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Bluetooth: btusb: limit RTL8761B BROKEN_EXT_SCAN quirk to 0bda:a728

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Commit 5ead206361 ("Bluetooth: btrtl: fix RTL8761B/BU broken LE
extended scan") set HCI_QUIRK_BROKEN_EXT_SCAN for every CHIP_ID_8761B
device to cure repeated 0x2042 failures on an 0bda:a728 dongle. The
brokenness is per-dongle, not per-chip: on a TP-Link UB500 (2357:0604,
RTL8761BU, fw 0xdfc6d922) extended scan works, and the legacy scan
path the quirk forces is what is broken -- LE Set Scan Enable (0x200c)
times out with -110 about 30 s after firmware load, btusb resets the
device, and the adapter re-enumerates in an endless loop (382 firmware
reloads in one boot). 7.1.8, which predates the stable backport, runs
clean on this unit; 7.1.9 loops.

Move the quirk from btrtl's chip-wide switch to a btusb device-table
flag on the USB id the original fix was verified against. Other 8761B
dongles return to their earlier long-standing behaviour.

Link: https://bugzilla.redhat.com/show_bug.cgi?id=2521504
Fixes: 5ead206361 ("Bluetooth: btrtl: fix RTL8761B/BU broken LE extended scan")
Cc: stable@vger.kernel.org
Signed-off-by: Junjie Cao <junjie.cao@intel.com>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
This commit is contained in:
Junjie Cao 2026-08-24 13:32:27 +08:00 committed by Luiz Augusto von Dentz
parent a935579934
commit ca0583c246
2 changed files with 8 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
drivers/bluetooth/btrtl.c
View File

@ -1343,19 +1343,6 @@ void btrtl_set_quirks(struct hci_dev *hdev, struct btrtl_device_info *btrtl_dev)
if (!btrtl_dev->ic_info)
return;
switch (btrtl_dev->project_id) {
case CHIP_ID_8761B:
/* RTL8761B/BU reports HCI version 5.1 but does not support
* the LE Extended Scan commands (Opcode 0x2042), causing
* repeated -EBUSY failures when BlueZ attempts extended
* scanning while a connection is active.
*/
hci_set_quirk(hdev, HCI_QUIRK_BROKEN_EXT_SCAN);
break;
default:
break;
}
switch (btrtl_dev->ic_info->lmp_subver) {
case RTL_ROM_LMP_8703B:
/* 8723CS reports two pages for local ext features,

8
drivers/bluetooth/btusb.c
View File

@ -67,6 +67,7 @@ static struct usb_driver btusb_driver;
#define BTUSB_INTEL_NO_WBS_SUPPORT BIT(26)
#define BTUSB_ACTIONS_SEMI BIT(27)
#define BTUSB_BARROT BIT(28)
#define BTUSB_BROKEN_EXT_SCAN BIT(29)
static const struct usb_device_id btusb_table[] = {
/* Generic Bluetooth USB device */
@ -617,6 +618,10 @@ static const struct usb_device_id quirks_table[] = {
{ USB_DEVICE(0x0489, 0xe130), .driver_info = BTUSB_REALTEK |
BTUSB_WIDEBAND_SPEECH },
/* Realtek 8761BU Bluetooth devices */
{ USB_DEVICE(0x0bda, 0xa728), .driver_info = BTUSB_REALTEK |
BTUSB_BROKEN_EXT_SCAN },
/* Realtek Bluetooth devices */
{ USB_VENDOR_AND_INTERFACE_INFO(0x0bda, 0xe0, 0x01, 0x01),
.driver_info = BTUSB_REALTEK },
@ -4401,6 +4406,9 @@ static int btusb_probe(struct usb_interface *intf,
if (id->driver_info & BTUSB_INVALID_LE_STATES)
hci_set_quirk(hdev, HCI_QUIRK_BROKEN_LE_STATES);
if (id->driver_info & BTUSB_BROKEN_EXT_SCAN)
hci_set_quirk(hdev, HCI_QUIRK_BROKEN_EXT_SCAN);
if (id->driver_info & BTUSB_DIGIANSWER) {
data->cmdreq_type = USB_TYPE_VENDOR;
hci_set_quirk(hdev, HCI_QUIRK_RESET_ON_CLOSE);