[PATCH v2] Bluetooth: btusb: Add Lite-On 04ca:3807 for MediaTek MT7921
From: Dylan Eray
Date: Thu Feb 19 2026 - 14:34:10 EST
Add USB device ID (04ca:3807) for a Lite-On Wireless_Device containing
a MediaTek MT7921 (MT7920) Bluetooth chipset found in Acer laptops.
Without this entry, btusb binds via the generic USB class-based wildcard
match but never sets the BTUSB_MEDIATEK flag. This means btmtk never
triggers firmware loading, and the driver sends a raw HCI Reset that
the uninitialized chip cannot respond to, resulting in:
Bluetooth: hci0: Opcode 0x0c03 failed: -110
The information in /sys/kernel/debug/usb/devices about the Bluetooth
device is listed as the below:
T: Bus=03 Lev=01 Prnt=01 Port=09 Cnt=01 Dev#=5 Spd=480 MxCh=0
P: Vendor=04ca ProdID=3807 Rev=1.00
S: Manufacturer=MediaTek Inc.
S: Product=Wireless_Device
S: SerialNumber=000000000
C: #Ifs= 3 Cfg#= 1 Atr=e0 MxPwr=100mA
I: If#= 0 Alt= 0 #EPs= 3 Cls=e0(wlcon) Sub=01 Prot=01 Driver=btusb
I: If#= 1 Alt= 0 #EPs= 2 Cls=e0(wlcon) Sub=01 Prot=01 Driver=btusb
I: If#= 2 Alt= 0 #EPs= 2 Cls=e0(wlcon) Sub=01 Prot=01 Driver=(none)
Reviewed-by: Paul Menzel <pmenzel@xxxxxxxxxxxxx>
Signed-off-by: Dylan Eray <dylan.eray6@xxxxxxxxx>
---
drivers/bluetooth/btusb.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
index fcec8e5..fd637cf 100644
--- a/drivers/bluetooth/btusb.c
+++ b/drivers/bluetooth/btusb.c
@@ -705,6 +705,8 @@ static const struct usb_device_id quirks_table[] = {
BTUSB_WIDEBAND_SPEECH },
{ USB_DEVICE(0x04ca, 0x3804), .driver_info = BTUSB_MEDIATEK |
BTUSB_WIDEBAND_SPEECH },
+ { USB_DEVICE(0x04ca, 0x3807), .driver_info = BTUSB_MEDIATEK |
+ BTUSB_WIDEBAND_SPEECH },
{ USB_DEVICE(0x04ca, 0x38e4), .driver_info = BTUSB_MEDIATEK |
BTUSB_WIDEBAND_SPEECH },
{ USB_DEVICE(0x13d3, 0x3568), .driver_info = BTUSB_MEDIATEK |
--
2.53.0