linux-kernel - [PATCH] ASoC: tlv320adcx140: Fix digital gain range

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Date:   Tue, 8 Sep 2020 11:04:17 +0200
From:   Camel Guo <camel.guo@...s.com>
To:     <lgirdwood@...il.com>, <broonie@...nel.org>, <tiwai@...e.com>,
        <dmurphy@...com>
CC:     <alsa-devel@...a-project.org>, <linux-kernel@...r.kernel.org>,
        <kernel@...s.com>, Camel Guo <camelg@...s.com>
Subject: [PATCH] ASoC: tlv320adcx140: Fix digital gain range

From: Camel Guo <camelg@...s.com>

According to its datasheet, the digital gain should be -100 dB when
CHx_DVOL is 1 and 27 dB when CHx_DVOL is 255. But with the current
dig_vol_tlv, "Digital CHx Out Volume" shows 27.5 dB if CHx_DVOL is 255
and -95.5 dB if CHx_DVOL is 1. This commit fixes this bug.

Fixes: 689c7655b50c ("ASoC: tlv320adcx140: Add the tlv320adcx140 codec driver family")
Signed-off-by: Camel Guo <camelg@...s.com>
---
 sound/soc/codecs/tlv320adcx140.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sound/soc/codecs/tlv320adcx140.c b/sound/soc/codecs/tlv320adcx140.c
index 6d456aa269ad..13ece039e9fe 100644
--- a/sound/soc/codecs/tlv320adcx140.c
+++ b/sound/soc/codecs/tlv320adcx140.c
@@ -161,7 +161,7 @@ static const struct regmap_config adcx140_i2c_regmap = {
 };
 
 /* Digital Volume control. From -100 to 27 dB in 0.5 dB steps */
-static DECLARE_TLV_DB_SCALE(dig_vol_tlv, -10000, 50, 0);
+static DECLARE_TLV_DB_SCALE(dig_vol_tlv, -10050, 50, 0);
 
 /* ADC gain. From 0 to 42 dB in 1 dB steps */
 static DECLARE_TLV_DB_SCALE(adc_tlv, 0, 100, 0);
-- 
2.20.1