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

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: NPeter Ujfalusi <peter.ujfalusi@ti.com>
Acked-by: NLiam Girdwood <lrg@ti.com>
Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/codecs/twl6040.c

@@ -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)