linux-kernel - Re: [PATCH] Bluetooth: Apply initial command workaround for more Intel chips

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Date:   Sun, 16 Jan 2022 15:06:26 +0100
From:   Paul Menzel <pmenzel@...gen.mpg.de>
To:     Takashi Iwai <tiwai@...e.de>
Cc:     Fernando Ramos <greenfoo@....eu>,
        Johan Hedberg <johan.hedberg@...il.com>,
        Luiz Augusto von Dentz <luiz.dentz@...il.com>,
        Tedd Ho-Jeong An <tedd.an@...el.com>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-bluetooth@...r.kernel.org,
        Marcel Holtmann <marcel@...tmann.org>
Subject: Re: [PATCH] Bluetooth: Apply initial command workaround for more
 Intel chips


Dear Takashi,


Am 10.12.21 um 14:23 schrieb Takashi Iwai:
> On Tue, 07 Dec 2021 17:14:02 +0100, Marcel Holtmann wrote:

>>>> Thanks, so this seems depending on the hardware, maybe a subtle
>>>> difference matters.  As far as I read the code changes, the workaround
>>>> was applied in the past unconditionally, so it must be fairly safe
>>>> even if the chip works as is.
>>>>
>>>> Or, for avoiding the unnecessarily application of the workaround,
>>>> should it be changed as a fallback after the failure at the first
>>>> try...?
>>>
>>> I don't know if this helps, but I started experiencing this same issue ("hci0:
>>> command 0xfc05 tx timeout") yesterday after a kernel upgrade.
>>>
>>> My controller is a different one:
>>>
>>>     8087:0025 Intel Corp. Wireless-AC 9260 Bluetooth Adapter
>>>     ^^^^^^^^^
>>>
>>> I tried with different (older) versions of the v5.15.x kernel but none worked.
>>>
>>> Now, this is the interesting (?) part: today, when I switched on the computer
>>> to keep testing, the bluetooth was *already* working once again.
>>>
>>> I have reviewed my bash history to try to figure out what is it that I did, and
>>> the only thing I see is that yesterday, before going to sleep, I did a full
>>> poweroff instead of a reset (which is what I used yesterday to try different
>>> kernels).
>>>
>>> This does not make any sense... but then I found this [1] post from someone else
>>> who experienced the same.
>>>
>>> Is there any reasonable explanation for this? Could this be the reason why you
>>> seem to have different results with the same controller (8087:0a2a)?
>>
>> we trying to figure out what went wrong here. This should be really only an
>> issue on the really early Intel hardware like Wilkens Peak. However it seems
>> it slipped into later parts now as well. We are investigating what happened >> and see if this can be fixed via a firmware update or if we really 
have to
>> mark this hardware as having a broken boot loader.
> 
> The upstream bugzilla indicates that 8087:0aa7 seems hitting the same
> problem:
>    https://bugzilla.kernel.org/show_bug.cgi?id=215167
> 
> OTOH, on openSUSE Bugzilla, there has been a report that applying the
> workaround for 8087:0026 may cause another issue about the reset
> error, so the entry for 8087:0026 should be dropped.

Can you confirm that commit 95655456e7ce (Bluetooth: btintel: Fix broken 
LED quirk for legacy ROM devices) [1] merged in the current Linux 5.17 
cycle this week fixed the issue?


Kind regards,

Paul


[1]: 
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=95655456e7cee858a23793f67025765b4c4c227b