linux-kernel - [PATCH AUTOSEL 6.1 85/85] Bluetooth: Add quirk to disable MWS Transport Configuration

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Message-Id: <20221218160142.925394-85-sashal@kernel.org>
Date:   Sun, 18 Dec 2022 11:01:42 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Sven Peter <sven@...npeter.dev>,
        Luiz Augusto von Dentz <luiz.von.dentz@...el.com>,
        Sasha Levin <sashal@...nel.org>, marcel@...tmann.org,
        johan.hedberg@...il.com, luiz.dentz@...il.com, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
        linux-bluetooth@...r.kernel.org, netdev@...r.kernel.org
Subject: [PATCH AUTOSEL 6.1 85/85] Bluetooth: Add quirk to disable MWS Transport Configuration

From: Sven Peter <sven@...npeter.dev>

[ Upstream commit ffcb0a445ec2d5753751437706aa0a7ea8351099 ]

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@...npeter.dev>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@...el.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 include/net/bluetooth/hci.h      | 10 ++++++++++
 include/net/bluetooth/hci_core.h |  3 +++
 net/bluetooth/hci_sync.c         |  2 +-
 3 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/include/net/bluetooth/hci.h b/include/net/bluetooth/hci.h
index d8abeac2fc1e..7a381fcef939 100644
--- a/include/net/bluetooth/hci.h
+++ b/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 */
diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h
index 3cd00be0fcd2..7f585e5dd71b 100644
--- a/include/net/bluetooth/hci_core.h
+++ b/include/net/bluetooth/hci_core.h
@@ -1719,6 +1719,9 @@ 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
 
diff --git a/net/bluetooth/hci_sync.c b/net/bluetooth/hci_sync.c
index 1fc693122a47..3a68d9bc43b8 100644
--- a/net/bluetooth/hci_sync.c
+++ b/net/bluetooth/hci_sync.c
@@ -4261,7 +4261,7 @@ 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,
-- 
2.35.1