[PATCH] ASoC: da7219: Improve the relability of AAD IRQ process

[David Rau <David.Rau.opensource@dm.renesas.com>]

- Configure the default gound switch delay time before enabling IRQ
  to avoid the unexpected delay time is set up
- Apply DA7219 AAD own work queue to handle AAD events
- Replace msleep with queue_delayed_work to have better relability

This commit improves the control of ground switches in AAD IRQ

Signed-off-by: David Rau <David.Rau.opensource@dm.renesas.com>
---
 sound/soc/codecs/da7219-aad.c | 60 +++++++++++++++++------------------
 sound/soc/codecs/da7219-aad.h |  5 ++-
 2 files changed, 31 insertions(+), 34 deletions(-)

diff --git a/sound/soc/codecs/da7219-aad.c b/sound/soc/codecs/da7219-aad.c
index e3d398b8f54e..993a0d00bc48 100644
--- a/sound/soc/codecs/da7219-aad.c
+++ b/sound/soc/codecs/da7219-aad.c
@@ -342,36 +342,17 @@ static void da7219_aad_hptest_work(struct work_struct *work)
 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);
+		container_of(work, struct da7219_aad_priv, jack_det_work.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;
@@ -392,6 +373,18 @@ static irqreturn_t da7219_aad_irq_thread(int irq, void *data)
 	/* Read status register for jack insertion & type status */
 	statusa = snd_soc_component_read(component, DA7219_ACCDET_STATUS_A);
 
+	if (events[DA7219_AAD_IRQ_REG_A] & DA7219_E_JACK_INSERTED_MASK) {
+		u8 srm_st;
+		int delay = 0;
+
+		srm_st = snd_soc_component_read(component,
+					DA7219_PLL_SRM_STS) & DA7219_PLL_SRM_STS_MCLK;
+		delay = (da7219_aad->gnd_switch_delay * ((srm_st == 0x0) ? 2 : 1) - 2);
+		queue_delayed_work(da7219_aad->aad_wq,
+							&da7219_aad->jack_det_work,
+							msecs_to_jiffies(delay));
+	}
+
 	/* Clear events */
 	regmap_bulk_write(da7219->regmap, DA7219_ACCDET_IRQ_EVENT_A,
 			  events, DA7219_AAD_IRQ_REG_MAX);
@@ -400,9 +393,6 @@ 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] &
@@ -430,9 +420,9 @@ static irqreturn_t da7219_aad_irq_thread(int irq, void *data)
 			if (statusa & DA7219_JACK_TYPE_STS_MASK) {
 				report |= SND_JACK_HEADSET;
 				mask |=	SND_JACK_HEADSET | SND_JACK_LINEOUT;
-				schedule_work(&da7219_aad->btn_det_work);
+				queue_work(da7219_aad->aad_wq, &da7219_aad->btn_det_work);
 			} else {
-				schedule_work(&da7219_aad->hptest_work);
+				queue_work(da7219_aad->aad_wq, &da7219_aad->hptest_work);
 			}
 		}
 
@@ -465,6 +455,7 @@ static irqreturn_t da7219_aad_irq_thread(int irq, void *data)
 			da7219_aad->jack_inserted = false;
 
 			/* Cancel any pending work */
+			cancel_delayed_work_sync(&da7219_aad->jack_det_work);
 			cancel_work_sync(&da7219_aad->btn_det_work);
 			cancel_work_sync(&da7219_aad->hptest_work);
 
@@ -964,13 +955,19 @@ int da7219_aad_init(struct snd_soc_component *component)
 	snd_soc_component_update_bits(component, DA7219_ACCDET_CONFIG_1,
 			    DA7219_BUTTON_CONFIG_MASK, 0);
 
+	da7219_aad_handle_gnd_switch_time(component);
+
+	da7219_aad->aad_wq = create_singlethread_workqueue("da7219-aad");
+	if (!da7219_aad->aad_wq) {
+		dev_err(component->dev, "Failed to create aad workqueue\n");
+		return -ENOMEM;
+	}
+
+	INIT_DELAYED_WORK(&da7219_aad->jack_det_work, da7219_aad_jack_det_work);
 	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);
-
-	mutex_init(&da7219_aad->jack_det_mutex);
 
-	ret = request_threaded_irq(da7219_aad->irq, da7219_aad_pre_irq_thread,
+	ret = request_threaded_irq(da7219_aad->irq, NULL,
 				   da7219_aad_irq_thread,
 				   IRQF_TRIGGER_LOW | IRQF_ONESHOT,
 				   "da7219-aad", da7219_aad);
@@ -984,8 +981,6 @@ int da7219_aad_init(struct snd_soc_component *component)
 	regmap_bulk_write(da7219->regmap, DA7219_ACCDET_IRQ_MASK_A,
 			  &mask, DA7219_AAD_IRQ_REG_MAX);
 
-	da7219_aad_handle_gnd_switch_time(component);
-
 	return 0;
 }
 
@@ -1002,8 +997,10 @@ void da7219_aad_exit(struct snd_soc_component *component)
 
 	free_irq(da7219_aad->irq, da7219_aad);
 
+	cancel_delayed_work_sync(&da7219_aad->jack_det_work);
 	cancel_work_sync(&da7219_aad->btn_det_work);
 	cancel_work_sync(&da7219_aad->hptest_work);
+	destroy_workqueue(da7219_aad->aad_wq);
 }
 
 /*
@@ -1031,4 +1028,5 @@ int da7219_aad_probe(struct i2c_client *i2c)
 
 MODULE_DESCRIPTION("ASoC DA7219 AAD Driver");
 MODULE_AUTHOR("Adam Thomson <Adam.Thomson.Opensource@diasemi.com>");
+MODULE_AUTHOR("David Rau <David.Rau.opensource@dm.renesas.com>");
 MODULE_LICENSE("GPL");
diff --git a/sound/soc/codecs/da7219-aad.h b/sound/soc/codecs/da7219-aad.h
index be87ee47edde..fbfbf3e67918 100644
--- a/sound/soc/codecs/da7219-aad.h
+++ b/sound/soc/codecs/da7219-aad.h
@@ -197,9 +197,8 @@ 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 delayed_work jack_det_work;
+	struct workqueue_struct *aad_wq;
 
 	struct snd_soc_jack *jack;
 	bool micbias_resume_enable;
-- 
2.17.1