linux-kernel - Re: [PATCH] usb: typec: Defer checking of valid power role swap to low level drivers

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Message-ID: <1495006472.30577.6.camel@suse.com>
Date:   Wed, 17 May 2017 09:34:32 +0200
From:   Oliver Neukum <oneukum@...e.com>
To:     Badhri Jagan Sridharan <badhri@...gle.com>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Guenter Roeck <linux@...ck-us.net>,
        linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: [PATCH] usb: typec: Defer checking of valid power role swap to
 low level drivers

Am Mittwoch, den 17.05.2017, 00:32 -0700 schrieb Badhri Jagan
Sridharan:

Hi,

> "Two independent set of mechanisms are defined to allow a USB Type-C
> DRP to functionally swap power and data roles. When USB PD is
> supported, power and data role swapping is performed as a subsequent
> step following the initial connection process. For non-PD implementations,
> power/data role swapping can optionally be dealt with as part of the initial
> connection process."

Well, as I read it, without PD once a connection is established, you
are stuck with your role. So it seems to me that blocking a later
attempt to change it makes sense.

	Regards
		Oliver