From: Hans de Goede Date: Tue, 17 Aug 2021 21:51:56 +0000 (+0200) Subject: drm/connector: Add drm_connector_find_by_fwnode() function (v3) X-Git-Tag: v6.6.17~3937^2~17^2~2357^2~3 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=3d3f7c1e68691574c1d87cd0f9f2348323bc0199;p=platform%2Fkernel%2Flinux-rpi.git drm/connector: Add drm_connector_find_by_fwnode() function (v3) 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 ) Tested-by: Heikki Krogerus Signed-off-by: Hans de Goede Reviewed-by: Lyude Paul Link: https://lore.kernel.org/r/20210817215201.795062-4-hdegoede@redhat.com --- diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c index 3ad359a216ff..7d72bcefa4d6 100644 --- a/drivers/gpu/drm/drm_connector.c +++ b/drivers/gpu/drm/drm_connector.c @@ -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 diff --git a/drivers/gpu/drm/drm_crtc_internal.h b/drivers/gpu/drm/drm_crtc_internal.h index edb772947cb4..63279e984342 100644 --- a/drivers/gpu/drm/drm_crtc_internal.h +++ b/drivers/gpu/drm/drm_crtc_internal.h @@ -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, diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h index 69dd488a2154..8132c48b56ae 100644 --- a/include/drm/drm_connector.h +++ b/include/drm/drm_connector.h @@ -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;