bluetooth: bap_unicast_client: fix PTS BAP/UCL/SCC/BV-103-C failure

- In bap_unicast_client, it was assumed that ASE is binded with CIS
 handler during sending "received_stop_ready" to unicast_server.
- In case where unicast_client has not started the stream with
 "receiver_start_ready" att command to server, but wants to disable
 ASE which was Enabled previously (but not stream!) causes failure
 since there is no cis_create has happened and linked to ASE.
- In BAP_TS, "BAP/UCL/SCC/BV-103-C" has a same test conditions where
 client first enables the ASE, disable the ASE, and expecting
 "receiver_stop_ready" att command from client to server followed by
 server notification to enter its ASE in QoS_configured state.
- Removed this condition checks to send expected att command to
 server from Enabling ASE state to Disable ASE.

Signed-off-by: Nirav Agrawal <[email protected]>

Author: nirav-agrawal

subsys/bluetooth/audio/bap_stream.c

@@ -483,10 +483,11 @@ bool bt_bap_stream_can_disconnect(const struct bt_bap_stream *stream)
 
 		pair_ep = bt_bap_iso_get_paired_ep(stream_ep);
 
-		/* If there are no paired endpoint, or the paired endpoint is
-		 * not in the streaming state, we can disconnect the CIS
+		/* If there are no paired endpoint, or the paired endpoint is in the QoS Configured
+		 * or Codec Configured state, we can disconnect the CIS
 		 */
-		if (pair_ep == NULL || pair_ep->status.state != BT_BAP_EP_STATE_STREAMING) {
+		if (pair_ep == NULL || pair_ep->status.state == BT_BAP_EP_STATE_QOS_CONFIGURED ||
+			pair_ep->status.state == BT_BAP_EP_STATE_CODEC_CONFIGURED) {
 			return true;
 		}
 	}

subsys/bluetooth/audio/bap_unicast_client.c

@@ -5,6 +5,7 @@
 /*
  * Copyright (c) 2020 Intel Corporation
  * Copyright (c) 2022-2025 Nordic Semiconductor ASA
+ * Copyright 2025 NXP
  *
  * SPDX-License-Identifier: Apache-2.0
  */
@@ -3517,7 +3518,6 @@ int bt_bap_unicast_client_disable(struct bt_bap_stream *stream)
 int bt_bap_unicast_client_stop(struct bt_bap_stream *stream)
 {
 	struct bt_bap_ep *ep = stream->ep;
-	enum bt_iso_state iso_state;
 	struct net_buf_simple *buf;
 	struct bt_ascs_start_op *req;
 	int err;
@@ -3530,27 +3530,6 @@ int bt_bap_unicast_client_stop(struct bt_bap_stream *stream)
 		return -ENOTCONN;
 	}
 
-	/* ASCS_v1.0 3.2 ASE state machine transitions
-	 *
-	 * If the server detects link loss of a CIS for an ASE in the Streaming state or the
-	 * Disabling state, the server shall immediately transition that ASE to the QoS Configured
-	 * state.
-	 *
-	 * This effectively means that if an ASE no longer has a connected CIS, the server shall
-	 * bring it to the QoS Configured state. That means that we, as a unicast client, should not
-	 * attempt to stop it
-	 */
-	if (ep->iso == NULL) {
-		LOG_DBG("Stream endpoint does not have a CIS, server will stop the ASE");
-		return -EALREADY;
-	}
-
-	iso_state = ep->iso->chan.state;
-	if (iso_state != BT_ISO_STATE_CONNECTED && iso_state != BT_ISO_STATE_CONNECTING) {
-		LOG_DBG("Stream endpoint CIS is not connected, server will stop the ASE");
-		return -EALREADY;
-	}
-
 	buf = bt_bap_unicast_client_ep_create_pdu(stream->conn, BT_ASCS_STOP_OP);
 	if (buf == NULL) {
 		LOG_DBG("Could not create PDU");

subsys/bluetooth/audio/cap_initiator.c

@@ -1,5 +1,6 @@
 /*
  * Copyright (c) 2022-2025 Nordic Semiconductor ASA
+ * Copyright 2025 NXP
  *
  * SPDX-License-Identifier: Apache-2.0
  */
@@ -2389,13 +2390,11 @@ void bt_cap_initiator_disabled(struct bt_cap_stream *cap_stream)
 		proc_param->in_progress = true;
 
 		err = bt_bap_stream_stop(next_bap_stream);
-		if (err != 0 && err != -EALREADY) {
+		if (err != 0) {
 			LOG_DBG("Failed to stop stream %p: %d", next_cap_stream, err);
 
 			bt_cap_common_abort_proc(next_bap_stream->conn, err);
 			cap_initiator_unicast_audio_proc_complete();
-		} else if (err == -EALREADY) {
-			proc_param->in_progress = false;
 		} /* else wait for server notification*/
 	}
 }
@@ -2449,13 +2448,11 @@ void bt_cap_initiator_stopped(struct bt_cap_stream *cap_stream)
 			proc_param->in_progress = true;
 
 			err = bt_bap_stream_stop(next_bap_stream);
-			if (err != 0 && err != -EALREADY) {
+			if (err != 0) {
 				LOG_DBG("Failed to stop stream %p: %d", next_cap_stream, err);
 
 				bt_cap_common_abort_proc(next_bap_stream->conn, err);
 				cap_initiator_unicast_audio_proc_complete();
-			} else if (err == -EALREADY) {
-				proc_param->in_progress = false;
 			}
 		} /* else await notification from server */
 	} else {