ASoC:SOF:get spcm from FE dai link during BE dai link prepare

BE dai link prepare() needs to setup hw_params again only
if the internal flag (hw_params_upon_resume) is set
for the pcm stream.

But since BE dai links themselves don't have a pcm, we need
to use the FE dai link that is connected to the BE dai link
to check for the flag.

Signed-off-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Signed-off-by: Rander Wang <rander.wang@linux.intel.com>

Author: RanderWang

sound/soc/sof/intel/hda-dai.c

@@ -169,19 +169,25 @@ static int hda_link_pcm_prepare(struct snd_pcm_substream *substream,
 				struct snd_soc_dai *dai)
 {
 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_soc_dpcm *dpcm;
 	struct snd_sof_dev *sdev =
 		snd_soc_component_get_drvdata(dai->component);
 	struct snd_sof_pcm *spcm;
 	int stream = substream->stream;
 
-	spcm = snd_sof_find_spcm_dai(sdev, rtd);
-	if (!spcm)
-		return -EINVAL;
+	for_each_dpcm_fe(rtd, stream, dpcm) {
+		spcm = snd_sof_find_spcm_dai(sdev, dpcm->fe);
+		if (!spcm)
+			return -EINVAL;
 
-	/* setup hw_params again only if resuming from system suspend */
-	if (!spcm->hw_params_upon_resume[stream])
-		return 0;
+		/* setup hw_params only if resuming from system suspend */
+		if (spcm->hw_params_upon_resume[stream])
+			goto params;
+	}
+
+	return 0;
 
+params:
 	dev_dbg(sdev->dev, "hda: prepare stream %d dir %d\n",
 		spcm->pcm.pcm_id, substream->stream);