linux-kernel - RE: 5.16.0-rc7+ Bluetooth error

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Date:   Mon, 3 Jan 2022 09:55:04 +0000
From:   "K, Kiran" <kiran.k@...el.com>
To:     Luiz Augusto von Dentz <luiz.dentz@...il.com>,
        Chris Clayton <chris2553@...glemail.com>
CC:     LKML <linux-kernel@...r.kernel.org>,
        "linux-bluetooth@...r.kernel.org" <linux-bluetooth@...r.kernel.org>
Subject: RE: 5.16.0-rc7+ Bluetooth error

Hi Luiz, Chris,

> -----Original Message-----
> From: Luiz Augusto von Dentz <luiz.dentz@...il.com>
> Sent: Saturday, January 1, 2022 1:23 AM
> To: Chris Clayton <chris2553@...glemail.com>
> Cc: LKML <linux-kernel@...r.kernel.org>; linux-bluetooth@...r.kernel.org;
> K, Kiran <kiran.k@...el.com>
> Subject: Re: 5.16.0-rc7+ Bluetooth error
> 
> Hi Chris,
> 
> On Fri, Dec 31, 2021 at 2:35 AM Chris Clayton <chris2553@...glemail.com>
> wrote:
> >
> > On 30/12/2021 09:21, Chris Clayton wrote:
> > > Hi,
> > >
> > > I pulled the latest changes into my clone of Linus' tree and built
> > > and installed the kernel. (git describe gives
> > > v5.16-rc7-9-ge7c124bd0463). I'm seeing errors reported by the
> > > bluetooth subsystem that i don't see in 5.15.12 or 5.10.89
> > >
> > > The problem seems to occur twice during system startup and on each
> occasion I see a batch of identical error messages:
> > >
> > > [    3.980822] Bluetooth: hci0: Failed to read codec capabilities (-56)
> > > [    3.982812] Bluetooth: hci0: Failed to read codec capabilities (-56)
> > > [    3.984812] Bluetooth: hci0: Failed to read codec capabilities (-56)
> > > [    3.986608] Bluetooth: hci0: Failed to read codec capabilities (-56)
> > > [    3.987621] Bluetooth: hci0: Failed to read codec capabilities (-56)
> > > [    3.988606] Bluetooth: hci0: Failed to read codec capabilities (-56)
> > > [    3.989650] Bluetooth: hci0: Failed to read codec capabilities (-56)
> > >
> >
> > Sorry, I should have said that despite the above errors, my bluetooth
> devices still work fine.
> 
> Would be great to have the HCI trace (btmon).
> 
> @Kiran K Is this to be expected?

May be the BT controller here is not supporting HCI_READ_CODEC_CAPABILITIES command.

This has been fixed - https://git.kernel.org/pub/scm/linux/kernel/git/bluetooth/bluetooth-next.git/commit/?id=107fe0482b549a0e43a971e5fd104719c6e495ef

A check has been added to read codec capabilities only if supported.

Thanks,
Kiran