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ASoC: twl6040: Lower the power on gain values at startup

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The default gains on outputs/inputs are set to 0dB.
This is fixing the pop noise issue at the first playback, which
caused by the wrong starting point of the ramp code.
The ramp code for the outputs expects the gains to be in
their lowest configuration in order to be effective.
After the playback stops, the ramp code takes care of
ramping down the gains to their minimum.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Acked-by: Liam Girdwood <lrg@ti.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Peter Ujfalusi 2011-09-22 11:05:45 +03:00 committed by Mark Brown
parent fadd81b52c
commit 3acef6854c
1 changed files with 11 additions and 0 deletions
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11
sound/soc/codecs/twl6040.c
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@ -269,6 +269,17 @@ static void twl6040_init_chip(struct snd_soc_codec *codec)
/* No imput selected for microphone amplifiers */
twl6040_write_reg_cache(codec, TWL6040_REG_MICLCTL, 0x18);
twl6040_write_reg_cache(codec, TWL6040_REG_MICRCTL, 0x18);
/*
* We need to lower the default gain values, so the ramp code
* can work correctly for the first playback.
* This reduces the pop noise heard at the first playback.
*/
twl6040_write_reg_cache(codec, TWL6040_REG_HSGAIN, 0xff);
twl6040_write_reg_cache(codec, TWL6040_REG_EARCTL, 0x1e);
twl6040_write_reg_cache(codec, TWL6040_REG_HFLGAIN, 0x1d);
twl6040_write_reg_cache(codec, TWL6040_REG_HFRGAIN, 0x1d);
twl6040_write_reg_cache(codec, TWL6040_REG_LINEGAIN, 0);
}
static void twl6040_restore_regs(struct snd_soc_codec *codec)