Re: [PATCH 1/2] Bluetooth: btmtk: Add MT6639 (MT7927) Bluetooth support

[Javier Tia <floss@jetm.me>]

Hi Luiz,

On Thu, Mar 5, 2026 Luiz Augusto von Dentz wrote:
> Ditto, we will probably some evidence this was actually tested on
> systems e.g. dmesg of the pre/post change, also in this case
> specifically we need a mediatek engineer to confim, with a
> Signed-off-by, that these changes works as intended.

Here is the dmesg evidence from my system (ASUS ROG Crosshair X870E
Hero, 0489:e13a, kernel 6.19.6).

Pre-patch (vanilla 6.19.6 btusb/btmtk, no MT6639 support):

  Bluetooth: hci0: Unsupported hardware variant (00006639)
  Bluetooth: hci0: Device setup failed (-22)

Post-patch (this series applied):

  Bluetooth: hci0: HW/SW Version: 0x00000000, Build Time: 20250606201235
  Bluetooth: hci0: Device setup in 8287370 usecs
  Bluetooth: hci0: AOSP extensions version v1.00

bluetoothctl shows the controller is fully operational:

  Controller 78:46:5C:9B:C2:C2 (public)
    Manufacturer: 0x0046 (70)
    Name: jetm-rog-crosshair-hero-x870e
    Powered: yes

This has been tested on 6 different boards across multiple distros.
The DKMS package [1] has been the primary driver for all MT7927
Bluetooth users since January.

Deren, Mingyen, Sean - could you please review the btmtk changes in
this patch and provide a Signed-off-by or Reviewed-by if the
implementation looks correct? Luiz requires a MediaTek engineer to
confirm these changes work as intended before merging.

For context: the BT firmware (BT_RAM_CODE_MT6639_2_1_hdr.bin) was
extracted from MediaTek's mtkwlan.dat combo blob shipped in the ASUS
Windows driver package (V5603998). The extraction uses a Python script
that parses the container format and pulls out the BT firmware
section. The firmware has been submitted to linux-firmware as GitLab
MR !946 [2].

The driver changes (firmware naming, section filtering, persistence
skip, CONNV3 reset) were developed by studying the Windows driver USB
captures and the existing btmtk code paths for MT7925/MT7961.

[1] https://github.com/jetm/mediatek-mt7927-dkms
[2] https://gitlab.com/kernel-firmware/linux-firmware/-/merge_requests/946

Javier