power: regulator: Only run autoset once for each regulator

With the commit 4fcba5d ("regulator: implement basic reference
counter"), keeping regulator enablement in balance become more important.
Calling regulator_autoset multiple times on a fixed regulator increase
the enable count for each call, resulting in an unbalanced enable count.

Introduce a AUTOSET_DONE flag and use it to mark that autoset has run
for the regulator. Return -EALREADY on any subsequent call to autoset.

This fixes so that the enable count is only ever increased by one per
regulator for autoset.

Fixes: 4fcba5d ("regulator: implement basic reference counter")
Signed-off-by: Jonas Karlman <jonas@kwiboo.se>

drivers/power/regulator/regulator-uclass.c

@@ -293,6 +293,9 @@ int regulator_autoset(struct udevice *dev)
 
 	uc_pdata = dev_get_uclass_plat(dev);
 
+	if (uc_pdata->flags & REGULATOR_FLAG_AUTOSET_DONE)
+		return -EALREADY;
+
 	ret = regulator_set_suspend_enable(dev, uc_pdata->suspend_on);
 	if (ret == -ENOSYS)
 		ret = 0;
@@ -306,11 +309,15 @@ int regulator_autoset(struct udevice *dev)
 			return ret;
 	}
 
-	if (!uc_pdata->always_on && !uc_pdata->boot_on)
-		return -EMEDIUMTYPE;
+	if (!uc_pdata->always_on && !uc_pdata->boot_on) {
+		ret = -EMEDIUMTYPE;
+		goto out;
+	}
 
-	if (uc_pdata->type == REGULATOR_TYPE_FIXED)
-		return regulator_set_enable(dev, true);
+	if (uc_pdata->type == REGULATOR_TYPE_FIXED) {
+		ret = regulator_set_enable(dev, true);
+		goto out;
+	}
 
 	if (uc_pdata->flags & REGULATOR_FLAG_AUTOSET_UV)
 		ret = regulator_set_value(dev, uc_pdata->min_uV);
@@ -322,6 +329,9 @@ int regulator_autoset(struct udevice *dev)
 	if (!ret)
 		ret = regulator_set_enable(dev, true);
 
+out:
+	uc_pdata->flags |= REGULATOR_FLAG_AUTOSET_DONE;
+
 	return ret;
 }
 

include/power/regulator.h

@@ -134,6 +134,7 @@ struct dm_regulator_mode {
 enum regulator_flag {
 	REGULATOR_FLAG_AUTOSET_UV	= 1 << 0,
 	REGULATOR_FLAG_AUTOSET_UA	= 1 << 1,
+	REGULATOR_FLAG_AUTOSET_DONE	= 1 << 2,
 };
 
 /**