From 72ad49682dde3d9de5708b8699dc8e0b44962322 Mon Sep 17 00:00:00 2001 From: Hans de Goede Date: Tue, 17 Aug 2021 23:51:57 +0200 Subject: drm/connector: Add support for out-of-band hotplug notification (v3) Add a new drm_connector_oob_hotplug_event() function and oob_hotplug_event drm_connector_funcs member. On some hardware a hotplug event notification may come from outside the display driver / device. An example of this is some USB Type-C setups where the hardware muxes the DisplayPort data and aux-lines but does not pass the altmode HPD status bit to the GPU's DP HPD pin. In cases like this the new drm_connector_oob_hotplug_event() function can be used to report these out-of-band events. Changes in v2: - Make drm_connector_oob_hotplug_event() take a fwnode as argument and have it call drm_connector_find_by_fwnode() internally. This allows making drm_connector_find_by_fwnode() a drm-internal function and avoids code outside the drm subsystem potentially holding on the a drm_connector reference for a longer period. Changes in v3: - Drop the data argument to the drm_connector_oob_hotplug_event function since it is not used atm. This can be re-added later when a use for it actually arises. Tested-by: Heikki Krogerus Signed-off-by: Hans de Goede Reviewed-by: Lyude Paul Link: https://lore.kernel.org/r/20210817215201.795062-5-hdegoede@redhat.com --- include/drm/drm_connector.h | 9 +++++++++ 1 file changed, 9 insertions(+) (limited to 'include/drm/drm_connector.h') diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h index 8132c48b56ae..79fa34e5ccdb 100644 --- a/include/drm/drm_connector.h +++ b/include/drm/drm_connector.h @@ -1084,6 +1084,14 @@ struct drm_connector_funcs { */ void (*atomic_print_state)(struct drm_printer *p, const struct drm_connector_state *state); + + /** + * @oob_hotplug_event: + * + * This will get called when a hotplug-event for a drm-connector + * has been received from a source outside the display driver / device. + */ + void (*oob_hotplug_event)(struct drm_connector *connector); }; /** @@ -1666,6 +1674,7 @@ drm_connector_is_unregistered(struct drm_connector *connector) DRM_CONNECTOR_UNREGISTERED; } +void drm_connector_oob_hotplug_event(struct fwnode_handle *connector_fwnode); const char *drm_get_connector_type_name(unsigned int connector_type); const char *drm_get_connector_status_name(enum drm_connector_status status); const char *drm_get_subpixel_order_name(enum subpixel_order order); -- cgit