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From: Luiz Augusto von Dentz <luiz.dentz@gmail.com>
To: linux-bluetooth@vger.kernel.org
Subject: [PATCH v4 2/2] Bluetooth: hci_sync: Use QoS to determine which PHY to scan
Date: Mon, 26 Feb 2024 17:00:31 -0500
Message-ID: <20240226220031.1686256-2-luiz.dentz@gmail.com>
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From: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

This used the hci_conn QoS to determine which PHY to scan when creating
a PA Sync.

Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
---
 net/bluetooth/hci_sync.c | 65 +++++++++++++++++++++++++++++++++-------
 1 file changed, 54 insertions(+), 11 deletions(-)

diff --git a/net/bluetooth/hci_sync.c b/net/bluetooth/hci_sync.c
index ab609089ac4c..2bd9b6b050e0 100644
--- a/net/bluetooth/hci_sync.c
+++ b/net/bluetooth/hci_sync.c
@@ -2758,6 +2758,14 @@ static u8 hci_update_accept_list_sync(struct hci_dev *hdev)
 	return filter_policy;
 }
 
+static void hci_le_scan_phy_params(struct hci_cp_le_scan_phy_params *cp,
+				   u8 type, u16 interval, u16 window)
+{
+	cp->type = type;
+	cp->interval = cpu_to_le16(interval);
+	cp->window = cpu_to_le16(window);
+}
+
 static int hci_le_set_ext_scan_param_sync(struct hci_dev *hdev, u8 type,
 					  u16 interval, u16 window,
 					  u8 own_addr_type, u8 filter_policy)
@@ -2765,7 +2773,7 @@ static int hci_le_set_ext_scan_param_sync(struct hci_dev *hdev, u8 type,
 	struct hci_cp_le_set_ext_scan_params *cp;
 	struct hci_cp_le_scan_phy_params *phy;
 	u8 data[sizeof(*cp) + sizeof(*phy) * 2];
-	u8 num_phy = 0;
+	u8 num_phy = 0x00;
 
 	cp = (void *)data;
 	phy = (void *)cp->data;
@@ -2775,28 +2783,63 @@ static int hci_le_set_ext_scan_param_sync(struct hci_dev *hdev, u8 type,
 	cp->own_addr_type = own_addr_type;
 	cp->filter_policy = filter_policy;
 
+	/* Check if PA Sync is in progress then select the PHY based on the
+	 * hci_conn.iso_qos.
+	 */
+	if (hci_dev_test_flag(hdev, HCI_PA_SYNC)) {
+		struct hci_cp_le_add_to_accept_list *sent;
+
+		sent = hci_sent_cmd_data(hdev, HCI_OP_LE_ADD_TO_ACCEPT_LIST);
+		if (sent) {
+			struct hci_conn *conn;
+
+			conn = hci_conn_hash_lookup_ba(hdev, ISO_LINK,
+						       &sent->bdaddr);
+			if (conn) {
+				struct bt_iso_qos *qos = &conn->iso_qos;
+
+				if (qos->bcast.in.phy & BT_ISO_PHY_1M ||
+				    qos->bcast.in.phy & BT_ISO_PHY_2M) {
+					cp->scanning_phys |= LE_SCAN_PHY_1M;
+					hci_le_scan_phy_params(phy, type,
+							       interval,
+							       window);
+					num_phy++;
+					phy++;
+				}
+
+				if (qos->bcast.in.phy & BT_ISO_PHY_CODED) {
+					cp->scanning_phys |= LE_SCAN_PHY_CODED;
+					hci_le_scan_phy_params(phy, type,
+							       interval,
+							       window);
+					num_phy++;
+					phy++;
+				}
+
+				goto done;
+			}
+		}
+	}
+
 	if (scan_1m(hdev) || scan_2m(hdev)) {
 		cp->scanning_phys |= LE_SCAN_PHY_1M;
-
-		phy->type = type;
-		phy->interval = cpu_to_le16(interval);
-		phy->window = cpu_to_le16(window);
-
+		hci_le_scan_phy_params(phy, type, interval, window);
 		num_phy++;
 		phy++;
 	}
 
 	if (scan_coded(hdev)) {
 		cp->scanning_phys |= LE_SCAN_PHY_CODED;
-
-		phy->type = type;
-		phy->interval = cpu_to_le16(interval);
-		phy->window = cpu_to_le16(window);
-
+		hci_le_scan_phy_params(phy, type, interval, window);
 		num_phy++;
 		phy++;
 	}
 
+done:
+	if (!num_phy)
+		return -EINVAL;
+
 	return __hci_cmd_sync_status(hdev, HCI_OP_LE_SET_EXT_SCAN_PARAMS,
 				     sizeof(*cp) + sizeof(*phy) * num_phy,
 				     data, HCI_CMD_TIMEOUT);
-- 
2.43.0