Applied "ASoC: codecs: msm8916-wcd-analog: use btn0 released detection" to the asoc tree

[Mark Brown <broonie@kernel.org>]

The patch

   ASoC: codecs: msm8916-wcd-analog: use btn0 released detection

has been applied to the asoc tree at

   git://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git 

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

>From d430a7e3abbf98b4bcb16522cab8e4591775883e Mon Sep 17 00:00:00 2001
From: Damien Riegel <damien.riegel@savoirfairelinux.com>
Date: Wed, 13 Sep 2017 16:43:55 -0400
Subject: [PATCH] ASoC: codecs: msm8916-wcd-analog: use btn0 released detection

msm8916-wcd-analog uses button0 to differentiate between headphone and
headset. Under some circumstances, button pressed and released
interrupts are not fired as the driver expects it.

For instance, with some connectors, there are spurious button-pressed
interrupts when unplugging a headphone, without the corresponding
button-released interrupt. But the codec always alternates between
button pressed and released interrupts, it cannot fire two interrupts of
the same kind in a row. That means that when the headphone is plugged
back, only a button-released interrupt will be fired instead of pressed
then released. This causes the driver to report headphone as headset.

By changing the logic and relying on button 0 release interrupt, the
driver could be made more robust for connectors that differ from the one
used on the Dragonboard's audio mezzanine.

Signed-off-by: Damien Riegel <damien.riegel@savoirfairelinux.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
---
 sound/soc/codecs/msm8916-wcd-analog.c | 18 ++++++++----------
 1 file changed, 8 insertions(+), 10 deletions(-)

diff --git a/sound/soc/codecs/msm8916-wcd-analog.c b/sound/soc/codecs/msm8916-wcd-analog.c
index 549c269acc7d..f562f2d86907 100644
--- a/sound/soc/codecs/msm8916-wcd-analog.c
+++ b/sound/soc/codecs/msm8916-wcd-analog.c
@@ -285,7 +285,7 @@ struct pm8916_wcd_analog_priv {
 	u16 codec_version;
 	bool	mbhc_btn_enabled;
 	/* special event to detect accessory type */
-	bool	mbhc_btn0_pressed;
+	int	mbhc_btn0_released;
 	bool	detect_accessory_type;
 	struct clk *mclk;
 	struct snd_soc_codec *codec;
@@ -483,7 +483,7 @@ static void pm8916_wcd_setup_mbhc(struct pm8916_wcd_analog_priv *wcd)
 
 	snd_soc_update_bits(codec, CDC_D_INT_EN_CLR, int_en_mask, 0);
 	snd_soc_update_bits(codec, CDC_D_INT_EN_SET, int_en_mask, int_en_mask);
-	wcd->mbhc_btn0_pressed = false;
+	wcd->mbhc_btn0_released = false;
 	wcd->detect_accessory_type = true;
 }
 
@@ -950,7 +950,7 @@ static irqreturn_t mbhc_btn_release_irq_handler(int irq, void *arg)
 
 		/* check if its BTN0 thats released */
 		if ((val != -1) && !(val & CDC_A_MBHC_RESULT_1_BTN_RESULT_MASK))
-			priv->mbhc_btn0_pressed = false;
+			priv->mbhc_btn0_released = true;
 
 	} else {
 		snd_soc_jack_report(priv->jack, 0, btn_mask);
@@ -983,9 +983,7 @@ static irqreturn_t mbhc_btn_press_irq_handler(int irq, void *arg)
 		break;
 	case 0x0:
 		/* handle BTN_0 specially for type detection */
-		if (priv->detect_accessory_type)
-			priv->mbhc_btn0_pressed = true;
-		else
+		if (!priv->detect_accessory_type)
 			snd_soc_jack_report(priv->jack,
 					    SND_JACK_BTN_0, btn_mask);
 		break;
@@ -1029,19 +1027,19 @@ static irqreturn_t pm8916_mbhc_switch_irq_handler(int irq, void *arg)
 		 * both press and release event received then its
 		 * a headset.
 		 */
-		if (priv->mbhc_btn0_pressed)
+		if (priv->mbhc_btn0_released)
 			snd_soc_jack_report(priv->jack,
-					    SND_JACK_HEADPHONE, hs_jack_mask);
+					    SND_JACK_HEADSET, hs_jack_mask);
 		else
 			snd_soc_jack_report(priv->jack,
-					    SND_JACK_HEADSET, hs_jack_mask);
+					    SND_JACK_HEADPHONE, hs_jack_mask);
 
 		priv->detect_accessory_type = false;
 
 	} else { /* removal */
 		snd_soc_jack_report(priv->jack, 0, hs_jack_mask);
 		priv->detect_accessory_type = true;
-		priv->mbhc_btn0_pressed = false;
+		priv->mbhc_btn0_released = false;
 	}
 
 	return IRQ_HANDLED;
-- 
2.14.1