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What: /sys/bus/typec/devices/.../displayport/configuration Date: July 2018 Contact: Heikki Krogerus <heikki.krogerus@linux.intel.com> Description: Shows the current DisplayPort configuration for the connector. Valid values are USB, source and sink. Source means DisplayPort source, and sink means DisplayPort sink. All supported configurations are listed as space separated list with the active one wrapped in square brackets. Source example: USB [source] sink The configuration can be changed by writing to the file Note. USB configuration does not equal to Exit Mode. It is separate configuration defined in VESA DisplayPort Alt Mode on USB Type-C Standard. Functionally it equals to the situation where the mode has been exited (to exit the mode, see Documentation/ABI/testing/sysfs-bus-typec, and use file /sys/bus/typec/devices/.../active). What: /sys/bus/typec/devices/.../displayport/pin_assignment Date: July 2018 Contact: Heikki Krogerus <heikki.krogerus@linux.intel.com> Description: VESA DisplayPort Alt Mode on USB Type-C Standard defines six different pin assignments for USB Type-C connector that are labeled A, B, C, D, E, and F. The supported pin assignments are listed as space separated list with the active one wrapped in square brackets. Example: C [D] Pin assignment can be changed by writing to the file. It is possible to set pin assignment before configuration has been set, but the assignment will not be active before the connector is actually configured. Note. As of VESA DisplayPort Alt Mode on USB Type-C Standard version 1.0b, pin assignments A, B, and F are deprecated. Only pin assignment D can now carry simultaneously one channel of USB SuperSpeed protocol. From user perspective pin assignments C and E are equal, where all channels on the connector are used for carrying DisplayPort protocol (allowing higher resolutions). What: /sys/bus/typec/devices/.../displayport/hpd Date: Dec 2022 Contact: Badhri Jagan Sridharan <badhri@google.com> Description: VESA DisplayPort Alt Mode on USB Type-C Standard defines how HotPlugDetect(HPD) shall be supported on the USB-C connector when operating in DisplayPort Alt Mode. This is a read only node which reflects the current state of HPD. Valid values: - 1: when HPD’s logical state is high (HPD_High) as defined by VESA DisplayPort Alt Mode on USB Type-C Standard. - 0 when HPD’s logical state is low (HPD_Low) as defined by VESA DisplayPort Alt Mode on USB Type-C Standard. |