ASoC: da7219: Improve the IRQ process to increase the stability

Remove the sleep control in IRQ thread
and create an individual task to handel it for Jack plug in event.

This commit improves the control of ground switches in the AAD IRQ.

Signed-off-by: David Rau <David.Rau.opensource@dm.renesas.com>
Link: https://lore.kernel.org/r/20230215101045.21456-1-David.Rau.opensource@dm.renesas.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: David Rau

sound/soc/codecs/da7219-aad.c

@@ -339,26 +339,49 @@ static void da7219_aad_hptest_work(struct work_struct *work)
 				    SND_JACK_HEADSET | SND_JACK_LINEOUT);
 }
 
+static void da7219_aad_jack_det_work(struct work_struct *work)
+{
+	struct da7219_aad_priv *da7219_aad =
+		container_of(work, struct da7219_aad_priv, jack_det_work);
+	struct snd_soc_component *component = da7219_aad->component;
+	u8 srm_st;
+
+	mutex_lock(&da7219_aad->jack_det_mutex);
+
+	srm_st = snd_soc_component_read(component, DA7219_PLL_SRM_STS) & DA7219_PLL_SRM_STS_MCLK;
+	msleep(da7219_aad->gnd_switch_delay * ((srm_st == 0x0) ? 2 : 1) - 4);
+	/* Enable ground switch */
+	snd_soc_component_update_bits(component, 0xFB, 0x01, 0x01);
+
+	mutex_unlock(&da7219_aad->jack_det_mutex);
+}
+
 
 /*
  * IRQ
  */
 
+static irqreturn_t da7219_aad_pre_irq_thread(int irq, void *data)
+{
+
+	struct da7219_aad_priv *da7219_aad = data;
+
+	if (!da7219_aad->jack_inserted)
+		schedule_work(&da7219_aad->jack_det_work);
+
+	return IRQ_WAKE_THREAD;
+}
+
 static irqreturn_t da7219_aad_irq_thread(int irq, void *data)
 {
 	struct da7219_aad_priv *da7219_aad = data;
 	struct snd_soc_component *component = da7219_aad->component;
 	struct snd_soc_dapm_context *dapm = snd_soc_component_get_dapm(component);
 	struct da7219_priv *da7219 = snd_soc_component_get_drvdata(component);
 	u8 events[DA7219_AAD_IRQ_REG_MAX];
-	u8 statusa, srm_st;
+	u8 statusa;
 	int i, report = 0, mask = 0;
 
-	srm_st = snd_soc_component_read(component, DA7219_PLL_SRM_STS) & DA7219_PLL_SRM_STS_MCLK;
-	msleep(da7219_aad->gnd_switch_delay * ((srm_st == 0x0) ? 2 : 1) - 4);
-	/* Enable ground switch */
-	snd_soc_component_update_bits(component, 0xFB, 0x01, 0x01);
-
 	/* Read current IRQ events */
 	regmap_bulk_read(da7219->regmap, DA7219_ACCDET_IRQ_EVENT_A,
 			 events, DA7219_AAD_IRQ_REG_MAX);
@@ -377,6 +400,9 @@ static irqreturn_t da7219_aad_irq_thread(int irq, void *data)
 		events[DA7219_AAD_IRQ_REG_A], events[DA7219_AAD_IRQ_REG_B],
 		statusa);
 
+	if (!da7219_aad->jack_inserted)
+		cancel_work_sync(&da7219_aad->jack_det_work);
+
 	if (statusa & DA7219_JACK_INSERTION_STS_MASK) {
 		/* Jack Insertion */
 		if (events[DA7219_AAD_IRQ_REG_A] &
@@ -940,8 +966,9 @@ int da7219_aad_init(struct snd_soc_component *component)
 
 	INIT_WORK(&da7219_aad->btn_det_work, da7219_aad_btn_det_work);
 	INIT_WORK(&da7219_aad->hptest_work, da7219_aad_hptest_work);
+	INIT_WORK(&da7219_aad->jack_det_work, da7219_aad_jack_det_work);
 
-	ret = request_threaded_irq(da7219_aad->irq, NULL,
+	ret = request_threaded_irq(da7219_aad->irq, da7219_aad_pre_irq_thread,
 				   da7219_aad_irq_thread,
 				   IRQF_TRIGGER_LOW | IRQF_ONESHOT,
 				   "da7219-aad", da7219_aad);

sound/soc/codecs/da7219-aad.h

@@ -11,6 +11,7 @@
 #define __DA7219_AAD_H
 
 #include <linux/timer.h>
+#include <linux/mutex.h>
 #include <sound/soc.h>
 #include <sound/jack.h>
 #include <sound/da7219-aad.h>
@@ -196,6 +197,9 @@ struct da7219_aad_priv {
 
 	struct work_struct btn_det_work;
 	struct work_struct hptest_work;
+	struct work_struct jack_det_work;
+
+	struct mutex  jack_det_mutex;
 
 	struct snd_soc_jack *jack;
 	bool micbias_resume_enable;