linux-kernel - Re: [RFC PATCH 17/22] thunderbolt: Add initial support for USB4

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Date:   Fri, 4 Oct 2019 18:16:21 +0300
From:   Mika Westerberg <mika.westerberg@...ux.intel.com>
To:     Christian Kellner <christian@...lner.me>
Cc:     Mario.Limonciello@...l.com, yehezkelshb@...il.com,
        linux-usb@...r.kernel.org, andreas.noever@...il.com,
        michael.jamet@...el.com, rajmohan.mani@...el.com,
        nicholas.johnson-opensource@...look.com.au, lukas@...ner.de,
        gregkh@...uxfoundation.org, stern@...land.harvard.edu,
        anthony.wong@...onical.com, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 17/22] thunderbolt: Add initial support for USB4

On Fri, Oct 04, 2019 at 05:02:37PM +0200, Christian Kellner wrote:
> Should work. What would the value be for Thunderbolt 3 (and before)? I
> guess '0' if I am looking at the right thing (bits 31:24 in
> ROUTER_CS_4)?

Yes, it would be 0x10 and below that depending on the generation.

> Is there any harm of also having the 'generation' exposed
> as well? I like the simplicity of the mapping from that value to
> Thunderbolt/USB4 standard version (e.g. I would show that in 'boltctl
> list'); 'hw_version' will need a bit more "interpreting".

If generation is the only thing you need, we can export that now and
forget hw_version :)