ASoC: soc-core: remove bus_control

Now, snd_soc_dai_driver::bus_control is used for how to resume.
But, no driver which has bus_control has DAI driver suspend/resume
support.
This patch removes pointless bus_control from ALSA SoC.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://lore.kernel.org/r/87pnffx7i4.wl-kuninori.morimoto.gx@renesas.com
Signed-off-by: Mark Brown <broonie@kernel.org>

include/sound/soc-dai.h

@@ -302,7 +302,6 @@ struct snd_soc_dai_driver {
 	unsigned int symmetric_rates:1;
 	unsigned int symmetric_channels:1;
 	unsigned int symmetric_samplebits:1;
-	unsigned int bus_control:1; /* DAI is also used for the control bus */
 
 	/* probe ordering - for components with runtime dependencies */
 	int probe_order;

sound/soc/au1x/ac97c.c

@@ -206,7 +206,6 @@ static int au1xac97c_dai_probe(struct snd_soc_dai *dai)
 
 static struct snd_soc_dai_driver au1xac97c_dai_driver = {
 	.name			= "alchemy-ac97c",
-	.bus_control		= true,
 	.probe			= au1xac97c_dai_probe,
 	.playback = {
 		.rates		= AC97_RATES,

sound/soc/au1x/psc-ac97.c

@@ -339,7 +339,6 @@ static const struct snd_soc_dai_ops au1xpsc_ac97_dai_ops = {
 };
 
 static const struct snd_soc_dai_driver au1xpsc_ac97_dai_template = {
-	.bus_control		= true,
 	.probe			= au1xpsc_ac97_probe,
 	.playback = {
 		.rates		= AC97_RATES,

sound/soc/cirrus/ep93xx-ac97.c

@@ -336,7 +336,6 @@ static const struct snd_soc_dai_ops ep93xx_ac97_dai_ops = {
 static struct snd_soc_dai_driver ep93xx_ac97_dai = {
 	.name		= "ep93xx-ac97",
 	.id		= 0,
-	.bus_control	= true,
 	.probe		= ep93xx_ac97_dai_probe,
 	.playback	= {
 		.stream_name	= "AC97 Playback",

sound/soc/fsl/fsl_ssi.c

@@ -1136,7 +1136,6 @@ static const struct snd_soc_component_driver fsl_ssi_component = {
 };
 
 static struct snd_soc_dai_driver fsl_ssi_ac97_dai = {
-	.bus_control = true,
 	.symmetric_channels = 1,
 	.probe = fsl_ssi_dai_probe,
 	.playback = {

sound/soc/fsl/imx-ssi.c

@@ -373,7 +373,6 @@ static struct snd_soc_dai_driver imx_ssi_dai = {
 
 static struct snd_soc_dai_driver imx_ac97_dai = {
 	.probe = imx_ssi_dai_probe,
-	.bus_control = true,
 	.playback = {
 		.stream_name = "AC97 Playback",
 		.channels_min = 2,

sound/soc/fsl/mpc5200_psc_ac97.c

@@ -233,7 +233,6 @@ static const struct snd_soc_dai_ops psc_ac97_digital_ops = {
 static struct snd_soc_dai_driver psc_ac97_dai[] = {
 {
 	.name = "mpc5200-psc-ac97.0",
-	.bus_control = true,
 	.probe	= psc_ac97_probe,
 	.playback = {
 		.stream_name	= "AC97 Playback",
@@ -253,7 +252,6 @@ static struct snd_soc_dai_driver psc_ac97_dai[] = {
 },
 {
 	.name = "mpc5200-psc-ac97.1",
-	.bus_control = true,
 	.playback = {
 		.stream_name	= "AC97 SPDIF",
 		.channels_min   = 1,

sound/soc/pxa/pxa2xx-ac97.c

@@ -157,7 +157,6 @@ static const struct snd_soc_dai_ops pxa_ac97_mic_dai_ops = {
 static struct snd_soc_dai_driver pxa_ac97_dai_driver[] = {
 {
 	.name = "pxa2xx-ac97",
-	.bus_control = true,
 	.playback = {
 		.stream_name = "AC97 Playback",
 		.channels_min = 2,
@@ -174,7 +173,6 @@ static struct snd_soc_dai_driver pxa_ac97_dai_driver[] = {
 },
 {
 	.name = "pxa2xx-ac97-aux",
-	.bus_control = true,
 	.playback = {
 		.stream_name = "AC97 Aux Playback",
 		.channels_min = 1,
@@ -191,7 +189,6 @@ static struct snd_soc_dai_driver pxa_ac97_dai_driver[] = {
 },
 {
 	.name = "pxa2xx-ac97-mic",
-	.bus_control = true,
 	.capture = {
 		.stream_name = "AC97 Mic Capture",
 		.channels_min = 1,

sound/soc/sh/hac.c

@@ -270,7 +270,6 @@ static const struct snd_soc_dai_ops hac_dai_ops = {
 static struct snd_soc_dai_driver sh4_hac_dai[] = {
 {
 	.name			= "hac-dai.0",
-	.bus_control		= true,
 	.playback = {
 		.rates		= AC97_RATES,
 		.formats	= AC97_FMTS,

sound/soc/soc-core.c

@@ -712,8 +712,6 @@ static void soc_resume_deferred(struct work_struct *work)
 int snd_soc_resume(struct device *dev)
 {
 	struct snd_soc_card *card = dev_get_drvdata(dev);
-	bool bus_control = false;
-	struct snd_soc_pcm_runtime *rtd;
 	struct snd_soc_component *component;
 
 	/* If the card is not initialized yet there is nothing to do */
@@ -725,25 +723,9 @@ int snd_soc_resume(struct device *dev)
 		if (component->active)
 			pinctrl_pm_select_default_state(component->dev);
 
-	/*
-	 * DAIs that also act as the control bus master might have other drivers
-	 * hanging off them so need to resume immediately. Other drivers don't
-	 * have that problem and may take a substantial amount of time to resume
-	 * due to I/O costs and anti-pop so handle them out of line.
-	 */
-	for_each_card_rtds(card, rtd) {
-		struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
-
-		bus_control |= cpu_dai->driver->bus_control;
-	}
-	if (bus_control) {
-		dev_dbg(dev, "ASoC: Resuming control bus master immediately\n");
-		soc_resume_deferred(&card->deferred_resume_work);
-	} else {
-		dev_dbg(dev, "ASoC: Scheduling resume work\n");
-		if (!schedule_work(&card->deferred_resume_work))
-			dev_err(dev, "ASoC: resume work item may be lost\n");
-	}
+	dev_dbg(dev, "ASoC: Scheduling resume work\n");
+	if (!schedule_work(&card->deferred_resume_work))
+		dev_err(dev, "ASoC: resume work item may be lost\n");
 
 	return 0;
 }

sound/soc/tegra/tegra20_ac97.c

@@ -219,7 +219,6 @@ static int tegra20_ac97_probe(struct snd_soc_dai *dai)
 
 static struct snd_soc_dai_driver tegra20_ac97_dai = {
 	.name = "tegra-ac97-pcm",
-	.bus_control = true,
 	.probe = tegra20_ac97_probe,
 	.playback = {
 		.stream_name = "PCM Playback",

sound/soc/txx9/txx9aclc-ac97.c

@@ -148,7 +148,6 @@ static int txx9aclc_ac97_remove(struct snd_soc_dai *dai)
 }
 
 static struct snd_soc_dai_driver txx9aclc_ac97_dai = {
-	.bus_control		= true,
 	.probe			= txx9aclc_ac97_probe,
 	.remove			= txx9aclc_ac97_remove,
 	.playback = {