linux-kernel - Re: [PATCH] thunderbolt: Remove the TBT3 Not Supported bit

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Message-ID: <20250203084651.GF3713119@black.fi.intel.com>
Date: Mon, 3 Feb 2025 10:46:51 +0200
From: Mika Westerberg <mika.westerberg@...ux.intel.com>
To: Mohammad Rahimi <rahimi.mhmmd@...il.com>
Cc: andreas.noever@...il.com, michael.jamet@...el.com,
	YehezkelShB@...il.com, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] thunderbolt: Remove the TBT3 Not Supported bit

Hi,

On Mon, Feb 03, 2025 at 01:17:47AM +0000, Mohammad Rahimi wrote:
> Since USB4 v2 specification has removed the mandatory requirement to
> support TBT3 on a USB4 Dock UFP, the TBT3 Not Supported bit is not
> usable, as when it needs to be read there is no USB4 Link.
> 
> This change was introduced in a "USB4 2.0 ENGINEERING CHANGE NOTICE
> FORM" published in September 2024, titled "TBT3 Support on USB4 Dock
> UFP".

I think the USB4 v1 hardware still has this bit and since it is just
debugging there is no harm keeping it around.