[PATCH v3 1/4] usb: typec: Use Thunderbolt 3 cable discover mode VDO in Enter_USB message

[Utkarsh Patel]

When Thunderbolt 3 cable is being used to create USB4 connection, use
Thunderbolt 3 discover mode VDO to fill details such as active cable plug
link training and cable rounded support.
With USB4 cables, these VDO members need not be filled.

Suggested-by: Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
Signed-off-by: Utkarsh Patel <utkarsh.h.patel@xxxxxxxxx>

--
Changes in v3:
- Changed the commit mesage to reflect why TBT3 VDO is being used.
- Added more details in the header file about the usage of TBT3 VDO.

Changes in v2:
- No change.
--
---
 include/linux/usb/typec.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/include/linux/usb/typec.h b/include/linux/usb/typec.h
index 6be558045942..25731ed863fa 100644
--- a/include/linux/usb/typec.h
+++ b/include/linux/usb/typec.h
@@ -75,6 +75,10 @@ enum typec_orientation {
 /*
  * struct enter_usb_data - Enter_USB Message details
  * @eudo: Enter_USB Data Object
+ * @tbt_cable_vdo: TBT3 Cable Discover Mode Response
+ * @tbt_cable_vdo needs to be filled with details of active cable plug link
+ * training and cable rounded support when thunderbolt 3 cable is being used to
+ * create USB4 connection. Do not fill this in case of USB4 cable.
  * @active_link_training: Active Cable Plug Link Training
  *
  * @active_link_training is a flag that should be set with uni-directional SBRX
@@ -83,6 +87,7 @@ enum typec_orientation {
  */
 struct enter_usb_data {
 	u32			eudo;
+	u32			tbt_cable_vdo;
 	unsigned char		active_link_training:1;
 };
 
-- 
2.17.1