ASoC: rt5682-sdw: enable pm_runtime in probe, keep status as 'suspended'

This patch suggests enabling pm_runtime during the probe, but marking the
device as 'active' only after it is enumerated. That will force a
dependency between the card and the codec, pm_runtime_get_sync() will
have to wait for the codec device to resume and hence implicitly wait
for the enumeration/initialization to be completed. In the nominal
case where the codec device is already active the get_sync() would
only perform a ref-count increase.

The changes are directly inspired by RT711 and RT711-sdca changes.
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Reviewed-by: Rander Wang <rander.wang@intel.com>
Reviewed-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Link: https://lore.kernel.org/r/20230802153629.53576-15-pierre-louis.bossart@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/rt5682-sdw.c

@@ -339,7 +339,25 @@ static int rt5682_sdw_init(struct device *dev, struct regmap *regmap,
 	ret = devm_snd_soc_register_component(dev,
 					      &rt5682_soc_component_dev,
 					      rt5682_dai, ARRAY_SIZE(rt5682_dai));
-	dev_dbg(&slave->dev, "%s\n", __func__);
+	if (ret < 0)
+		return ret;
+
+	/* set autosuspend parameters */
+	pm_runtime_set_autosuspend_delay(dev, 3000);
+	pm_runtime_use_autosuspend(dev);
+
+	/* make sure the device does not suspend immediately */
+	pm_runtime_mark_last_busy(dev);
+
+	pm_runtime_enable(dev);
+
+	/* important note: the device is NOT tagged as 'active' and will remain
+	 * 'suspended' until the hardware is enumerated/initialized. This is required
+	 * to make sure the ASoC framework use of pm_runtime_get_sync() does not silently
+	 * fail with -EACCESS because of race conditions between card creation and enumeration
+	 */
+
+	dev_dbg(dev, "%s\n", __func__);
 
 	return ret;
 }
@@ -361,22 +379,12 @@ static int rt5682_io_init(struct device *dev, struct sdw_slave *slave)
 		regcache_cache_bypass(rt5682->regmap, true);
 
 	/*
-	 * PM runtime is only enabled when a Slave reports as Attached
+	 * PM runtime status is marked as 'active' only when a Slave reports as Attached
 	 */
-	if (!rt5682->first_hw_init) {
-		/* set autosuspend parameters */
-		pm_runtime_set_autosuspend_delay(&slave->dev, 3000);
-		pm_runtime_use_autosuspend(&slave->dev);
-
+	if (!rt5682->first_hw_init)
 		/* update count of parent 'active' children */
 		pm_runtime_set_active(&slave->dev);
 
-		/* make sure the device does not suspend immediately */
-		pm_runtime_mark_last_busy(&slave->dev);
-
-		pm_runtime_enable(&slave->dev);
-	}
-
 	pm_runtime_get_noresume(&slave->dev);
 
 	while (loop > 0) {
@@ -687,8 +695,7 @@ static int rt5682_sdw_remove(struct sdw_slave *slave)
 	if (rt5682->hw_init)
 		cancel_delayed_work_sync(&rt5682->jack_detect_work);
 
-	if (rt5682->first_hw_init)
-		pm_runtime_disable(&slave->dev);
+	pm_runtime_disable(&slave->dev);
 
 	return 0;
 }

sound/soc/codecs/rt5682.c

@@ -1017,6 +1017,9 @@ static int rt5682_set_jack_detect(struct snd_soc_component *component,
 
 	rt5682->hs_jack = hs_jack;
 
+	if (rt5682->is_sdw && !rt5682->first_hw_init)
+		return 0;
+
 	if (!hs_jack) {
 		regmap_update_bits(rt5682->regmap, RT5682_IRQ_CTRL_2,
 			RT5682_JD1_EN_MASK, RT5682_JD1_DIS);