ASoC: wm8978: Fix the 128x oversampling switch bits

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The DAC and ADC 128x Oversampling Switches use bit 5 of R10 and R14.
Table 66 of the WM8978 datasheet puts DACOSR128 and ADCOSR128 at bit 3
of those registers.

In R14, bit 5 is inside HPFCUT[6:4], which the High Pass Cut Off
control owns. So turning on ADC oversampling changes the high pass
cut-off, and the oversampling bit cannot be set. In R10, bit 5 is
reserved, so the DAC switch has no effect.

Use bit 3 for both.

Fixes: 823dba5191 ("ASoC: Fix broken bitfield definitions in WM8978")
Assisted-by: Claude:claude-opus-5-5
Signed-off-by: HyeongJun An <sammiee5311@gmail.com>
Link: https://patch.msgid.link/20261008130953.2446692-6-sammiee5311@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>

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HyeongJun An 2026-10-08 22:09:51 +09:00 • committed by Mark Brown

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sound/soc/codecs/wm8978.c

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