diff mbox series

[v2,23/29] ASoC: tas2764: Wait for ramp-down after shutdown

Message ID 20250218-apple-codec-changes-v2-23-932760fd7e07@gmail.com (mailing list archive)
State New
Headers show
Series ASoC: tas27{64,70}: improve support for Apple codec variants | expand

Commit Message

James Calligeros Feb. 18, 2025, 8:35 a.m. UTC 
From: Hector Martin <marcan@marcan.st>

When we shut down the amp, we need to wait for the built-in ramp-down
before we can remove the TDM clocks. There is no documented status
regiter to poll, so the best we can do is a delay. Datasheet says 5.9ms
for ramp-down and 1.5ms between shutdown and next startup, so let's do
6ms after mute and 2ms after shutdown. That gives us a cumulative 8ms
for ramp-down and guaratees the required minimum shutdown time.

Reviewed-by: Neal Gompa <neal@gompa.dev>
Signed-off-by: Hector Martin <marcan@marcan.st>
Signed-off-by: James Calligeros <jcalligeros99@gmail.com>
---
 sound/soc/codecs/tas2764.c | 8 ++++++++
 1 file changed, 8 insertions(+)
diff mbox series

Patch

diff --git a/sound/soc/codecs/tas2764.c b/sound/soc/codecs/tas2764.c
index 3c21810358881b6935a50807cf7c745291dee3e6..7d6cb29a749e234b325e253985eb0feac6f44934 100644
--- a/sound/soc/codecs/tas2764.c
+++ b/sound/soc/codecs/tas2764.c
@@ -160,6 +160,8 @@  static int tas2764_codec_suspend(struct snd_soc_component *component)
 	regcache_cache_only(tas2764->regmap, true);
 	regcache_mark_dirty(tas2764->regmap);
 
+	usleep_range(6000, 7000);
+
 	return 0;
 }
 
@@ -253,10 +255,16 @@  static int tas2764_mute(struct snd_soc_dai *dai, int mute, int direction)
 		return ret;
 
 	if (mute) {
+		/* Wait for ramp-down */
+		usleep_range(6000, 7000);
+
 		tas2764->dac_powered = false;
 		ret = tas2764_update_pwr_ctrl(tas2764);
 		if (ret)
 			return ret;
+
+		/* Wait a bit after shutdown */
+		usleep_range(2000, 3000);
 	}
 
 	return 0;