lkml.org 
[lkml]   [2016]   [Jun]   [23]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCHv3 1/2] usb: USB Type-C connector class
From
Date
Hi,

On 23/06/16 15:00, Heikki Krogerus wrote:
> Hi Oliver,
>
> On Thu, Jun 23, 2016 at 10:38:58AM +0200, Oliver Neukum wrote:
>> On Thu, 2016-06-23 at 11:23 +0300, Heikki Krogerus wrote:
>>> On Wed, Jun 22, 2016 at 06:44:18PM +0200, Oliver Neukum wrote:
>>
>>> No it's not. DRP means a port that can operate as _either_ Source
>>> (host) or Sink (device), but not at the same time..
>>
>> Yes, but it is unclear what you will be after a connection
>> and that's the point.
>
> Which is a fact that we can do nothing about. The role after
> connection with DRP ports will be dictated by the partner or selected
> randomly in case the partner is also DRP. We can prefer a role, but
> that in the end guarantees nothing. So if the role that we end up with
> after connection (seen in current_data_role) does not satisfy us, all
> we can do is try to swap it.
>
> I'm not sure what is your point here.

What if the application wants to know exactly what role the device is
operating in at the current moment?

We need to have 2 distinct parameters.

1) supported_modes : host, device, host or device
2) current_mode: host, device, disconnected

--
cheers,
-roger

\
 
 \ /
  Last update: 2016-06-23 14:41    [W:0.972 / U:0.264 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site