From: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Date: Wed, 22 Dec 2021 12:21:59 -0800
Subject: Bluetooth: hci_sync: Add check simultaneous roles support
Patch-mainline: v5.17-rc1
Git-commit: 4fc9857ab8c6cfe2152df3288c8cf3300b929f1a
References: jsc#PED-1407

This attempts to check if the controller can act as both central and
peripheral simultaneously and in case it does skip suspending
advertising or in case of directed advertising don't fail if scanning.

Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Acked-by: Lee, Chun-Yi <jlee@suse.com>
---
 include/net/bluetooth/hci_core.h |    6 ++++++
 net/bluetooth/hci_sync.c         |   24 ++++++++++++------------
 net/bluetooth/mgmt.c             |    5 +----
 3 files changed, 19 insertions(+), 16 deletions(-)

--- a/include/net/bluetooth/hci_core.h
+++ b/include/net/bluetooth/hci_core.h
@@ -783,6 +783,12 @@ extern struct mutex hci_cb_list_lock;
 		hci_dev_clear_flag(hdev, HCI_QUALITY_REPORT);	\
 	} while (0)
 
+#define hci_dev_le_state_simultaneous(hdev) \
+	(test_bit(HCI_QUIRK_VALID_LE_STATES, &hdev->quirks) && \
+	 (hdev->le_states[4] & 0x08) &&	/* Central */ \
+	 (hdev->le_states[4] & 0x40) &&	/* Peripheral */ \
+	 (hdev->le_states[3] & 0x10))	/* Simultaneous */
+
 /* ----- HCI interface to upper protocols ----- */
 int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr);
 int l2cap_disconn_ind(struct hci_conn *hcon);
--- a/net/bluetooth/hci_sync.c
+++ b/net/bluetooth/hci_sync.c
@@ -5195,30 +5195,29 @@ int hci_le_create_conn_sync(struct hci_d
 	u8 own_addr_type;
 	int err;
 
-	/* Disable advertising if we're active. For central role
-	 * connections most controllers will refuse to connect if
-	 * advertising is enabled, and for peripheral role connections we
-	 * anyway have to disable it in order to start directed
-	 * advertising. Any registered advertisements will be
-	 * re-enabled after the connection attempt is finished.
-	 */
-	hci_pause_advertising_sync(hdev);
-
 	/* If requested to connect as peripheral use directed advertising */
 	if (conn->role == HCI_ROLE_SLAVE) {
-		/* If we're active scanning most controllers are unable
-		 * to initiate advertising. Simply reject the attempt.
+		/* If we're active scanning and the controller doesn't support
+		 * simultaneous roles simply reject the attempt.
 		 */
 		if (hci_dev_test_flag(hdev, HCI_LE_SCAN) &&
-		    hdev->le_scan_type == LE_SCAN_ACTIVE) {
+		    hdev->le_scan_type == LE_SCAN_ACTIVE &&
+		    !hci_dev_le_state_simultaneous(hdev)) {
 			hci_conn_del(conn);
 			return -EBUSY;
 		}
 
+		/* Pause advertising while doing directed advertising. */
+		hci_pause_advertising_sync(hdev);
+
 		err = hci_le_directed_advertising_sync(hdev, conn);
 		goto done;
 	}
 
+	/* Disable advertising if simultaneous roles is not supported. */
+	if (!hci_dev_le_state_simultaneous(hdev))
+		hci_pause_advertising_sync(hdev);
+
 	params = hci_conn_params_lookup(hdev, &conn->dst, conn->dst_type);
 	if (params) {
 		conn->le_conn_min_interval = params->conn_min_interval;
@@ -5276,6 +5275,7 @@ int hci_le_create_conn_sync(struct hci_d
 				       HCI_CMD_TIMEOUT, NULL);
 
 done:
+	/* Re-enable advertising after the connection attempt is finished. */
 	hci_resume_advertising_sync(hdev);
 	return err;
 }
--- a/net/bluetooth/mgmt.c
+++ b/net/bluetooth/mgmt.c
@@ -3916,10 +3916,7 @@ static int read_exp_features_info(struct
 #endif
 
 	if (hdev) {
-		if (test_bit(HCI_QUIRK_VALID_LE_STATES, &hdev->quirks) &&
-		    (hdev->le_states[4] & 0x08) &&	/* Central */
-		    (hdev->le_states[4] & 0x40) &&	/* Peripheral */
-		    (hdev->le_states[3] & 0x10))	/* Simultaneous */
+		if (hci_dev_le_state_simultaneous(hdev))
 			flags = BIT(0);
 		else
 			flags = 0;