Bluetooth: mediatek: fix the conflict between mtk and msft vendor event

There is a conflict between MediaTek wmt event and msft vendor extension
logic in the core layer since 145373cb1b ("Bluetooth: Add framework for
Microsoft vendor extension") was introduced because we changed the type of
mediatek wmt event to the type of msft vendor event in the driver.

But the purpose we reported mediatek event to the core layer is for the
diagnostic purpose with that we are able to see the full packet trace via
monitoring socket with btmon. Thus, it is harmless we keep the original
type of mediatek vendor event here to avoid breaking the msft extension
function especially they can be supported by Mediatek chipset like MT7921
, MT7922 devices and future devices.

Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

drivers/bluetooth/btmtk.h

@@ -5,6 +5,7 @@
 #define FIRMWARE_MT7668		"mediatek/mt7668pr2h.bin"
 #define FIRMWARE_MT7961		"mediatek/BT_RAM_CODE_MT7961_1_2_hdr.bin"
 
+#define HCI_EV_WMT 0xe4
 #define HCI_WMT_MAX_EVENT_SIZE		64
 
 #define BTMTK_WMT_REG_WRITE 0x1

drivers/bluetooth/btmtksdio.c

@@ -381,13 +381,6 @@ static int btmtksdio_recv_event(struct hci_dev *hdev, struct sk_buff *skb)
 	struct hci_event_hdr *hdr = (void *)skb->data;
 	int err;
 
-	/* Fix up the vendor event id with 0xff for vendor specific instead
-	 * of 0xe4 so that event send via monitoring socket can be parsed
-	 * properly.
-	 */
-	if (hdr->evt == 0xe4)
-		hdr->evt = HCI_EV_VENDOR;
-
 	/* When someone waits for the WMT event, the skb is being cloned
 	 * and being processed the events from there then.
 	 */
@@ -403,7 +396,7 @@ static int btmtksdio_recv_event(struct hci_dev *hdev, struct sk_buff *skb)
 	if (err < 0)
 		goto err_free_skb;
 
-	if (hdr->evt == HCI_EV_VENDOR) {
+	if (hdr->evt == HCI_EV_WMT) {
 		if (test_and_clear_bit(BTMTKSDIO_TX_WAIT_VND_EVT,
 				       &bdev->tx_state)) {
 			/* Barrier to sync with other CPUs */

drivers/bluetooth/btusb.c

@@ -2256,7 +2256,6 @@ static void btusb_mtk_wmt_recv(struct urb *urb)
 {
 	struct hci_dev *hdev = urb->context;
 	struct btusb_data *data = hci_get_drvdata(hdev);
-	struct hci_event_hdr *hdr;
 	struct sk_buff *skb;
 	int err;
 
@@ -2276,13 +2275,6 @@ static void btusb_mtk_wmt_recv(struct urb *urb)
 		hci_skb_pkt_type(skb) = HCI_EVENT_PKT;
 		skb_put_data(skb, urb->transfer_buffer, urb->actual_length);
 
-		hdr = (void *)skb->data;
-		/* Fix up the vendor event id with 0xff for vendor specific
-		 * instead of 0xe4 so that event send via monitoring socket can
-		 * be parsed properly.
-		 */
-		hdr->evt = 0xff;
-
 		/* When someone waits for the WMT event, the skb is being cloned
 		 * and being processed the events from there then.
 		 */