[PATCH v3 6/7] Bluetooth: Add quirk to disable MWS Transport Configuration

[Sven Peter]

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 at svenpeter.dev>
---
new commit in v3 since this now fails loudly since 6.0-rc4

 include/net/bluetooth/hci.h | 10 ++++++++++
 net/bluetooth/hci_sync.c    |  2 ++
 2 files changed, 12 insertions(+)

diff --git a/include/net/bluetooth/hci.h b/include/net/bluetooth/hci.h
index 75dcd818cf04..33d83d5ab84b 100644
--- a/include/net/bluetooth/hci.h
+++ b/include/net/bluetooth/hci.h
@@ -273,6 +273,16 @@ 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 */
diff --git a/net/bluetooth/hci_sync.c b/net/bluetooth/hci_sync.c
index fbd5613eebfc..791b37344ed6 100644
--- a/net/bluetooth/hci_sync.c
+++ b/net/bluetooth/hci_sync.c
@@ -3939,6 +3939,8 @@ static int hci_get_mws_transport_config_sync(struct hci_dev *hdev)
 {
 	if (!(hdev->commands[30] & 0x08))
 		return 0;
+	if (test_bit(HCI_QUIRK_BROKEN_MWS_TRANSPORT_CONFIG, &hdev->quirks))
+		return 0;
 
 	return __hci_cmd_sync_status(hdev, HCI_OP_GET_MWS_TRANSPORT_CONFIG,
 				     0, NULL, HCI_CMD_TIMEOUT);
-- 
2.25.1