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drm/connector: Add drm_connector_find_by_fwnode() function (v3)

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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@intel.com>)

Tested-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Link: https://lore.kernel.org/r/20210817215201.795062-4-hdegoede@redhat.com
This commit is contained in:
Hans de Goede 2021-08-17 23:51:56 +02:00
parent 48c429c6d1
commit 3d3f7c1e68
3 changed files with 60 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

50
drivers/gpu/drm/drm_connector.c
View File

@ -65,6 +65,14 @@
* 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;
@ -267,6 +275,7 @@ 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);
@ -2545,6 +2561,40 @@ out:
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

2
drivers/gpu/drm/drm_crtc_internal.h
View File

@ -58,6 +58,7 @@ 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,
@ -186,6 +187,7 @@ 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,

8
include/drm/drm_connector.h
View File

@ -1247,6 +1247,14 @@ 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;