linux-kernel - [PATCH v4 3/4] OPP: Add api to retrieve opps which is at most the provided level

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Message-Id: <1692717141-32743-4-git-send-email-quic_krichai@quicinc.com>
Date:   Tue, 22 Aug 2023 20:42:20 +0530
From:   Krishna chaitanya chundru <quic_krichai@...cinc.com>
To:     manivannan.sadhasivam@...aro.org
Cc:     helgaas@...nel.org, linux-pci@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        quic_vbadigan@...cinc.com, quic_nitegupt@...cinc.com,
        quic_skananth@...cinc.com, quic_ramkri@...cinc.com,
        quic_parass@...cinc.com, krzysztof.kozlowski@...aro.org,
        Krishna chaitanya chundru <quic_krichai@...cinc.com>,
        Viresh Kumar <vireshk@...nel.org>, Nishanth Menon <nm@...com>,
        Stephen Boyd <sboyd@...nel.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        linux-pm@...r.kernel.org (open list:OPERATING PERFORMANCE POINTS (OPP))
Subject: [PATCH v4 3/4] OPP: Add api to retrieve opps which is at most the provided level

Add dev_pm_opp_find_level_floor() for searching a lesser match or
operating on OPP in the order of decreasing level.

Signed-off-by: Krishna chaitanya chundru <quic_krichai@...cinc.com>
---
 drivers/opp/core.c     | 26 ++++++++++++++++++++++++++
 include/linux/pm_opp.h |  4 ++++
 2 files changed, 30 insertions(+)

diff --git a/drivers/opp/core.c b/drivers/opp/core.c
index 954c948..e668cf2 100644
--- a/drivers/opp/core.c
+++ b/drivers/opp/core.c
@@ -727,6 +727,32 @@ struct dev_pm_opp *dev_pm_opp_find_level_ceil(struct device *dev,
 }
 EXPORT_SYMBOL_GPL(dev_pm_opp_find_level_ceil);
 
+
+/**
+ * dev_pm_opp_find_level_floor() - Search for a rounded floor freq
+ * @dev:	device for which we do this operation
+ * @freq:	Start level
+ *
+ * Search for the matching floor *available* OPP from a starting level
+ * for a device.
+ *
+ * Return: matching *opp and refreshes *level accordingly, 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_floor(struct device *dev,
+					      unsigned long *level)
+{
+	return _find_key_floor(dev, level, 0, true, _read_level, NULL);
+}
+EXPORT_SYMBOL_GPL(dev_pm_opp_find_level_floor);
+
 /**
  * dev_pm_opp_find_bw_ceil() - Search for a rounded ceil bandwidth
  * @dev:	device for which we do this operation
diff --git a/include/linux/pm_opp.h b/include/linux/pm_opp.h
index dc1fb58..a3bc386 100644
--- a/include/linux/pm_opp.h
+++ b/include/linux/pm_opp.h
@@ -128,6 +128,8 @@ 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_level_floor(struct device *dev,
+					      unsigned long *level);
 
 struct dev_pm_opp *dev_pm_opp_find_freq_ceil(struct device *dev,
 					     unsigned long *freq);
@@ -285,6 +287,8 @@ static inline struct dev_pm_opp *dev_pm_opp_find_bw_ceil(struct device *dev,
 
 static inline struct dev_pm_opp *dev_pm_opp_find_bw_floor(struct device *dev,
 					unsigned int *bw, int index)
+static inline struct dev_pm_opp *dev_pm_opp_find_level_floor(struct device *dev,
+					unsigned long *level)
 {
 	return ERR_PTR(-EOPNOTSUPP);
 }
-- 
2.7.4