Re: [RFC PATCHv2] usb: USB Type-C Connector Class

[Guenter Roeck]

On 06/01/2016 02:04 AM, Oliver Neukum wrote:
> On Wed, 2016-06-01 at 11:23 +0300, Heikki Krogerus wrote:
> > I think we can still add them later if they are still seen as
> > necessity later on, tough I seriously doubt it. It would not be
> > ideal, but adding an attribute should not really break anything,
> > right? Removing would.
>
> However, how do we learn that the other side has triggered a reset?

USB PD specification, section 6.8.2.2 (Modal Operation and Hard Reset):

A Hard Reset shall cause all Active Modes to be exited by both Port Partners
and any Cable Plugs (see Section 6.4.4.3.4).

Section 6.4.4.3.4 (Enter Mode Command):

The following events shall also cause the Port Partners and Cable Plug(s) to exit all Active Modes:
- A PD Hard Reset
- The Port Partners or Cable Plug(s) are Detached
- A Cable Reset (only exits the Cable Plugâs Active Modes)

The class code would not explicitly learn about the reset,
but it would be informed about the exited modes.

Guenter