RE: BT Intel: Regression loading firmware in linux-5.13-rc3

["K, Kiran" <kiran.k@intel.com>]

Hi Chris,

This is a known issue related to firmware and is expected to be fixed in next release.

Thanks,
Kiran


> -----Original Message-----
> From: Chris Clayton <chris2553@googlemail.com>
> Sent: Tuesday, May 25, 2021 3:28 PM
> To: linux-bluetooth@vger.kernel.org; Von Dentz, Luiz
> <luiz.von.dentz@intel.com>
> Subject: BT Intel: Regression loading firmware in linux-5.13-rc3
> 
> Hi,
> 
> I've built and installed 5.13-rc3+ (freshly pulled from Linus' tree). On booting
> it I find that none of my bluetooth devices can connect. In the output from
> dmesg I find:
> 
> [    8.170332] Bluetooth: hci0: Firmware revision 0.0 build 121 week 7 2021
> [    8.171339] bluetooth hci0: Direct firmware load for intel/ibt-19-16-0.sfi
> failed with error -2
> [    8.171871] Bluetooth: hci0: Failed to load Intel firmware file intel/ibt-19-16-
> 0.sfi (-2)
> 
> As you can see it is looking for a non-existent firmware file intel/ibt-19-16-
> 0.sfi. intel/ibt-19-16-4.{ddc,sfi} do exist and both 5.12.6 and 5.10.39
> successfully load those.
> 
> If I create symbolic links from the ibt-19-16-4 files to ibt-19-16-0 equivalents,
> rc3 loads them and my bluetooth devices work fine. I can't find any ibt-19-16-
> 0 files in the lkinux-firmware tree on kernel.org (or anywhere else for that
> matter).
> 
> I looked at the changes introduced in 5.13 and found a couple of suspects -
> d68903da4e220d1e6b7c6ecdb853c36144c6acc9
> (Bluetooth: btintel: Consolidate intel_version parsing) and its parent commit
> 0a460d8fe2db6887169a19b048ea0c90f8bdc3b7
> (Bluetooth: btintel: Consolidate intel_version_tlv parsing). Both were
> authored by Luiz Augusto von Dentz and make changes to code that
> processes the firmware version data. I built a kernel with
> 0a460d8fe2db6887169a19b048ea0c90f8bdc3b7
> checked out and that loads the installed firmware fine.
> d68903da4e220d1e6b7c6ecdb853c36144c6acc9, however, seems to be the
> the change that breaks things because it tries (and obviously fails) to load ibt-
> 19-16-0.sfi.
> 
> I can provide any additional diagnostics or test a fix, but please copy me in to
> any email because I'm not subscribed to the list.
> 
> In the meantime, I'll use my symlinks workaround.
> 
> Thanks,
> 
> Chris