From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
	id S965129AbcFMHtH (ORCPT <rfc822;w@1wt.eu>);
	Mon, 13 Jun 2016 03:49:07 -0400
Received: from mga01.intel.com ([192.55.52.88]:15677 "EHLO mga01.intel.com"
	rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP
	id S964939AbcFMHtD (ORCPT <rfc822;linux-kernel@vger.kernel.org>);
	Mon, 13 Jun 2016 03:49:03 -0400
X-ExtLoop1: 1
X-IronPort-AV: E=Sophos;i="5.26,466,1459839600"; 
   d="scan'208";a="826840722"
Date: Mon, 13 Jun 2016 10:48:56 +0300
From: Heikki Krogerus <heikki.krogerus@linux.intel.com>
To: Oliver Neukum <oneukum@suse.com>
Cc: Guenter Roeck <linux@roeck-us.net>,
        Felipe Balbi <felipe.balbi@linux.intel.com>,
        Greg KH <gregkh@linuxfoundation.org>, Pavel Machek <pavel@ucw.cz>,
        linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org
Subject: Re: [RFC PATCHv3] usb: USB Type-C Connector Class
Message-ID: <20160613074856.GA13291@kuha.fi.intel.com>
References: <1463661894-22820-1-git-send-email-heikki.krogerus@linux.intel.com>
 <1465569269-63856-1-git-send-email-heikki.krogerus@linux.intel.com>
 <1465628746.3339.3.camel@suse.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <1465628746.3339.3.camel@suse.com>
User-Agent: Mutt/1.6.1 (2016-04-27)
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

On Sat, Jun 11, 2016 at 09:05:46AM +0200, Oliver Neukum wrote:
> On Fri, 2016-06-10 at 17:34 +0300, Heikki Krogerus wrote:
> > +static ssize_t
> > +preferred_role_store(struct device *dev, struct device_attribute
> > *attr,
> > +                    const char *buf, size_t size)
> > +{
> > +       struct typec_port *port = to_typec_port(dev);
> > +       enum typec_role role;
> > +       int ret;
> > +
> > +       mutex_lock(&port->lock);
> > +
> > +       if (port->cap->type != TYPEC_PORT_DRP) {
> > +               dev_dbg(dev, "Try.SRC/SNK only supported with DRP
> > ports\n");
> > +               ret = -EOPNOTSUPP;
> > +               goto out;
> > +       }
> 
> I think Try.SNK with an UFP should fail differently from
> Try.SRC and vice versa.
> 
> And, even more importantly, this offeres no way to cancel
> a preference.

Well, no way that would actually work. I'll fix that.

Thanks,

-- 
heikki