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From:   Luiz Augusto von Dentz <luiz.dentz@gmail.com>
To:     linux-bluetooth@vger.kernel.org
Subject: [PATCH v4 1/4] Bluetooth: HCI: Add HCI_QUIRK_BROKEN_ENHANCED_SETUP_SYNC_CONN quirk
Date:   Fri,  1 Apr 2022 16:38:23 -0700
Message-Id: <20220401233826.122544-1-luiz.dentz@gmail.com>
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From: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

This adds HCI_QUIRK_BROKEN_ENHANCED_SETUP_SYNC_CONN quirk which can be
used to mark HCI_Enhanced_Setup_Synchronous_Connection as broken even
if its support command bit are set since some controller report it as
supported but the command don't work properly with some configurations
(e.g. BT_VOICE_TRANSPARENT/mSBC).

Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
---
v4: Address latest comments, add patch 4/4 spliting hci_dev_open_sync so each
stage can be handled by its own function.
v3: Make HCI_QUIRK_BROKEN macro expand quirk name and address other comments
from v2.
v2: Change hci_broken/hci_quirk_broken and HCI_BROKEN/HCI_QUIRK_BROKEN and add
patch 3/3 setting HCI_QUIRK_BROKEN_ENHANCED_SETUP_SYNC_CONN for QCA
controllers.

 include/net/bluetooth/hci.h      | 9 +++++++++
 include/net/bluetooth/hci_core.h | 8 ++++++--
 net/bluetooth/hci_conn.c         | 2 +-
 net/bluetooth/sco.c              | 2 +-
 4 files changed, 17 insertions(+), 4 deletions(-)

diff --git a/include/net/bluetooth/hci.h b/include/net/bluetooth/hci.h
index 5cb095b09a94..8bb81ea4d286 100644
--- a/include/net/bluetooth/hci.h
+++ b/include/net/bluetooth/hci.h
@@ -265,6 +265,15 @@ enum {
 	 * runtime suspend, because event filtering takes place there.
 	 */
 	HCI_QUIRK_BROKEN_FILTER_CLEAR_ALL,
+
+	/*
+	 * When this quirk is set, disables the use of
+	 * HCI_OP_ENHANCED_SETUP_SYNC_CONN command to setup SCO connections.
+	 *
+	 * This quirk can be set before hci_register_dev is called or
+	 * during the hdev->setup vendor callback.
+	 */
+	HCI_QUIRK_BROKEN_ENHANCED_SETUP_SYNC_CONN,
 };
 
 /* HCI device flags */
diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h
index d5377740e99c..59815df1272a 100644
--- a/include/net/bluetooth/hci_core.h
+++ b/include/net/bluetooth/hci_core.h
@@ -1492,8 +1492,12 @@ void hci_conn_del_sysfs(struct hci_conn *conn);
 #define privacy_mode_capable(dev) (use_ll_privacy(dev) && \
 				   (hdev->commands[39] & 0x04))
 
-/* Use enhanced synchronous connection if command is supported */
-#define enhanced_sco_capable(dev) ((dev)->commands[29] & 0x08)
+/* Use enhanced synchronous connection if command is supported and its quirk
+ * has not been set.
+ */
+#define enhanced_sync_conn_capable(dev) \
+	(((dev)->commands[29] & 0x08) && \
+	 !test_bit(HCI_QUIRK_BROKEN_ENHANCED_SETUP_SYNC_CONN, &(dev)->quirks))
 
 /* Use ext scanning if set ext scan param and ext scan enable is supported */
 #define use_ext_scan(dev) (((dev)->commands[37] & 0x20) && \
diff --git a/net/bluetooth/hci_conn.c b/net/bluetooth/hci_conn.c
index 84312c836549..cd51bf2a709b 100644
--- a/net/bluetooth/hci_conn.c
+++ b/net/bluetooth/hci_conn.c
@@ -481,7 +481,7 @@ static bool hci_setup_sync_conn(struct hci_conn *conn, __u16 handle)
 
 bool hci_setup_sync(struct hci_conn *conn, __u16 handle)
 {
-	if (enhanced_sco_capable(conn->hdev))
+	if (enhanced_sync_conn_capable(conn->hdev))
 		return hci_enhanced_setup_sync_conn(conn, handle);
 
 	return hci_setup_sync_conn(conn, handle);
diff --git a/net/bluetooth/sco.c b/net/bluetooth/sco.c
index 8eabf41b2993..2a58c7d88433 100644
--- a/net/bluetooth/sco.c
+++ b/net/bluetooth/sco.c
@@ -885,7 +885,7 @@ static int sco_sock_setsockopt(struct socket *sock, int level, int optname,
 			err = -EBADFD;
 			break;
 		}
-		if (enhanced_sco_capable(hdev) &&
+		if (enhanced_sync_conn_capable(hdev) &&
 		    voice.setting == BT_VOICE_TRANSPARENT)
 			sco_pi(sk)->codec.id = BT_CODEC_TRANSPARENT;
 		hci_dev_put(hdev);
-- 
2.35.1