+static u64 dpcm_runtime_base_format(struct snd_pcm_substream *substream)
+{
+ struct snd_soc_pcm_runtime *fe = substream->private_data;
+ struct snd_soc_dpcm *dpcm;
+ u64 formats = ULLONG_MAX;
+ int stream = substream->stream;
+
+ if (!fe->dai_link->dpcm_merged_format)
+ return formats;
+
+ /*
+ * It returns merged BE codec format
+ * if FE want to use it (= dpcm_merged_format)
+ */
+
+ list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
+ struct snd_soc_pcm_runtime *be = dpcm->be;
+ struct snd_soc_dai_driver *codec_dai_drv;
+ struct snd_soc_pcm_stream *codec_stream;
+ int i;
+
+ for (i = 0; i < be->num_codecs; i++) {
+ codec_dai_drv = be->codec_dais[i]->driver;
+ if (stream == SNDRV_PCM_STREAM_PLAYBACK)
+ codec_stream = &codec_dai_drv->playback;
+ else
+ codec_stream = &codec_dai_drv->capture;
+
+ formats &= codec_stream->formats;
+ }
+ }
+
+ return formats;
+}
+