linux-kernel - [PATCH AUTOSEL 6.14 08/20] ASoC: cs42l43: Disable headphone clamps during type detection

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Message-Id: <20250506213523.2982756-8-sashal@kernel.org>
Date: Tue,  6 May 2025 17:35:11 -0400
From: Sasha Levin <sashal@...nel.org>
To: patches@...ts.linux.dev,
	stable@...r.kernel.org
Cc: Charles Keepax <ckeepax@...nsource.cirrus.com>,
	Mark Brown <broonie@...nel.org>,
	Sasha Levin <sashal@...nel.org>,
	david.rhodes@...rus.com,
	rf@...nsource.cirrus.com,
	lgirdwood@...il.com,
	perex@...ex.cz,
	tiwai@...e.com,
	linux-sound@...r.kernel.org,
	patches@...nsource.cirrus.com,
	linux-kernel@...r.kernel.org
Subject: [PATCH AUTOSEL 6.14 08/20] ASoC: cs42l43: Disable headphone clamps during type detection

From: Charles Keepax <ckeepax@...nsource.cirrus.com>

[ Upstream commit 70ad2e6bd180f94be030aef56e59693e36d945f3 ]

The headphone clamps cause fairly loud pops during type detect
because they sink current from the detection process itself. Disable
the clamps whilst the type detect runs, to improve the detection
pop performance.

Signed-off-by: Charles Keepax <ckeepax@...nsource.cirrus.com>
Link: https://patch.msgid.link/20250423090944.1504538-1-ckeepax@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 sound/soc/codecs/cs42l43-jack.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/sound/soc/codecs/cs42l43-jack.c b/sound/soc/codecs/cs42l43-jack.c
index 20e6ab6f0d4ad..6165ac16c3a95 100644
--- a/sound/soc/codecs/cs42l43-jack.c
+++ b/sound/soc/codecs/cs42l43-jack.c
@@ -654,6 +654,10 @@ static int cs42l43_run_type_detect(struct cs42l43_codec *priv)
 
 	reinit_completion(&priv->type_detect);
 
+	regmap_update_bits(cs42l43->regmap, CS42L43_STEREO_MIC_CLAMP_CTRL,
+			   CS42L43_SMIC_HPAMP_CLAMP_DIS_FRC_VAL_MASK,
+			   CS42L43_SMIC_HPAMP_CLAMP_DIS_FRC_VAL_MASK);
+
 	cs42l43_start_hs_bias(priv, true);
 	regmap_update_bits(cs42l43->regmap, CS42L43_HS2,
 			   CS42L43_HSDET_MODE_MASK, 0x3 << CS42L43_HSDET_MODE_SHIFT);
@@ -665,6 +669,9 @@ static int cs42l43_run_type_detect(struct cs42l43_codec *priv)
 			   CS42L43_HSDET_MODE_MASK, 0x2 << CS42L43_HSDET_MODE_SHIFT);
 	cs42l43_stop_hs_bias(priv);
 
+	regmap_update_bits(cs42l43->regmap, CS42L43_STEREO_MIC_CLAMP_CTRL,
+			   CS42L43_SMIC_HPAMP_CLAMP_DIS_FRC_VAL_MASK, 0);
+
 	if (!time_left)
 		return -ETIMEDOUT;
 
-- 
2.39.5