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

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Date:	Wed, 1 Jun 2016 06:34:10 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	Oliver Neukum <oneukum@...e.com>,
	Heikki Krogerus <heikki.krogerus@...ux.intel.com>
Cc:	Andy Shevchenko <andy.shevchenko@...il.com>,
	Rajaram R <rajaram.officemail@...il.com>,
	Felipe Balbi <felipe.balbi@...ux.intel.com>,
	Mathias Nyman <mathias.nyman@...ux.intel.com>,
	Greg KH <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: [RFC PATCHv2] usb: USB Type-C Connector Class

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 Plug’s Active Modes)

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

Guenter