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Code Issues Releases Wiki Activity

Bluetooth: btintel: Fix the first HCI command not work with ROM device

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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@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Tedd Ho-Jeong An 2021-08-04 17:32:12 -07:00 committed by Marcel Holtmann
parent 53492a668e
commit ea7c4c0e44
3 changed files with 27 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

20
drivers/bluetooth/btintel.c
View file

@ -1676,6 +1676,26 @@ static 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 (btintel_test_flag(hdev, INTEL_BROKEN_INITIAL_NCMD)) {
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

1
drivers/bluetooth/btintel.h
View file

@ -144,6 +144,7 @@ enum {
INTEL_FIRMWARE_LOADED,
INTEL_FIRMWARE_FAILED,
INTEL_BOOTING,
INTEL_BROKEN_INITIAL_NCMD,
__INTEL_NUM_FLAGS,
};

7
drivers/bluetooth/btusb.c
View file

@ -61,6 +61,7 @@ static struct usb_driver btusb_driver;
#define BTUSB_VALID_LE_STATES 0x800000
#define BTUSB_QCA_WCN6855 0x1000000
#define BTUSB_INTEL_NEWGEN 0x2000000
#define BTUSB_INTEL_BROKEN_INITIAL_NCMD 0x4000000
static const struct usb_device_id btusb_table[] = {
/* Generic Bluetooth USB device */
@ -372,7 +373,8 @@ 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, 0x07dc), .driver_info = BTUSB_INTEL_COMBINED |
BTUSB_INTEL_BROKEN_INITIAL_NCMD },
{ USB_DEVICE(0x8087, 0x0a2a), .driver_info = BTUSB_INTEL_COMBINED },
{ USB_DEVICE(0x8087, 0x0a2b), .driver_info = BTUSB_INTEL_NEW |
BTUSB_WIDEBAND_SPEECH },
@ -4489,6 +4491,9 @@ 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_INITIAL_NCMD)
btintel_set_flag(hdev, INTEL_BROKEN_INITIAL_NCMD);
}
if (id->driver_info & BTUSB_INTEL_NEW) {