diff --git a/dsp/q6adm.c b/dsp/q6adm.c
index 51fee3443cfd..edba25fe66c8 100644
--- a/dsp/q6adm.c
+++ b/dsp/q6adm.c
@@ -2677,7 +2677,7 @@ static int adm_arrange_mch_ep2_map_v8(
 		ep_payload->dev_channel_mapping[6] = PCM_CHANNEL_LB;
 		ep_payload->dev_channel_mapping[7] = PCM_CHANNEL_RB;
 		ep_payload->dev_channel_mapping[8] = PCM_CHANNEL_CS;
-		ep_payload->dev_channel_mapping[9] = PCM_CHANNELS;
+		ep_payload->dev_channel_mapping[9] = PCM_CHANNEL_TS;
 	} else if (channel_mode == 12) {
 		ep_payload->dev_channel_mapping[0] = PCM_CHANNEL_FL;
 		ep_payload->dev_channel_mapping[1] = PCM_CHANNEL_FR;
@@ -2701,7 +2701,7 @@ static int adm_arrange_mch_ep2_map_v8(
 		ep_payload->dev_channel_mapping[6] = PCM_CHANNEL_LB;
 		ep_payload->dev_channel_mapping[7] = PCM_CHANNEL_RB;
 		ep_payload->dev_channel_mapping[8] = PCM_CHANNEL_CS;
-		ep_payload->dev_channel_mapping[9] = PCM_CHANNELS;
+		ep_payload->dev_channel_mapping[9] = PCM_CHANNEL_TS;
 		ep_payload->dev_channel_mapping[10] = PCM_CHANNEL_CVH;
 		ep_payload->dev_channel_mapping[11] = PCM_CHANNEL_MS;
 		ep_payload->dev_channel_mapping[12] = PCM_CHANNEL_FLC;
diff --git a/include/dsp/apr_audio-v2.h b/include/dsp/apr_audio-v2.h
index 1e643e42d9eb..8e75dbe173b0 100644
--- a/include/dsp/apr_audio-v2.h
+++ b/include/dsp/apr_audio-v2.h
@@ -5416,7 +5416,7 @@ struct asm_softvolume_params {
 #define PCM_CHANNEL_RB   9
 
 /* Top surround channel. */
-#define PCM_CHANNELS   10
+#define PCM_CHANNEL_TS   10
 
 /* Center vertical height channel.*/
 #define PCM_CHANNEL_CVH  11
@@ -5496,6 +5496,9 @@ struct asm_softvolume_params {
 /* Right side direct channel. */
 #define PCM_CHANNEL_RSD  34
 
+/* Mark unused channel. */
+#define PCM_CHANNEL_UNUSED  47
+
 #define PCM_FORMAT_MAX_NUM_CHANNEL  8
 #define PCM_FORMAT_MAX_CHANNELS_9   9
 
@@ -5625,7 +5628,7 @@ struct asm_multi_channel_pcm_fmt_blk_v2 {
  * - #PCM_CHANNEL_CS
  * - #PCM_CHANNEL_LB
  * - #PCM_CHANNEL_RB
- * - #PCM_CHANNELS
+ * - #PCM_CHANNEL_TS
  * - #PCM_CHANNEL_CVH
  * - #PCM_CHANNEL_MS
  * - #PCM_CHANNEL_FLC
@@ -9559,7 +9562,7 @@ struct asm_volume_ctrl_channeltype_gain_pair {
 	 * - #PCM_CHANNEL_CS
 	 * - #PCM_CHANNEL_LB
 	 * - #PCM_CHANNEL_RB
-	 * - #PCM_CHANNELS
+	 * - #PCM_CHANNEL_TS
 	 * - #PCM_CHANNEL_CVH
 	 * - #PCM_CHANNEL_MS
 	 * - #PCM_CHANNEL_FLC
@@ -9631,7 +9634,7 @@ struct asm_volume_ctrl_channelype_mute_pair {
  * - #PCM_CHANNEL_CS
  * - #PCM_CHANNEL_LB
  * - #PCM_CHANNEL_RB
- * - #PCM_CHANNELS
+ * - #PCM_CHANNEL_TS
  * - #PCM_CHANNEL_CVH
  * - #PCM_CHANNEL_MS
  * - #PCM_CHANNEL_FLC