linux-kernel - [PATCH 2/2] ASoC: cs42l42: Remove duplicate control for WNF filter frequency

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Message-ID: <20210803160834.9005-2-rf@opensource.cirrus.com>
Date:   Tue, 3 Aug 2021 17:08:34 +0100
From:   Richard Fitzgerald <rf@...nsource.cirrus.com>
To:     <broonie@...nel.org>
CC:     <patches@...nsource.cirrus.com>, <linux-kernel@...r.kernel.org>,
        <alsa-devel@...a-project.org>,
        Richard Fitzgerald <rf@...nsource.cirrus.com>
Subject: [PATCH 2/2] ASoC: cs42l42: Remove duplicate control for WNF filter frequency

The driver was defining two ALSA controls that both change the same
register field for the wind noise filter corner frequency. The filter
response has two corners, at different frequencies, and the duplicate
controls most likely were an attempt to be able to set the value using
either of the frequencies.

However, having two controls changing the same field can be problematic
and it is unnecessary. Both frequencies are related to each other so
setting one implies exactly what the other would be.

Removing a control affects user-side code, but there is currently no
known use of the removed control so it would be best to remove it now
before it becomes a problem.

Signed-off-by: Richard Fitzgerald <rf@...nsource.cirrus.com>
Fixes: 2c394ca79604 ("ASoC: Add support for CS42L42 codec")
---
 sound/soc/codecs/cs42l42.c | 10 ----------
 1 file changed, 10 deletions(-)

diff --git a/sound/soc/codecs/cs42l42.c b/sound/soc/codecs/cs42l42.c
index 2db87e3a4dc3..a00dc3c65549 100644
--- a/sound/soc/codecs/cs42l42.c
+++ b/sound/soc/codecs/cs42l42.c
@@ -425,15 +425,6 @@ static SOC_ENUM_SINGLE_DECL(cs42l42_wnf3_freq_enum, CS42L42_ADC_WNF_HPF_CTL,
 			    CS42L42_ADC_WNF_CF_SHIFT,
 			    cs42l42_wnf3_freq_text);
 
-static const char * const cs42l42_wnf05_freq_text[] = {
-	"280Hz", "315Hz", "350Hz", "385Hz",
-	"420Hz", "455Hz", "490Hz", "525Hz"
-};
-
-static SOC_ENUM_SINGLE_DECL(cs42l42_wnf05_freq_enum, CS42L42_ADC_WNF_HPF_CTL,
-			    CS42L42_ADC_WNF_CF_SHIFT,
-			    cs42l42_wnf05_freq_text);
-
 static const struct snd_kcontrol_new cs42l42_snd_controls[] = {
 	/* ADC Volume and Filter Controls */
 	SOC_SINGLE("ADC Notch Switch", CS42L42_ADC_CTL,
@@ -451,7 +442,6 @@ static const struct snd_kcontrol_new cs42l42_snd_controls[] = {
 				CS42L42_ADC_HPF_EN_SHIFT, true, false),
 	SOC_ENUM("HPF Corner Freq", cs42l42_hpf_freq_enum),
 	SOC_ENUM("WNF 3dB Freq", cs42l42_wnf3_freq_enum),
-	SOC_ENUM("WNF 05dB Freq", cs42l42_wnf05_freq_enum),
 
 	/* DAC Volume and Filter Controls */
 	SOC_SINGLE("DACA Invert Switch", CS42L42_DAC_CTL1,
-- 
2.11.0