diff options
Diffstat (limited to 'include/drm/drm_modeset_helper_vtables.h')
| -rw-r--r-- | include/drm/drm_modeset_helper_vtables.h | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/include/drm/drm_modeset_helper_vtables.h b/include/drm/drm_modeset_helper_vtables.h index 091c42205667..7847babd893c 100644 --- a/include/drm/drm_modeset_helper_vtables.h +++ b/include/drm/drm_modeset_helper_vtables.h @@ -747,6 +747,10 @@ struct drm_connector_helper_funcs { * This callback is used by the probe helpers in e.g. * drm_helper_probe_single_connector_modes(). * + * To avoid races with concurrent connector state updates, the helper + * libraries always call this with the &drm_mode_config.connection_mutex + * held. Because of this it's safe to inspect &drm_connector->state. + * * RETURNS: * * The number of modes added by calling drm_mode_probed_add(). @@ -754,6 +758,34 @@ struct drm_connector_helper_funcs { int (*get_modes)(struct drm_connector *connector); /** + * @detect_ctx: + * + * Check to see if anything is attached to the connector. The parameter + * force is set to false whilst polling, true when checking the + * connector due to a user request. force can be used by the driver to + * avoid expensive, destructive operations during automated probing. + * + * This callback is optional, if not implemented the connector will be + * considered as always being attached. + * + * This is the atomic version of &drm_connector_funcs.detect. + * + * To avoid races against concurrent connector state updates, the + * helper libraries always call this with ctx set to a valid context, + * and &drm_mode_config.connection_mutex will always be locked with + * the ctx parameter set to this ctx. This allows taking additional + * locks as required. + * + * RETURNS: + * + * &drm_connector_status indicating the connector's status, + * or the error code returned by drm_modeset_lock(), -EDEADLK. + */ + int (*detect_ctx)(struct drm_connector *connector, + struct drm_modeset_acquire_ctx *ctx, + bool force); + + /** * @mode_valid: * * Callback to validate a mode for a connector, irrespective of the @@ -771,6 +803,10 @@ struct drm_connector_helper_funcs { * CRTC helpers will not call this function. Drivers therefore must * still fully validate any mode passed in in a modeset request. * + * To avoid races with concurrent connector state updates, the helper + * libraries always call this with the &drm_mode_config.connection_mutex + * held. Because of this it's safe to inspect &drm_connector->state. + * * RETURNS: * * Either &drm_mode_status.MODE_OK or one of the failure reasons in &enum |