Partially reverts commit 128f825aeab7 ("ASoC: max98357a: move control
of SD_MODE to DAPM").
In order to have mute control of max98357 from machine drivers, commit
128f825aeab7 ("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 128f825aeab7 caused sequence of DAI clocks and SD_MODE
changed on rk3399-gru-kevin boards.
With the commit 128f825aeab7:
- 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: Tzung-Bi Shih <tzungbi@xxxxxxxxxx>
---
This patch addresses the reported issue in the thread
https://lkml.org/lkml/2020/7/16/427
sound/soc/codecs/max98357a.c | 50 ++++++++++++++++++++++++++++--------
1 file changed, 40 insertions(+), 10 deletions(-)
diff --git a/sound/soc/codecs/max98357a.c b/sound/soc/codecs/max98357a.c
index 4f431133d0bb..918812763884 100644
--- a/sound/soc/codecs/max98357a.c
+++ b/sound/soc/codecs/max98357a.c
@@ -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);
- gpiod_set_value(max98357a->sdmode, 1);
- dev_dbg(component->dev, "set sdmode to 1");
- } else if (event & SND_SOC_DAPM_PRE_PMD) {
+ 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");
+ }
+ 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)
--
2.28.0.rc0.105.gf9edc3c819-goog
