5.15-stable review patch. If anyone has any objections, please let me know.
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From: Valerio Setti vsetti@baylibre.com
[ Upstream commit 4c4ed5e073a923fb3323022e1131cb51ad8df7a0 ]
According to I2S specs audio data is sampled on the rising edge of the clock and it can change on the falling one. When operating in normal mode this SoC behaves the opposite so a clock polarity inversion is required in this case.
This was tested on an OdroidC2 (Amlogic S905 SoC) board.
Signed-off-by: Valerio Setti vsetti@baylibre.com Reviewed-by: Jerome Brunet jbrunet@baylibre.com Tested-by: Jerome Brunet jbrunet@baylibre.com Link: https://patch.msgid.link/20251007-fix-i2s-polarity-v1-1-86704d9cda10@baylibr... Signed-off-by: Mark Brown broonie@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- sound/soc/meson/aiu-encoder-i2s.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-)
diff --git a/sound/soc/meson/aiu-encoder-i2s.c b/sound/soc/meson/aiu-encoder-i2s.c index 67729de41a73e..a512cd49bc507 100644 --- a/sound/soc/meson/aiu-encoder-i2s.c +++ b/sound/soc/meson/aiu-encoder-i2s.c @@ -236,8 +236,12 @@ static int aiu_encoder_i2s_set_fmt(struct snd_soc_dai *dai, unsigned int fmt) inv == SND_SOC_DAIFMT_IB_IF) val |= AIU_CLK_CTRL_LRCLK_INVERT;
- if (inv == SND_SOC_DAIFMT_IB_NF || - inv == SND_SOC_DAIFMT_IB_IF) + /* + * The SoC changes data on the rising edge of the bitclock + * so an inversion of the bitclock is required in normal mode + */ + if (inv == SND_SOC_DAIFMT_NB_NF || + inv == SND_SOC_DAIFMT_NB_IF) val |= AIU_CLK_CTRL_AOCLK_INVERT;
/* Signal skew */ @@ -328,4 +332,3 @@ const struct snd_soc_dai_ops aiu_encoder_i2s_dai_ops = { .startup = aiu_encoder_i2s_startup, .shutdown = aiu_encoder_i2s_shutdown, }; -