From dcb407b257af06fa58b0544ec01ec9e0d3927e02 Mon Sep 17 00:00:00 2001
From: "Andrew F. Davis" <afd@ti.com>
Date: Wed, 29 Nov 2017 15:32:54 -0600
Subject: [PATCH] ASoC: tlv320aic31xx: Handle inverted BCLK in non-DSP modes
Git-commit: dcb407b257af06fa58b0544ec01ec9e0d3927e02
Patch-mainline: v4.16-rc1
References: stable 4.14.y
Currently BCLK inverting is only handled when the DAI format is
DSP, but the BCLK may be inverted in any supported mode. Without
this using this CODEC in any other mode than DSP with the BCLK
inverted leads to bad sampling timing and very poor audio quality.
Signed-off-by: Andrew F. Davis <afd@ti.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
sound/soc/codecs/tlv320aic31xx.c | 28 ++++++++++++++++++----------
1 file changed, 18 insertions(+), 10 deletions(-)
--- a/sound/soc/codecs/tlv320aic31xx.c
+++ b/sound/soc/codecs/tlv320aic31xx.c
@@ -924,6 +924,18 @@ static int aic31xx_set_dai_fmt(struct sn
return -EINVAL;
}
+ /* signal polarity */
+ switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
+ case SND_SOC_DAIFMT_NB_NF:
+ break;
+ case SND_SOC_DAIFMT_IB_NF:
+ iface_reg2 |= AIC31XX_BCLKINV_MASK;
+ break;
+ default:
+ dev_err(codec->dev, "Invalid DAI clock signal polarity\n");
+ return -EINVAL;
+ }
+
/* interface format */
switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
case SND_SOC_DAIFMT_I2S:
@@ -931,16 +943,12 @@ static int aic31xx_set_dai_fmt(struct sn
case SND_SOC_DAIFMT_DSP_A:
dsp_a_val = 0x1; /* fall through */
case SND_SOC_DAIFMT_DSP_B:
- /* NOTE: BCLKINV bit value 1 equas NB and 0 equals IB */
- switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
- case SND_SOC_DAIFMT_NB_NF:
- iface_reg2 |= AIC31XX_BCLKINV_MASK;
- break;
- case SND_SOC_DAIFMT_IB_NF:
- break;
- default:
- return -EINVAL;
- }
+ /*
+ * NOTE: This CODEC samples on the falling edge of BCLK in
+ * DSP mode, this is inverted compared to what most DAIs
+ * expect, so we invert for this mode
+ */
+ iface_reg2 ^= AIC31XX_BCLKINV_MASK;
iface_reg1 |= (AIC31XX_DSP_MODE <<
AIC31XX_IFACE1_DATATYPE_SHIFT);
break;