[Bug 221521] Bluetooth: btusb/mt7921 - Failed to send wmt func ctrl (-22) on MediaTek MT7921 combo adapter

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=221521

Solarized (p@atiq.xyz) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |p@atiq.xyz

--- Comment #15 from Solarized (p@atiq.xyz) ---
repros on kernel 7.0.9 on Asus ProArt 7606WV (has mediatek wireless chip)

if you peak into kernel log using `journalctl` you will find this:

```plain
Jun 06 13:19:30 kernel: cs35l56-hda i2c-CSC3556:00-cs35l56-hda.0: DSP1:
cirrus/cs35l56-b0-dsp1-misc-10431e63-spkid1-amp1.bin (v1): v3.11.16
Jun 06 13:19:30 kernel: cs35l56-hda i2c-CSC3556:00-cs35l56-hda.0: DSP1: misc:
C:\Users\gchen\Desktop\Asus_proj\CY24\MP\H7606W\240830\init\10431E63_240830_V1_A0-init.bin
Jun 06 13:19:30 kernel: Bluetooth: hci0: Failed to send wmt func ctrl (-22)
Jun 06 13:19:30 kernel: Bluetooth: hci0: HCI Enhanced Setup Synchronous
Connection command is advertised, but not supported.
Jun 06 13:19:30 kernel: zram0: detected capacity change from 0 to 33554432
Jun 06 13:19:30 kernel: cs35l56-hda i2c-CSC3556:00-cs35l56-hda.1: Calibration
applied
Jun 06 13:19:30 kernel: cs35l56-hda i2c-CSC3556:00-cs35l56-hda.0: Calibration
applied
Jun 06 13:19:30 kernel: cs35l56-hda i2c-CSC3556:00-cs35l56-hda.1: Tuning PID:
0x531116, SID: 0x201104, TID: 0x3c8830
Jun 06 13:19:30 kernel: cs35l56-hda i2c-CSC3556:00-cs35l56-hda.0: Tuning PID:
0x531116, SID: 0x201004, TID: 0x3c8830
Jun 06 13:19:31 kernel: NVRM: testIfDsmSubFunctionEnabled: GPS ACPI DSM called
before _acpiDsmSupportedFuncCacheInit subfunction = 10.
Jun 06 13:19:31 kernel: NVRM: testIfDsmSubFunctionEnabled: GPS ACPI DSM called
before _acpiDsmSupportedFuncCacheInit subfunction = 11.
Jun 06 13:19:31 kernel: [drm] Initialized nvidia-drm 0.0.0 for 0000:64:00.0 on
minor 1

```
which indicates broken bluetooth mediatek driver.


And, service log, shows following

```plain
$ journalctl --boot --unit bluetooth.service
Jun 06 13:19:29 systemd[1]: Starting bluetooth.service - Bluetooth service...
Jun 06 13:19:29 (uetoothd)[1329]: bluetooth.service: ConfigurationDirectory
'bluetooth' already exists but the mode is different. (File system: 755
ConfigurationDirectoryMode: 555)
Jun 06 13:19:29 bluetoothd[1329]: Bluetooth daemon 5.72
Jun 06 13:19:29 bluetoothd[1329]: Starting SDP server
Jun 06 13:19:29 bluetoothd[1329]: src/plugin.c:plugin_init() System does not
support csip plugin
Jun 06 13:19:29 bluetoothd[1329]: profiles/audio/micp.c:micp_init() D-Bus
experimental not enabled
Jun 06 13:19:29 bluetoothd[1329]: src/plugin.c:plugin_init() System does not
support micp plugin
Jun 06 13:19:29 bluetoothd[1329]: src/plugin.c:plugin_init() System does not
support vcp plugin
Jun 06 13:19:29 bluetoothd[1329]: src/plugin.c:plugin_init() System does not
support mcp plugin
Jun 06 13:19:29 bluetoothd[1329]: src/plugin.c:plugin_init() System does not
support bass plugin
Jun 06 13:19:29 bluetoothd[1329]: src/plugin.c:plugin_init() System does not
support bap plugin
Jun 06 13:19:29 bluetoothd[1329]: Bluetooth management interface 1.23
initialized
Jun 06 13:19:29 systemd[1]: Started bluetooth.service - Bluetooth service.
```

Related:
-
https://lore.kernel.org/all/81bcf9fd-2f07-4fc6-be90-da4e448379e4@leemhuis.info/
-
https://www.reddit.com/r/linuxhardware/comments/1tfn5ev/mediatek_mt7921_bluetooth_not_initializing/

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