Bluetooth: Add quirk to disable MWS Transport Configuration

Broadcom 4378/4387 controllers found in Apple Silicon Macs claim to
support getting MWS Transport Layer Configuration,

< HCI Command: Read Local Supported... (0x04|0x0002) plen 0
> HCI Event: Command Complete (0x0e) plen 68
      Read Local Supported Commands (0x04|0x0002) ncmd 1
        Status: Success (0x00)
[...]
          Get MWS Transport Layer Configuration (Octet 30 - Bit 3)]
[...]

, but then don't actually allow the required command:

> HCI Event: Command Complete (0x0e) plen 15
      Get MWS Transport Layer Configuration (0x05|0x000c) ncmd 1
        Status: Command Disallowed (0x0c)
        Number of transports: 0
        Baud rate list: 0 entries
        00 00 00 00 00 00 00 00 00 00
Signed-off-by: Sven Peter <sven@svenpeter.dev>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

include/net/bluetooth/hci.h

@@ -284,6 +284,16 @@ enum {
 	 * during the hdev->setup vendor callback.
 	 */
 	HCI_QUIRK_BROKEN_EXT_SCAN,
+
+	/*
+	 * When this quirk is set, the HCI_OP_GET_MWS_TRANSPORT_CONFIG command is
+	 * disabled. This is required for some Broadcom controllers which
+	 * erroneously claim to support MWS Transport Layer Configuration.
+	 *
+	 * This quirk can be set before hci_register_dev is called or
+	 * during the hdev->setup vendor callback.
+	 */
+	HCI_QUIRK_BROKEN_MWS_TRANSPORT_CONFIG,
 };
 
 /* HCI device flags */

include/net/bluetooth/hci_core.h

@@ -1720,6 +1720,9 @@ void hci_conn_del_sysfs(struct hci_conn *conn);
 	((dev)->le_features[3] & HCI_LE_CIS_PERIPHERAL)
 #define bis_capable(dev) ((dev)->le_features[3] & HCI_LE_ISO_BROADCASTER)
 
+#define mws_transport_config_capable(dev) (((dev)->commands[30] & 0x08) && \
+	(!test_bit(HCI_QUIRK_BROKEN_MWS_TRANSPORT_CONFIG, &(dev)->quirks)))
+
 /* ----- HCI protocols ----- */
 #define HCI_PROTO_DEFER             0x01
 

net/bluetooth/hci_sync.c

@@ -4279,7 +4279,7 @@ static int hci_read_local_pairing_opts_sync(struct hci_dev *hdev)
 /* Get MWS transport configuration if the HCI command is supported */
 static int hci_get_mws_transport_config_sync(struct hci_dev *hdev)
 {
-	if (!(hdev->commands[30] & 0x08))
+	if (!mws_transport_config_capable(hdev))
 		return 0;
 
 	return __hci_cmd_sync_status(hdev, HCI_OP_GET_MWS_TRANSPORT_CONFIG,