linux-kernel - [PATCH v3 4/7] clk: qcom: gdsc: call runtime PM functions for the provider device

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Date:   Fri,  9 Jul 2021 20:31:59 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Stephen Boyd <sboyd@...nel.org>,
        Taniya Das <tdas@...eaurora.org>,
        Jonathan Marek <jonathan@...ek.ca>,
        Michael Turquette <mturquette@...libre.com>
Cc:     linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-clk@...r.kernel.org,
        Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
        Mark Brown <broonie@...nel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        linux-kernel@...r.kernel.org
Subject: [PATCH v3 4/7] clk: qcom: gdsc: call runtime PM functions for the provider device

In order to properly handle runtime PM status of the provider device,
call pm_runtime_get/pm_runtime_put on the clock controller device.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
---
 drivers/clk/qcom/gdsc.c | 66 ++++++++++++++++++++++++++++++++++++++---
 drivers/clk/qcom/gdsc.h |  2 ++
 2 files changed, 64 insertions(+), 4 deletions(-)

diff --git a/drivers/clk/qcom/gdsc.c b/drivers/clk/qcom/gdsc.c
index ccd36617d067..6bec31fccb09 100644
--- a/drivers/clk/qcom/gdsc.c
+++ b/drivers/clk/qcom/gdsc.c
@@ -11,6 +11,7 @@
 #include <linux/kernel.h>
 #include <linux/ktime.h>
 #include <linux/pm_domain.h>
+#include <linux/pm_runtime.h>
 #include <linux/regmap.h>
 #include <linux/regulator/consumer.h>
 #include <linux/reset-controller.h>
@@ -50,6 +51,30 @@ enum gdsc_status {
 	GDSC_ON
 };
 
+static int gdsc_pm_runtime_get(struct gdsc *sc)
+{
+	int ret;
+
+	if (!sc->rpm_dev)
+		return 0;
+
+	ret = pm_runtime_get_sync(sc->rpm_dev);
+	if (ret < 0) {
+		pm_runtime_put_noidle(sc->rpm_dev);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int gdsc_pm_runtime_put(struct gdsc *sc)
+{
+	if (!sc->rpm_dev)
+		return 0;
+
+	return pm_runtime_put_sync(sc->rpm_dev);
+}
+
 /* Returns 1 if GDSC status is status, 0 if not, and < 0 on error */
 static int gdsc_check_status(struct gdsc *sc, enum gdsc_status status)
 {
@@ -232,9 +257,8 @@ static void gdsc_retain_ff_on(struct gdsc *sc)
 	regmap_update_bits(sc->regmap, sc->gdscr, mask, mask);
 }
 
-static int gdsc_enable(struct generic_pm_domain *domain)
+static int _gdsc_enable(struct gdsc *sc)
 {
-	struct gdsc *sc = domain_to_gdsc(domain);
 	int ret;
 
 	if (sc->pwrsts == PWRSTS_ON)
@@ -290,11 +314,28 @@ static int gdsc_enable(struct generic_pm_domain *domain)
 	return 0;
 }
 
-static int gdsc_disable(struct generic_pm_domain *domain)
+static int gdsc_enable(struct generic_pm_domain *domain)
 {
 	struct gdsc *sc = domain_to_gdsc(domain);
 	int ret;
 
+	ret = gdsc_pm_runtime_get(sc);
+	if (ret)
+		return ret;
+
+	ret = _gdsc_enable(sc);
+	if (ret) {
+		gdsc_pm_runtime_put(sc);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int _gdsc_disable(struct gdsc *sc)
+{
+	int ret;
+
 	if (sc->pwrsts == PWRSTS_ON)
 		return gdsc_assert_reset(sc);
 
@@ -329,6 +370,18 @@ static int gdsc_disable(struct generic_pm_domain *domain)
 	return 0;
 }
 
+static int gdsc_disable(struct generic_pm_domain *domain)
+{
+	struct gdsc *sc = domain_to_gdsc(domain);
+	int ret;
+
+	ret = _gdsc_disable(sc);
+	if (ret)
+		return ret;
+
+	return gdsc_pm_runtime_put(sc);
+}
+
 static int gdsc_init(struct gdsc *sc)
 {
 	u32 mask, val;
@@ -425,6 +478,8 @@ int gdsc_register(struct gdsc_desc *desc,
 	for (i = 0; i < num; i++) {
 		if (!scs[i])
 			continue;
+		if (pm_runtime_enabled(dev))
+			scs[i]->rpm_dev = dev;
 		scs[i]->regmap = regmap;
 		scs[i]->rcdev = rcdev;
 		ret = gdsc_init(scs[i]);
@@ -486,7 +541,10 @@ void gdsc_unregister(struct gdsc_desc *desc)
  */
 int gdsc_gx_do_nothing_enable(struct generic_pm_domain *domain)
 {
+	struct gdsc *sc = domain_to_gdsc(domain);
+
 	/* Do nothing but give genpd the impression that we were successful */
-	return 0;
+	/* Get the runtime PM device only */
+	return gdsc_pm_runtime_get(sc);
 }
 EXPORT_SYMBOL_GPL(gdsc_gx_do_nothing_enable);
diff --git a/drivers/clk/qcom/gdsc.h b/drivers/clk/qcom/gdsc.h
index 5bb396b344d1..a82982df0a55 100644
--- a/drivers/clk/qcom/gdsc.h
+++ b/drivers/clk/qcom/gdsc.h
@@ -25,6 +25,7 @@ struct reset_controller_dev;
  * @resets: ids of resets associated with this gdsc
  * @reset_count: number of @resets
  * @rcdev: reset controller
+ * @rpm_dev: runtime PM device
  */
 struct gdsc {
 	struct generic_pm_domain	pd;
@@ -58,6 +59,7 @@ struct gdsc {
 
 	const char 			*supply;
 	struct regulator		*rsupply;
+	struct device 			*rpm_dev;
 };
 
 struct gdsc_desc {
-- 
2.30.2