[PATCH] ASoC: cs42l43: Disable headphone clamps during type detection

[PATCH] ASoC: cs42l43: Disable headphone clamps during type detection

[Charles Keepax]

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@opensource.cirrus.com>
---
 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 20e6ab6f0d4a..6165ac16c3a9 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

Re: [PATCH] ASoC: cs42l43: Disable headphone clamps during type detection

[Mark Brown]

On Wed, 23 Apr 2025 10:09:44 +0100, Charles Keepax wrote:
> 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.
> 
> 

Applied to

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git for-next

Thanks!

[1/1] ASoC: cs42l43: Disable headphone clamps during type detection
      commit: 70ad2e6bd180f94be030aef56e59693e36d945f3

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark