[PATCH] ALSA: hda/tegra: Fix hda Jack detection

[Mohan Kumar]

Tegra HDA Jack detection logic doesn't work when the HDACODEC
in runtime suspended state as unsol event won't be triggered
during D3 state. As pulseaudio server in userspace rely on the
jack mixer control status to show the audio devices in gui and
any display sink device hotplug event during D3 state will never
updates the jack status which will result in no audio device option
available in userspace settings.

The possible option available to resolve this issue for multiple
tegra platforms is to use Jack polling method for every 5 seconds.
Also to make Jack detection work seamlessly the Jack worker thread
needs to run continuously after HDA sound card registered
irrespective of whether HDMI sink device connected or not, but the
Jack state update call happens only when Codec is not powered on.

Signed-off-by: Mohan Kumar <mkumard at nvidia.com>
---
 sound/pci/hda/hda_tegra.c | 43 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)

diff --git a/sound/pci/hda/hda_tegra.c b/sound/pci/hda/hda_tegra.c
index 2347d0304f93..c92938a47b65 100644
--- a/sound/pci/hda/hda_tegra.c
+++ b/sound/pci/hda/hda_tegra.c
@@ -28,6 +28,7 @@
 
 #include <sound/hda_codec.h>
 #include "hda_controller.h"
+#include "hda_jack.h"
 
 /* Defines for Nvidia Tegra HDA support */
 #define HDA_BAR0           0x8000
@@ -67,6 +68,7 @@
  * is used to update the GCAP register to workaround the issue.
  */
 #define TEGRA194_NUM_SDO_LINES	  4
+#define JACKPOLL_INTERVAL	msecs_to_jiffies(5000)
 
 struct hda_tegra_soc {
 	bool has_hda2codec_2x_reset;
@@ -82,6 +84,7 @@ struct hda_tegra {
 	unsigned int nclocks;
 	void __iomem *regs;
 	struct work_struct probe_work;
+	struct delayed_work jack_work;
 	const struct hda_tegra_soc *soc;
 };
 
@@ -127,8 +130,11 @@ static void hda_tegra_init(struct hda_tegra *hda)
 static int __maybe_unused hda_tegra_suspend(struct device *dev)
 {
 	struct snd_card *card = dev_get_drvdata(dev);
+	struct azx *chip = card->private_data;
+	struct hda_tegra *hda = container_of(chip, struct hda_tegra, chip);
 	int rc;
 
+	cancel_delayed_work_sync(&hda->jack_work);
 	rc = pm_runtime_force_suspend(dev);
 	if (rc < 0)
 		return rc;
@@ -140,6 +146,8 @@ static int __maybe_unused hda_tegra_suspend(struct device *dev)
 static int __maybe_unused hda_tegra_resume(struct device *dev)
 {
 	struct snd_card *card = dev_get_drvdata(dev);
+	struct azx *chip = card->private_data;
+	struct hda_tegra *hda = container_of(chip, struct hda_tegra, chip);
 	int rc;
 
 	rc = pm_runtime_force_resume(dev);
@@ -147,6 +155,8 @@ static int __maybe_unused hda_tegra_resume(struct device *dev)
 		return rc;
 	snd_power_change_state(card, SNDRV_CTL_POWER_D0);
 
+	schedule_delayed_work(&hda->jack_work, JACKPOLL_INTERVAL);
+
 	return 0;
 }
 
@@ -209,6 +219,29 @@ static const struct dev_pm_ops hda_tegra_pm = {
 			   NULL)
 };
 
+static void  hda_tegra_jack_work(struct work_struct *work)
+{
+	struct hda_tegra *hda =
+			container_of(work, struct hda_tegra, jack_work.work);
+	struct azx *chip = &hda->chip;
+	struct hda_codec *codec;
+
+	if (!chip->running)
+		return;
+
+	list_for_each_codec(codec, &chip->bus) {
+		if (snd_hdac_is_power_on(&codec->core))
+			continue;
+
+		snd_hda_power_up_pm(codec);
+		snd_hda_jack_set_dirty_all(codec);
+		snd_hda_jack_poll_all(codec);
+		snd_hda_power_down_pm(codec);
+	}
+
+	schedule_delayed_work(&hda->jack_work, JACKPOLL_INTERVAL);
+}
+
 static int hda_tegra_dev_disconnect(struct snd_device *device)
 {
 	struct azx *chip = device->device_data;
@@ -226,6 +259,7 @@ static int hda_tegra_dev_free(struct snd_device *device)
 	struct hda_tegra *hda = container_of(chip, struct hda_tegra, chip);
 
 	cancel_work_sync(&hda->probe_work);
+	cancel_delayed_work_sync(&hda->jack_work);
 	if (azx_bus(chip)->chip_init) {
 		azx_stop_all_streams(chip);
 		azx_stop_chip(chip);
@@ -428,6 +462,7 @@ static int hda_tegra_create(struct snd_card *card,
 	chip->snoop = true;
 
 	INIT_WORK(&hda->probe_work, hda_tegra_probe_work);
+	INIT_DELAYED_WORK(&hda->jack_work, hda_tegra_jack_work);
 
 	err = azx_bus_init(chip, NULL);
 	if (err < 0)
@@ -574,13 +609,18 @@ static void hda_tegra_probe_work(struct work_struct *work)
 
  out_free:
 	pm_runtime_put(hda->dev);
+	schedule_delayed_work(&hda->jack_work, JACKPOLL_INTERVAL);
 	return; /* no error return from async probe */
 }
 
 static int hda_tegra_remove(struct platform_device *pdev)
 {
+	struct snd_card *card = dev_get_drvdata(&pdev->dev);
+	struct azx *chip = card->private_data;
+	struct hda_tegra *hda = container_of(chip, struct hda_tegra, chip);
 	int ret;
 
+	cancel_delayed_work_sync(&hda->jack_work);
 	ret = snd_card_free(dev_get_drvdata(&pdev->dev));
 	pm_runtime_disable(&pdev->dev);
 
@@ -591,10 +631,13 @@ static void hda_tegra_shutdown(struct platform_device *pdev)
 {
 	struct snd_card *card = dev_get_drvdata(&pdev->dev);
 	struct azx *chip;
+	struct hda_tegra *hda;
 
 	if (!card)
 		return;
 	chip = card->private_data;
+	hda = container_of(chip, struct hda_tegra, chip);
+	cancel_delayed_work_sync(&hda->jack_work);
 	if (chip && chip->running)
 		azx_stop_chip(chip);
 }
-- 
2.17.1