On 03/01/2022 09:55, K, Kiran wrote: > Hi Luiz, Chris, > >> -----Original Message----- >> From: Luiz Augusto von Dentz <luiz.dentz@xxxxxxxxx> >> Sent: Saturday, January 1, 2022 1:23 AM >> To: Chris Clayton <chris2553@xxxxxxxxxxxxxx> >> Cc: LKML <linux-kernel@xxxxxxxxxxxxxxx>; linux-bluetooth@xxxxxxxxxxxxxxx; >> K, Kiran <kiran.k@xxxxxxxxx> >> Subject: Re: 5.16.0-rc7+ Bluetooth error >> >> Hi Chris, >> >> On Fri, Dec 31, 2021 at 2:35 AM Chris Clayton <chris2553@xxxxxxxxxxxxxx> >> 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 > I've applied the patch to 5.16.0-rc8 and the error messages are no longer produced. My bluetooth devices are stiil working. Tested-By: Chris Clayton <chris2553@xxxxxxxxxxxxxx> > A check has been added to read codec capabilities only if supported. > > Thanks, > Kiran >
