ASoC: soc-dai: add snd_soc_dai_startup()

Current ALSA SoC is directly using dai->driver->ops->xxx,
thus, it has deep nested bracket, and it makes code unreadable.
This patch adds new snd_soc_dai_startup() and use it.
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://lore.kernel.org/r/87wogahn4i.wl-kuninori.morimoto.gx@renesas.comSigned-off-by: Mark Brown <broonie@kernel.org>

include/sound/soc-dai.h

@@ -150,6 +150,8 @@ int snd_soc_dai_hw_params(struct snd_soc_dai *dai,
 			  struct snd_pcm_hw_params *params);
 void snd_soc_dai_hw_free(struct snd_soc_dai *dai,
 			 struct snd_pcm_substream *substream);
+int snd_soc_dai_startup(struct snd_soc_dai *dai,
+			struct snd_pcm_substream *substream);
 
 struct snd_soc_dai_ops {
 	/*

sound/soc/soc-dai.c

@@ -289,3 +289,14 @@ void snd_soc_dai_hw_free(struct snd_soc_dai *dai,
 	if (dai->driver->ops->hw_free)
 		dai->driver->ops->hw_free(substream, dai);
 }
+
+int snd_soc_dai_startup(struct snd_soc_dai *dai,
+			struct snd_pcm_substream *substream)
+{
+	int ret = 0;
+
+	if (dai->driver->ops->startup)
+		ret = dai->driver->ops->startup(substream, dai);
+
+	return ret;
+}

sound/soc/soc-dapm.c

@@ -3828,15 +3828,11 @@ static int snd_soc_dai_link_event(struct snd_soc_dapm_widget *w,
 		snd_soc_dapm_widget_for_each_source_path(w, path) {
 			source = path->source->priv;
 
-			if (source->driver->ops->startup) {
-				ret = source->driver->ops->startup(&substream,
-								   source);
-				if (ret < 0) {
-					dev_err(source->dev,
-						"ASoC: startup() failed: %d\n",
-						ret);
-					goto out;
-				}
+			ret = snd_soc_dai_startup(source, &substream);
+			if (ret < 0) {
+				dev_err(source->dev,
+					"ASoC: startup() failed: %d\n", ret);
+				goto out;
 			}
 			source->active++;
 			ret = snd_soc_dai_hw_params(source, &substream, params);
@@ -3850,15 +3846,11 @@ static int snd_soc_dai_link_event(struct snd_soc_dapm_widget *w,
 		snd_soc_dapm_widget_for_each_sink_path(w, path) {
 			sink = path->sink->priv;
 
-			if (sink->driver->ops->startup) {
-				ret = sink->driver->ops->startup(&substream,
-								 sink);
-				if (ret < 0) {
-					dev_err(sink->dev,
-						"ASoC: startup() failed: %d\n",
-						ret);
-					goto out;
-				}
+			ret = snd_soc_dai_startup(sink, &substream);
+			if (ret < 0) {
+				dev_err(sink->dev,
+					"ASoC: startup() failed: %d\n", ret);
+				goto out;
 			}
 			sink->active++;
 			ret = snd_soc_dai_hw_params(sink, &substream, params);

sound/soc/soc-pcm.c

@@ -535,13 +535,11 @@ static int soc_pcm_open(struct snd_pcm_substream *substream)
 	mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 
 	/* startup the audio subsystem */
-	if (cpu_dai->driver->ops->startup) {
-		ret = cpu_dai->driver->ops->startup(substream, cpu_dai);
-		if (ret < 0) {
-			dev_err(cpu_dai->dev, "ASoC: can't open interface"
-				" %s: %d\n", cpu_dai->name, ret);
-			goto out;
-		}
+	ret = snd_soc_dai_startup(cpu_dai, substream);
+	if (ret < 0) {
+		dev_err(cpu_dai->dev, "ASoC: can't open interface %s: %d\n",
+			cpu_dai->name, ret);
+		goto out;
 	}
 
 	ret = soc_pcm_components_open(substream, &component);
@@ -549,15 +547,12 @@ static int soc_pcm_open(struct snd_pcm_substream *substream)
 		goto component_err;
 
 	for_each_rtd_codec_dai(rtd, i, codec_dai) {
-		if (codec_dai->driver->ops->startup) {
-			ret = codec_dai->driver->ops->startup(substream,
-							      codec_dai);
-			if (ret < 0) {
-				dev_err(codec_dai->dev,
-					"ASoC: can't open codec %s: %d\n",
-					codec_dai->name, ret);
-				goto codec_dai_err;
-			}
+		ret = snd_soc_dai_startup(codec_dai, substream);
+		if (ret < 0) {
+			dev_err(codec_dai->dev,
+				"ASoC: can't open codec %s: %d\n",
+				codec_dai->name, ret);
+			goto codec_dai_err;
 		}
 
 		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)