ASoC: Add multiple CPU DAI support in DAPM

DAPM handles DAIs during soc_dapm_stream_event() and during addition
and creation of DAI widgets i.e., dapm_add_valid_dai_widget() and
dapm_connect_dai_link_widgets().

Extend these functions to handle multiple cpu dai.
Signed-off-by: NPierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: NBard Liao <yung-chuan.liao@linux.intel.com>
Signed-off-by: NKuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: NShreyas NC <shreyas.nc@intel.com>
Signed-off-by: NVinod Koul <vkoul@kernel.org>
Link: https://lore.kernel.org/r/20200225133917.21314-5-yung-chuan.liao@linux.intel.comSigned-off-by: NMark Brown <broonie@kernel.org>

sound/soc/soc-dapm.c

@@ -4361,9 +4361,19 @@ static void dapm_connect_dai_link_widgets(struct snd_soc_card *card,
 	struct snd_soc_dai *codec_dai;
 	int i;
 
-	for_each_rtd_codec_dai(rtd, i, codec_dai)
-		dapm_add_valid_dai_widget(card, rtd,
-					  codec_dai, rtd->cpu_dais[0]);
+	if (rtd->num_cpus == 1) {
+		for_each_rtd_codec_dai(rtd, i, codec_dai)
+			dapm_add_valid_dai_widget(card, rtd, codec_dai,
+						  rtd->cpu_dais[0]);
+	} else if (rtd->num_codecs == rtd->num_cpus) {
+		for_each_rtd_codec_dai(rtd, i, codec_dai)
+			dapm_add_valid_dai_widget(card, rtd, codec_dai,
+						  rtd->cpu_dais[i]);
+	} else {
+		dev_err(card->dev,
+			"N cpus to M codecs link is not supported yet\n");
+	}
+
 }
 
 static void soc_dapm_dai_stream_event(struct snd_soc_dai *dai, int stream,
@@ -4424,9 +4434,11 @@ static void soc_dapm_stream_event(struct snd_soc_pcm_runtime *rtd, int stream,
 	int event)
 {
 	struct snd_soc_dai *codec_dai;
+	struct snd_soc_dai *cpu_dai;
 	int i;
 
-	soc_dapm_dai_stream_event(rtd->cpu_dai, stream, event);
+	for_each_rtd_cpu_dai(rtd, i, cpu_dai)
+		soc_dapm_dai_stream_event(rtd->cpu_dai, stream, event);
 	for_each_rtd_codec_dai(rtd, i, codec_dai)
 		soc_dapm_dai_stream_event(codec_dai, stream, event);