[PATCH] ASoC: rt711/5682: check if bus is active before deferred jack detection

[Pierre-Louis Bossart]

This patch takes a defensive programming and paranoid approach in case
the parent device (SoundWire) is pm_runtime resumed but the rt711
device is not. In that case, during the attachment and initialization,
a jack detection workqueue can be scheduled. Since the pm_runtime
suspend routines will not be invoked, the sequence to cancel all
deferred work is not executed, and the jack detection could happen
after the bus stops operating, leading to a timeout.

This patch applies the same solution to rt5682, based on the
similarities between codec drivers. The race condition with rt5682 was
not detected experimentally though.

BugLink: https://github.com/thesofproject/linux/issues/3459
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart at linux.intel.com>
Reviewed-by: Rander Wang <rander.wang at intel.com>
Reviewed-by: Bard Liao <yung-chuan.liao at linux.intel.com>
---
 sound/soc/codecs/rt5682.c | 9 +++++++++
 sound/soc/codecs/rt711.c  | 7 +++++++
 2 files changed, 16 insertions(+)

diff --git a/sound/soc/codecs/rt5682.c b/sound/soc/codecs/rt5682.c
index c9ff9c89adf7..2b6c6d6b9771 100644
--- a/sound/soc/codecs/rt5682.c
+++ b/sound/soc/codecs/rt5682.c
@@ -1100,6 +1100,15 @@ void rt5682_jack_detect_handler(struct work_struct *work)
 		return;
 	}
 
+	if (rt5682->is_sdw) {
+		if (pm_runtime_status_suspended(rt5682->slave->dev.parent)) {
+			dev_dbg(&rt5682->slave->dev,
+				"%s: parent device is pm_runtime_status_suspended, skipping jack detection\n",
+				__func__);
+			return;
+		}
+	}
+
 	dapm = snd_soc_component_get_dapm(rt5682->component);
 
 	snd_soc_dapm_mutex_lock(dapm);
diff --git a/sound/soc/codecs/rt711.c b/sound/soc/codecs/rt711.c
index 6770825d037a..ea25fd58d43a 100644
--- a/sound/soc/codecs/rt711.c
+++ b/sound/soc/codecs/rt711.c
@@ -245,6 +245,13 @@ static void rt711_jack_detect_handler(struct work_struct *work)
 	if (!rt711->component->card->instantiated)
 		return;
 
+	if (pm_runtime_status_suspended(rt711->slave->dev.parent)) {
+		dev_dbg(&rt711->slave->dev,
+			"%s: parent device is pm_runtime_status_suspended, skipping jack detection\n",
+			__func__);
+		return;
+	}
+
 	reg = RT711_VERB_GET_PIN_SENSE | RT711_HP_OUT;
 	ret = regmap_read(rt711->regmap, reg, &jack_status);
 	if (ret < 0)
-- 
2.30.2