This is a note to let you know that I've just added the patch titled
drm/connector: Add drm_connector_find_by_fwnode() function (v3)
to the 5.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-connector-add-drm_connector_find_by_fwnode-funct.patch
and it can be found in the queue-5.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit ee97bc5579307c3cea27ef572d6bcb93852547ed
Author: Hans de Goede <hdegoede@xxxxxxxxxx>
Date: Tue Aug 17 23:51:56 2021 +0200
drm/connector: Add drm_connector_find_by_fwnode() function (v3)
[ Upstream commit 3d3f7c1e68691574c1d87cd0f9f2348323bc0199 ]
Add a function to find a connector based on a fwnode.
This will be used by the new drm_connector_oob_hotplug_event()
function which is added by the next patch in this patch-set.
Changes in v2:
- Complete rewrite to use a global connector list in drm_connector.c
rather then using a class-dev-iter in drm_sysfs.c
Changes in v3:
- Add forward declaration for struct fwnode_handle to drm_crtc_internal.h
(fixes warning reported by kernel test robot <lkp@xxxxxxxxx>)
Tested-by: Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>
Reviewed-by: Lyude Paul <lyude@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20210817215201.795062-4-hdegoede@xxxxxxxxxx
Stable-dep-of: 89434b069e46 ("usb: typec: altmodes/displayport: Signal hpd low when exiting mode")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
index c08501a5620d5..fc06f73acd3c9 100644
--- a/drivers/gpu/drm/drm_connector.c
+++ b/drivers/gpu/drm/drm_connector.c
@@ -64,6 +64,14 @@
* support can instead use e.g. drm_helper_hpd_irq_event().
*/
+/*
+ * Global connector list for drm_connector_find_by_fwnode().
+ * Note drm_connector_[un]register() first take connector->lock and then
+ * take the connector_list_lock.
+ */
+static DEFINE_MUTEX(connector_list_lock);
+static LIST_HEAD(connector_list);
+
struct drm_conn_prop_enum_list {
int type;
const char *name;
@@ -265,6 +273,7 @@ int drm_connector_init(struct drm_device *dev,
goto out_put_type_id;
}
+ INIT_LIST_HEAD(&connector->global_connector_list_entry);
INIT_LIST_HEAD(&connector->probed_modes);
INIT_LIST_HEAD(&connector->modes);
mutex_init(&connector->mutex);
@@ -534,6 +543,9 @@ int drm_connector_register(struct drm_connector *connector)
/* Let userspace know we have a new connector */
drm_sysfs_hotplug_event(connector->dev);
+ mutex_lock(&connector_list_lock);
+ list_add_tail(&connector->global_connector_list_entry, &connector_list);
+ mutex_unlock(&connector_list_lock);
goto unlock;
err_debugfs:
@@ -562,6 +574,10 @@ void drm_connector_unregister(struct drm_connector *connector)
return;
}
+ mutex_lock(&connector_list_lock);
+ list_del_init(&connector->global_connector_list_entry);
+ mutex_unlock(&connector_list_lock);
+
if (connector->funcs->early_unregister)
connector->funcs->early_unregister(connector);
@@ -2464,6 +2480,40 @@ int drm_mode_getconnector(struct drm_device *dev, void *data,
return ret;
}
+/**
+ * drm_connector_find_by_fwnode - Find a connector based on the associated fwnode
+ * @fwnode: fwnode for which to find the matching drm_connector
+ *
+ * This functions looks up a drm_connector based on its associated fwnode. When
+ * a connector is found a reference to the connector is returned. The caller must
+ * call drm_connector_put() to release this reference when it is done with the
+ * connector.
+ *
+ * Returns: A reference to the found connector or an ERR_PTR().
+ */
+struct drm_connector *drm_connector_find_by_fwnode(struct fwnode_handle *fwnode)
+{
+ struct drm_connector *connector, *found = ERR_PTR(-ENODEV);
+
+ if (!fwnode)
+ return ERR_PTR(-ENODEV);
+
+ mutex_lock(&connector_list_lock);
+
+ list_for_each_entry(connector, &connector_list, global_connector_list_entry) {
+ if (connector->fwnode == fwnode ||
+ (connector->fwnode && connector->fwnode->secondary == fwnode)) {
+ drm_connector_get(connector);
+ found = connector;
+ break;
+ }
+ }
+
+ mutex_unlock(&connector_list_lock);
+
+ return found;
+}
+
/**
* DOC: Tile group
diff --git a/drivers/gpu/drm/drm_crtc_internal.h b/drivers/gpu/drm/drm_crtc_internal.h
index da96b2f64d7e4..c3577eaee4164 100644
--- a/drivers/gpu/drm/drm_crtc_internal.h
+++ b/drivers/gpu/drm/drm_crtc_internal.h
@@ -57,6 +57,7 @@ struct drm_property;
struct edid;
struct kref;
struct work_struct;
+struct fwnode_handle;
/* drm_crtc.c */
int drm_mode_crtc_set_obj_prop(struct drm_mode_object *obj,
@@ -182,6 +183,7 @@ int drm_connector_set_obj_prop(struct drm_mode_object *obj,
int drm_connector_create_standard_properties(struct drm_device *dev);
const char *drm_get_connector_force_name(enum drm_connector_force force);
void drm_connector_free_work_fn(struct work_struct *work);
+struct drm_connector *drm_connector_find_by_fwnode(struct fwnode_handle *fwnode);
/* IOCTL */
int drm_connector_property_set_ioctl(struct drm_device *dev,
diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
index ffad68f775cc6..d6c7554f1d405 100644
--- a/include/drm/drm_connector.h
+++ b/include/drm/drm_connector.h
@@ -1193,6 +1193,14 @@ struct drm_connector {
*/
struct list_head head;
+ /**
+ * @global_connector_list_entry:
+ *
+ * Connector entry in the global connector-list, used by
+ * drm_connector_find_by_fwnode().
+ */
+ struct list_head global_connector_list_entry;
+
/** @base: base KMS object */
struct drm_mode_object base;
