When the v4l2-async framework was introduced, the use case for it was to
connect a camera sensor with a parallel receiver. Both tended to be rather
simple devices with a single connection between them.
The framework has been since improved in multiple ways but there are
limitations that have remained, for instance the assumption an async
sub-device is connected towards a single notifier and via a single link
only.
This patch enables connecting a sub-device to one or more notifiers
simultaneously, with one or more connections per notifier. The notifier
information is moved from the sub-device to the connection and the
connections in sub-device are no longer a pointer but a linked list.
Signed-off-by: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>
Tested-by: Philipp Zabel <p.zabel@xxxxxxxxxxxxxx> # imx6qp
Tested_by: Niklas Söderlund <niklas.soderlund@xxxxxxxxxxxx> # rcar + adv746x
Tested-by: Aishwarya Kothari <aishwarya.kothari@xxxxxxxxxxx> # Apalis i.MX6Q with TC358743
---
drivers/media/v4l2-core/v4l2-async.c | 149 ++++++++++++++-------------
include/media/v4l2-async.h | 17 +--
include/media/v4l2-subdev.h | 7 +-
3 files changed, 90 insertions(+), 83 deletions(-)
diff --git a/drivers/media/v4l2-core/v4l2-async.c b/drivers/media/v4l2-core/v4l2-async.c
index cb962b0fc2bc9..6bd3e179f29f7 100644
--- a/drivers/media/v4l2-core/v4l2-async.c
+++ b/drivers/media/v4l2-core/v4l2-async.c
@@ -313,29 +313,43 @@ static int v4l2_async_match_notify(struct v4l2_async_notifier *notifier,
struct v4l2_async_connection *asc)
{
struct v4l2_async_notifier *subdev_notifier;
+ bool registered = false;
int ret;
- ret = v4l2_device_register_subdev(v4l2_dev, sd);
- if (ret < 0)
- return ret;
+ if (list_empty(&sd->asc_list)) {
+ ret = v4l2_device_register_subdev(v4l2_dev, sd);
+ if (ret < 0)
+ return ret;
+ registered = true;
+ }
ret = v4l2_async_nf_call_bound(notifier, sd, asc);
- if (ret < 0)
+ if (ret < 0) {
+ if (asc->match.type == V4L2_ASYNC_MATCH_TYPE_FWNODE)
+ dev_dbg(notifier_dev(notifier),
+ "failed binding %pfw (%d)\n",
+ asc->match.fwnode, ret);
goto err_unregister_subdev;
+ }
- /*
- * Depending of the function of the entities involved, we may want to
- * create links between them (for example between a sensor and its lens
- * or between a sensor's source pad and the connected device's sink
- * pad).
- */
- ret = v4l2_async_create_ancillary_links(notifier, sd);
- if (ret)
- goto err_call_unbind;
-
- sd->asd = asc;
- sd->notifier = notifier;
+ if (registered) {
+ /*
+ * Depending of the function of the entities involved, we may
+ * want to create links between them (for example between a
+ * sensor and its lens or between a sensor's source pad and the
+ * connected device's sink pad).
+ */
+ ret = v4l2_async_create_ancillary_links(notifier, sd);
+ if (ret) {
+ if (asc->match.type == V4L2_ASYNC_MATCH_TYPE_FWNODE)
+ dev_dbg(notifier_dev(notifier),
+ "failed creating links for %pfw (%d)\n",
+ asc->match.fwnode, ret);
+ goto err_call_unbind;
+ }
+ }
+ list_add(&asc->asc_subdev_entry, &sd->asc_list);
asc->sd = sd;
/* Move from the waiting list to notifier's done */
@@ -362,9 +376,11 @@ static int v4l2_async_match_notify(struct v4l2_async_notifier *notifier,
err_call_unbind:
v4l2_async_nf_call_unbind(notifier, sd, asc);
+ list_del(&asc->asc_subdev_entry);
err_unregister_subdev:
- v4l2_device_unregister_subdev(sd);
+ if (registered)
+ v4l2_device_unregister_subdev(sd);
return ret;
}
@@ -410,15 +426,16 @@ v4l2_async_nf_try_all_subdevs(struct v4l2_async_notifier *notifier)
return 0;
}
-static void v4l2_async_cleanup(struct v4l2_subdev *sd)
+static void v4l2_async_unbind_subdev_one(struct v4l2_async_notifier *notifier,
+ struct v4l2_async_connection *asc)
{
- v4l2_device_unregister_subdev(sd);
- /*
- * Subdevice driver will reprobe and put the subdev back
- * onto the list
- */
- list_del_init(&sd->async_list);
- sd->asd = NULL;
+ list_move_tail(&asc->asc_entry, ¬ifier->waiting_list);
+ if (list_is_singular(&asc->asc_subdev_entry)) {
+ v4l2_async_nf_call_unbind(notifier, asc->sd, asc);
+ v4l2_device_unregister_subdev(asc->sd);
+ asc->sd = NULL;
+ }
+ list_del(&asc->asc_subdev_entry);
}
/* Unbind all sub-devices in the notifier tree. */
@@ -435,11 +452,7 @@ v4l2_async_nf_unbind_all_subdevs(struct v4l2_async_notifier *notifier)
if (subdev_notifier)
v4l2_async_nf_unbind_all_subdevs(subdev_notifier);
- v4l2_async_nf_call_unbind(notifier, asc->sd, asc);
- v4l2_async_cleanup(asc->sd);
- list_move_tail(&asc->asc_entry, ¬ifier->waiting_list);
- list_move(&asc->sd->async_list, &subdev_list);
- asc->sd = NULL;
+ v4l2_async_unbind_subdev_one(notifier, asc);
}
notifier->parent = NULL;
@@ -456,13 +469,9 @@ v4l2_async_nf_has_async_match_entry(struct v4l2_async_notifier *notifier,
if (v4l2_async_match_equal(&asc->match, match))
return true;
- list_for_each_entry(asc, ¬ifier->done_list, asc_entry) {
- if (WARN_ON(!asc->sd->asd))
- continue;
-
+ list_for_each_entry(asc, ¬ifier->done_list, asc_entry)
if (v4l2_async_match_equal(&asc->match, match))
return true;
- }
return false;
}
@@ -642,16 +651,12 @@ static void __v4l2_async_nf_cleanup(struct v4l2_async_notifier *notifier)
WARN_ON(!list_empty(¬ifier->done_list));
list_for_each_entry_safe(asc, tmp, ¬ifier->waiting_list, asc_entry) {
- switch (asc->match.type) {
- case V4L2_ASYNC_MATCH_TYPE_FWNODE:
- fwnode_handle_put(asc->match.fwnode);
- break;
- default:
- break;
- }
-
list_del(&asc->asc_entry);
v4l2_async_nf_call_destroy(notifier, asc);
+
+ if (asc->match.type == V4L2_ASYNC_MATCH_TYPE_FWNODE)
+ fwnode_handle_put(asc->match.fwnode);
+
kfree(asc);
}
}
@@ -666,16 +671,14 @@ void v4l2_async_nf_cleanup(struct v4l2_async_notifier *notifier)
}
EXPORT_SYMBOL_GPL(v4l2_async_nf_cleanup);
-static int __v4l2_async_nf_add_connection(struct v4l2_async_notifier *notifier,
- struct v4l2_async_connection *asc)
+static void __v4l2_async_nf_add_connection(struct v4l2_async_notifier *notifier,
+ struct v4l2_async_connection *asc)
{
mutex_lock(&list_lock);
list_add_tail(&asc->asc_entry, ¬ifier->waiting_list);
mutex_unlock(&list_lock);
-
- return 0;
}
struct v4l2_async_connection *
@@ -684,21 +687,16 @@ __v4l2_async_nf_add_fwnode(struct v4l2_async_notifier *notifier,
unsigned int asc_struct_size)
{
struct v4l2_async_connection *asc;
- int ret;
asc = kzalloc(asc_struct_size, GFP_KERNEL);
if (!asc)
return ERR_PTR(-ENOMEM);
+ asc->notifier = notifier;
asc->match.type = V4L2_ASYNC_MATCH_TYPE_FWNODE;
asc->match.fwnode = fwnode_handle_get(fwnode);
- ret = __v4l2_async_nf_add_connection(notifier, asc);
- if (ret) {
- fwnode_handle_put(fwnode);
- kfree(asc);
- return ERR_PTR(ret);
- }
+ __v4l2_async_nf_add_connection(notifier, asc);
return asc;
}
@@ -731,21 +729,17 @@ __v4l2_async_nf_add_i2c(struct v4l2_async_notifier *notifier, int adapter_id,
unsigned short address, unsigned int asc_struct_size)
{
struct v4l2_async_connection *asc;
- int ret;
asc = kzalloc(asc_struct_size, GFP_KERNEL);
if (!asc)
return ERR_PTR(-ENOMEM);
+ asc->notifier = notifier;
asc->match.type = V4L2_ASYNC_MATCH_TYPE_I2C;
asc->match.i2c.adapter_id = adapter_id;
asc->match.i2c.address = address;
- ret = __v4l2_async_nf_add_connection(notifier, asc);
- if (ret) {
- kfree(asc);
- return ERR_PTR(ret);
- }
+ __v4l2_async_nf_add_connection(notifier, asc);
return asc;
}
@@ -754,7 +748,11 @@ EXPORT_SYMBOL_GPL(__v4l2_async_nf_add_i2c);
struct v4l2_async_connection *
v4l2_async_connection_unique(struct v4l2_subdev *sd)
{
- return sd->asd;
+ if (!list_is_singular(&sd->asc_list))
+ return NULL;
+
+ return list_first_entry(&sd->asc_list,
+ struct v4l2_async_connection, asc_subdev_entry);
}
EXPORT_SYMBOL_GPL(v4l2_async_connection_unique);
@@ -762,8 +760,11 @@ int v4l2_async_register_subdev(struct v4l2_subdev *sd)
{
struct v4l2_async_notifier *subdev_notifier;
struct v4l2_async_notifier *notifier;
+ struct v4l2_async_connection *asc;
int ret;
+ INIT_LIST_HEAD(&sd->asc_list);
+
/*
* No reference taken. The reference is held by the device (struct
* v4l2_subdev.dev), and async sub-device does not exist independently
@@ -786,7 +787,6 @@ int v4l2_async_register_subdev(struct v4l2_subdev *sd)
list_for_each_entry(notifier, ¬ifier_list, notifier_entry) {
struct v4l2_device *v4l2_dev =
v4l2_async_nf_find_v4l2_dev(notifier);
- struct v4l2_async_connection *asc;
if (!v4l2_dev)
continue;
@@ -823,11 +823,8 @@ int v4l2_async_register_subdev(struct v4l2_subdev *sd)
if (subdev_notifier)
v4l2_async_nf_unbind_all_subdevs(subdev_notifier);
- if (sd->asd) {
- v4l2_async_nf_call_unbind(notifier, sd, sd->asd);
- sd->asd->sd = NULL;
- }
- v4l2_async_cleanup(sd);
+ if (asc)
+ v4l2_async_unbind_subdev_one(notifier, asc);
mutex_unlock(&list_lock);
@@ -837,6 +834,8 @@ EXPORT_SYMBOL(v4l2_async_register_subdev);
void v4l2_async_unregister_subdev(struct v4l2_subdev *sd)
{
+ struct v4l2_async_connection *asc, *asc_tmp;
+
if (!sd->async_list.next)
return;
@@ -849,15 +848,19 @@ void v4l2_async_unregister_subdev(struct v4l2_subdev *sd)
kfree(sd->subdev_notifier);
sd->subdev_notifier = NULL;
- if (sd->asd) {
- struct v4l2_async_notifier *notifier = sd->notifier;
+ if (sd->asc_list.next) {
+ list_for_each_entry_safe(asc, asc_tmp, &sd->asc_list,
+ asc_subdev_entry) {
+ list_move(&asc->asc_entry,
+ &asc->notifier->waiting_list);
- list_move(&sd->asd->asc_entry, ¬ifier->waiting_list);
- v4l2_async_nf_call_unbind(notifier, sd, sd->asd);
- sd->asd->sd = NULL;
+ v4l2_async_unbind_subdev_one(asc->notifier, asc);
+ list_del(&asc->asc_subdev_entry);
+ }
}
- v4l2_async_cleanup(sd);
+ list_del(&sd->async_list);
+ sd->async_list.next = NULL;
mutex_unlock(&list_lock);
}
diff --git a/include/media/v4l2-async.h b/include/media/v4l2-async.h
index 5bc2efe720c23..8670b8e448513 100644
--- a/include/media/v4l2-async.h
+++ b/include/media/v4l2-async.h
@@ -62,27 +62,32 @@ struct v4l2_async_match_desc {
};
/**
- * struct v4l2_async_connection - connection descriptor, as known to a bridge
+ * struct v4l2_async_connection - sub-device connection descriptor, as known to
+ * a bridge
*
* @match: struct of match type and per-bus type matching data sets
+ * @notifier: the async notifier the connection is related to
* @asc_entry: used to add struct v4l2_async_connection objects to the
* notifier @waiting_list or @done_list
+ * @asc_subdev_entry: entry in struct v4l2_async_subdev.asc_list list
* @sd: the related sub-device
*
- * When this struct is used as a member in a driver specific struct,
- * the driver specific struct shall contain the &struct
- * v4l2_async_connection as its first member.
+ * When this struct is used as a member in a driver specific struct, the driver
+ * specific struct shall contain the &struct v4l2_async_connection as its first
+ * member.
*/
struct v4l2_async_connection {
struct v4l2_async_match_desc match;
+ struct v4l2_async_notifier *notifier;
struct list_head asc_entry;
+ struct list_head asc_subdev_entry;
struct v4l2_subdev *sd;
};
/**
* struct v4l2_async_notifier_operations - Asynchronous V4L2 notifier operations
- * @bound: a subdevice driver has successfully probed one of the subdevices
- * @complete: All subdevices have been probed successfully. The complete
+ * @bound: a sub-device has been bound by the given connection
+ * @complete: All connections have been bound successfully. The complete
* callback is only executed for the root notifier.
* @unbind: a subdevice is leaving
* @destroy: the asc is about to be freed
diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h
index 212d7f1ac525c..a8078ae995966 100644
--- a/include/media/v4l2-subdev.h
+++ b/include/media/v4l2-subdev.h
@@ -1022,10 +1022,10 @@ struct v4l2_subdev_platform_data {
* either dev->of_node->fwnode or dev->fwnode (whichever is non-NULL).
* @async_list: Links this subdev to a global subdev_list or
* @notifier->done_list list.
- * @asd: Pointer to respective &struct v4l2_async_connection.
- * @notifier: Pointer to the managing notifier.
* @subdev_notifier: A sub-device notifier implicitly registered for the sub-
* device using v4l2_async_register_subdev_sensor().
+ * @asc_list: Async connection list, of &struct
+ * v4l2_async_connection.subdev_entry.
* @pdata: common part of subdevice platform data
* @state_lock: A pointer to a lock used for all the subdev's states, set by the
* driver. This is optional. If NULL, each state instance will get
@@ -1065,9 +1065,8 @@ struct v4l2_subdev {
struct device *dev;
struct fwnode_handle *fwnode;
struct list_head async_list;
- struct v4l2_async_connection *asd;
- struct v4l2_async_notifier *notifier;
struct v4l2_async_notifier *subdev_notifier;
+ struct list_head asc_list;
struct v4l2_subdev_platform_data *pdata;
struct mutex *state_lock;
--
2.39.2
