linux-kernel - [PATCH v8 01/34] opp: Add dev_pm_opp

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Message-Id: <20210817012754.8710-2-digetx@gmail.com>
Date:   Tue, 17 Aug 2021 04:27:21 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Viresh Kumar <vireshk@...nel.org>,
        Stephen Boyd <sboyd@...nel.org>,
        Peter De Schrijver <pdeschrijver@...dia.com>,
        Mikko Perttunen <mperttunen@...dia.com>,
        Peter Chen <peter.chen@...nel.org>,
        Mark Brown <broonie@...nel.org>,
        Lee Jones <lee.jones@...aro.org>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>, Nishanth Menon <nm@...com>,
        Vignesh Raghavendra <vigneshr@...com>,
        Richard Weinberger <richard@....at>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Lucas Stach <dev@...xeye.de>, Stefan Agner <stefan@...er.ch>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Michael Turquette <mturquette@...libre.com>
Cc:     linux-kernel@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-pm@...r.kernel.org, linux-usb@...r.kernel.org,
        linux-staging@...ts.linux.dev, linux-spi@...r.kernel.org,
        linux-pwm@...r.kernel.org, linux-mtd@...ts.infradead.org,
        linux-mmc@...r.kernel.org, linux-media@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-clk@...r.kernel.org
Subject: [PATCH v8 01/34] opp: Add dev_pm_opp_sync() helper

Add dev_pm_opp_sync() helper which syncs OPP table with hardware state
and vice versa.

Signed-off-by: Dmitry Osipenko <digetx@...il.com>
---
 drivers/opp/core.c     | 42 +++++++++++++++++++++++++++++++++++++++---
 include/linux/pm_opp.h |  6 ++++++
 2 files changed, 45 insertions(+), 3 deletions(-)

diff --git a/drivers/opp/core.c b/drivers/opp/core.c
index 5543c54dacc5..18016e49605f 100644
--- a/drivers/opp/core.c
+++ b/drivers/opp/core.c
@@ -939,7 +939,8 @@ static int _set_required_opps(struct device *dev,
 	return ret;
 }
 
-static void _find_current_opp(struct device *dev, struct opp_table *opp_table)
+static struct dev_pm_opp *
+_find_current_opp(struct device *dev, struct opp_table *opp_table)
 {
 	struct dev_pm_opp *opp = ERR_PTR(-ENODEV);
 	unsigned long freq;
@@ -961,7 +962,7 @@ static void _find_current_opp(struct device *dev, struct opp_table *opp_table)
 		mutex_unlock(&opp_table->lock);
 	}
 
-	opp_table->current_opp = opp;
+	return opp;
 }
 
 static int _disable_opp_table(struct device *dev, struct opp_table *opp_table)
@@ -1003,7 +1004,7 @@ static int _set_opp(struct device *dev, struct opp_table *opp_table,
 
 	/* Find the currently set OPP if we don't know already */
 	if (unlikely(!opp_table->current_opp))
-		_find_current_opp(dev, opp_table);
+		opp_table->current_opp = _find_current_opp(dev, opp_table);
 
 	old_opp = opp_table->current_opp;
 
@@ -2931,3 +2932,38 @@ int dev_pm_opp_sync_regulators(struct device *dev)
 	return ret;
 }
 EXPORT_SYMBOL_GPL(dev_pm_opp_sync_regulators);
+
+/**
+ * dev_pm_opp_sync() - Sync OPP state
+ * @dev:	device for which we do this operation
+ *
+ * Initialize OPP table accordingly to current clock rate or
+ * first available OPP if clock not available for this device.
+ *
+ * Return: 0 on success or a negative error value.
+ */
+int dev_pm_opp_sync(struct device *dev)
+{
+	struct opp_table *opp_table;
+	struct dev_pm_opp *opp;
+	int ret = 0;
+
+	/* Device may not have OPP table */
+	opp_table = _find_opp_table(dev);
+	if (IS_ERR(opp_table))
+		return 0;
+
+	if (!_get_opp_count(opp_table))
+		goto put_table;
+
+	opp = _find_current_opp(dev, opp_table);
+	ret = _set_opp(dev, opp_table, opp, opp->rate);
+	dev_pm_opp_put(opp);
+
+put_table:
+	/* Drop reference taken by _find_opp_table() */
+	dev_pm_opp_put_opp_table(opp_table);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(dev_pm_opp_sync);
diff --git a/include/linux/pm_opp.h b/include/linux/pm_opp.h
index 84150a22fd7c..686122b59935 100644
--- a/include/linux/pm_opp.h
+++ b/include/linux/pm_opp.h
@@ -168,6 +168,7 @@ int dev_pm_opp_get_sharing_cpus(struct device *cpu_dev, struct cpumask *cpumask)
 void dev_pm_opp_remove_table(struct device *dev);
 void dev_pm_opp_cpumask_remove_table(const struct cpumask *cpumask);
 int dev_pm_opp_sync_regulators(struct device *dev);
+int dev_pm_opp_sync(struct device *dev);
 #else
 static inline struct opp_table *dev_pm_opp_get_opp_table(struct device *dev)
 {
@@ -434,6 +435,11 @@ static inline int dev_pm_opp_sync_regulators(struct device *dev)
 	return -EOPNOTSUPP;
 }
 
+static inline int dev_pm_opp_sync(struct device *dev)
+{
+	return -EOPNOTSUPP;
+}
+
 #endif		/* CONFIG_PM_OPP */
 
 #if defined(CONFIG_PM_OPP) && defined(CONFIG_OF)
-- 
2.32.0