[alsa-devel] [PATCH] ASoC: codecs: da9055: Minor improvement in ALC calibration process

Ashish Chavan
2012-10-11T08:23:57Z

This patch slightly improves ALC calibration process of da9055 codec
driver by muting Mic PGAs during calibration.

Signed-off-by: Ashish Chavan <ashish.chavan@kpitcummins.com>
Signed-off-by: David Dajun Chen <david.chen@diasemi.com>
---
sound/soc/codecs/da9055.c | 22 +++++++++++++++++++++-
1 files changed, 21 insertions(+), 1 deletions(-)

diff --git a/sound/soc/codecs/da9055.c b/sound/soc/codecs/da9055.c
index 27c4454..abf3e43 100644
--- a/sound/soc/codecs/da9055.c
+++ b/sound/soc/codecs/da9055.c
@@ -179,6 +179,12 @@
#define DA9055_AIF_WORD_S24_LE (2 << 2)
#define DA9055_AIF_WORD_S32_LE (3 << 2)

+/* MIC_L_CTRL bit fields */
+#define DA9055_MIC_L_MUTE_EN (1 << 6)
+
+/* MIC_R_CTRL bit fields */
+#define DA9055_MIC_R_MUTE_EN (1 << 6)
+
/* MIXIN_L_CTRL bit fields */
#define DA9055_MIXIN_L_MIX_EN (1 << 3)

@@ -477,7 +483,7 @@ static int da9055_put_alc_sw(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
- u8 reg_val, adc_left, adc_right;
+ u8 reg_val, adc_left, adc_right, mic_left, mic_right;
int avg_left_data, avg_right_data, offset_l, offset_r;

if (ucontrol->value.integer.value[0]) {
@@ -486,6 +492,16 @@ static int da9055_put_alc_sw(struct snd_kcontrol *kcontrol,
* offsets must be done first
*/

+ /* Save current values from Mic control registers */
+ mic_left = snd_soc_read(codec, DA9055_MIC_L_CTRL);
+ mic_right = snd_soc_read(codec, DA9055_MIC_R_CTRL);
+
+ /* Mute Mic PGA Left and Right */
+ snd_soc_update_bits(codec, DA9055_MIC_L_CTRL,
+ DA9055_MIC_L_MUTE_EN, DA9055_MIC_L_MUTE_EN);
+ snd_soc_update_bits(codec, DA9055_MIC_R_CTRL,
+ DA9055_MIC_R_MUTE_EN, DA9055_MIC_R_MUTE_EN);
+
/* Save current values from ADC control registers */
adc_left = snd_soc_read(codec, DA9055_ADC_L_CTRL);
adc_right = snd_soc_read(codec, DA9055_ADC_R_CTRL);
@@ -521,6 +537,10 @@ static int da9055_put_alc_sw(struct snd_kcontrol *kcontrol,
/* Restore original values of ADC control registers */
snd_soc_write(codec, DA9055_ADC_L_CTRL, adc_left);
snd_soc_write(codec, DA9055_ADC_R_CTRL, adc_right);
+
+ /* Restore original values of Mic control registers */
+ snd_soc_write(codec, DA9055_MIC_L_CTRL, mic_left);
+ snd_soc_write(codec, DA9055_MIC_R_CTRL, mic_right);
}

return snd_soc_put_volsw(kcontrol, ucontrol);
--
1.7.1