Unverified Commit 04a646ff authored by Tzung-Bi Shih's avatar Tzung-Bi Shih Committed by Mark Brown
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ASoC: max98357a: move control of SD_MODE back to DAI ops 



Partially reverts commit 128f825a ("ASoC: max98357a: move control
of SD_MODE to DAPM").

In order to have mute control of max98357 from machine drivers, commit
128f825a ("ASoC: max98357a: move control of SD_MODE to DAPM")
moves the control of SD_MODE from DAI ops to DAPM events.  However, pop
noise has been observed on rk3399-gru-kevin boards due to this commit.

The commit 128f825a caused sequence of DAI clocks and SD_MODE
changed on rk3399-gru-kevin boards.

With the commit 128f825a:
- SD_MODE will be set to 1 before DAI clocks start.
- SD_MODE will be set to 0 after DAI clocks stop.
As a result, pop noise.

Moves the control of SD_MODE back to DAI ops.  In the meantime, uses an
additional flag in DAPM event to provide chance of mute control for
machine drivers.

Signed-off-by: default avatarTzung-Bi Shih <tzungbi@google.com>
Tested-By: default avatarAlper Nebi Yasak <alpernebiyasak@gmail.com>
Link: https://lore.kernel.org/r/20200721114232.2812254-1-tzungbi@google.com


Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent 468ae359

sound/soc/codecs/max98357a.c

+40 −10
Original line number Diff line number Diff line
@@ -23,36 +23,61 @@ 
struct max98357a_priv {

	struct gpio_desc *sdmode;

	unsigned int sdmode_delay;

	int sdmode_switch;

};



static int max98357a_sdmode_event(struct snd_soc_dapm_widget *w,

		struct snd_kcontrol *kcontrol, int event)

static int max98357a_daiops_trigger(struct snd_pcm_substream *substream,

		int cmd, struct snd_soc_dai *dai)

{

	struct snd_soc_component *component =

		snd_soc_dapm_to_component(w->dapm);

	struct snd_soc_component *component = dai->component;

	struct max98357a_priv *max98357a =

		snd_soc_component_get_drvdata(component);



	if (!max98357a->sdmode)

		return 0;



	if (event & SND_SOC_DAPM_POST_PMU) {

		msleep(max98357a->sdmode_delay);

	switch (cmd) {

	case SNDRV_PCM_TRIGGER_START:

	case SNDRV_PCM_TRIGGER_RESUME:

	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:

		mdelay(max98357a->sdmode_delay);

		if (max98357a->sdmode_switch) {

			gpiod_set_value(max98357a->sdmode, 1);

			dev_dbg(component->dev, "set sdmode to 1");

	} else if (event & SND_SOC_DAPM_PRE_PMD) {

		}

		break;

	case SNDRV_PCM_TRIGGER_STOP:

	case SNDRV_PCM_TRIGGER_SUSPEND:

	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:

		gpiod_set_value(max98357a->sdmode, 0);

		dev_dbg(component->dev, "set sdmode to 0");

		break;

	}



	return 0;

}



static int max98357a_sdmode_event(struct snd_soc_dapm_widget *w,

		struct snd_kcontrol *kcontrol, int event)

{

	struct snd_soc_component *component =

		snd_soc_dapm_to_component(w->dapm);

	struct max98357a_priv *max98357a =

		snd_soc_component_get_drvdata(component);



	if (event & SND_SOC_DAPM_POST_PMU)

		max98357a->sdmode_switch = 1;

	else if (event & SND_SOC_DAPM_POST_PMD)

		max98357a->sdmode_switch = 0;



	return 0;

}



static const struct snd_soc_dapm_widget max98357a_dapm_widgets[] = {

	SND_SOC_DAPM_OUTPUT("Speaker"),

	SND_SOC_DAPM_OUT_DRV_E("SD_MODE", SND_SOC_NOPM, 0, 0, NULL, 0,

			max98357a_sdmode_event,

			SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_PRE_PMD),

			SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_POST_PMD),

};



static const struct snd_soc_dapm_route max98357a_dapm_routes[] = {
@@ -71,6 +96,10 @@ static const struct snd_soc_component_driver max98357a_component_driver = { 
	.non_legacy_dai_naming	= 1,

};



static const struct snd_soc_dai_ops max98357a_dai_ops = {

	.trigger        = max98357a_daiops_trigger,

};



static struct snd_soc_dai_driver max98357a_dai_driver = {

	.name = "HiFi",

	.playback = {
@@ -90,6 +119,7 @@ static struct snd_soc_dai_driver max98357a_dai_driver = { 
		.channels_min	= 1,

		.channels_max	= 2,

	},

	.ops    = &max98357a_dai_ops,

};



static int max98357a_platform_probe(struct platform_device *pdev)

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