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ASoC: tas2764: Wait for ramp-down after shutdown

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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.

Signed-off-by: Hector Martin <marcan@marcan.st>
Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://patch.msgid.link/20250208-asoc-tas2764-v1-2-dbab892a69b5@kernel.org
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Hector Martin
2025-02-08 01:03:25 +00:00
committed by Mark Brown
parent 1c3b5f3740
commit 08a66f55f7
1 changed files with 8 additions and 0 deletions
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8
sound/soc/codecs/tas2764.c
View File

@@ -142,6 +142,8 @@ 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;
}
@@ -228,10 +230,16 @@ 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;