This patchset adds support for Type-C PD altmodes drivers to query the port data role using typec_altmode_get_data_role which requires a new symbol typec_get_data_role. The UFP is not allowed to send the Enter Mode command, so Alt Mode drivers can use this check to prevent driver registration during the probe sequence. The DisplayPort Alt Mode driver queries for the port data role during the probe sequence and exits if the port is the UFP. If a data role swap were initiated, the driver would be unregistered anyways so it is not necessary to keep it alive. RD Babiera (2): usb: typec: class: add typec_get_data_role symbol usb: typec: altmodes/displayport: do not enter mode if port is the UFP drivers/usb/typec/altmodes/displayport.c | 4 +++- drivers/usb/typec/class.c | 13 +++++++++++++ include/linux/usb/typec.h | 1 + include/linux/usb/typec_altmode.h | 12 ++++++++++++ 4 files changed, 29 insertions(+), 1 deletion(-) base-commit: 956606bafb5fc6e5968aadcda86fc0037e1d7548 -- 2.51.0.261.g7ce5a0a67e-goog
