[Bug 216382] New: [bisected][regression] mediatek bluetooth 13d3:3563 (mt7921e) doesn't work with audio devices.

[Bug 216382] New: [bisected][regression] mediatek bluetooth 13d3:3563 (mt7921e) doesn't work with audio devices.

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=216382

            Bug ID: 216382
           Summary: [bisected][regression] mediatek bluetooth 13d3:3563
                    (mt7921e) doesn't work with audio devices.
           Product: Drivers
           Version: 2.5
    Kernel Version: 6.0-rc1
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Bluetooth
          Assignee: linux-bluetooth@vger.kernel.org
          Reporter: arek.rusi@gmail.com
        Regression: No

After update to new 6.0rc1 I can't use any bt-earphones.  
I've checked in bluetoothctl: devices are still connected but none of
endpoint/transport entries are creates.

XB1S gamepad works without any issues.

bisecting result:
---
26afbd826ee326e63a334c37fd45e82e50a615ec is the first bad commit
commit 26afbd826ee326e63a334c37fd45e82e50a615ec
Author: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Date:   Mon Jul 29 18:15:43 2019 +0300

    Bluetooth: Add initial implementation of CIS connections

    This adds the initial implementation of CIS connections and introduces
    the ISO packets/links.
---

can't revert this commit. 

*Aditionally, I've tried this kernel on second machine with AX210 wifi/bt combo
and issue doesn't appear. So I assume problem is limited to mediatek module.

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[Bug 216382] [bisected][regression] mediatek bluetooth 13d3:3563 (mt7921e) doesn't work with audio devices.

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=216382

Luiz Von Dentz (luiz.dentz@gmail.com) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |luiz.dentz@gmail.com

--- Comment #1 from Luiz Von Dentz (luiz.dentz@gmail.com) ---
I suspect this could be due some HCI command during initialization, could you
please collect the HCI using btmon?

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[Bug 216382] [bisected][regression] mediatek bluetooth 13d3:3563 (mt7921e) doesn't work with audio devices.

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=216382

--- Comment #2 from Arek Ruśniak (arek.rusi@gmail.com) ---
Created attachment 301608
  --> https://bugzilla.kernel.org/attachment.cgi?id=301608&action=edit
btmon -w log # 6.0-rc1

Hi,
this is log for rc1, hope it's not a big problem.

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[Bug 216382] [bisected][regression] mediatek bluetooth 13d3:3563 (mt7921e) doesn't work with audio devices.

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=216382

--- Comment #3 from Arek Ruśniak (arek.rusi@gmail.com) ---
Created attachment 301609
  --> https://bugzilla.kernel.org/attachment.cgi?id=301609&action=edit
btmon -w log # 5.19x

this is log for connected/worked device.

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[Bug 216382] [bisected][regression] mediatek bluetooth 13d3:3563 (mt7921e) doesn't work with audio devices.

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=216382

--- Comment #4 from Luiz Von Dentz (luiz.dentz@gmail.com) ---
Created attachment 301727
  --> https://bugzilla.kernel.org/attachment.cgi?id=301727&action=edit
Patch

This shall fix the problem, weird that CI didn't find it though since it quite
clear that ACL buffers will not be initialized thus preventing any ACL traffic.

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[Bug 216382] [bisected][regression] mediatek bluetooth 13d3:3563 (mt7921e) doesn't work with audio devices.

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https://bugzilla.kernel.org/show_bug.cgi?id=216382

--- Comment #5 from Arek Ruśniak (arek.rusi@gmail.com) ---
thanks Luiz for fix this, i've tested it on top rc3 & master and my headphones
live again.

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[Bug 216382] [bisected][regression] mediatek bluetooth 13d3:3563 (mt7921e) doesn't work with audio devices.

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=216382

Arek Ruśniak (arek.rusi@gmail.com) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |CODE_FIX

--- Comment #6 from Arek Ruśniak (arek.rusi@gmail.com) ---
fixed in rc5

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