linux-kernel - Re: [PATCH] fix 5.15 init regression for Intel Bluetooth

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Message-ID: <c26d4792-0efa-d661-faec-cb00c68132e0@molgen.mpg.de>
Date:   Tue, 28 Dec 2021 11:46:43 +0100
From:   Paul Menzel <pmenzel@...gen.mpg.de>
To:     Ortwin Glück <ortwin.glueck@...object.ch>
Cc:     linux-bluetooth@...r.kernel.org,
        Marcel Holtmann <marcel@...tmann.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        Luiz Augusto von Dentz <luiz.dentz@...il.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] fix 5.15 init regression for Intel Bluetooth

Dear Ortwin,


Am 27.12.21 um 11:26 schrieb Ortwin Glück:

> On all 5.15 kernels the Intel Bluetooth no longer works. All was fine in 
> 5.14.
> Apparently the quirk is needed for this device.
> 
> vanilla 5.15.5:
>     Bluetooth: hci0: Reading Intel version command failed (-110)
>     Bluetooth: hci0: command tx timeout
> 
> with patch:
>     Bluetooth: hci0: Legacy ROM 2.5 revision 1.0 build 3 week 17 2014
>     Bluetooth: hci0: Intel device is already patched. patch num: 32
> 
> Please apply to stable too.

This has been already reported in *[PATCH] Bluetooth: Apply initial 
command workaround for more Intel chips* [1].

As I replied there, on what device do you experience this, and how can 
it be reproduced?

I have a Dell Latitude E7250 with the Bluetooth device 0x0a2a, and 
everything works fine under Debian sid/unstable with Linux 5.15 up to 
5.16-rc6.

     Bus 002 Device 003: ID 8087:0a2a Intel Corp. Bluetooth wireless 
interface


Kind regards,

Paul


[1]: 
https://lore.kernel.org/linux-bluetooth/20211202162256.31837-1-tiwai@suse.de/