en Copyright 2015 Java http://172.16.0.5:8080/history/linux-6.15/Documentation/ABI/testing/sysfs-driver-typec-displayport#001b0c78 usb: typec: altmodes/displayport: Add hpd sysfs attributeExporsing HotPlugDetect(HPD) helps userspace to infer HPDstate as defined by VESA DisplayPort Alt Mode on USB Type-C Standard.This allows userspace to notify users for self help, for instance,to hint user that the display port cable is probably detached (or)the display port sink (viz., monitors ect.,) is un-powered.Also helps to debug issues reported from field.This change adds an additional attribute "hpd" to the existing"displayport" attributes.VESA DisplayPort Alt Mode on USB Type-C Standard defines howHotPlugDetect(HPD) shall be supported on the USB-C connectorwhen operating in DisplayPort Alt Mode. This is a read onlynode which reflects the current state of HPD.Valid values: - 1 when HPD’s logical state is high (HPD_High) - 0 when HPD’s logical state is low (HPD_Low)Signed-off-by: Badhri Jagan Sridharan <badhri@google.com>Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>Link: https://lore.kernel.org/r/20221211193755.1392128-1-badhri@google.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> List of files: /linux-6.15/Documentation/ABI/testing/sysfs-driver-typec-displayport Sun, 11 Dec 2022 19:37:55 +0000 Badhri Jagan Sridharan <badhri@google.com> http://172.16.0.5:8080/history/linux-6.15/Documentation/ABI/testing/sysfs-driver-typec-displayport#0e3bb7d6 usb: typec: Add driver for DisplayPort alternate modeDisplayPort USB Type-C Alt Mode allows DisplayPort displaysand adapters to be attached to the USB Type-C ports on thesystem.Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>Tested-by: Hans de Goede <hdegoede@redhat.com>Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> List of files: /linux-6.15/Documentation/ABI/testing/sysfs-driver-typec-displayport Wed, 27 Jun 2018 15:19:51 +0000 Heikki Krogerus <heikki.krogerus@linux.intel.com>