diff --git a/amp/src/service/sound/src/sound_hdmi_mgr.c b/amp/src/service/sound/src/sound_hdmi_mgr.c
index 55051b2..54f3fbd 100755
--- a/amp/src/service/sound/src/sound_hdmi_mgr.c
+++ b/amp/src/service/sound/src/sound_hdmi_mgr.c
@@ -791,6 +791,16 @@ HRESULT snd_hdmi_mgr_set_format(SOUND_MANAGER *pSndMgr, UINT32 Format, BOOL bPlu
             pSndMgr->uiLastSetupPortIdx,
             pSndMgr->UserHdmiFmt, pSndMgr->RealHdmiFmt, Format, bPlug);
 
+    /* when user prefer format is RAW_MAIN,
+            real format and wish format is identical, do nothing */
+    if( AMP_SND_HDMI_FORMAT_RAW_MAIN == Format ){
+        if( (pSndMgr->UserHdmiFmt==pSndMgr->RealHdmiFmt) && (pSndMgr->UserHdmiFmt==Format) ){
+            SNDLOGE("Ignore the request when all cases are identical");
+            return SUCCESS;
+        }
+    }
+
+
     AmpMemClear(&stHdmiDataCfg, sizeof(HDMI_DATA_CFG));
     AmpMemClear(&stCapHdmiDataCfg, sizeof(HDMI_DATA_CFG));