Re: [PATCH v2 5/8] usb: typec: Use Thunderbolt 3 cable discover mode VDO in Enter_USB message

Prashant Malani
2020-11-17T21:16:46Z

Hi Utkarsh,

On Fri, Nov 13, 2020 at 12:25:00PM -0800, Utkarsh Patel wrote:
> USB4 also uses same cable properties as Thunderbolt 3 so use Thunderbolt 3
> cable discover mode VDO to fill details such as active cable plug link
> training and cable rounded support.
>
> Suggested-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
> Signed-off-by: Utkarsh Patel <utkarsh.h.patel@intel.com>
>
> --
> Changes in v2:
> - No change.
> --
> ---
> include/linux/usb/typec.h | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/include/linux/usb/typec.h b/include/linux/usb/typec.h
> index 6be558045942..d91e09d9d91c 100644
> --- a/include/linux/usb/typec.h
> +++ b/include/linux/usb/typec.h
> @@ -75,6 +75,7 @@ enum typec_orientation {
> /*
> * struct enter_usb_data - Enter_USB Message details
> * @eudo: Enter_USB Data Object
> + * @tbt_cable_vdo: TBT3 Cable Discover Mode Response
> * @active_link_training: Active Cable Plug Link Training
> *
> * @active_link_training is a flag that should be set with uni-directional SBRX
> @@ -83,6 +84,7 @@ enum typec_orientation {
> */
> struct enter_usb_data {
> u32 eudo;
> + u32 tbt_cable_vdo;

Can we instead just include a field for the rounded cable support property
, similar to what was done for active_link_training? That way this gets decoupled
from whether a TBT VDO was present in the cable or not

> unsigned char active_link_training:1;
> };
>
> --
> 2.17.1
>

Best regards,

-Prashant