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authorHans de Goede <hdegoede@redhat.com>2021-02-26 15:38:14 +0100
committerMark Brown <broonie@kernel.org>2021-03-10 13:49:43 +0100
commiteee51df776bd6cac10a76b2779a9fdee3f622b2b (patch)
treeebccc6549d4afb3fa2d1bb80211e1be48700dad0 /drivers/bus/uniphier-system-bus.c
parentASoC: rt5640: Fix dac- and adc- vol-tlv values being off by a factor of 10 (diff)
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ASoC: rt5651: 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. Note this mirrors commit 3f31f7d9b540 ("ASoC: rt5670: Fix dac- and adc- vol-tlv values being off by a factor of 10") which made the exact same change to the rt5670 codec driver. Signed-off-by: Hans de Goede <hdegoede@redhat.com> Link: https://lore.kernel.org/r/20210226143817.84287-3-hdegoede@redhat.com Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/bus/uniphier-system-bus.c')
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