[PATCH 6.18 19/43] ASoC: cs42l43: Correct handling of 3-pole jack load detection

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

6.18-stable review patch.  If anyone has any objections, please let me know.

------------------

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

[ Upstream commit e77a4081d7e324dfa876a9560b2a78969446ba82 ]

The load detection process for 3-pole jacks requires slightly
updated reference values to ensure an accurate result. Update
the code to apply different tunings for the 3-pole and 4-pole
cases. This also updates the thresholds overall so update the
relevant comments to match.

Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Link: https://patch.msgid.link/20260130150927.2964664-1-ckeepax@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 sound/soc/codecs/cs42l43-jack.c | 37 +++++++++++++++++++++++++++------
 1 file changed, 31 insertions(+), 6 deletions(-)

diff --git a/sound/soc/codecs/cs42l43-jack.c b/sound/soc/codecs/cs42l43-jack.c
index 867e23d4fb8d8..744488f371ea4 100644
--- a/sound/soc/codecs/cs42l43-jack.c
+++ b/sound/soc/codecs/cs42l43-jack.c
@@ -496,7 +496,23 @@ void cs42l43_bias_sense_timeout(struct work_struct *work)
 	pm_runtime_put_autosuspend(priv->dev);
 }
 
-static void cs42l43_start_load_detect(struct cs42l43_codec *priv)
+static const struct reg_sequence cs42l43_3pole_patch[] = {
+	{ 0x4000,	0x00000055 },
+	{ 0x4000,	0x000000AA },
+	{ 0x17420,	0x8500F300 },
+	{ 0x17424,	0x36003E00 },
+	{ 0x4000,	0x00000000 },
+};
+
+static const struct reg_sequence cs42l43_4pole_patch[] = {
+	{ 0x4000,	0x00000055 },
+	{ 0x4000,	0x000000AA },
+	{ 0x17420,	0x7800E600 },
+	{ 0x17424,	0x36003800 },
+	{ 0x4000,	0x00000000 },
+};
+
+static void cs42l43_start_load_detect(struct cs42l43_codec *priv, bool mic)
 {
 	struct cs42l43 *cs42l43 = priv->core;
 
@@ -520,6 +536,15 @@ static void cs42l43_start_load_detect(struct cs42l43_codec *priv)
 			dev_err(priv->dev, "Load detect HP power down timed out\n");
 	}
 
+	if (mic)
+		regmap_multi_reg_write_bypassed(cs42l43->regmap,
+						cs42l43_4pole_patch,
+						ARRAY_SIZE(cs42l43_4pole_patch));
+	else
+		regmap_multi_reg_write_bypassed(cs42l43->regmap,
+						cs42l43_3pole_patch,
+						ARRAY_SIZE(cs42l43_3pole_patch));
+
 	regmap_update_bits(cs42l43->regmap, CS42L43_BLOCK_EN3,
 			   CS42L43_ADC1_EN_MASK | CS42L43_ADC2_EN_MASK, 0);
 	regmap_update_bits(cs42l43->regmap, CS42L43_DACCNFG2, CS42L43_HP_HPF_EN_MASK, 0);
@@ -598,7 +623,7 @@ static int cs42l43_run_load_detect(struct cs42l43_codec *priv, bool mic)
 
 	reinit_completion(&priv->load_detect);
 
-	cs42l43_start_load_detect(priv);
+	cs42l43_start_load_detect(priv, mic);
 	time_left = wait_for_completion_timeout(&priv->load_detect,
 						msecs_to_jiffies(CS42L43_LOAD_TIMEOUT_MS));
 	cs42l43_stop_load_detect(priv);
@@ -622,11 +647,11 @@ static int cs42l43_run_load_detect(struct cs42l43_codec *priv, bool mic)
 	}
 
 	switch (val & CS42L43_AMP3_RES_DET_MASK) {
-	case 0x0: // low impedance
-	case 0x1: // high impedance
+	case 0x0: // < 22 Ohm impedance
+	case 0x1: // < 150 Ohm impedance
+	case 0x2: // < 1000 Ohm impedance
 		return CS42L43_JACK_HEADPHONE;
-	case 0x2: // lineout
-	case 0x3: // Open circuit
+	case 0x3: // > 1000 Ohm impedance
 		return CS42L43_JACK_LINEOUT;
 	default:
 		return -EINVAL;
-- 
2.51.0