Some DMICs require delay before stream capture to complete the mode
switching. Different modes can be power off, sleep etc. The DMIC clock
for a specified duration is needed for the DMIC to complete the mode
switching and ready for stream capture.
Signed-off-by: Sathyanarayana Nujella <sathyanarayana.nujella@xxxxxxxxx>
Signed-off-by: Jairaj Arava <jairaj.arava@xxxxxxxxx>
Signed-off-by: Harsha Priya <harshapriya.n@xxxxxxxxx>
---
sound/soc/codecs/dmic.c | 26 ++++++++++++++++++++++++++
1 file changed, 26 insertions(+)
diff --git a/sound/soc/codecs/dmic.c b/sound/soc/codecs/dmic.c
index ab1aa01..38d41a2 100644
--- a/sound/soc/codecs/dmic.c
+++ b/sound/soc/codecs/dmic.c
@@ -34,6 +34,29 @@
struct dmic {
struct gpio_desc *gpio_en;
int wakeup_delay;
+ /* Delay after DMIC mode switch */
+ int modeswitch_delay_ms;
+};
+
+int dmic_daiops_trigger(struct snd_pcm_substream *substream,
+ int cmd, struct snd_soc_dai *dai)
+{
+ struct snd_soc_component *component = dai->component;
+ struct dmic *dmic = snd_soc_component_get_drvdata(component);
+
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_STOP:
+ if (dmic->modeswitch_delay_ms)
+ mdelay(dmic->modeswitch_delay_ms);
+
+ break;
+ }
+
+ return 0;
+}
+
+static const struct snd_soc_dai_ops dmic_dai_ops = {
+ .trigger = dmic_daiops_trigger,
};
static int dmic_aif_event(struct snd_soc_dapm_widget *w,
@@ -69,6 +92,7 @@ static int dmic_aif_event(struct snd_soc_dapm_widget *w,
| SNDRV_PCM_FMTBIT_S24_LE
| SNDRV_PCM_FMTBIT_S16_LE,
},
+ .ops = &dmic_dai_ops,
};
static int dmic_component_probe(struct snd_soc_component *component)
@@ -86,6 +110,8 @@ static int dmic_component_probe(struct snd_soc_component *component)
device_property_read_u32(component->dev, "wakeup-delay-ms",
&dmic->wakeup_delay);
+ device_property_read_u32(component->dev, "modeswitch_delay_ms",
+ &dmic->modeswitch_delay_ms);
snd_soc_component_set_drvdata(component, dmic);
--
1.9.1
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