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Re: [PATCH 2/3] usb: type-c: USB Type-C Connector System Software Interface

From Heikki Krogerus <heikki.krogerus@linux.intel.com>
Newsgroups linux.kernel
Subject Re: [PATCH 2/3] usb: type-c: USB Type-C Connector System Software Interface
Date 2016-02-18 11:50 +0100
Message-ID <r3ujM-4dh-7@gated-at.bofh.it> (permalink)
References (5 earlier) <r37Gz-55s-35@gated-at.bofh.it> <r38jf-5Bd-5@gated-at.bofh.it> <r3auM-73z-35@gated-at.bofh.it> <r3bh8-7Ch-3@gated-at.bofh.it> <r3sUF-3nt-5@gated-at.bofh.it>
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Hi Peter,

On Thu, Feb 18, 2016 at 05:07:04PM +0800, Peter Chen wrote:
> On Wed, Feb 17, 2016 at 04:28:16PM +0200, Heikki Krogerus wrote:
> > On Wed, Feb 17, 2016 at 03:36:46PM +0200, Felipe Balbi wrote:
> > > IIRC mode and role negotiation goes via CC pins using the power delivery
> > > protocol. If I misunderstand anything, let me know.
> > 
> > The data role swap with USB Type-C connectors is in no way tied to USB
> > Power Delivery. The USB Type-C spec defines that when USB PD is
> > available, DR_Swap USB PD function is used to swap the role, otherwise
> > emulated disconnect will do the trick.
> 
> I am interested in how you design role swap on the fly without USB PD.
> Do you follow the spec like USB OTG 3.0 RSP (Role Swap Protocol) or
> just echo the /sys to give up current role, and swap to another?

No OTG with USB Type-C. You echo the wanted role to the
/sys/class/type-C/usbcN/data_role.

This operation from userspace is the same regardless was USB PD
supported or not. The actual operations needed for the role swap are
of course platform specific, and the responsibility of the drivers
that register the ports with type-c class.


Thanks,

-- 
heikki

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[PATCH 0/3] usb: USB Type-C Class and driver for UCSI Heikki Krogerus <heikki.krogerus@linux.intel.com> - 2016-02-09 18:10 +0100
  [PATCH 2/3] usb: type-c: USB Type-C Connector System Software Interface Heikki Krogerus <heikki.krogerus@linux.intel.com> - 2016-02-09 18:10 +0100
    Re: [PATCH 2/3] usb: type-c: USB Type-C Connector System Software  Interface Greg KH <gregkh@linuxfoundation.org> - 2016-02-09 19:30 +0100
      Re: [PATCH 2/3] usb: type-c: USB Type-C Connector System Software  Interface Heikki Krogerus <heikki.krogerus@linux.intel.com> - 2016-02-10 11:40 +0100
        Re: [PATCH 2/3] usb: type-c: USB Type-C Connector System Software  Interface Greg KH <gregkh@linuxfoundation.org> - 2016-02-10 18:30 +0100
          Re: [PATCH 2/3] usb: type-c: USB Type-C Connector System Software  Interface Heikki Krogerus <heikki.krogerus@linux.intel.com> - 2016-02-11 15:10 +0100
            Re: [PATCH 2/3] usb: type-c: USB Type-C Connector System Software  Interface Oliver Neukum <oneukum@suse.com> - 2016-02-15 16:40 +0100
              Re: [PATCH 2/3] usb: type-c: USB Type-C Connector System Software  Interface Heikki Krogerus <heikki.krogerus@linux.intel.com> - 2016-02-16 10:30 +0100
                Re: [PATCH 2/3] usb: type-c: USB Type-C Connector System Software  Interface Oliver Neukum <oneukum@suse.com> - 2016-02-16 14:50 +0100
                Re: [PATCH 2/3] usb: type-c: USB Type-C Connector System Software  Interface Heikki Krogerus <heikki.krogerus@linux.intel.com> - 2016-02-17 09:00 +0100
                Re: [PATCH 2/3] usb: type-c: USB Type-C Connector System Software  Interface Oliver Neukum <oneukum@suse.com> - 2016-02-17 10:10 +0100
                Re: [PATCH 2/3] usb: type-c: USB Type-C Connector System Software Interface Felipe Balbi <balbif@gmail.com> - 2016-02-17 11:40 +0100
                Re: [PATCH 2/3] usb: type-c: USB Type-C Connector System Software  Interface Oliver Neukum <oneukum@suse.com> - 2016-02-17 11:40 +0100
                Re: [PATCH 2/3] usb: type-c: USB Type-C Connector System Software  Interface Heikki Krogerus <heikki.krogerus@linux.intel.com> - 2016-02-17 12:20 +0100
                Re: [PATCH 2/3] usb: type-c: USB Type-C Connector System Software Interface Felipe Balbi <balbi@kernel.org> - 2016-02-17 14:40 +0100
                Re: [PATCH 2/3] usb: type-c: USB Type-C Connector System Software  Interface Heikki Krogerus <heikki.krogerus@linux.intel.com> - 2016-02-17 15:30 +0100
                Re: [PATCH 2/3] usb: type-c: USB Type-C Connector System Software  Interface Peter Chen <hzpeterchen@gmail.com> - 2016-02-18 10:20 +0100
                Re: [PATCH 2/3] usb: type-c: USB Type-C Connector System Software  Interface Heikki Krogerus <heikki.krogerus@linux.intel.com> - 2016-02-18 11:50 +0100
                Re: [PATCH 2/3] usb: type-c: USB Type-C Connector System Software Interface Rajaram R <rajaram.officemail@gmail.com> - 2016-02-18 11:40 +0100
                Re: [PATCH 2/3] usb: type-c: USB Type-C Connector System Software  Interface Heikki Krogerus <heikki.krogerus@linux.intel.com> - 2016-02-18 11:50 +0100
                Re: [PATCH 2/3] usb: type-c: USB Type-C Connector System Software Interface Rajaram R <rajaram.officemail@gmail.com> - 2016-02-18 12:10 +0100
                Re: [PATCH 2/3] usb: type-c: USB Type-C Connector System Software Interface Felipe Balbi <balbi@kernel.org> - 2016-02-17 14:40 +0100
                Re: [PATCH 2/3] usb: type-c: USB Type-C Connector System Software  Interface Oliver Neukum <oneukum@suse.com> - 2016-02-17 15:00 +0100
                Re: [PATCH 2/3] usb: type-c: USB Type-C Connector System Software Interface Felipe Balbi <balbif@gmail.com> - 2016-02-18 08:10 +0100
                Re: [PATCH 2/3] usb: type-c: USB Type-C Connector System Software  Interface Oliver Neukum <oneukum@suse.com> - 2016-02-18 11:30 +0100
                Re: [PATCH 2/3] usb: type-c: USB Type-C Connector System Software Interface Felipe Balbi <balbif@gmail.com> - 2016-02-18 11:40 +0100
                Re: [PATCH 2/3] usb: type-c: USB Type-C Connector System Software  Interface Oliver Neukum <oneukum@suse.com> - 2016-02-18 11:50 +0100
        Re: [PATCH 2/3] usb: type-c: USB Type-C Connector System Software  Interface Peter Chen <hzpeterchen@gmail.com> - 2016-02-18 10:40 +0100
          Re: [PATCH 2/3] usb: type-c: USB Type-C Connector System Software  Interface Oliver Neukum <oneukum@suse.com> - 2016-02-18 10:50 +0100
    Re: [PATCH 2/3] usb: type-c: USB Type-C Connector System Software  Interface Oliver Neukum <oneukum@suse.com> - 2016-02-10 12:30 +0100
      Re: [PATCH 2/3] usb: type-c: USB Type-C Connector System Software  Interface Heikki Krogerus <heikki.krogerus@linux.intel.com> - 2016-02-10 13:10 +0100
    Re: [PATCH 2/3] usb: type-c: USB Type-C Connector System Software Interface Andy Shevchenko <andy.shevchenko@gmail.com> - 2016-02-10 13:00 +0100
      Re: [PATCH 2/3] usb: type-c: USB Type-C Connector System Software  Interface Oliver Neukum <oneukum@suse.com> - 2016-02-10 14:30 +0100
        Re: [PATCH 2/3] usb: type-c: USB Type-C Connector System Software Interface Andy Shevchenko <andy.shevchenko@gmail.com> - 2016-02-10 15:10 +0100
          Re: [PATCH 2/3] usb: type-c: USB Type-C Connector System Software Interface Bjørn Mork <bjorn@mork.no> - 2016-02-10 16:20 +0100
            Re: [PATCH 2/3] usb: type-c: USB Type-C Connector System Software Interface Andy Shevchenko <andy.shevchenko@gmail.com> - 2016-02-11 09:30 +0100
              Re: [PATCH 2/3] usb: type-c: USB Type-C Connector System Software Interface Bjørn Mork <bjorn@mork.no> - 2016-02-11 10:10 +0100
      Re: [PATCH 2/3] usb: type-c: USB Type-C Connector System Software  Interface Oliver Neukum <oneukum@suse.com> - 2016-02-10 15:20 +0100
        Re: [PATCH 2/3] usb: type-c: USB Type-C Connector System Software Interface Andy Shevchenko <andy.shevchenko@gmail.com> - 2016-02-10 15:30 +0100
          Re: [PATCH 2/3] usb: type-c: USB Type-C Connector System Software  Interface Oliver Neukum <oneukum@suse.de> - 2016-02-10 16:20 +0100
            Fwd: [PATCH 2/3] usb: type-c: USB Type-C Connector System Software Interface Andy Shevchenko <andy.shevchenko@gmail.com> - 2016-02-11 09:20 +0100
              Re: Fwd: [PATCH 2/3] usb: type-c: USB Type-C Connector System  Software Interface Heikki Krogerus <heikki.krogerus@linux.intel.com> - 2016-02-11 15:20 +0100
    Re: [PATCH 2/3] usb: type-c: USB Type-C Connector System Software  Interface Oliver Neukum <oneukum@suse.com> - 2016-02-10 14:10 +0100
      Re: [PATCH 2/3] usb: type-c: USB Type-C Connector System Software  Interface Heikki Krogerus <heikki.krogerus@linux.intel.com> - 2016-02-11 15:10 +0100
  [PATCH 3/3] usb: type-c: UCSI ACPI driver Heikki Krogerus <heikki.krogerus@linux.intel.com> - 2016-02-09 18:10 +0100
    Re: [PATCH 3/3] usb: type-c: UCSI ACPI driver Greg KH <gregkh@linuxfoundation.org> - 2016-02-09 19:30 +0100
      Re: [PATCH 3/3] usb: type-c: UCSI ACPI driver Heikki Krogerus <heikki.krogerus@linux.intel.com> - 2016-02-10 11:30 +0100
  Re: [PATCH 0/3] usb: USB Type-C Class and driver for UCSI Oliver Neukum <oneukum@suse.com> - 2016-02-17 20:00 +0100
    Re: [PATCH 0/3] usb: USB Type-C Class and driver for UCSI Heikki Krogerus <heikki.krogerus@linux.intel.com> - 2016-02-18 10:30 +0100
  Re: [PATCH 0/3] usb: USB Type-C Class and driver for UCSI Rajaram R <rajaram.officemail@gmail.com> - 2016-02-17 20:40 +0100
    Re: [PATCH 0/3] usb: USB Type-C Class and driver for UCSI Heikki Krogerus <heikki.krogerus@linux.intel.com> - 2016-02-18 12:10 +0100
      Re: [PATCH 0/3] usb: USB Type-C Class and driver for UCSI Oliver Neukum <oneukum@suse.com> - 2016-02-18 12:20 +0100

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