ASoC: soc-core: remove DAI suspend/resume

Historically, CPU and Codec were implemented different, but now it is
merged as Component.
ALSA SoC is supporting suspend/resume at DAI and Component level.
The method is like below.

	1) Suspend/Resume all CPU DAI if bus-control was 0
	2) Suspend/Resume all Component
	3) Suspend/Resume all CPU DAI if bus-control was 1

Historically 2) was Codec special operation.
Because CPU and Codec were merged into Component,
CPU   suspend/resume has 3 chance to suspend(= 1/2/3), but
Codec suspend/resume has 1 chance (= 2).

Here, DAI side suspend/resume is caring bus-control, but no driver
which is supporting suspend/resume is setting bus-control.
This means 3) was never used.

Here, used parameter for suspend/resume component->dev and dai->dev are
same pointer.
For that reason, we can merge DAI and Component suspend/resume.
One note is that we should use 2), because it is caring BIAS level.

This patch removes 1) and 3).

Signed-off-by: Kuninori Morimoto <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>

Author: morimoto

include/sound/soc-dai.h

@@ -286,8 +286,6 @@ struct snd_soc_dai_driver {
 	/* DAI driver callbacks */
 	int (*probe)(struct snd_soc_dai *dai);
 	int (*remove)(struct snd_soc_dai *dai);
-	int (*suspend)(struct snd_soc_dai *dai);
-	int (*resume)(struct snd_soc_dai *dai);
 	/* compress dai */
 	int (*compress_new)(struct snd_soc_pcm_runtime *rtd, int num);
 	/* Optional Callback used at pcm creation*/

sound/soc/soc-core.c

@@ -558,16 +558,6 @@ int snd_soc_suspend(struct device *dev)
 	if (card->suspend_pre)
 		card->suspend_pre(card);
 
-	for_each_card_rtds(card, rtd) {
-		struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
-
-		if (rtd->dai_link->ignore_suspend)
-			continue;
-
-		if (!cpu_dai->driver->bus_control)
-			snd_soc_dai_suspend(cpu_dai);
-	}
-
 	/* close any waiting streams */
 	snd_soc_flush_all_delayed_work(card);
 
@@ -639,16 +629,6 @@ int snd_soc_suspend(struct device *dev)
 		}
 	}
 
-	for_each_card_rtds(card, rtd) {
-		struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
-
-		if (rtd->dai_link->ignore_suspend)
-			continue;
-
-		if (cpu_dai->driver->bus_control)
-			snd_soc_dai_suspend(cpu_dai);
-	}
-
 	if (card->suspend_post)
 		card->suspend_post(card);
 
@@ -682,17 +662,6 @@ static void soc_resume_deferred(struct work_struct *work)
 	if (card->resume_pre)
 		card->resume_pre(card);
 
-	/* resume control bus DAIs */
-	for_each_card_rtds(card, rtd) {
-		struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
-
-		if (rtd->dai_link->ignore_suspend)
-			continue;
-
-		if (cpu_dai->driver->bus_control)
-			snd_soc_dai_resume(cpu_dai);
-	}
-
 	for_each_card_components(card, component) {
 		if (snd_soc_component_is_suspended(component))
 			snd_soc_component_resume(component);
@@ -726,16 +695,6 @@ static void soc_resume_deferred(struct work_struct *work)
 		}
 	}
 
-	for_each_card_rtds(card, rtd) {
-		struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
-
-		if (rtd->dai_link->ignore_suspend)
-			continue;
-
-		if (!cpu_dai->driver->bus_control)
-			snd_soc_dai_resume(cpu_dai);
-	}
-
 	if (card->resume_post)
 		card->resume_post(card);
 

sound/soc/soc-dai.c

@@ -354,18 +354,6 @@ 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);
-}
-
-void snd_soc_dai_resume(struct snd_soc_dai *dai)
-{
-	if (dai->driver->resume)
-		dai->driver->resume(dai);
-}
-
 int snd_soc_dai_probe(struct snd_soc_dai *dai)
 {
 	if (dai->driver->probe)