linux-kernel - [PATCH v2 11/48] opp: Add dev_pm_opp_find_level

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Date:   Thu, 17 Dec 2020 21:06:01 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Mark Brown <broonie@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Peter Geis <pgwipeout@...il.com>,
        Nicolas Chauvet <kwizart@...il.com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Kevin Hilman <khilman@...nel.org>,
        Peter De Schrijver <pdeschrijver@...dia.com>,
        Viresh Kumar <vireshk@...nel.org>,
        Stephen Boyd <sboyd@...nel.org>,
        Michael Turquette <mturquette@...libre.com>
Cc:     devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-media@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-clk@...r.kernel.org
Subject: [PATCH v2 11/48] opp: Add dev_pm_opp_find_level_ceil()

Add a ceil version of the dev_pm_opp_find_level(). It's handy to have if
levels don't start from 0 in OPP table and zero usually means a minimal
level.

Signed-off-by: Dmitry Osipenko <digetx@...il.com>
---
 drivers/opp/core.c     | 49 ++++++++++++++++++++++++++++++++++++++++++
 include/linux/pm_opp.h |  8 +++++++
 2 files changed, 57 insertions(+)

diff --git a/drivers/opp/core.c b/drivers/opp/core.c
index eab37b3a27bb..0783a4ac819a 100644
--- a/drivers/opp/core.c
+++ b/drivers/opp/core.c
@@ -449,6 +449,55 @@ struct dev_pm_opp *dev_pm_opp_find_level_exact(struct device *dev,
 }
 EXPORT_SYMBOL_GPL(dev_pm_opp_find_level_exact);
 
+/**
+ * dev_pm_opp_find_level_ceil() - search for an rounded up level
+ * @dev:		device for which we do this operation
+ * @level:		level to search for
+ *
+ * Return: Searches for rounded up match in the opp table and returns pointer
+ * to the  matching opp if found, else returns ERR_PTR in case of error and
+ * should be handled using IS_ERR. Error return values can be:
+ * EINVAL:	for bad pointer
+ * ERANGE:	no match found for search
+ * ENODEV:	if device not found in list of registered devices
+ *
+ * The callers are required to call dev_pm_opp_put() for the returned OPP after
+ * use.
+ */
+struct dev_pm_opp *dev_pm_opp_find_level_ceil(struct device *dev,
+					      unsigned int *level)
+{
+	struct opp_table *opp_table;
+	struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE);
+
+	opp_table = _find_opp_table(dev);
+	if (IS_ERR(opp_table)) {
+		int r = PTR_ERR(opp_table);
+
+		dev_err(dev, "%s: OPP table not found (%d)\n", __func__, r);
+		return ERR_PTR(r);
+	}
+
+	mutex_lock(&opp_table->lock);
+
+	list_for_each_entry(temp_opp, &opp_table->opp_list, node) {
+		if (temp_opp->available && temp_opp->level >= *level) {
+			opp = temp_opp;
+			*level = opp->level;
+
+			/* Increment the reference count of OPP */
+			dev_pm_opp_get(opp);
+			break;
+		}
+	}
+
+	mutex_unlock(&opp_table->lock);
+	dev_pm_opp_put_opp_table(opp_table);
+
+	return opp;
+}
+EXPORT_SYMBOL_GPL(dev_pm_opp_find_level_ceil);
+
 static noinline struct dev_pm_opp *_find_freq_ceil(struct opp_table *opp_table,
 						   unsigned long *freq)
 {
diff --git a/include/linux/pm_opp.h b/include/linux/pm_opp.h
index f311a8b2ca04..a17d92d923cc 100644
--- a/include/linux/pm_opp.h
+++ b/include/linux/pm_opp.h
@@ -111,6 +111,8 @@ struct dev_pm_opp *dev_pm_opp_find_freq_exact(struct device *dev,
 					      bool available);
 struct dev_pm_opp *dev_pm_opp_find_level_exact(struct device *dev,
 					       unsigned int level);
+struct dev_pm_opp *dev_pm_opp_find_level_ceil(struct device *dev,
+					      unsigned int *level);
 
 struct dev_pm_opp *dev_pm_opp_find_freq_floor(struct device *dev,
 					      unsigned long *freq);
@@ -228,6 +230,12 @@ static inline struct dev_pm_opp *dev_pm_opp_find_level_exact(struct device *dev,
 	return ERR_PTR(-ENOTSUPP);
 }
 
+static inline struct dev_pm_opp *dev_pm_opp_find_level_ceil(struct device *dev,
+					unsigned int *level)
+{
+	return ERR_PTR(-ENOTSUPP);
+}
+
 static inline struct dev_pm_opp *dev_pm_opp_find_freq_floor(struct device *dev,
 					unsigned long *freq)
 {
-- 
2.29.2