linux-kernel - Re: [PATCH v2 4/9] thunderbolt: Add initial support for USB4

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Message-ID: <20191218143612.GB262880@kroah.com>
Date:   Wed, 18 Dec 2019 15:36:12 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Nicholas Johnson <nicholas.johnson-opensource@...look.com.au>
Cc:     Mika Westerberg <mika.westerberg@...ux.intel.com>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        Andreas Noever <andreas.noever@...il.com>,
        Michael Jamet <michael.jamet@...el.com>,
        Yehezkel Bernat <YehezkelShB@...il.com>,
        Rajmohan Mani <rajmohan.mani@...el.com>,
        Lukas Wunner <lukas@...ner.de>,
        Alan Stern <stern@...land.harvard.edu>,
        "Mario.Limonciello@...l.com" <Mario.Limonciello@...l.com>,
        Anthony Wong <anthony.wong@...onical.com>,
        Oliver Neukum <oneukum@...e.com>,
        Christian Kellner <ckellner@...hat.com>,
        "David S . Miller" <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 4/9] thunderbolt: Add initial support for USB4

On Wed, Dec 18, 2019 at 09:34:45AM +0000, Nicholas Johnson wrote:
> On Tue, Dec 17, 2019 at 03:33:40PM +0300, Mika Westerberg wrote:
> > USB4 is the public specification based on Thunderbolt 3 protocol. There
> > are some differences in register layouts and flows. In addition to PCIe
> > and DP tunneling, USB4 supports tunneling of USB 3.x. USB4 is also
> > backward compatible with Thunderbolt 3 (and older generations but the
> > spec only talks about 3rd generation). USB4 compliant devices can be
> > identified by checking USB4 version field in router configuration space.
> > 
> > This patch adds initial support for USB4 compliant hosts and devices
> > which enables following features provided by the existing functionality
> > in the driver:
> > 
> >   - PCIe tunneling
> >   - Display Port tunneling
> Nitpick: DisplayPort is a single word.

Please learn to trim replies, it was a pain to read this message :(