ASoC: soc-dai: add snd_soc_dai_suspend()

Current ALSA SoC is directly using dai->driver->xxx,
thus, it has deep nested bracket, and it makes code unreadable.
This patch adds new snd_soc_dai_suspend() and use it.
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://lore.kernel.org/r/87muh6hn2x.wl-kuninori.morimoto.gx@renesas.comSigned-off-by: Mark Brown <broonie@kernel.org>

include/sound/soc-dai.h

@@ -162,6 +162,7 @@ int snd_soc_dai_bespoke_trigger(struct snd_soc_dai *dai,
 			struct snd_pcm_substream *substream, int cmd);
 snd_pcm_sframes_t snd_soc_dai_delay(struct snd_soc_dai *dai,
 				    struct snd_pcm_substream *substream);
+void snd_soc_dai_suspend(struct snd_soc_dai *dai);
 
 struct snd_soc_dai_ops {
 	/*

sound/soc/soc-core.c

@@ -511,8 +511,8 @@ int snd_soc_suspend(struct device *dev)
 		if (rtd->dai_link->ignore_suspend)
 			continue;
 
-		if (cpu_dai->driver->suspend && !cpu_dai->driver->bus_control)
-			cpu_dai->driver->suspend(cpu_dai);
+		if (!cpu_dai->driver->bus_control)
+			snd_soc_dai_suspend(cpu_dai);
 	}
 
 	/* close any waiting streams */
@@ -584,8 +584,8 @@ int snd_soc_suspend(struct device *dev)
 		if (rtd->dai_link->ignore_suspend)
 			continue;
 
-		if (cpu_dai->driver->suspend && cpu_dai->driver->bus_control)
-			cpu_dai->driver->suspend(cpu_dai);
+		if (cpu_dai->driver->bus_control)
+			snd_soc_dai_suspend(cpu_dai);
 
 		/* deactivate pins to sleep state */
 		pinctrl_pm_select_sleep_state(cpu_dai->dev);

sound/soc/soc-dai.c

@@ -353,3 +353,9 @@ snd_pcm_sframes_t snd_soc_dai_delay(struct snd_soc_dai *dai,
 
 	return delay;
 }
+
+void snd_soc_dai_suspend(struct snd_soc_dai *dai)
+{
+	if (dai->driver->suspend)
+		dai->driver->suspend(dai);
+}