1 files changed, 42 insertions, 25 deletions

diff --git a/sound/soc/codecs/rt1308-sdw.c b/sound/soc/codecs/rt1308-sdw.c
index f43520ca3187..63d4abf964d4 100644
--- a/sound/soc/codecs/rt1308-sdw.c
+++ b/sound/soc/codecs/rt1308-sdw.c
@@ -52,6 +52,7 @@ static bool rt1308_volatile_register(struct device *dev, unsigned int reg)
 	case 0x300a:
 	case 0xc000:
 	case 0xc710:
+	case 0xcf01:
 	case 0xc860 ... 0xc863:
 	case 0xc870 ... 0xc873:
 		return true;
@@ -213,35 +214,28 @@ static int rt1308_io_init(struct device *dev, struct sdw_slave *slave)
 {
 	struct rt1308_sdw_priv *rt1308 = dev_get_drvdata(dev);
 	int ret = 0;
-	unsigned int tmp;
+	unsigned int tmp, hibernation_flag;
 
 	if (rt1308->hw_init)
 		return 0;
 
-	if (rt1308->first_hw_init) {
-		regcache_cache_only(rt1308->regmap, false);
+	regcache_cache_only(rt1308->regmap, false);
+	if (rt1308->first_hw_init)
 		regcache_cache_bypass(rt1308->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 (!rt1308->first_hw_init) {
-		/* set autosuspend parameters */
-		pm_runtime_set_autosuspend_delay(&slave->dev, 3000);
-		pm_runtime_use_autosuspend(&slave->dev);
-
+	if (!rt1308->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);
 
+	regmap_read(rt1308->regmap, 0xcf01, &hibernation_flag);
+	if ((hibernation_flag != 0x00) && rt1308->first_hw_init)
+		goto _preset_ready_;
+
 	/* sw reset */
 	regmap_write(rt1308->regmap, RT1308_SDW_RESET, 0);
 
@@ -282,6 +276,12 @@ static int rt1308_io_init(struct device *dev, struct sdw_slave *slave)
 	regmap_write(rt1308->regmap, 0xc100, 0xd7);
 	regmap_write(rt1308->regmap, 0xc101, 0xd7);
 
+	/* apply BQ params */
+	rt1308_apply_bq_params(rt1308);
+
+	regmap_write(rt1308->regmap, 0xcf01, 0x01);
+
+_preset_ready_:
 	if (rt1308->first_hw_init) {
 		regcache_cache_bypass(rt1308->regmap, false);
 		regcache_mark_dirty(rt1308->regmap);
@@ -626,6 +626,9 @@ static int rt1308_sdw_component_probe(struct snd_soc_component *component)
 	rt1308->component = component;
 	rt1308_sdw_parse_dt(rt1308, &rt1308->sdw_slave->dev);
 
+	if (!rt1308->first_hw_init)
+		return 0;
+
 	ret = pm_runtime_resume(component->dev);
 	if (ret < 0 && ret != -EACCES)
 		return ret;
@@ -688,6 +691,8 @@ static int rt1308_sdw_init(struct device *dev, struct regmap *regmap,
 	rt1308->sdw_slave = slave;
 	rt1308->regmap = regmap;
 
+	regcache_cache_only(rt1308->regmap, true);
+
 	/*
 	 * Mark hw_init to false
 	 * HW init will be performed when device reports present
@@ -699,10 +704,27 @@ static int rt1308_sdw_init(struct device *dev, struct regmap *regmap,
 				&soc_component_sdw_rt1308,
 				rt1308_sdw_dai,
 				ARRAY_SIZE(rt1308_sdw_dai));
+	if (ret < 0)
+		return ret;
 
-	dev_dbg(&slave->dev, "%s\n", __func__);
+	/* set autosuspend parameters */
+	pm_runtime_set_autosuspend_delay(dev, 3000);
+	pm_runtime_use_autosuspend(dev);
 
-	return ret;
+	/* 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 0;
 }
 
 static int rt1308_sdw_probe(struct sdw_slave *slave,
@@ -715,17 +737,12 @@ static int rt1308_sdw_probe(struct sdw_slave *slave,
 	if (IS_ERR(regmap))
 		return PTR_ERR(regmap);
 
-	rt1308_sdw_init(&slave->dev, regmap, slave);
-
-	return 0;
+	return rt1308_sdw_init(&slave->dev, regmap, slave);
 }
 
 static int rt1308_sdw_remove(struct sdw_slave *slave)
 {
-	struct rt1308_sdw_priv *rt1308 = dev_get_drvdata(&slave->dev);
-
-	if (rt1308->first_hw_init)
-		pm_runtime_disable(&slave->dev);
+	pm_runtime_disable(&slave->dev);
 
 	return 0;
 }