[PATCH 6.6 055/105] ASoC: codecs: Fix gain setting ranges for Renesas IDT821034 codec

Greg Kroah-Hartman
2025-10-21T19:55:58Z

From: Christophe Leroy <christophe.leroy@csgroup.eu>

[ Upstream commit 6370a996f308ea3276030769b7482b346e7cc7c1 ]

The gain ranges specified in Renesas IDT821034 codec documentation
are [-3dB;+13dB] in the transmit path (ADC) and [-13dB;+3dB] in the
receive path (DAC). Allthough the registers allow programming values
outside those ranges, the signal S/N and distorsion are only
guaranteed in the specified ranges.

Set ranges to the specified ones.

Fixes: e51166990e81 ("ASoC: codecs: Add support for the Renesas IDT821034 codec")
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Link: https://patch.msgid.link/2bd547194f3398e6182f770d7d6be711c702b4b2.1760029099.git.christophe.leroy@csgroup.eu
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
sound/soc/codecs/idt821034.c | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/sound/soc/codecs/idt821034.c b/sound/soc/codecs/idt821034.c
index 2cc7b9166e695..068a5448e273e 100644
--- a/sound/soc/codecs/idt821034.c
+++ b/sound/soc/codecs/idt821034.c
@@ -548,14 +548,14 @@ static int idt821034_kctrl_mute_put(struct snd_kcontrol *kcontrol,
return ret;
}

-static const DECLARE_TLV_DB_LINEAR(idt821034_gain_in, -6520, 1306);
-#define IDT821034_GAIN_IN_MIN_RAW 1 /* -65.20 dB -> 10^(-65.2/20.0) * 1820 = 1 */
-#define IDT821034_GAIN_IN_MAX_RAW 8191 /* 13.06 dB -> 10^(13.06/20.0) * 1820 = 8191 */
+static const DECLARE_TLV_DB_LINEAR(idt821034_gain_in, -300, 1300);
+#define IDT821034_GAIN_IN_MIN_RAW 1288 /* -3.0 dB -> 10^(-3.0/20.0) * 1820 = 1288 */
+#define IDT821034_GAIN_IN_MAX_RAW 8130 /* 13.0 dB -> 10^(13.0/20.0) * 1820 = 8130 */
#define IDT821034_GAIN_IN_INIT_RAW 1820 /* 0dB -> 10^(0/20) * 1820 = 1820 */

-static const DECLARE_TLV_DB_LINEAR(idt821034_gain_out, -6798, 1029);
-#define IDT821034_GAIN_OUT_MIN_RAW 1 /* -67.98 dB -> 10^(-67.98/20.0) * 2506 = 1*/
-#define IDT821034_GAIN_OUT_MAX_RAW 8191 /* 10.29 dB -> 10^(10.29/20.0) * 2506 = 8191 */
+static const DECLARE_TLV_DB_LINEAR(idt821034_gain_out, -1300, 300);
+#define IDT821034_GAIN_OUT_MIN_RAW 561 /* -13.0 dB -> 10^(-13.0/20.0) * 2506 = 561 */
+#define IDT821034_GAIN_OUT_MAX_RAW 3540 /* 3.0 dB -> 10^(3.0/20.0) * 2506 = 3540 */
#define IDT821034_GAIN_OUT_INIT_RAW 2506 /* 0dB -> 10^(0/20) * 2506 = 2506 */

static const struct snd_kcontrol_new idt821034_controls[] = {
--
2.51.0