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| author | Hans de Goede <hdegoede@redhat.com> | 2020-06-28 17:52:29 +0200 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2020-06-29 20:37:21 +0100 |
| commit | 3f31f7d9b5404a10648abe536c8b408bfb4502e1 (patch) | |
| tree | 4e9e5ac9f22b2576e98b7b29b7ac06267454ec97 /sound/soc/codecs/rt5670.c | |
| parent | 85ca6b17e2bb96b19caac3b02c003d670b66de96 (diff) | |
| download | lwn-3f31f7d9b5404a10648abe536c8b408bfb4502e1.tar.gz lwn-3f31f7d9b5404a10648abe536c8b408bfb4502e1.zip | |
ASoC: rt5670: Fix dac- and adc- vol-tlv values being off by a factor of 10
The adc_vol_tlv volume-control has a range from -17.625 dB to +30 dB,
not -176.25 dB to + 300 dB. This wrong scale is esp. a problem in userspace
apps which translate the dB scale to a linear scale. With the logarithmic
dB scale being of by a factor of 10 we loose all precision in the lower
area of the range when apps translate things to a linear scale.
E.g. the 0 dB default, which corresponds with a value of 47 of the
0 - 127 range for the control, would be shown as 0/100 in alsa-mixer.
Since the centi-dB values used in the TLV struct cannot represent the
0.375 dB step size used by these controls, change the TLV definition
for them to specify a min and max value instead of min + stepsize.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20200628155231.71089-5-hdegoede@redhat.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'sound/soc/codecs/rt5670.c')
| -rw-r--r-- | sound/soc/codecs/rt5670.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/sound/soc/codecs/rt5670.c b/sound/soc/codecs/rt5670.c index f21181734170..dfbc0ca38ff7 100644 --- a/sound/soc/codecs/rt5670.c +++ b/sound/soc/codecs/rt5670.c @@ -603,9 +603,9 @@ int rt5670_set_jack_detect(struct snd_soc_component *component, EXPORT_SYMBOL_GPL(rt5670_set_jack_detect); static const DECLARE_TLV_DB_SCALE(out_vol_tlv, -4650, 150, 0); -static const DECLARE_TLV_DB_SCALE(dac_vol_tlv, -65625, 375, 0); +static const DECLARE_TLV_DB_MINMAX(dac_vol_tlv, -6562, 0); static const DECLARE_TLV_DB_SCALE(in_vol_tlv, -3450, 150, 0); -static const DECLARE_TLV_DB_SCALE(adc_vol_tlv, -17625, 375, 0); +static const DECLARE_TLV_DB_MINMAX(adc_vol_tlv, -1762, 3000); static const DECLARE_TLV_DB_SCALE(adc_bst_tlv, 0, 1200, 0); /* {0, +20, +24, +30, +35, +40, +44, +50, +52} dB */ |