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Re: [PATCH] usb: typec: Defer checking of valid power role swap to low level drivers

From Oliver Neukum <oneukum@suse.com>
Newsgroups linux.kernel
Subject Re: [PATCH] usb: typec: Defer checking of valid power role swap to low level drivers
Date 2017-05-19 12:50 +0200
Message-ID <tINDP-VX-1@gated-at.bofh.it> (permalink)
References (1 earlier) <tI1IS-8F-5@gated-at.bofh.it> <tI3AZ-1j2-3@gated-at.bofh.it> <tIpLc-8ip-13@gated-at.bofh.it> <tIwWm-5mj-9@gated-at.bofh.it> <tIAQh-r6-5@gated-at.bofh.it>
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Am Donnerstag, den 18.05.2017, 14:08 -0700 schrieb Badhri Jagan
Sridharan:
> > Badhri, would that work for us ?
> 
> Yes Geunter that should work as well. Requesting non-pd role swap either through
> current_power_role or current_data_role is virtually the same.

Yes and that is the issue.
If you can do PD and swap power roles, power roles will be swapped
and data connection and driver assignments stay put. However without
PD drivers will be unbound. That means that user space must be made
aware that requesting a power role change will have side effects.

	Regards
		Oliver

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[PATCH] usb: typec: Defer checking of valid power role swap to low level drivers Badhri Jagan Sridharan <badhri@google.com> - 2017-05-17 09:40 +0200
  Re: [PATCH] usb: typec: Defer checking of valid power role swap to  low level drivers Oliver Neukum <oneukum@suse.com> - 2017-05-17 09:40 +0200
    Re: [PATCH] usb: typec: Defer checking of valid power role swap to  low level drivers Guenter Roeck <linux@roeck-us.net> - 2017-05-17 11:40 +0200
      Re: [PATCH] usb: typec: Defer checking of valid power role swap to  low level drivers Heikki Krogerus <heikki.krogerus@linux.intel.com> - 2017-05-17 14:40 +0200
        Re: [PATCH] usb: typec: Defer checking of valid power role swap to  low level drivers Guenter Roeck <linux@roeck-us.net> - 2017-05-17 15:10 +0200
          Re: [PATCH] usb: typec: Defer checking of valid power role swap to  low level drivers Heikki Krogerus <heikki.krogerus@linux.intel.com> - 2017-05-17 16:00 +0200
            Re: [PATCH] usb: typec: Defer checking of valid power role swap to  low level drivers Badhri Jagan Sridharan <badhri@google.com> - 2017-05-17 20:10 +0200
      Re: [PATCH] usb: typec: Defer checking of valid power role swap to  low level drivers Oliver Neukum <oneukum@suse.com> - 2017-05-18 11:20 +0200
        Re: [PATCH] usb: typec: Defer checking of valid power role swap to  low level drivers Guenter Roeck <linux@roeck-us.net> - 2017-05-18 19:00 +0200
          Re: [PATCH] usb: typec: Defer checking of valid power role swap to  low level drivers Badhri Jagan Sridharan <badhri@google.com> - 2017-05-18 23:10 +0200
            Re: [PATCH] usb: typec: Defer checking of valid power role swap to  low level drivers Badhri Jagan Sridharan <badhri@google.com> - 2017-05-18 23:20 +0200
            Re: [PATCH] usb: typec: Defer checking of valid power role swap to  low level drivers Heikki Krogerus <heikki.krogerus@linux.intel.com> - 2017-05-19 12:40 +0200
              Re: [PATCH] usb: typec: Defer checking of valid power role swap to  low level drivers Guenter Roeck <linux@roeck-us.net> - 2017-05-19 15:30 +0200
            Re: [PATCH] usb: typec: Defer checking of valid power role swap to  low level drivers Oliver Neukum <oneukum@suse.com> - 2017-05-19 12:50 +0200
  Re: [PATCH] usb: typec: Defer checking of valid power role swap to  low level drivers Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-05-17 10:10 +0200
    Re: [PATCH] usb: typec: Defer checking of valid power role swap to  low level drivers Guenter Roeck <linux@roeck-us.net> - 2017-05-17 11:50 +0200

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