The interrupt interface for the Intel USB bootloader devices is only
enabled after receiving SetInterface(0, AltSetting=0). When this USB
command is not send, then no HCI events will be received.
Signed-off-by: Marcel Holtmann <marcel@xxxxxxxxxxxx>
---
drivers/bluetooth/btusb.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
index 14314a12babe..fe24f600ed65 100644
--- a/drivers/bluetooth/btusb.c
+++ b/drivers/bluetooth/btusb.c
@@ -1807,6 +1807,18 @@ static int btusb_probe(struct usb_interface *intf,
data->isoc = NULL;
}
+ if (id->driver_info & BTUSB_INTEL_BOOT) {
+ /* A bug in the bootloader causes that interrupt interface is
+ * only enabled after receiving SetInterface(0, AltSetting=0).
+ */
+ err = usb_set_interface(data->udev, 0, 0);
+ if (err < 0) {
+ BT_ERR("failed to set interface 0, alt 0 %d", err);
+ hci_free_dev(hdev);
+ return err;
+ }
+ }
+
if (data->isoc) {
err = usb_driver_claim_interface(&btusb_driver,
data->isoc, data);
--
1.9.3
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