linux-kernel - Re: [RFC PATCHv3] usb: USB Type-C Connector Class

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Message-ID: <20160613074856.GA13291@kuha.fi.intel.com>
Date:	Mon, 13 Jun 2016 10:48:56 +0300
From:	Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To:	Oliver Neukum <oneukum@...e.com>
Cc:	Guenter Roeck <linux@...ck-us.net>,
	Felipe Balbi <felipe.balbi@...ux.intel.com>,
	Greg KH <gregkh@...uxfoundation.org>,
	Pavel Machek <pavel@....cz>, linux-kernel@...r.kernel.org,
	linux-usb@...r.kernel.org
Subject: Re: [RFC PATCHv3] usb: USB Type-C Connector Class

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