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Fri, 14 Aug 2026 20:34:21 -0700 (PDT) Received: from localhost.localdomain ([188.162.14.60]) by smtp.gmail.com with ESMTPSA id 2adb3069b0e04-5b458beda7fsm882707e87.43.2026.08.14.20.34.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 14 Aug 2026 20:34:20 -0700 (PDT) From: Andrew Bille To: Marcel Holtmann , Luiz Augusto von Dentz Cc: Daniel Drake , linux-bluetooth@vger.kernel.org, linux-kernel@vger.kernel.org, Andrew Bille Subject: [PATCH] Bluetooth: btusb: treat 0bda:0002 as a generic HCI device Date: Sat, 15 Aug 2026 10:33:46 +0700 Message-ID: <20260815033346.15882-1-andrewbille@gmail.com> X-Mailer: git-send-email 2.47.3 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" 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 Reviewed-by: Paul Menzel --- 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[] =3D { { USB_DEVICE(0x0489, 0xe130), .driver_info =3D BTUSB_REALTEK | BTUSB_WIDEBAND_SPEECH }, =20 + /* 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 =3D BTUSB_REALTEK }, --=20 2.47.3