[PATCH v2 1/3] ASoC: es8316: Increment max value for ALC Capture Target Volume control

[Cristian Ciocaltea]

The following error occurs when trying to restore a previously saved
ALSA mixer state (tested on a Rock 5B board):

  $ alsactl --no-ucm -f /tmp/asound.state store hw:Analog
  $ alsactl --no-ucm -I -f /tmp/asound.state restore hw:Analog
  alsactl: set_control:1475: Cannot write control '2:0:0:ALC Capture Target Volume:0' : Invalid argument

According to ES8316 datasheet, the register at address 0x2B, which is
related to the above mixer control, contains by default the value 0xB0.
Considering the corresponding ALC target bits (ALCLVL) are 7:4, the
control is initialized with 11, which is one step above the maximum
value allowed by the driver:

 ALCLVL | dB gain
 -------+--------
  0000  |  -16.5
  0001  |  -15.0
  0010  |  -13.5
  ....  |  .....
  0111  |   -6.0
  1000  |   -4.5
  1001  |   -3.0
  1010  |   -1.5
  ....  |  .....
  1111  |   -1.5

The tests performed using the VU meter feature (--vumeter=TYPE) of
arecord/aplay confirm the specs are correct and there is no measured
gain if the 1011-1111 range would have been mapped to 0 dB:

 dB gain | VU meter %
 --------+-----------
   -6.0  |  30-31
   -4.5  |  35-36
   -3.0  |  42-43
   -1.5  |  50-51
    0.0  |  50-51

Increment the max value allowed for ALC Capture Target Volume control,
so that it matches the hardware default.  Additionally, update the
related TLV to prevent an artificial extension of the dB gain range.

Fixes: b8b88b70875a ("ASoC: add es8316 codec driver")
Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea at collabora.com>
---
 sound/soc/codecs/es8316.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/sound/soc/codecs/es8316.c b/sound/soc/codecs/es8316.c
index 9e033fb320a0..8f0625b45b7c 100644
--- a/sound/soc/codecs/es8316.c
+++ b/sound/soc/codecs/es8316.c
@@ -52,7 +52,12 @@ static const SNDRV_CTL_TLVD_DECLARE_DB_SCALE(dac_vol_tlv, -9600, 50, 1);
 static const SNDRV_CTL_TLVD_DECLARE_DB_SCALE(adc_vol_tlv, -9600, 50, 1);
 static const SNDRV_CTL_TLVD_DECLARE_DB_SCALE(alc_max_gain_tlv, -650, 150, 0);
 static const SNDRV_CTL_TLVD_DECLARE_DB_SCALE(alc_min_gain_tlv, -1200, 150, 0);
-static const SNDRV_CTL_TLVD_DECLARE_DB_SCALE(alc_target_tlv, -1650, 150, 0);
+
+static const SNDRV_CTL_TLVD_DECLARE_DB_RANGE(alc_target_tlv,
+	0, 10, TLV_DB_SCALE_ITEM(-1650, 150, 0),
+	11, 11, TLV_DB_SCALE_ITEM(-150, 0, 0),
+);
+
 static const SNDRV_CTL_TLVD_DECLARE_DB_RANGE(hpmixer_gain_tlv,
 	0, 4, TLV_DB_SCALE_ITEM(-1200, 150, 0),
 	8, 11, TLV_DB_SCALE_ITEM(-450, 150, 0),
@@ -115,7 +120,7 @@ static const struct snd_kcontrol_new es8316_snd_controls[] = {
 		       alc_max_gain_tlv),
 	SOC_SINGLE_TLV("ALC Capture Min Volume", ES8316_ADC_ALC2, 0, 28, 0,
 		       alc_min_gain_tlv),
-	SOC_SINGLE_TLV("ALC Capture Target Volume", ES8316_ADC_ALC3, 4, 10, 0,
+	SOC_SINGLE_TLV("ALC Capture Target Volume", ES8316_ADC_ALC3, 4, 11, 0,
 		       alc_target_tlv),
 	SOC_SINGLE("ALC Capture Hold Time", ES8316_ADC_ALC3, 0, 10, 0),
 	SOC_SINGLE("ALC Capture Decay Time", ES8316_ADC_ALC4, 4, 10, 0),
-- 
2.40.1