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ASoC: sun8i-codec: Add a comment on the LRCK inversion 

The current code might be a bit intriguing without having experienced the
issue before, and might come up as a mistake.

Make explicit what's going on by adding a comment.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Maxime Ripard 2017-11-09 10:40:46 +01:00 committed by Mark Brown
parent 18c1bf35c1
commit e7b8a6d3ef
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1 changed files with 11 additions and 0 deletions
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11
sound/soc/sunxi/sun8i-codec.c
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@ -197,6 +197,17 @@ static int sun8i_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
regmap_update_bits(scodec->regmap, SUN8I_AIF1CLK_CTRL,
BIT(SUN8I_AIF1CLK_CTRL_AIF1_BCLK_INV),
value << SUN8I_AIF1CLK_CTRL_AIF1_BCLK_INV);
/*
* It appears that the DAI and the codec don't share the same
* polarity for the LRCK signal when they mean 'normal' and
* 'inverted' in the datasheet.
*
* Since the DAI here is our regular i2s driver that have been
* tested with way more codecs than just this one, it means
* that the codec probably gets it backward, and we have to
* invert the value here.
*/
regmap_update_bits(scodec->regmap, SUN8I_AIF1CLK_CTRL,
BIT(SUN8I_AIF1CLK_CTRL_AIF1_LRCK_INV),
!value << SUN8I_AIF1CLK_CTRL_AIF1_LRCK_INV);