TBT_CABLE_SPEED
dp_data.conf |= TBT_CABLE_SPEED(cable_tbt_vdo) << DP_CONF_SIGNALLING_SHIFT;
vdo |= TBT_ENTER_MODE_CABLE_SPEED(TBT_CABLE_SPEED(plug->vdo));
u8 cable_speed = TBT_CABLE_SPEED(data->cable_mode);