Bluetooth: Fix auto PHY update on connection

Since the PHY update complete event can be generated due to the
procedure being initiated by the peer, use a flag to
differentiate between local auto update initiated on connection
complete versus peer initiated anytime in the connection. This
is necessary to avoid repeated initiation of auto-update
procedures intended only to be issued on connection complete.

Signed-off-by: Vinayak Kariappa Chettimada <vich@nordicsemi.no>

subsys/bluetooth/host/conn_internal.h

@@ -24,6 +24,7 @@ enum {
 	BT_CONN_BR_NOBOND,		/* SSP no bond pairing tracker */
 	BT_CONN_BR_PAIRING_INITIATOR,	/* local host starts authentication */
 	BT_CONN_CLEANUP,                /* Disconnected, pending cleanup */
+	BT_CONN_AUTO_PHY_UPDATE,        /* Auto-update PHY */
 
 	/* Total number of flags - must be at the end of the enum */
 	BT_CONN_NUM_FLAGS,

subsys/bluetooth/host/hci_core.c

@@ -802,10 +802,10 @@ static void le_conn_complete(struct net_buf *buf)
 		}
 	}
 
-	if (BT_FEAT_LE_PHY_2M(bt_dev.le.features) ||
-	    BT_FEAT_LE_PHY_CODED(bt_dev.le.features)) {
+	if (BT_FEAT_LE_PHY_2M(bt_dev.le.features)) {
 		err = hci_le_set_phy(conn);
 		if (!err) {
+			atomic_set_bit(conn->flags, BT_CONN_AUTO_PHY_UPDATE);
 			goto done;
 		}
 	}
@@ -834,12 +834,13 @@ static void le_remote_feat_complete(struct net_buf *buf)
 		       sizeof(conn->le.features));
 	}
 
-	if (BT_FEAT_LE_PHY_2M(bt_dev.le.features) ||
-	    BT_FEAT_LE_PHY_CODED(bt_dev.le.features)) {
+	if (BT_FEAT_LE_PHY_2M(bt_dev.le.features) &&
+	    BT_FEAT_LE_PHY_2M(conn->le.features)) {
 		int err;
 
 		err = hci_le_set_phy(conn);
 		if (!err) {
+			atomic_set_bit(conn->flags, BT_CONN_AUTO_PHY_UPDATE);
 			goto done;
 		}
 	}
@@ -864,8 +865,13 @@ static void le_phy_update_complete(struct net_buf *buf)
 	BT_DBG("PHY updated: status: 0x%x, tx: %u, rx: %u",
 	       evt->status, evt->tx_phy, evt->rx_phy);
 
+	if (!atomic_test_and_clear_bit(conn->flags, BT_CONN_AUTO_PHY_UPDATE)) {
+		goto done;
+	}
+
 	update_conn_param(conn);
 
+done:
 	bt_conn_unref(conn);
 }