From: Lars-Peter Clausen <lars@metafoo.de>
To: Mark Brown <broonie@kernel.org>, Liam Girdwood <lgirdwood@gmail.com>
Cc: alsa-devel@alsa-project.org, Lars-Peter Clausen <lars@metafoo.de>
Subject: [PATCH] ASoC: ad193x: Don't power down DAC in CODEC probe
Date: Mon, 12 Jan 2015 13:54:13 +0100 [thread overview]
Message-ID: <1421067253-14483-1-git-send-email-lars@metafoo.de> (raw)
The DAC powerdown bit is managed by DAPM. Manually powering down the DAC in
the CODEC probe function may cause unnecessary power state transitions which
can lead to click and pop noises.
So leave the DAC powerdown bit in its default poweron-reset state and let
DAPM do all the management.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
---
sound/soc/codecs/ad193x.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/sound/soc/codecs/ad193x.c b/sound/soc/codecs/ad193x.c
index 387530b..17c9535 100644
--- a/sound/soc/codecs/ad193x.c
+++ b/sound/soc/codecs/ad193x.c
@@ -333,8 +333,8 @@ static int ad193x_codec_probe(struct snd_soc_codec *codec)
regmap_write(ad193x->regmap, AD193X_DAC_CHNL_MUTE, 0x0);
/* de-emphasis: 48kHz, powedown dac */
regmap_write(ad193x->regmap, AD193X_DAC_CTRL2, 0x1A);
- /* powerdown dac, dac in tdm mode */
- regmap_write(ad193x->regmap, AD193X_DAC_CTRL0, 0x41);
+ /* dac in tdm mode */
+ regmap_write(ad193x->regmap, AD193X_DAC_CTRL0, 0x40);
/* high-pass filter enable */
regmap_write(ad193x->regmap, AD193X_ADC_CTRL0, 0x3);
/* sata delay=1, adc aux mode */
--
1.8.0
next reply other threads:[~2015-01-12 12:54 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-01-12 12:54 Lars-Peter Clausen [this message]
2015-01-12 12:58 ` [PATCH] ASoC: ad193x: Don't power down DAC in CODEC probe Mark Brown
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