linux-kernel - [PATCH AUTOSEL for 4.14 32/84] ASoC: tlv320aic31xx: Handle inverted BCLK in non-DSP modes

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20180303222518.26271-32-alexander.levin@microsoft.com>
Date:   Sat, 3 Mar 2018 22:26:18 +0000
From:   Sasha Levin <Alexander.Levin@...rosoft.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
CC:     "Andrew F. Davis" <afd@...com>, Mark Brown <broonie@...nel.org>,
        Sasha Levin <Alexander.Levin@...rosoft.com>
Subject: [PATCH AUTOSEL for 4.14 32/84] ASoC: tlv320aic31xx: Handle inverted
 BCLK in non-DSP modes

From: "Andrew F. Davis" <afd@...com>

[ Upstream commit dcb407b257af06fa58b0544ec01ec9e0d3927e02 ]

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@...com>
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
---
 sound/soc/codecs/tlv320aic31xx.c | 28 ++++++++++++++++++----------
 1 file changed, 18 insertions(+), 10 deletions(-)

diff --git a/sound/soc/codecs/tlv320aic31xx.c b/sound/soc/codecs/tlv320aic31xx.c
index 54a87a905eb6..d3bd0bf15ddb 100644
--- a/sound/soc/codecs/tlv320aic31xx.c
+++ b/sound/soc/codecs/tlv320aic31xx.c
@@ -924,6 +924,18 @@ static int aic31xx_set_dai_fmt(struct snd_soc_dai *codec_dai,
 		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 snd_soc_dai *codec_dai,
 	case SND_SOC_DAIFMT_DSP_A:
 		dsp_a_val = 0x1;
 	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;
-- 
2.14.1