From: Hector Martin <marcan@xxxxxxxxx>
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@xxxxxxxxx>
Signed-off-by: Hector Martin <marcan@xxxxxxxxx>
Signed-off-by: James Calligeros <jcalligeros99@xxxxxxxxx>
---
sound/soc/codecs/tas2764.c | 8 ++++++++
1 file changed, 8 insertions(+)
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;
--
2.48.1
