From: Tedd Ho-Jeong An <tedd.an@xxxxxxxxx>
The some legacy ROM controllers have a bug with the first HCI command
sent to it returning number of completed commands as zero, which would
stall the command processing in the Bluetooth core.
As a workaround, send HCI Rest command first which will reset the
controller to fix the issue.
Signed-off-by: Tedd Ho-Jeong An <tedd.an@xxxxxxxxx>
---
drivers/bluetooth/btintel.c | 21 +++++++++++++++++++++
drivers/bluetooth/btintel.h | 1 +
drivers/bluetooth/btusb.c | 16 ++++++++++++++--
3 files changed, 36 insertions(+), 2 deletions(-)
diff --git a/drivers/bluetooth/btintel.c b/drivers/bluetooth/btintel.c
index bf0ad05b80fe..65ecf2ae9a10 100644
--- a/drivers/bluetooth/btintel.c
+++ b/drivers/bluetooth/btintel.c
@@ -1659,6 +1659,7 @@ static int btintel_legacy_rom_setup(struct hci_dev *hdev,
int btintel_setup_combined(struct hci_dev *hdev)
{
+ struct btintel_data *intel = hci_get_priv(hdev);
const u8 param[1] = { 0xFF };
struct intel_version ver;
struct intel_version_tlv ver_tlv;
@@ -1667,6 +1668,26 @@ int btintel_setup_combined(struct hci_dev *hdev)
BT_DBG("%s", hdev->name);
+ /* The some controllers have a bug with the first HCI command sent to it
+ * returning number of completed commands as zero. This would stall the
+ * command processing in the Bluetooth core.
+ *
+ * As a workaround, send HCI Reset command first which will reset the
+ * number of completed commands and allow normal command processing
+ * from now on.
+ */
+ if (test_bit(INTEL_BROKEN_READ_VERSION, &intel->flags)) {
+ skb = __hci_cmd_sync(hdev, HCI_OP_RESET, 0, NULL,
+ HCI_INIT_TIMEOUT);
+ if (IS_ERR(skb)) {
+ bt_dev_err(hdev,
+ "sending initial HCI reset failed (%ld)",
+ PTR_ERR(skb));
+ return PTR_ERR(skb);
+ }
+ kfree_skb(skb);
+ }
+
/* Starting from TyP device, the command parameter and response are
* changed even though the OCF for HCI_Intel_Read_Version command
* remains same. The legacy devices can handle even if the
diff --git a/drivers/bluetooth/btintel.h b/drivers/bluetooth/btintel.h
index df7aa30142b4..29b678364a79 100644
--- a/drivers/bluetooth/btintel.h
+++ b/drivers/bluetooth/btintel.h
@@ -143,6 +143,7 @@ struct intel_debug_features {
#define INTEL_FIRMWARE_LOADED 2
#define INTEL_FIRMWARE_FAILED 3
#define INTEL_BOOTING 4
+#define INTEL_BROKEN_READ_VERSION 5
struct btintel_data {
unsigned long flags;
diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
index 4cd49a758bb0..28ad13d6c032 100644
--- a/drivers/bluetooth/btusb.c
+++ b/drivers/bluetooth/btusb.c
@@ -62,6 +62,7 @@ static struct usb_driver btusb_driver;
#define BTUSB_QCA_WCN6855 0x1000000
#define BTUSB_INTEL_NEWGEN 0x2000000
#define BTUSB_INTEL_COMBINED 0x4000000
+#define BTUSB_INTEL_BROKEN_READ_VERSION 0x8000000
static const struct usb_device_id btusb_table[] = {
/* Generic Bluetooth USB device */
@@ -376,11 +377,14 @@ static const struct usb_device_id blacklist_table[] = {
BTUSB_WIDEBAND_SPEECH |
BTUSB_VALID_LE_STATES },
{ USB_DEVICE(0x8087, 0x07da), .driver_info = BTUSB_CSR },
- { USB_DEVICE(0x8087, 0x07dc), .driver_info = BTUSB_INTEL_COMBINED },
- { USB_DEVICE(0x8087, 0x0a2a), .driver_info = BTUSB_INTEL_COMBINED },
+ { USB_DEVICE(0x8087, 0x07dc), .driver_info = BTUSB_INTEL_COMBINED |
+ BTUSB_INTEL_BROKEN_READ_VERSION },
+ { USB_DEVICE(0x8087, 0x0a2a), .driver_info = BTUSB_INTEL_COMBINED |
+ BTUSB_INTEL_BROKEN_READ_VERSION },
{ USB_DEVICE(0x8087, 0x0a2b), .driver_info = BTUSB_INTEL_NEW |
BTUSB_WIDEBAND_SPEECH },
{ USB_DEVICE(0x8087, 0x0aa7), .driver_info = BTUSB_INTEL_COMBINED |
+ BTUSB_INTEL_BROKEN_READ_VERSION |
BTUSB_WIDEBAND_SPEECH },
{ USB_DEVICE(0x8087, 0x0aaa), .driver_info = BTUSB_INTEL_NEW |
BTUSB_WIDEBAND_SPEECH |
@@ -4221,6 +4225,11 @@ static int btusb_probe(struct usb_interface *intf,
priv_size = 0;
+ if (id->driver_info & BTUSB_INTEL_COMBINED) {
+ /* Allocate extra space for Intel device */
+ priv_size += sizeof(struct btintel_data);
+ }
+
if (id->driver_info & BTUSB_INTEL_NEW) {
data->recv_event = btusb_recv_event_intel;
data->recv_bulk = btusb_recv_bulk_intel;
@@ -4315,6 +4324,9 @@ static int btusb_probe(struct usb_interface *intf,
set_bit(HCI_QUIRK_STRICT_DUPLICATE_FILTER, &hdev->quirks);
set_bit(HCI_QUIRK_SIMULTANEOUS_DISCOVERY, &hdev->quirks);
set_bit(HCI_QUIRK_NON_PERSISTENT_DIAG, &hdev->quirks);
+
+ if (id->driver_info & BTUSB_INTEL_BROKEN_READ_VERSION)
+ btintel_set_flags(hdev, INTEL_BROKEN_READ_VERSION);
}
if (id->driver_info & BTUSB_INTEL_NEW) {
--
2.26.3
