MT7922 does not work in 7.1-rc3, works ok in 7.0

["Taneli Vähäkangas" <taneli@vii.li>]

Hey, this might be also a mishap on my side, not yet familiar enough 
with pacman to say with certainty I didn't mess up something (like 
firmware loading), but here goes anyway.

Bluetooth is provided by:
Bus 001 Device 003: ID 0e8d:0616 MediaTek Inc. Wireless_Device
I believe. This is a gmktec nucbox k8 plus by dmi information.

With distribution's 7.0 kernel bluetooth shows up fine in Gnome and I 
can connect my headphones and get audio. Using "linux-git" package, 
which built 7.1-rc3 (+ some commits on top in torvalds tree). Booting to 
it, bluetooth can't be enabled in Gnome, everything stays grayed out and 
no devices are shown. (I tried 7.1-rc1 earlier, which also didn't work, 
but I didn't take any notes back then.)

The difference in dmesg is that on 7.0:
[    6.152649] Bluetooth: hci0: Device setup in 173263 usecs
[    6.152661] Bluetooth: hci0: HCI Enhanced Setup Synchronous 
Connection command is advertised, but not supported.
[    6.216582] Bluetooth: hci0: AOSP extensions version v1.00
[    6.216593] Bluetooth: hci0: AOSP quality report is supported
8<-- 8<--

And on 7.1-rc3:
[    6.270455] Bluetooth: hci0: Failed to send wmt func ctrl (-22)
[    6.270466] Bluetooth: hci0: HCI Enhanced Setup Synchronous 
Connection command is advertised, but not supported.
8<-- 8<--

There are some changes in btmtk.c between these versions, but can't see 
on glance anything wrong with them, only adding support for MT6639.

I'm not on the list, please Cc: if I can provide more info.

Cheers,

	Taneli