linux-kernel - Re: [RFC PATCH 06/22] thunderbolt: Add support for lane bonding

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Message-ID: <20191003085300.GQ2819@lahna.fi.intel.com>
Date:   Thu, 3 Oct 2019 11:53:00 +0300
From:   Mika Westerberg <mika.westerberg@...ux.intel.com>
To:     Oliver Neukum <oneukum@...e.com>
Cc:     Anthony Wong <anthony.wong@...onical.com>,
        Mario.Limonciello@...l.com,
        Andreas Noever <andreas.noever@...il.com>,
        Yehezkel Bernat <YehezkelShB@...il.com>,
        Michael Jamet <michael.jamet@...el.com>,
        Rajmohan Mani <rajmohan.mani@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Nicholas Johnson <nicholas.johnson-opensource@...look.com.au>,
        Alan Stern <stern@...land.harvard.edu>,
        linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
        Lukas Wunner <lukas@...ner.de>
Subject: Re: [RFC PATCH 06/22] thunderbolt: Add support for lane bonding

On Thu, Oct 03, 2019 at 10:25:32AM +0200, Oliver Neukum wrote:
> Am Mittwoch, den 02.10.2019, 17:30 +0300 schrieb Mika Westerberg:
> > On Wed, Oct 02, 2019 at 04:21:06PM +0200, Oliver Neukum wrote:
> > > Am Dienstag, den 01.10.2019, 15:53 +0300 schrieb Mika Westerberg:
> > > > > 
> > > > > Are we only going to be allowed to "bond" two links together?  Or will
> > > > > we be doing more than 2 in the future?  If more, then we might want to
> > > > > think of a different way to specify these...
> > > > 
> > > > AFAICT only two lanes are available in USB4. This goes over USB type-C
> > > > using the two lanes there.
> > > > 
> > > > Of course I don't know if in future there will be USB4 1.1 or something
> > > > that adds more lanes so if you think there is a better way to specify
> > > > these, I'm happy to implement that instead :) 
> > > 
> > > If this ever can become asymmetric this interface is going to turn
> > > around and bite.
> > 
> > Don't think it can be asymmetric but I'm open to all ideas how to make
> > it more flexible :-)
> 
> Split the the attributes into link_speed_rx and link_speed_tx. For
> link_width likewise. We had the same issue with USB.

OK, thanks for the suggestion.