
match_fwnode_one(struct v4l2_async_notifier *notifier,
struct v4l2_subdev *sd, struct fwnode_handle *sd_fwnode,
@@ -88,13 +99,20 @@ match_fwnode_one(struct v4l2_async_notifier *notifier,
bool sd_fwnode_is_ep;
struct device *dev;
+ dev_dbg(notifier_dev(notifier),
+ "v4l2-async: fwnode match: need %pfw, trying %pfw\n",
+ sd_fwnode, asd->match.fwnode);
+
/*
* Both the subdev and the async subdev can provide either an endpoint
* fwnode or a device fwnode. Start with the simple case of direct
* fwnode matching.
*/
- if (sd_fwnode == asd->match.fwnode)
+ if (sd_fwnode == asd->match.fwnode) {
+ dev_dbg(notifier_dev(notifier),
+ "v4l2-async: direct match found\n");
return true;
+ }
/*
* Otherwise, check if the sd fwnode and the asd fwnode refer to an
@@ -107,8 +125,11 @@ match_fwnode_one(struct v4l2_async_notifier *notifier,
sd_fwnode_is_ep = fwnode_graph_is_endpoint(sd_fwnode);
asd_fwnode_is_ep = fwnode_graph_is_endpoint(asd->match.fwnode);
- if (sd_fwnode_is_ep == asd_fwnode_is_ep)
+ if (sd_fwnode_is_ep == asd_fwnode_is_ep) {
+ dev_dbg(notifier_dev(notifier),
+ "v4l2-async: direct match not found\n");
return false;
+ }
/*
* The sd and asd fwnodes are of different types. Get the device fwnode
@@ -122,10 +143,17 @@ match_fwnode_one(struct v4l2_async_notifier *notifier,
other_fwnode = sd_fwnode;
}
+ dev_dbg(notifier_dev(notifier),
+ "v4l2-async: fwnode compat match: need %pfw, trying %pfw\n",
+ dev_fwnode, other_fwnode);
+
fwnode_handle_put(dev_fwnode);
- if (dev_fwnode != other_fwnode)
+ if (dev_fwnode != other_fwnode) {
+ dev_dbg(notifier_dev(notifier),
+ "v4l2-async: compat match not found\n");
return false;
+ }
/*
* We have a heterogeneous match. Retrieve the struct device of the side
@@ -145,12 +173,18 @@ match_fwnode_one(struct v4l2_async_notifier *notifier,
dev->driver->name);
}
+ dev_dbg(notifier_dev(notifier), "v4l2-async: compat match found\n");
+
return true;
}
static bool match_fwnode(struct v4l2_async_notifier *notifier,
struct v4l2_subdev *sd, struct v4l2_async_subdev *asd)
{
+ dev_dbg(notifier_dev(notifier),
+ "v4l2-async: matching for notifier %pfw, sd fwnode %pfw\n",
+ dev_fwnode(notifier_dev(notifier)), sd->fwnode);
+
if (match_fwnode_one(notifier, sd, sd->fwnode, asd))
return true;
@@ -158,6 +192,9 @@ static bool match_fwnode(struct v4l2_async_notifier *notifier,
if (IS_ERR_OR_NULL(sd->fwnode->secondary))
return false;
+ dev_dbg(notifier_dev(notifier),
+ "v4l2-async: trying secondary fwnode match\n");
+
return match_fwnode_one(notifier, sd, sd->fwnode->secondary, asd);
}
@@ -271,22 +308,33 @@ v4l2_async_nf_can_complete(struct v4l2_async_notifier *notifier)
static int
v4l2_async_nf_try_complete(struct v4l2_async_notifier *notifier)
{
+ struct v4l2_async_notifier *__notifier = notifier;
+
/* Quick check whether there are still more sub-devices here. */
if (!list_empty(¬ifier->waiting))
return 0;
+ if (notifier->sd)
+ dev_dbg(notifier_dev(notifier),
+ "v4l2-async: trying to complete\n");
+
/* Check the entire notifier tree; find the root notifier first. */
while (notifier->parent)
notifier = notifier->parent;
/* This is root if it has v4l2_dev. */
- if (!notifier->v4l2_dev)
+ if (!notifier->v4l2_dev) {
+ dev_dbg(notifier_dev(__notifier),
+ "v4l2-async: V4L2 device not available\n");
return 0;
+ }
/* Is everything ready? */
if (!v4l2_async_nf_can_complete(notifier))
return 0;
+ dev_dbg(notifier_dev(__notifier), "v4l2-async: complete\n");
+
return v4l2_async_nf_call_complete(notifier);
}
@@ -350,6 +398,9 @@ static int v4l2_async_match_notify(struct v4l2_async_notifier *notifier,
/* Move from the global subdevice list to notifier's done */
list_move(&sd->async_list, ¬ifier->done);
+ dev_dbg(notifier_dev(notifier), "v4l2-async: %s bound (ret %d)\n",
+ dev_name(sd->dev), ret);
+
/*
* See if the sub-device has a notifier. If not, return here.
*/
@@ -378,6 +429,8 @@ v4l2_async_nf_try_all_subdevs(struct v4l2_async_notifier *notifier)
if (!v4l2_dev)
return 0;
+ dev_dbg(notifier_dev(notifier), "v4l2-async: trying all sub-devices\n");
+
again:
list_for_each_entry(sd, &subdev_list, async_list) {
struct v4l2_async_subdev *asd;
@@ -387,6 +440,9 @@ v4l2_async_nf_try_all_subdevs(struct v4l2_async_notifier *notifier)
if (!asd)
continue;
+ dev_dbg(notifier_dev(notifier),
+ "v4l2-async: match found, subdev %s\n", sd->name);
+
ret = v4l2_async_match_notify(notifier, v4l2_dev, sd, asd);
if (ret < 0)
return ret;
@@ -496,8 +552,7 @@ static int v4l2_async_nf_asd_valid(struct v4l2_async_notifier *notifier,
struct v4l2_async_subdev *asd,
int this_index)
{
- struct device *dev =
- notifier->v4l2_dev ? notifier->v4l2_dev->dev : NULL;
+ struct device *dev = notifier_dev(notifier);
if (!asd)
return -EINVAL;
@@ -506,12 +561,12 @@ static int v4l2_async_nf_asd_valid(struct v4l2_async_notifier *notifier,
case V4L2_ASYNC_MATCH_I2C:
case V4L2_ASYNC_MATCH_FWNODE:
if (v4l2_async_nf_has_async_subdev(notifier, asd, this_index)) {
- dev_dbg(dev, "subdev descriptor already listed in this or other notifiers\n");
+ dev_dbg(dev, "v4l2-async: subdev descriptor already listed in a notifier\n");
return -EEXIST;
}
break;
default:
- dev_err(dev, "Invalid match type %u on %p\n",
+ dev_err(dev, "v4l2-async: Invalid match type %u on %p\n",
asd->match_type, asd);
return -EINVAL;
}
--
2.30.2
