From: Oliver Neukum <oneukum@suse.com>
To: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Cc: Greg KH <gregkh@linuxfoundation.org>,
Felipe Balbi <balbi@kernel.org>,
Mathias Nyman <mathias.nyman@linux.intel.com>,
linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org
Subject: Re: [PATCH 2/3] usb: type-c: USB Type-C Connector System Software Interface
Date: Mon, 15 Feb 2016 16:30:18 +0100 [thread overview]
Message-ID: <1455550218.22176.11.camel@suse.com> (raw)
In-Reply-To: <20160211135011.GA32213@kuha.fi.intel.com>
On Thu, 2016-02-11 at 15:50 +0200, Heikki Krogerus wrote:
> Because USB Type-C ports (DRP ones) will select the data role randomly
> when you connect (to an other DRP port). USB Type-C spec defines that
> you can "prefer" host mode, but when both ends prefer host mode, it's
> +-0.
That question has not been answered. It would be awkward for the OS
to find itself in the slave role, which it is ill equipped for. So
the data role should be switched before the new device is announced
to user space. How is that handled?
Regards
Oliver
next prev parent reply other threads:[~2016-02-15 15:32 UTC|newest]
Thread overview: 90+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-09 17:01 [PATCH 0/3] usb: USB Type-C Class and driver for UCSI Heikki Krogerus
2016-02-09 17:01 ` [PATCH 1/3] usb: USB Type-C Connector Class Heikki Krogerus
2016-02-09 18:20 ` Greg KH
2016-02-10 10:38 ` Heikki Krogerus
2016-02-10 17:26 ` Greg KH
2016-02-11 14:07 ` Heikki Krogerus
2016-02-10 10:49 ` Oliver Neukum
2016-02-10 11:05 ` Andy Shevchenko
2016-02-10 11:11 ` Heikki Krogerus
2016-02-10 11:14 ` Andy Shevchenko
2016-02-10 11:23 ` Heikki Krogerus
2016-02-15 15:16 ` Oliver Neukum
2016-02-11 8:55 ` Felipe Balbi
2016-02-11 9:08 ` Oliver Neukum
2016-02-11 14:51 ` Heikki Krogerus
2016-02-11 14:36 ` Heikki Krogerus
2016-02-11 14:56 ` Oliver Neukum
2016-02-17 14:07 ` Oliver Neukum
2016-02-18 8:47 ` Heikki Krogerus
2016-02-18 9:21 ` Oliver Neukum
2016-02-18 13:09 ` Heikki Krogerus
2016-02-18 9:35 ` Oliver Neukum
2016-02-18 13:25 ` Heikki Krogerus
2016-02-18 13:44 ` Oliver Neukum
2016-02-18 15:13 ` Heikki Krogerus
2016-02-26 13:09 ` Heikki Krogerus
2016-02-09 17:01 ` [PATCH 2/3] usb: type-c: USB Type-C Connector System Software Interface Heikki Krogerus
2016-02-09 18:21 ` Greg KH
2016-02-10 10:30 ` Heikki Krogerus
2016-02-10 17:20 ` Greg KH
2016-02-11 13:50 ` Heikki Krogerus
2016-02-15 15:30 ` Oliver Neukum [this message]
2016-02-16 9:22 ` Heikki Krogerus
2016-02-16 13:39 ` Oliver Neukum
2016-02-17 7:58 ` Heikki Krogerus
2016-02-17 9:03 ` Oliver Neukum
2016-02-17 10:29 ` Felipe Balbi
2016-02-17 10:36 ` Oliver Neukum
2016-02-17 11:11 ` Heikki Krogerus
2016-02-17 13:36 ` Felipe Balbi
2016-02-17 14:28 ` Heikki Krogerus
2016-02-18 9:07 ` Peter Chen
2016-02-18 10:44 ` Heikki Krogerus
2016-02-18 10:37 ` Rajaram R
2016-02-18 10:47 ` Heikki Krogerus
2016-02-18 11:06 ` Rajaram R
2016-02-17 13:34 ` Felipe Balbi
2016-02-17 13:51 ` Oliver Neukum
2016-02-18 7:08 ` Felipe Balbi
2016-02-18 10:18 ` Oliver Neukum
2016-02-18 10:30 ` Felipe Balbi
2016-02-18 10:40 ` Oliver Neukum
2016-02-18 9:29 ` Peter Chen
2016-02-18 9:44 ` Oliver Neukum
2016-02-10 11:19 ` Oliver Neukum
2016-02-10 12:04 ` Heikki Krogerus
2016-02-10 11:56 ` Andy Shevchenko
2016-02-10 13:21 ` Oliver Neukum
2016-02-10 14:02 ` Andy Shevchenko
2016-02-10 15:11 ` Bjørn Mork
2016-02-11 8:26 ` Andy Shevchenko
2016-02-11 8:59 ` Bjørn Mork
2016-02-10 14:15 ` Oliver Neukum
2016-02-10 14:24 ` Andy Shevchenko
2016-02-10 15:08 ` Oliver Neukum
[not found] ` <CAHp75VfmGsskf7Cmni3b4=tCbkPsR8d3jPYiv93Lm6DM9gq1-g@mail.gmail.com>
2016-02-11 8:13 ` Fwd: " Andy Shevchenko
2016-02-11 14:10 ` Heikki Krogerus
2016-02-10 13:04 ` Oliver Neukum
2016-02-11 14:08 ` Heikki Krogerus
2016-02-09 17:01 ` [PATCH 3/3] usb: type-c: UCSI ACPI driver Heikki Krogerus
2016-02-09 18:22 ` Greg KH
2016-02-10 10:23 ` Heikki Krogerus
2016-02-17 18:53 ` [PATCH 0/3] usb: USB Type-C Class and driver for UCSI Oliver Neukum
2016-02-18 9:21 ` Heikki Krogerus
2016-02-17 19:34 ` Rajaram R
2016-02-18 11:05 ` Heikki Krogerus
2016-02-18 11:15 ` Oliver Neukum
2016-05-05 3:05 ` Guenter Roeck
2016-05-06 6:50 ` Felipe Balbi
2016-05-06 8:05 ` Guenter Roeck
2016-05-06 8:29 ` Heikki Krogerus
2016-05-06 14:10 ` Guenter Roeck
2016-05-06 8:23 ` Heikki Krogerus
2016-05-06 8:08 ` Heikki Krogerus
2016-05-06 14:08 ` Guenter Roeck
2016-05-11 3:14 ` Guenter Roeck
2016-05-11 9:40 ` Heikki Krogerus
2016-05-11 14:47 ` Guenter Roeck
2016-05-13 14:23 ` Heikki Krogerus
2016-05-13 17:48 ` Guenter Roeck
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