lkml.org 
[lkml]   [2021]   [Feb]   [21]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] Bluetooth: btusb: Always fallback to alt 1 for WBS
[+cc stable@vger.kernel.org]

Hi,

On Sat, Feb 06, 2021 at 04:56:53PM +0100, Sjoerd Simons wrote:
> On Fri, Dec 18, 2020 at 10:23:08PM +0100, Marcel Holtmann wrote:
> > Hi Trent,
> >
> > > When alt mode 6 is not available, fallback to the kernel <= 5.7 behavior
> > > of always using alt mode 1.
> > >
> > > Prior to kernel 5.8, btusb would always use alt mode 1 for WBS (Wide
> > > Band Speech aka mSBC aka transparent SCO). In commit baac6276c0a9
> > > ("Bluetooth: btusb: handle mSBC audio over USB Endpoints") this
> > > was changed to use alt mode 6, which is the recommended mode in the
> > > Bluetooth spec (Specifications of the Bluetooth System, v5.0, Vol 4.B
> > > §2.2.1). However, many if not most BT USB adapters do not support alt
> > > mode 6. In fact, I have been unable to find any which do.
>
> > patch has been applied to bluetooth-next tree.
>
> For easier application to the stable tree(s) this should probably get:
> Fixes: baac6276c0a9 ("Bluetooth: btusb: handle mSBC audio over USB Endpoints")
>
> In my testing this indeed fixes mSBC audio with both a Belkin (Broadcom
> BCM20702A, 050d:065a) and an Intel Bluetooth (8087:0a2b) adapters.
>
> Tested-By: Sjoerd Simons <sjoerd@collabora.com>

Tested on Intel AX200 Bluetooth (8087:0029):

Tested-by: Sebastian Reichel <sre@kernel.org>

The patch has been merged to Linus' tree today and I think it should
be applied to the 5.10 tree, which is used by Debian. This patch is
required to use BT headset with bidirectional-audio in acceptable
quality (That also requires proper userspace software, e.g. pipewire
0.3.22, which Sjoerd uploaded to Debian experimental).

Patch applies cleanly on 5.10.

Thanks,

-- Sebastian
[unhandled content-type:application/pgp-signature]
\
 
 \ /
  Last update: 2021-02-21 21:37    [W:0.064 / U:2.036 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site