linux-kernel - [PATCH 3/6] OPP: Add and export helper to set bandwidth

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Date:   Thu, 14 May 2020 16:24:16 +0530
From:   Sharat Masetty <smasetty@...eaurora.org>
To:     freedreno@...ts.freedesktop.org, devicetree@...r.kernel.org
Cc:     dri-devel@...edesktop.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org, jcrouse@...eaurora.org,
        georgi.djakov@...aro.org, mka@...omium.org,
        Sibi Sankar <sibis@...eaurora.org>,
        Sharat Masetty <smasetty@...eaurora.org>
Subject: [PATCH 3/6] OPP: Add and export helper to set bandwidth

From: Sibi Sankar <sibis@...eaurora.org>

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>
Signed-off-by: Sharat Masetty <smasetty@...eaurora.org>
---
 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 f42b7c4..0f34077 100644
--- a/drivers/opp/core.c
+++ b/drivers/opp/core.c
@@ -828,6 +828,49 @@ static int _set_required_opps(struct device *dev,
 }

 /**
+ * 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
  * @target_freq: frequency to achieve
diff --git a/include/linux/pm_opp.h b/include/linux/pm_opp.h
index 76f8c6b..04f7fda 100644
--- a/include/linux/pm_opp.h
+++ b/include/linux/pm_opp.h
@@ -156,6 +156,7 @@ struct dev_pm_opp *dev_pm_opp_xlate_opp(struct opp_table *src_table,
 					struct opp_table *dst_table,
 					struct dev_pm_opp *src_opp);
 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);
@@ -354,6 +355,11 @@ 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;
--
2.7.4