linux-kernel - [PATCH AUTOSEL 5.14 03/18] ASoC: cs42l42: Ensure 0dB full scale volume is used for headsets

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Message-Id: <20211025165939.1393655-3-sashal@kernel.org>
Date:   Mon, 25 Oct 2021 12:59:16 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Stefan Binding <sbinding@...nsource.cirrus.com>,
        Richard Fitzgerald <rf@...nsource.cirrus.com>,
        Mark Brown <broonie@...nel.org>,
        Sasha Levin <sashal@...nel.org>, james.schulman@...rus.com,
        david.rhodes@...rus.com, lgirdwood@...il.com, perex@...ex.cz,
        tiwai@...e.com, alsa-devel@...a-project.org,
        patches@...nsource.cirrus.com
Subject: [PATCH AUTOSEL 5.14 03/18] ASoC: cs42l42: Ensure 0dB full scale volume is used for headsets

From: Stefan Binding <sbinding@...nsource.cirrus.com>

[ Upstream commit aa18457c4af7a9dad1f2b150b11beae1d8ab57aa ]

Ensure the default 0dB playback path is always used.

The code that set FULL_SCALE_VOL based on LOAD_DET_RCSTAT was
spurious, and resulted in a -6dB attenuation being accidentally
inserted into the playback path.

Signed-off-by: Stefan Binding <sbinding@...nsource.cirrus.com>
Signed-off-by: Richard Fitzgerald <rf@...nsource.cirrus.com>
Link: https://lore.kernel.org/r/20211011144903.28915-1-rf@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 sound/soc/codecs/cs42l42.c | 16 +++-------------
 1 file changed, 3 insertions(+), 13 deletions(-)

diff --git a/sound/soc/codecs/cs42l42.c b/sound/soc/codecs/cs42l42.c
index 99c022be94a6..8838b9a0de8e 100644
--- a/sound/soc/codecs/cs42l42.c
+++ b/sound/soc/codecs/cs42l42.c
@@ -901,7 +901,6 @@ static int cs42l42_mute_stream(struct snd_soc_dai *dai, int mute, int stream)
 	struct snd_soc_component *component = dai->component;
 	struct cs42l42_private *cs42l42 = snd_soc_component_get_drvdata(component);
 	unsigned int regval;
-	u8 fullScaleVol;
 	int ret;
 
 	if (mute) {
@@ -972,20 +971,11 @@ static int cs42l42_mute_stream(struct snd_soc_dai *dai, int mute, int stream)
 		cs42l42->stream_use |= 1 << stream;
 
 		if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
-			/* Read the headphone load */
-			regval = snd_soc_component_read(component, CS42L42_LOAD_DET_RCSTAT);
-			if (((regval & CS42L42_RLA_STAT_MASK) >> CS42L42_RLA_STAT_SHIFT) ==
-			    CS42L42_RLA_STAT_15_OHM) {
-				fullScaleVol = CS42L42_HP_FULL_SCALE_VOL_MASK;
-			} else {
-				fullScaleVol = 0;
-			}
-
-			/* Un-mute the headphone, set the full scale volume flag */
+			/* Un-mute the headphone */
 			snd_soc_component_update_bits(component, CS42L42_HP_CTL,
 						      CS42L42_HP_ANA_AMUTE_MASK |
-						      CS42L42_HP_ANA_BMUTE_MASK |
-						      CS42L42_HP_FULL_SCALE_VOL_MASK, fullScaleVol);
+						      CS42L42_HP_ANA_BMUTE_MASK,
+						      0);
 		}
 	}
 
-- 
2.33.0