linux-kernel - Re: [PATCH 1/2] thunderbolt: Read DROM directly from NVM before trying bit banging

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Message-ID: <Y+yJEjLa9R1JGlIu@black.fi.intel.com>
Date:   Wed, 15 Feb 2023 09:26:10 +0200
From:   Mika Westerberg <mika.westerberg@...ux.intel.com>
To:     Mario Limonciello <mario.limonciello@....com>
Cc:     Andreas Noever <andreas.noever@...il.com>,
        Michael Jamet <michael.jamet@...el.com>,
        Yehezkel Bernat <YehezkelShB@...il.com>, Sanju.Mehta@....com,
        stable@...r.kernel.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] thunderbolt: Read DROM directly from NVM before
 trying bit banging

On Wed, Feb 15, 2023 at 08:24:39AM +0200, Mika Westerberg wrote:
> > I guess something else that might be less detrimental the loss of UUID
> > by reading DROM this way would be to only read DROM this way if any CRC
> > failed.
> 
> Actually we do read UUID for TBT3 devices from link controller registers
> (see tb_lc_read_uuid()) instead so I think perhaps we can limit the
> bitbanging just for older TBT devices with no LC or something like that?

Just make sure UUID stays the same so that users don't need to
re-authorize their devices.