[Bug 219405] New: [regression] mt7922 bluetooth scanning does not work in 6.11.4

[Bug 219405] New: [regression] mt7922 bluetooth scanning does not work in 6.11.4

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=219405

            Bug ID: 219405
           Summary: [regression] mt7922 bluetooth scanning does not work
                    in 6.11.4
           Product: Drivers
           Version: 2.5
          Hardware: AMD
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P3
         Component: Bluetooth
          Assignee: linux-bluetooth@vger.kernel.org
          Reporter: eugene.shalygin@gmail.com
        Regression: No

6.11.3 -> 6.11.4 update broke bluetooth scanning for mt7922. 

09:00.0 Network controller: MEDIATEK Corp. MT7922 802.11ax PCI Express Wireless
Network Adapter
    Subsystem: Foxconn International, Inc. Device e0cd
    Kernel driver in use: mt7921e
    Kernel modules: mt7921e

With 6.11.3:
$ dmesg| grep -i bluetooth                                                     
                                                                               
                                                                [    5.170554]
Bluetooth: Core ver 2.22
[    5.170762] NET: Registered PF_BLUETOOTH protocol family
[    5.170949] Bluetooth: HCI device and connection manager initialized
[    5.171130] Bluetooth: HCI socket layer initialized
[    5.171313] Bluetooth: L2CAP socket layer initialized
[    5.171495] Bluetooth: SCO socket layer initialized
[    6.574657] Bluetooth: hci0: HW/SW Version: 0x008a008a, Build Time:
20240716163633
[    6.614305] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[    6.614311] Bluetooth: BNEP filters: protocol multicast
[    6.614316] Bluetooth: BNEP socket layer initialized
[   27.410062] Bluetooth: hci0: Device setup in 20480957 usecs
[   27.410070] Bluetooth: hci0: HCI Enhanced Setup Synchronous Connection
command is advertised, but not supported.
[   27.687794] Bluetooth: hci0: AOSP extensions version v1.00
[   27.687800] Bluetooth: hci0: AOSP quality report is supported
[   27.687914] Bluetooth: MGMT ver 1.23
[   27.687951] Bluetooth: ISO socket layer initialized
[   27.784423] Bluetooth: RFCOMM TTY layer initialized
[   27.784430] Bluetooth: RFCOMM socket layer initialized
[   27.784432] Bluetooth: RFCOMM ver 1.11
[   27.955038] Bluetooth: hci0: Invalid LTK for a8:79:8d:fe:ef:cb

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[Bug 219405] [regression] mt7922 bluetooth scanning does not work in 6.11.4

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=219405

--- Comment #1 from Eugene Shalygin (eugene.shalygin@gmail.com) ---
With 6.11.4
# btmon
Bluetooth monitor ver 5.78
btmon[3582]: = Note: Linux version 6.11.4-gentoo (x86_64)                      
                                                                               
                                                                               
  0.553232
btmon[3582]: = Note: Bluetooth subsystem version 2.22                          
                                                                               
                                                                               
  0.553233
= New Index: 10:B1:DF:B8:17:42 (Primary,USB,hci0)                              
                                                                               
                                                                          
[hci0] 0.553234
= Open Index: 10:B1:DF:B8:17:42                                                
                                                                               
                                                                          
[hci0] 0.553234
= Index Info: 10:B1:DF:B8:17:42 (MediaTek, Inc.)                               
                                                                               
                                                                          
[hci0] 0.553234
bluetoothd[1187]: @ MGMT Open: bluetoothd (privileged) version 1.23            
                                                                               
                                                                        
{0x0001} 0.553235
bluetoothd[1187]: @ MGMT Command: Start Discovery (0x0023) plen 1              
                                                                               
                                                                 {0x0001}
[hci0] 12.563728
        Address type: 0x07
          BR/EDR
          LE Public
          LE Random
@ MGMT Event: Command Complete (0x0001) plen 4                                 
                                                                               
                                                                 {0x0001}
[hci0] 12.563758
      Start Discovery (0x0023) plen 1
        Status: Success (0x00)
        Address type: 0x07
          BR/EDR
          LE Public
          LE Random
@ MGMT Event: Discovering (0x0013) plen 2                                      
                                                                               
                                                                 {0x0001}
[hci0] 12.563764
        Address type: 0x07
          BR/EDR
          LE Public
          LE Random
        Discovery: Enabled (0x01)

And nothing more appears.

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[Bug 219405] [regression] mt7922 bluetooth scanning does not work in 6.11.4

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https://bugzilla.kernel.org/show_bug.cgi?id=219405

--- Comment #2 from Eugene Shalygin (eugene.shalygin@gmail.com) ---
Connecting to paired devices is broken as well.

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[Bug 219405] [regression] mt7922 bluetooth scanning does not work in 6.11.4

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https://bugzilla.kernel.org/show_bug.cgi?id=219405

Eugene Shalygin (eugene.shalygin@gmail.com) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Kernel Version|                            |6.11.4
         Regression|No                          |Yes

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[Bug 219405] [regression] mt7922 bluetooth scanning does not work in 6.11.4

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https://bugzilla.kernel.org/show_bug.cgi?id=219405

--- Comment #3 from Eugene Shalygin (eugene.shalygin@gmail.com) ---
Reverting e63125eec47dcc169cf62a2a56448bec92a0a271 makes it work.

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[Bug 219405] [regression] mt7922 bluetooth scanning does not work in 6.11.4

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=219405

Eugene Shalygin (eugene.shalygin@gmail.com) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
 Bisected commit-id|                            |e63125eec47dcc169cf62a2a564
                   |                            |48bec92a0a271

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[Bug 219405] [regression] mt7922 bluetooth scanning does not work in 6.11.4

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=219405

Paul Menzel (pmenzel+bugzilla.kernel.org@molgen.mpg.de) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |pmenzel+bugzilla.kernel.org
                   |                            |@molgen.mpg.de,
                   |                            |regressions@leemhuis.info

--- Comment #4 from Paul Menzel (pmenzel+bugzilla.kernel.org@molgen.mpg.de) ---
Thank you for your report and pinpointing the breaking commit. It’s a known
regression, and commit 4084286151 (Bluetooth: btusb: Fix not being able to
reconnect after suspend) [1] should fix it. It was queued as a 6.11-stable
review patch yesterday, and should make it into Linux 6.11.5.


[1]:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=4084286151fc91cd093578f615bfb68f9efbbfcb
[2]:
https://lore.kernel.org/stable/20241021102303.120595342@linuxfoundation.org/T/#u

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[Bug 219405] [regression] mt7922 bluetooth scanning does not work in 6.11.4

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=219405

Eugene Shalygin (eugene.shalygin@gmail.com) changed:

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

--- Comment #5 from Eugene Shalygin (eugene.shalygin@gmail.com) ---
Thanks for the feedback! Can confirm 4084286151fc91cd093578f615bfb68f9efbbfcb
fixes this problem as well.

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