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Re: [RFC PATCHv2] usb: USB Type-C Connector Class

From Heikki Krogerus <heikki.krogerus@linux.intel.com>
Newsgroups linux.kernel
Subject Re: [RFC PATCHv2] usb: USB Type-C Connector Class
Date 2016-05-27 09:40 +0200
Message-ID <rDkxb-uS-1@gated-at.bofh.it> (permalink)
References <rAvyN-8iS-1@gated-at.bofh.it> <rCk6i-3mY-11@gated-at.bofh.it> <rCFaF-nq-7@gated-at.bofh.it> <rCIUW-2Ao-19@gated-at.bofh.it>
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On Wed, May 25, 2016 at 08:19:47AM -0700, Guenter Roeck wrote:
> On Wed, May 25, 2016 at 02:28:46PM +0300, Heikki Krogerus wrote:
> > Hi,
> > 
> > On Tue, May 24, 2016 at 02:51:40PM +0200, Oliver Neukum wrote:
> > > On Thu, 2016-05-19 at 15:44 +0300, Heikki Krogerus wrote:
> > > 
> > > Hi,
> > > 
> > > as this discussion seems to go in circles, I am starting anew
> > > at the top.
> > > 
> > > > Like I've told some of you guys, I'm trying to implement a bus for
> > > > the Alternate Modes, but I'm still nowhere near finished with that
> > > > one, so let's just get the class ready now. The altmode bus should in
> > > > any case not affect the userspace interface proposed in this patch.
> > > > 
> > > > As you can see, the Alternate Modes are handled completely differently
> > > > compared to the original proposal. Every Alternate Mode will have
> > > > their own device instance (which will be then later bound to an
> > > > Alternate Mode specific driver once we have the bus), but also every
> > > > partner, cable and cable plug will have their own device instances
> > > > representing them.
> > > 
> > > The API works for a DFP. I fail to see how the UFP learns about entering
> > > an alternate mode.
> > > Secondly, support to trigger a reset is missing
> > 
> > I'm fine with adding an attribute for port and cable resets if it's
> > something that is needed. So do you want to be able to execute hard
> > reset on a port?
> > 
> > But could you please explain the case(s) where you need to tricker a
> > reset.
> > 
> > > > An other change is that the data role is now handled in two ways.
> > > > The current_data_role file will represent static mode of the port, and
> > > > it will use the names for the roles as they are defined in the spec:
> > > > DFP, UFP and DRP. This file should be used if the port needs to be
> > > 
> > > Good, but support for Try.SRC and Try.SNK is missing.
> > 
> > OK, but what is Try.SNK? It's not in the specs?
> > 
> 
> It is not in the USB PD specification, but in "USB Type-C Specification
> Release 1.2 - Cable and Connector Specification".
> 
> Section 4.5.2.2.11, "Try.SNK State", says
> 
> "Note: if both Try.SRC and Try.SNK mechanisms are implemented, only one
>  shall be enabled by the port at any given time. Deciding which of these
>  two mechanisms is enabled is product design-specific."
> 
> ... which is why I suggested earlier that there should be a platform
> parameter to enable one or the other.

Heh, I'm still living the year 2015 :). I've missed the Type-C 1.2
spec.


Thanks guys,

-- 
heikki

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Thread

[RFC PATCHv2] usb: USB Type-C Connector Class Heikki Krogerus <heikki.krogerus@linux.intel.com> - 2016-05-19 14:50 +0200
  Re: [RFC PATCHv2] usb: USB Type-C Connector Class Oliver Neukum <oneukum@suse.com> - 2016-05-19 17:00 +0200
    Re: [RFC PATCHv2] usb: USB Type-C Connector Class Greg KH <gregkh@linuxfoundation.org> - 2016-05-19 17:50 +0200
      Re: [RFC PATCHv2] usb: USB Type-C Connector Class Heikki Krogerus <heikki.krogerus@linux.intel.com> - 2016-05-20 13:00 +0200
  Re: [RFC PATCHv2] usb: USB Type-C Connector Class Oliver Neukum <oneukum@suse.com> - 2016-05-19 17:00 +0200
    Re: [RFC PATCHv2] usb: USB Type-C Connector Class Heikki Krogerus <heikki.krogerus@linux.intel.com> - 2016-05-20 13:30 +0200
      Re: [RFC PATCHv2] usb: USB Type-C Connector Class Oliver Neukum <oneukum@suse.com> - 2016-05-20 15:50 +0200
        Re: [RFC PATCHv2] usb: USB Type-C Connector Class Guenter Roeck <linux@roeck-us.net> - 2016-05-21 08:00 +0200
          Re: [RFC PATCHv2] usb: USB Type-C Connector Class Oliver Neukum <oneukum@suse.com> - 2016-05-21 08:50 +0200
            Re: [RFC PATCHv2] usb: USB Type-C Connector Class Guenter Roeck <linux@roeck-us.net> - 2016-05-22 18:00 +0200
              Re: [RFC PATCHv2] usb: USB Type-C Connector Class Oliver Neukum <oneukum@suse.com> - 2016-05-23 07:40 +0200
                Re: [RFC PATCHv2] usb: USB Type-C Connector Class Guenter Roeck <linux@roeck-us.net> - 2016-05-23 15:30 +0200
                Re: [RFC PATCHv2] usb: USB Type-C Connector Class Oliver Neukum <oneukum@suse.com> - 2016-05-23 16:10 +0200
                Re: [RFC PATCHv2] usb: USB Type-C Connector Class Guenter Roeck <linux@roeck-us.net> - 2016-05-23 16:50 +0200
                Re: [RFC PATCHv2] usb: USB Type-C Connector Class Oliver Neukum <oneukum@suse.com> - 2016-05-23 18:00 +0200
                Re: [RFC PATCHv2] usb: USB Type-C Connector Class Guenter Roeck <linux@roeck-us.net> - 2016-05-23 19:00 +0200
                Re: [RFC PATCHv2] usb: USB Type-C Connector Class Heikki Krogerus <heikki.krogerus@linux.intel.com> - 2016-05-24 12:10 +0200
                Re: [RFC PATCHv2] usb: USB Type-C Connector Class Oliver Neukum <oneukum@suse.com> - 2016-05-24 12:30 +0200
                Re: [RFC PATCHv2] usb: USB Type-C Connector Class Heikki Krogerus <heikki.krogerus@linux.intel.com> - 2016-05-24 13:10 +0200
  Re: [RFC PATCHv2] usb: USB Type-C Connector Class Guenter Roeck <linux@roeck-us.net> - 2016-05-19 20:00 +0200
    Re: [RFC PATCHv2] usb: USB Type-C Connector Class Heikki Krogerus <heikki.krogerus@linux.intel.com> - 2016-05-20 12:50 +0200
      Re: [RFC PATCHv2] usb: USB Type-C Connector Class Guenter Roeck <linux@roeck-us.net> - 2016-05-20 19:10 +0200
        Re: [RFC PATCHv2] usb: USB Type-C Connector Class Heikki Krogerus <heikki.krogerus@linux.intel.com> - 2016-05-23 11:30 +0200
  Re: [RFC PATCHv2] usb: USB Type-C Connector Class Oliver Neukum <oneukum@suse.com> - 2016-05-20 16:30 +0200
    Re: [RFC PATCHv2] usb: USB Type-C Connector Class Heikki Krogerus <heikki.krogerus@linux.intel.com> - 2016-05-23 12:00 +0200
      Re: [RFC PATCHv2] usb: USB Type-C Connector Class Oliver Neukum <oneukum@suse.com> - 2016-05-23 13:30 +0200
        Re: [RFC PATCHv2] usb: USB Type-C Connector Class Guenter Roeck <linux@roeck-us.net> - 2016-05-23 19:10 +0200
          Re: [RFC PATCHv2] usb: USB Type-C Connector Class Oliver Neukum <oneukum@suse.com> - 2016-05-24 11:10 +0200
        Re: [RFC PATCHv2] usb: USB Type-C Connector Class Heikki Krogerus <heikki.krogerus@linux.intel.com> - 2016-05-24 11:40 +0200
  Re: [RFC PATCHv2] usb: USB Type-C Connector Class Oliver Neukum <oneukum@suse.com> - 2016-05-24 15:00 +0200
    Re: [RFC PATCHv2] usb: USB Type-C Connector Class Heikki Krogerus <heikki.krogerus@linux.intel.com> - 2016-05-25 13:30 +0200
      Re: [RFC PATCHv2] usb: USB Type-C Connector Class Guenter Roeck <linux@roeck-us.net> - 2016-05-25 17:30 +0200
        Re: [RFC PATCHv2] usb: USB Type-C Connector Class Heikki Krogerus <heikki.krogerus@linux.intel.com> - 2016-05-27 09:40 +0200
  Re: [RFC PATCHv2] usb: USB Type-C Connector Class Guenter Roeck <linux@roeck-us.net> - 2016-05-24 15:50 +0200
    Re: [RFC PATCHv2] usb: USB Type-C Connector Class Heikki Krogerus <heikki.krogerus@linux.intel.com> - 2016-05-25 13:40 +0200
      Re: [RFC PATCHv2] usb: USB Type-C Connector Class Guenter Roeck <linux@roeck-us.net> - 2016-05-25 15:20 +0200
  Re: [RFC PATCHv2] usb: USB Type-C Connector Class Guenter Roeck <linux@roeck-us.net> - 2016-05-24 21:30 +0200
    Re: [RFC PATCHv2] usb: USB Type-C Connector Class Heikki Krogerus <heikki.krogerus@linux.intel.com> - 2016-05-25 14:00 +0200
      Re: [RFC PATCHv2] usb: USB Type-C Connector Class Guenter Roeck <linux@roeck-us.net> - 2016-05-25 15:30 +0200
        Re: [RFC PATCHv2] usb: USB Type-C Connector Class Heikki Krogerus <heikki.krogerus@linux.intel.com> - 2016-05-25 16:10 +0200
          Re: [RFC PATCHv2] usb: USB Type-C Connector Class Oliver Neukum <oneukum@suse.com> - 2016-05-25 16:30 +0200
            Re: [RFC PATCHv2] usb: USB Type-C Connector Class Guenter Roeck <linux@roeck-us.net> - 2016-05-25 17:10 +0200
              Re: [RFC PATCHv2] usb: USB Type-C Connector Class Heikki Krogerus <heikki.krogerus@linux.intel.com> - 2016-05-27 09:30 +0200
  [RFC PATCH] usb: typec: Various API updates and fixes Guenter Roeck <linux@roeck-us.net> - 2016-05-25 20:40 +0200
    Re: [RFC PATCH] usb: typec: Various API updates and fixes Heikki Krogerus <heikki.krogerus@linux.intel.com> - 2016-05-27 10:00 +0200
      Re: [RFC PATCH] usb: typec: Various API updates and fixes Guenter Roeck <linux@roeck-us.net> - 2016-05-27 16:10 +0200
        Re: [RFC PATCH] usb: typec: Various API updates and fixes Heikki Krogerus <heikki.krogerus@linux.intel.com> - 2016-05-30 14:50 +0200
  Re: [RFC PATCHv2] usb: USB Type-C Connector Class Heikki Krogerus <heikki.krogerus@linux.intel.com> - 2016-05-30 15:30 +0200
    Re: [RFC PATCHv2] usb: USB Type-C Connector Class Oliver Neukum <oneukum@suse.com> - 2016-05-30 16:10 +0200
      Re: [RFC PATCHv2] usb: USB Type-C Connector Class Heikki Krogerus <heikki.krogerus@linux.intel.com> - 2016-05-31 10:40 +0200

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