Bluetooth: controller: adding API for unmasking peer features

For asymetrical features there needs to be a separate mechanism to
unmask features in peer. This must be used in central for unmasking in case
of 'unsupported in peer' condition for CIS Create.

Signed-off-by: Erik Brockhoff <[email protected]>

Author: erbr-ot

subsys/bluetooth/controller/ll_sw/ull_llcp_cc.c

@@ -921,14 +921,14 @@ static void lp_cc_st_wait_rx_cis_rsp(struct ll_conn *conn, struct proc_ctx *ctx,
 		break;
 	case LP_CC_EVT_UNKNOWN:
 		/* Unsupported in peer, so disable locally for this connection */
-		feature_unmask_features(conn, LL_FEAT_BIT_CIS_PERIPHERAL);
+		feature_unmask_peer_features(conn, LL_FEAT_BIT_CIS_PERIPHERAL);
 		ctx->data.cis_create.error = BT_HCI_ERR_UNSUPP_REMOTE_FEATURE;
 		lp_cc_complete(conn, ctx, evt, param);
 		break;
 	case LP_CC_EVT_REJECT:
 		if (pdu->llctrl.reject_ext_ind.error_code == BT_HCI_ERR_UNSUPP_REMOTE_FEATURE) {
 			/* Unsupported in peer, so disable locally for this connection */
-			feature_unmask_features(conn, LL_FEAT_BIT_CIS_PERIPHERAL);
+			feature_unmask_peer_features(conn, LL_FEAT_BIT_CIS_PERIPHERAL);
 		}
 		ctx->data.cis_create.error = pdu->llctrl.reject_ext_ind.error_code;
 		lp_cc_complete(conn, ctx, evt, param);

subsys/bluetooth/controller/ll_sw/ull_llcp_features.h

@@ -9,6 +9,11 @@ static inline void feature_unmask_features(struct ll_conn *conn, uint64_t ll_fea
 	conn->llcp.fex.features_used &= ~ll_feat_mask;
 }
 
+static inline void feature_unmask_peer_features(struct ll_conn *conn, uint64_t ll_feat_mask)
+{
+	conn->llcp.fex.features_peer &= ~ll_feat_mask;
+}
+
 static inline bool feature_le_encryption(struct ll_conn *conn)
 {
 #if defined(CONFIG_BT_CTLR_LE_ENC)