ASoC: soc-dai: update snd_soc_dai_delay() to snd_soc_pcm_dai_delay()

Current soc_pcm_pointer() is manually calculating
both CPU-DAI's   max delay (= A)
and  Codec-DAI's max delay (= B).

	static snd_pcm_uframes_t soc_pcm_pointer(...)
	{
		...
 ^		for_each_rtd_cpu_dais(rtd, i, cpu_dai)
(A)			cpu_delay = max(cpu_delay, ...);
 v		delay += cpu_delay;

 ^		for_each_rtd_codec_dais(rtd, i, codec_dai)
(B)			codec_delay = max(codec_delay, ...);
 v		delay += codec_delay;

		runtime->delay = delay;
		...
	}

Current soc_pcm_pointer() and the total delay calculating
is not readable / difficult to understand.

This patch update snd_soc_dai_delay() to snd_soc_pcm_dai_delay(),
and calcule both CPU/Codec delay in one function.

Link: https://lore.kernel.org/r/87fszl4yrq.wl-kuninori.morimoto.gx@renesas.com
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://lore.kernel.org/r/875yssy25z.wl-kuninori.morimoto.gx@renesas.com
Signed-off-by: Mark Brown <broonie@kernel.org>

include/sound/soc-dai.h

@@ -208,8 +208,6 @@ int snd_soc_dai_startup(struct snd_soc_dai *dai,
 			struct snd_pcm_substream *substream);
 void snd_soc_dai_shutdown(struct snd_soc_dai *dai,
 			  struct snd_pcm_substream *substream, int rollback);
-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);
 void snd_soc_dai_resume(struct snd_soc_dai *dai);
 int snd_soc_dai_compress_new(struct snd_soc_dai *dai,
@@ -238,6 +236,8 @@ int snd_soc_pcm_dai_trigger(struct snd_pcm_substream *substream, int cmd,
 			    int rollback);
 int snd_soc_pcm_dai_bespoke_trigger(struct snd_pcm_substream *substream,
 				    int cmd);
+void snd_soc_pcm_dai_delay(struct snd_pcm_substream *substream,
+			   snd_pcm_sframes_t *cpu_delay, snd_pcm_sframes_t *codec_delay);
 
 int snd_soc_dai_compr_startup(struct snd_soc_dai *dai,
 			      struct snd_compr_stream *cstream);

sound/soc/soc-dai.c

@@ -453,18 +453,6 @@ void snd_soc_dai_shutdown(struct snd_soc_dai *dai,
 	soc_dai_mark_pop(dai, substream, startup);
 }
 
-snd_pcm_sframes_t snd_soc_dai_delay(struct snd_soc_dai *dai,
-				    struct snd_pcm_substream *substream)
-{
-	int delay = 0;
-
-	if (dai->driver->ops &&
-	    dai->driver->ops->delay)
-		delay = dai->driver->ops->delay(substream, dai);
-
-	return delay;
-}
-
 int snd_soc_dai_compress_new(struct snd_soc_dai *dai,
 			     struct snd_soc_pcm_runtime *rtd, int num)
 {
@@ -693,6 +681,34 @@ int snd_soc_pcm_dai_bespoke_trigger(struct snd_pcm_substream *substream,
 	return 0;
 }
 
+void snd_soc_pcm_dai_delay(struct snd_pcm_substream *substream,
+			   snd_pcm_sframes_t *cpu_delay,
+			   snd_pcm_sframes_t *codec_delay)
+{
+	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
+	struct snd_soc_dai *dai;
+	int i;
+
+	/*
+	 * We're looking for the delay through the full audio path so it needs to
+	 * be the maximum of the DAIs doing transmit and the maximum of the DAIs
+	 * doing receive (ie, all CPUs and all CODECs) rather than just the maximum
+	 * of all DAIs.
+	 */
+
+	/* for CPU */
+	for_each_rtd_cpu_dais(rtd, i, dai)
+		if (dai->driver->ops &&
+		    dai->driver->ops->delay)
+			*cpu_delay = max(*cpu_delay, dai->driver->ops->delay(substream, dai));
+
+	/* for Codec */
+	for_each_rtd_codec_dais(rtd, i, dai)
+		if (dai->driver->ops &&
+		    dai->driver->ops->delay)
+			*codec_delay = max(*codec_delay, dai->driver->ops->delay(substream, dai));
+}
+
 int snd_soc_dai_compr_startup(struct snd_soc_dai *dai,
 			      struct snd_compr_stream *cstream)
 {

sound/soc/soc-pcm.c

@@ -1084,15 +1084,11 @@ start_err:
  */
 static snd_pcm_uframes_t soc_pcm_pointer(struct snd_pcm_substream *substream)
 {
-	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
-	struct snd_soc_dai *cpu_dai;
-	struct snd_soc_dai *codec_dai;
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	snd_pcm_uframes_t offset = 0;
 	snd_pcm_sframes_t delay = 0;
 	snd_pcm_sframes_t codec_delay = 0;
 	snd_pcm_sframes_t cpu_delay = 0;
-	int i;
 
 	/* clearing the previous total delay */
 	runtime->delay = 0;
@@ -1102,19 +1098,9 @@ static snd_pcm_uframes_t soc_pcm_pointer(struct snd_pcm_substream *substream)
 	/* base delay if assigned in pointer callback */
 	delay = runtime->delay;
 
-	for_each_rtd_cpu_dais(rtd, i, cpu_dai) {
+	snd_soc_pcm_dai_delay(substream, &cpu_delay, &codec_delay);
-		cpu_delay = max(cpu_delay,
-				snd_soc_dai_delay(cpu_dai, substream));
-	}
-	delay += cpu_delay;
 
-	for_each_rtd_codec_dais(rtd, i, codec_dai) {
+	runtime->delay = delay + cpu_delay + codec_delay;
-		codec_delay = max(codec_delay,
-				  snd_soc_dai_delay(codec_dai, substream));
-	}
-	delay += codec_delay;
-
-	runtime->delay = delay;
 
 	return offset;
 }