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[v7,05/12] Bluetooth: btintel: Fix the first HCI command not work with ROM device

Message ID 20210805003219.23221-6-hj.tedd.an@gmail.com (mailing list archive)
State Accepted
Delegated to: Luiz Von Dentz
Headers show
Series Bluetooth: btintel: Refactoring setup routines | expand

Commit Message

Tedd Ho-Jeong An Aug. 5, 2021, 12:32 a.m. UTC 
From: Tedd Ho-Jeong An <tedd.an@intel.com>

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>
---
 drivers/bluetooth/btintel.c | 20 ++++++++++++++++++++
 drivers/bluetooth/btintel.h |  1 +
 drivers/bluetooth/btusb.c   |  7 ++++++-
 3 files changed, 27 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/drivers/bluetooth/btintel.c b/drivers/bluetooth/btintel.c
index a6d75afad71b..8e6b497a2164 100644
--- a/drivers/bluetooth/btintel.c
+++ b/drivers/bluetooth/btintel.c
@@ -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
diff --git a/drivers/bluetooth/btintel.h b/drivers/bluetooth/btintel.h
index fb5e73ef71eb..8a49795ad5af 100644
--- a/drivers/bluetooth/btintel.h
+++ b/drivers/bluetooth/btintel.h
@@ -144,6 +144,7 @@  enum {
 	INTEL_FIRMWARE_LOADED,
 	INTEL_FIRMWARE_FAILED,
 	INTEL_BOOTING,
+	INTEL_BROKEN_INITIAL_NCMD,
 
 	__INTEL_NUM_FLAGS,
 };
diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
index 887b8839e4b2..3ed552d80b66 100644
--- a/drivers/bluetooth/btusb.c
+++ b/drivers/bluetooth/btusb.c
@@ -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) {