Merge tag '1672656511-1931-1-git-send-email-quic_akhilpo@quicinc.com' into clk-for-6.3

v6.2-rc1 + 1672656511-1931-1-git-send-email-quic_akhilpo@quicinc.com

3 files changed, 37 insertions, 5 deletions

diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
index 967bcf9d415e..84662d338188 100644
--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c
@@ -519,6 +519,31 @@ ktime_t dev_pm_genpd_get_next_hrtimer(struct device *dev)
 }
 EXPORT_SYMBOL_GPL(dev_pm_genpd_get_next_hrtimer);
 
+/*
+ * dev_pm_genpd_synced_poweroff - Next power off should be synchronous
+ *
+ * @dev: A device that is attached to the genpd.
+ *
+ * Allows a consumer of the genpd to notify the provider that the next power off
+ * should be synchronous.
+ *
+ * It is assumed that the users guarantee that the genpd wouldn't be detached
+ * while this routine is getting called.
+ */
+void dev_pm_genpd_synced_poweroff(struct device *dev)
+{
+	struct generic_pm_domain *genpd;
+
+	genpd = dev_to_genpd_safe(dev);
+	if (!genpd)
+		return;
+
+	genpd_lock(genpd);
+	genpd->synced_poweroff = true;
+	genpd_unlock(genpd);
+}
+EXPORT_SYMBOL_GPL(dev_pm_genpd_synced_poweroff);
+
 static int _genpd_power_on(struct generic_pm_domain *genpd, bool timed)
 {
 	unsigned int state_idx = genpd->state_idx;
@@ -562,6 +587,7 @@ static int _genpd_power_on(struct generic_pm_domain *genpd, bool timed)
 
 out:
 	raw_notifier_call_chain(&genpd->power_notifiers, GENPD_NOTIFY_ON, NULL);
+	genpd->synced_poweroff = false;
 	return 0;
 err:
 	raw_notifier_call_chain(&genpd->power_notifiers, GENPD_NOTIFY_OFF,
diff --git a/drivers/clk/qcom/gdsc.c b/drivers/clk/qcom/gdsc.c
index 9e4d6ce891aa..5358e28122ab 100644
--- a/drivers/clk/qcom/gdsc.c
+++ b/drivers/clk/qcom/gdsc.c
@@ -136,7 +136,8 @@ static int gdsc_update_collapse_bit(struct gdsc *sc, bool val)
 	return 0;
 }
 
-static int gdsc_toggle_logic(struct gdsc *sc, enum gdsc_status status)
+static int gdsc_toggle_logic(struct gdsc *sc, enum gdsc_status status,
+		bool wait)
 {
 	int ret;
 
@@ -149,7 +150,7 @@ static int gdsc_toggle_logic(struct gdsc *sc, enum gdsc_status status)
 	ret = gdsc_update_collapse_bit(sc, status == GDSC_OFF);
 
 	/* If disabling votable gdscs, don't poll on status */
-	if ((sc->flags & VOTABLE) && status == GDSC_OFF) {
+	if ((sc->flags & VOTABLE) && status == GDSC_OFF && !wait) {
 		/*
 		 * Add a short delay here to ensure that an enable
 		 * right after it was disabled does not put it in an
@@ -275,7 +276,7 @@ static int gdsc_enable(struct generic_pm_domain *domain)
 		gdsc_deassert_clamp_io(sc);
 	}
 
-	ret = gdsc_toggle_logic(sc, GDSC_ON);
+	ret = gdsc_toggle_logic(sc, GDSC_ON, false);
 	if (ret)
 		return ret;
 
@@ -352,7 +353,7 @@ static int gdsc_disable(struct generic_pm_domain *domain)
 	if (sc->pwrsts == PWRSTS_RET_ON)
 		return 0;
 
-	ret = gdsc_toggle_logic(sc, GDSC_OFF);
+	ret = gdsc_toggle_logic(sc, GDSC_OFF, domain->synced_poweroff);
 	if (ret)
 		return ret;
 
@@ -392,7 +393,7 @@ static int gdsc_init(struct gdsc *sc)
 
 	/* Force gdsc ON if only ON state is supported */
 	if (sc->pwrsts == PWRSTS_ON) {
-		ret = gdsc_toggle_logic(sc, GDSC_ON);
+		ret = gdsc_toggle_logic(sc, GDSC_ON, false);
 		if (ret)
 			return ret;
 	}
diff --git a/include/linux/pm_domain.h b/include/linux/pm_domain.h
index 1cd41bdf73cf..f776fb93eaa0 100644
--- a/include/linux/pm_domain.h
+++ b/include/linux/pm_domain.h
@@ -136,6 +136,7 @@ struct generic_pm_domain {
 	unsigned int prepared_count;	/* Suspend counter of prepared devices */
 	unsigned int performance_state;	/* Aggregated max performance state */
 	cpumask_var_t cpus;		/* A cpumask of the attached CPUs */
+	bool synced_poweroff;		/* A consumer needs a synced poweroff */
 	int (*power_off)(struct generic_pm_domain *domain);
 	int (*power_on)(struct generic_pm_domain *domain);
 	struct raw_notifier_head power_notifiers; /* Power on/off notifiers */
@@ -235,6 +236,7 @@ int dev_pm_genpd_add_notifier(struct device *dev, struct notifier_block *nb);
 int dev_pm_genpd_remove_notifier(struct device *dev);
 void dev_pm_genpd_set_next_wakeup(struct device *dev, ktime_t next);
 ktime_t dev_pm_genpd_get_next_hrtimer(struct device *dev);
+void dev_pm_genpd_synced_poweroff(struct device *dev);
 
 extern struct dev_power_governor simple_qos_governor;
 extern struct dev_power_governor pm_domain_always_on_gov;
@@ -300,6 +302,9 @@ static inline ktime_t dev_pm_genpd_get_next_hrtimer(struct device *dev)
 {
 	return KTIME_MAX;
 }
+static inline void dev_pm_genpd_synced_poweroff(struct device *dev)
+{ }
+
 #define simple_qos_governor		(*(struct dev_power_governor *)(NULL))
 #define pm_domain_always_on_gov		(*(struct dev_power_governor *)(NULL))
 #endif