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Message-ID: <573FF752.2080204@roeck-us.net> Date: Fri, 20 May 2016 22:51:14 -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 05/20/2016 06:37 AM, Oliver Neukum wrote: > On Fri, 2016-05-20 at 14:24 +0300, Heikki Krogerus wrote: >> On Thu, May 19, 2016 at 04:47:17PM +0200, Oliver Neukum wrote: >>> >>> Please explain. How does that express DRP but prefered master? >> >> Sorry but I'm not sure what you mean here. If the port is capable of >> being used as dual role port (DRP in the supported_data_roles file), >> that is the only case where you can select the role with this file. So >> I would imagine that in your case you want to make the port act as >> DFP only, right? But if the port is capable of acting only as UFP, you >> are stuck with that role. > > How do I trigger that Try.SRC is to be used on a port? > This would be part of the USB PD protocol, ie probably outside the scope of the class code. In my implementation, I enable Try.SRC or Try.SNK based on the platform's preferred role. Guenter
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