linux-kernel - [PATCH v4 05/12] OPP: Add and export helper to set bandwidth

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Date:   Tue,  5 May 2020 01:52:36 +0530
From:   Sibi Sankar <sibis@...eaurora.org>
To:     viresh.kumar@...aro.org, sboyd@...nel.org,
        georgi.djakov@...aro.org, bjorn.andersson@...aro.org,
        saravanak@...gle.com, mka@...omium.org
Cc:     nm@...com, agross@...nel.org, david.brown@...aro.org,
        robh+dt@...nel.org, mark.rutland@....com, rjw@...ysocki.net,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        dianders@...omium.org, vincent.guittot@...aro.org,
        amit.kucheria@...aro.org, ulf.hansson@...aro.org,
        lukasz.luba@....com, sudeep.holla@....com,
        Sibi Sankar <sibis@...eaurora.org>
Subject: [PATCH v4 05/12] OPP: Add and export helper to set bandwidth

Add and export 'dev_pm_opp_set_bw' to set the bandwidth
levels associated with an OPP for a given frequency.

Signed-off-by: Sibi Sankar <sibis@...eaurora.org>
---

v4:
 https://patchwork.kernel.org/patch/11019737/
 * Pass device opp to set bw levels [Bjorn]

 drivers/opp/core.c     | 43 ++++++++++++++++++++++++++++++++++++++++++
 include/linux/pm_opp.h |  6 ++++++
 2 files changed, 49 insertions(+)

diff --git a/drivers/opp/core.c b/drivers/opp/core.c
index 7f7060079bb28..f157e2d768d76 100644
--- a/drivers/opp/core.c
+++ b/drivers/opp/core.c
@@ -791,6 +791,49 @@ static int _set_required_opps(struct device *dev,
 	return ret;
 }
 
+/**
+ * dev_pm_opp_set_bw() - sets bandwidth levels corresponding to an available opp
+ * @dev:	device for which we do this operation
+ * @opp:	opp based on which the bandwidth levels are to be configured
+ *
+ * This configures the bandwidth to the levels specified
+ * by the OPP.
+ *
+ * Return: 0 on success or a negative error value.
+ */
+int dev_pm_opp_set_bw(struct device *dev, struct dev_pm_opp *opp)
+{
+	struct opp_table *opp_table;
+	int ret = -EINVAL;
+	int i;
+
+	if (IS_ERR_OR_NULL(opp) || !opp->available) {
+		dev_err(dev, "%s: Invalid parameters\n", __func__);
+		return -EINVAL;
+	}
+
+	opp_table = _find_opp_table(dev);
+	if (IS_ERR(opp_table)) {
+		dev_err(dev, "%s: device opp table doesn't exist\n", __func__);
+		return PTR_ERR(opp_table);
+	}
+
+	if (opp_table->paths) {
+		for (i = 0; i < opp_table->path_count; i++) {
+			ret = icc_set_bw(opp_table->paths[i],
+					 opp->bandwidth[i].avg,
+					 opp->bandwidth[i].peak);
+			if (ret)
+				dev_err(dev, "Failed to set bandwidth[%d]: %d\n",
+					i, ret);
+		}
+	}
+
+	dev_pm_opp_put_opp_table(opp_table);
+	return ret;
+}
+EXPORT_SYMBOL_GPL(dev_pm_opp_set_bw);
+
 /**
  * dev_pm_opp_set_rate() - Configure new OPP based on frequency
  * @dev:	 device for which we do this operation
diff --git a/include/linux/pm_opp.h b/include/linux/pm_opp.h
index 639bc0382ee02..87ba295080a2b 100644
--- a/include/linux/pm_opp.h
+++ b/include/linux/pm_opp.h
@@ -154,6 +154,7 @@ struct opp_table *dev_pm_opp_attach_genpd(struct device *dev, const char **names
 void dev_pm_opp_detach_genpd(struct opp_table *opp_table);
 int dev_pm_opp_xlate_performance_state(struct opp_table *src_table, struct opp_table *dst_table, unsigned int pstate);
 int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq);
+int dev_pm_opp_set_bw(struct device *dev, struct dev_pm_opp *opp);
 int dev_pm_opp_set_sharing_cpus(struct device *cpu_dev, const struct cpumask *cpumask);
 int dev_pm_opp_get_sharing_cpus(struct device *cpu_dev, struct cpumask *cpumask);
 void dev_pm_opp_remove_table(struct device *dev);
@@ -352,6 +353,11 @@ static inline int dev_pm_opp_set_rate(struct device *dev, unsigned long target_f
 	return -ENOTSUPP;
 }
 
+static inline int dev_pm_opp_set_bw(struct device *dev, struct dev_pm_opp *opp)
+{
+	return -ENOTSUPP;
+}
+
 static inline int dev_pm_opp_set_sharing_cpus(struct device *cpu_dev, const struct cpumask *cpumask)
 {
 	return -ENOTSUPP;
-- 
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