[PATCH 3/3] ASoC: cs42l43: Remove unnecessary work functions

[Charles Keepax <ckeepax@opensource.cirrus.com>]

Now the SoundWire IRQ lock has been changed in the core, it is no longer
necessary to use a bunch of work functions to dodge mutex inversions.

Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
---
 sound/soc/codecs/cs42l43-jack.c | 46 +++++++++++++--------------------
 sound/soc/codecs/cs42l43.c      | 24 ++++-------------
 sound/soc/codecs/cs42l43.h      |  5 ----
 3 files changed, 23 insertions(+), 52 deletions(-)

diff --git a/sound/soc/codecs/cs42l43-jack.c b/sound/soc/codecs/cs42l43-jack.c
index 6165ac16c3a95..72a4150709de8 100644
--- a/sound/soc/codecs/cs42l43-jack.c
+++ b/sound/soc/codecs/cs42l43-jack.c
@@ -362,14 +362,15 @@ static void cs42l43_stop_button_detect(struct cs42l43_codec *priv)
 	priv->button_detect_running = false;
 }
 
+#define CS42L43_BUTTON_COMB_US 11000
 #define CS42L43_BUTTON_COMB_MAX 512
 #define CS42L43_BUTTON_ROUT 2210
 
-void cs42l43_button_press_work(struct work_struct *work)
+irqreturn_t cs42l43_button_press(int irq, void *data)
 {
-	struct cs42l43_codec *priv = container_of(work, struct cs42l43_codec,
-						  button_press_work.work);
+	struct cs42l43_codec *priv = data;
 	struct cs42l43 *cs42l43 = priv->core;
+	irqreturn_t iret = IRQ_NONE;
 	unsigned int buttons = 0;
 	unsigned int val = 0;
 	int i, ret;
@@ -377,7 +378,7 @@ void cs42l43_button_press_work(struct work_struct *work)
 	ret = pm_runtime_resume_and_get(priv->dev);
 	if (ret) {
 		dev_err(priv->dev, "Failed to resume for button press: %d\n", ret);
-		return;
+		return iret;
 	}
 
 	mutex_lock(&priv->jack_lock);
@@ -387,6 +388,9 @@ void cs42l43_button_press_work(struct work_struct *work)
 		goto error;
 	}
 
+	// Wait for 2 full cycles of comb filter to ensure good reading
+	usleep_range(2 * CS42L43_BUTTON_COMB_US, 2 * CS42L43_BUTTON_COMB_US + 50);
+
 	regmap_read(cs42l43->regmap, CS42L43_DETECT_STATUS_1, &val);
 
 	/* Bail if jack removed, the button is irrelevant and likely invalid */
@@ -420,34 +424,27 @@ void cs42l43_button_press_work(struct work_struct *work)
 
 	snd_soc_jack_report(priv->jack_hp, buttons, CS42L43_JACK_BUTTONS);
 
+	iret = IRQ_HANDLED;
+
 error:
 	mutex_unlock(&priv->jack_lock);
 
 	pm_runtime_mark_last_busy(priv->dev);
 	pm_runtime_put_autosuspend(priv->dev);
-}
-
-irqreturn_t cs42l43_button_press(int irq, void *data)
-{
-	struct cs42l43_codec *priv = data;
-
-	// Wait for 2 full cycles of comb filter to ensure good reading
-	queue_delayed_work(system_wq, &priv->button_press_work,
-			   msecs_to_jiffies(20));
 
-	return IRQ_HANDLED;
+	return iret;
 }
 
-void cs42l43_button_release_work(struct work_struct *work)
+irqreturn_t cs42l43_button_release(int irq, void *data)
 {
-	struct cs42l43_codec *priv = container_of(work, struct cs42l43_codec,
-						  button_release_work);
+	struct cs42l43_codec *priv = data;
+	irqreturn_t iret = IRQ_NONE;
 	int ret;
 
 	ret = pm_runtime_resume_and_get(priv->dev);
 	if (ret) {
 		dev_err(priv->dev, "Failed to resume for button release: %d\n", ret);
-		return;
+		return iret;
 	}
 
 	mutex_lock(&priv->jack_lock);
@@ -456,6 +453,8 @@ void cs42l43_button_release_work(struct work_struct *work)
 		dev_dbg(priv->dev, "Button release IRQ\n");
 
 		snd_soc_jack_report(priv->jack_hp, 0, CS42L43_JACK_BUTTONS);
+
+		iret = IRQ_HANDLED;
 	} else {
 		dev_dbg(priv->dev, "Spurious button release IRQ\n");
 	}
@@ -464,15 +463,8 @@ void cs42l43_button_release_work(struct work_struct *work)
 
 	pm_runtime_mark_last_busy(priv->dev);
 	pm_runtime_put_autosuspend(priv->dev);
-}
 
-irqreturn_t cs42l43_button_release(int irq, void *data)
-{
-	struct cs42l43_codec *priv = data;
-
-	queue_work(system_wq, &priv->button_release_work);
-
-	return IRQ_HANDLED;
+	return iret;
 }
 
 void cs42l43_bias_sense_timeout(struct work_struct *work)
@@ -787,8 +779,6 @@ irqreturn_t cs42l43_tip_sense(int irq, void *data)
 
 	cancel_delayed_work(&priv->bias_sense_timeout);
 	cancel_delayed_work(&priv->tip_sense_work);
-	cancel_delayed_work(&priv->button_press_work);
-	cancel_work(&priv->button_release_work);
 
 	// Ensure delay after suspend is long enough to avoid false detection
 	if (priv->suspend_jack_debounce)
diff --git a/sound/soc/codecs/cs42l43.c b/sound/soc/codecs/cs42l43.c
index ea84ac64c775e..41a0f4529ea1f 100644
--- a/sound/soc/codecs/cs42l43.c
+++ b/sound/soc/codecs/cs42l43.c
@@ -167,13 +167,14 @@ static void cs42l43_hp_ilimit_clear_work(struct work_struct *work)
 	snd_soc_dapm_mutex_unlock(dapm);
 }
 
-static void cs42l43_hp_ilimit_work(struct work_struct *work)
+static irqreturn_t cs42l43_hp_ilimit(int irq, void *data)
 {
-	struct cs42l43_codec *priv = container_of(work, struct cs42l43_codec,
-						  hp_ilimit_work);
+	struct cs42l43_codec *priv = data;
 	struct snd_soc_dapm_context *dapm = snd_soc_component_get_dapm(priv->component);
 	struct cs42l43 *cs42l43 = priv->core;
 
+	dev_dbg(priv->dev, "headphone ilimit IRQ\n");
+
 	snd_soc_dapm_mutex_lock(dapm);
 
 	if (priv->hp_ilimit_count < CS42L43_HP_ILIMIT_MAX_COUNT) {
@@ -183,7 +184,7 @@ static void cs42l43_hp_ilimit_work(struct work_struct *work)
 
 		priv->hp_ilimit_count++;
 		snd_soc_dapm_mutex_unlock(dapm);
-		return;
+		return IRQ_HANDLED;
 	}
 
 	dev_err(priv->dev, "Disabling headphone for %dmS, due to frequent current limit\n",
@@ -218,15 +219,6 @@ static void cs42l43_hp_ilimit_work(struct work_struct *work)
 	priv->hp_ilimited = false;
 
 	snd_soc_dapm_mutex_unlock(dapm);
-}
-
-static irqreturn_t cs42l43_hp_ilimit(int irq, void *data)
-{
-	struct cs42l43_codec *priv = data;
-
-	dev_dbg(priv->dev, "headphone ilimit IRQ\n");
-
-	queue_work(system_long_wq, &priv->hp_ilimit_work);
 
 	return IRQ_HANDLED;
 }
@@ -2159,10 +2151,7 @@ static void cs42l43_component_remove(struct snd_soc_component *component)
 
 	cancel_delayed_work_sync(&priv->bias_sense_timeout);
 	cancel_delayed_work_sync(&priv->tip_sense_work);
-	cancel_delayed_work_sync(&priv->button_press_work);
-	cancel_work_sync(&priv->button_release_work);
 
-	cancel_work_sync(&priv->hp_ilimit_work);
 	cancel_delayed_work_sync(&priv->hp_ilimit_clear_work);
 
 	priv->component = NULL;
@@ -2314,10 +2303,7 @@ static int cs42l43_codec_probe(struct platform_device *pdev)
 
 	INIT_DELAYED_WORK(&priv->tip_sense_work, cs42l43_tip_sense_work);
 	INIT_DELAYED_WORK(&priv->bias_sense_timeout, cs42l43_bias_sense_timeout);
-	INIT_DELAYED_WORK(&priv->button_press_work, cs42l43_button_press_work);
 	INIT_DELAYED_WORK(&priv->hp_ilimit_clear_work, cs42l43_hp_ilimit_clear_work);
-	INIT_WORK(&priv->button_release_work, cs42l43_button_release_work);
-	INIT_WORK(&priv->hp_ilimit_work, cs42l43_hp_ilimit_work);
 
 	pm_runtime_set_autosuspend_delay(priv->dev, 100);
 	pm_runtime_use_autosuspend(priv->dev);
diff --git a/sound/soc/codecs/cs42l43.h b/sound/soc/codecs/cs42l43.h
index 1cd9d8a71c439..3ea36362b11a4 100644
--- a/sound/soc/codecs/cs42l43.h
+++ b/sound/soc/codecs/cs42l43.h
@@ -88,8 +88,6 @@ struct cs42l43_codec {
 
 	struct delayed_work tip_sense_work;
 	struct delayed_work bias_sense_timeout;
-	struct delayed_work button_press_work;
-	struct work_struct button_release_work;
 	struct completion type_detect;
 	struct completion load_detect;
 
@@ -99,7 +97,6 @@ struct cs42l43_codec {
 	int jack_override;
 	bool suspend_jack_debounce;
 
-	struct work_struct hp_ilimit_work;
 	struct delayed_work hp_ilimit_clear_work;
 	bool hp_ilimited;
 	int hp_ilimit_count;
@@ -134,8 +131,6 @@ int cs42l43_set_jack(struct snd_soc_component *component,
 		     struct snd_soc_jack *jack, void *d);
 void cs42l43_bias_sense_timeout(struct work_struct *work);
 void cs42l43_tip_sense_work(struct work_struct *work);
-void cs42l43_button_press_work(struct work_struct *work);
-void cs42l43_button_release_work(struct work_struct *work);
 irqreturn_t cs42l43_bias_detect_clamp(int irq, void *data);
 irqreturn_t cs42l43_button_press(int irq, void *data);
 irqreturn_t cs42l43_button_release(int irq, void *data);
-- 
2.39.5