From a50b7926d015c3b8194ab1d7c8aa86db8e4b7700 Mon Sep 17 00:00:00 2001 From: Ahmad Fatoum Date: Wed, 2 Mar 2022 09:34:28 +0100 Subject: [PATCH] ASoC: fsl_sai: implement 1:1 bclk:mclk ratio support With higher channel counts, we may need higher clock rates. Starting with SAI v3.1 (i.MX8MM), we can bypass the divider and get a 1:1 bclk:mclk ratio. Add the necessary support. Signed-off-by: Viorel Suman Signed-off-by: Ahmad Fatoum Signed-off-by: Sascha Hauer Link: https://lore.kernel.org/r/20220302083428.3804687-8-s.hauer@pengutronix.de Signed-off-by: Mark Brown --- sound/soc/fsl/fsl_sai.c | 17 +++++++++++++++-- 1 file changed, 15 insertions(+), 2 deletions(-) diff --git a/sound/soc/fsl/fsl_sai.c b/sound/soc/fsl/fsl_sai.c index 761fa8229a091..4650a6931a946 100644 --- a/sound/soc/fsl/fsl_sai.c +++ b/sound/soc/fsl/fsl_sai.c @@ -347,6 +347,7 @@ static int fsl_sai_set_bclk(struct snd_soc_dai *dai, bool tx, u32 freq) int adir = tx ? RX : TX; int dir = tx ? TX : RX; u32 id; + bool support_1_1_ratio = sai->verid.version >= 0x0301; /* Don't apply to consumer mode */ if (sai->is_consumer_mode) @@ -367,7 +368,11 @@ static int fsl_sai_set_bclk(struct snd_soc_dai *dai, bool tx, u32 freq) continue; ratio = DIV_ROUND_CLOSEST(clk_rate, freq); - if (!ratio || ratio > 512 || ratio & 1) + if (!ratio || ratio > 512) + continue; + if (ratio == 1 && !support_1_1_ratio) + continue; + else if (ratio & 1) continue; diff = abs((long)clk_rate - ratio * freq); @@ -422,7 +427,15 @@ static int fsl_sai_set_bclk(struct snd_soc_dai *dai, bool tx, u32 freq) regmap_update_bits(sai->regmap, reg, FSL_SAI_CR2_MSEL_MASK, FSL_SAI_CR2_MSEL(sai->mclk_id[tx])); - regmap_update_bits(sai->regmap, reg, FSL_SAI_CR2_DIV_MASK, savediv / 2 - 1); + + if (savediv == 1) + regmap_update_bits(sai->regmap, reg, + FSL_SAI_CR2_DIV_MASK | FSL_SAI_CR2_BYP, + FSL_SAI_CR2_BYP); + else + regmap_update_bits(sai->regmap, reg, + FSL_SAI_CR2_DIV_MASK | FSL_SAI_CR2_BYP, + savediv / 2 - 1); return 0; } -- 2.30.2