[PATCH] Bluetooth: btusb: treat 0bda:0002 as a generic HCI device

[PATCH] Bluetooth: btusb: treat 0bda:0002 as a generic HCI device

[Andrew Bille]

The 0bda:0002 Bluetooth controller reports itself as "CSR BS8510"
and exposes a standard Bluetooth USB interface.

It currently matches the vendor-wide Realtek quirk and is therefore
initialized through btrtl. The controller does not respond to the
Realtek-specific register access and initialization fails with:

    Bluetooth: hci0: RTL: RTL: Read reg16 failed (-110)

No Bluetooth controller is then available to userspace.

Add an exact match for 0bda:0002 before the generic Realtek entry so
that the device is handled as a generic USB HCI controller.

With this change the controller registers successfully. Scanning,
pairing and A2DP audio have been tested successfully.

Fixes: a2698a9bf9b0 ("Bluetooth: btusb: Add Realtek 8723A/8723B/8761A/8821A support")
Cc: stable@vger.kernel.org
Assisted-by: ChatGPT:GPT-5.6-Sol
Signed-off-by: Andrew Bille <andrewbille@gmail.com>
---
 drivers/bluetooth/btusb.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
index 184e95c1625e..fb9fdf90a3b9 100644
--- a/drivers/bluetooth/btusb.c
+++ b/drivers/bluetooth/btusb.c
@@ -615,6 +615,9 @@ static const struct usb_device_id quirks_table[] = {
 	{ USB_DEVICE(0x0489, 0xe130), .driver_info = BTUSB_REALTEK |
 						     BTUSB_WIDEBAND_SPEECH },
 
+	/* CSR BS8510 device using a Realtek USB vendor ID */
+	{ USB_DEVICE(0x0bda, 0x0002) },
+
 	/* Realtek Bluetooth devices */
 	{ USB_VENDOR_AND_INTERFACE_INFO(0x0bda, 0xe0, 0x01, 0x01),
 	  .driver_info = BTUSB_REALTEK },
-- 
2.47.3

RE: Bluetooth: btusb: treat 0bda:0002 as a generic HCI device

[bluez.test.bot]

[-- Attachment #1: Type: text/plain, Size: 1181 bytes --]

This is automated email and please do not reply to this email!

Dear submitter,

Thank you for submitting the patches to the linux bluetooth mailing list.
This is a CI test results with your patch series:
PW Link:https://patchwork.kernel.org/project/bluetooth/list/?series=1146378

---Test result---

Test Summary:
CheckPatch                    PASS      0.76 seconds
VerifyFixes                   PASS      0.14 seconds
VerifySignedoff               PASS      0.14 seconds
GitLint                       PASS      0.34 seconds
SubjectPrefix                 PASS      0.13 seconds
BuildKernel                   PASS      28.04 seconds
CheckAllWarning               PASS      30.77 seconds
CheckSparse                   PASS      29.76 seconds
BuildKernel32                 PASS      26.87 seconds
CheckKernelLLVM               SKIP      0.00 seconds
TestRunnerSetup               PASS      506.27 seconds
IncrementalBuild              PASS      26.54 seconds

Details
##############################
Test: CheckKernelLLVM - SKIP
Desc: Build kernel with LLVM + context analysis
Output:
Clang not found


https://github.com/bluez/bluetooth-next/pull/586

---
Regards,
Linux Bluetooth