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Subject[PATCH RFC 2/4] OPP: Add and export helper to set bandwidth
Date
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@codeaurora.org>
---
drivers/opp/core.c | 46 ++++++++++++++++++++++++++++++++++++++++++
include/linux/pm_opp.h | 6 ++++++
2 files changed, 52 insertions(+)

diff --git a/drivers/opp/core.c b/drivers/opp/core.c
index c85c04dc2c7de..78f42960860d1 100644
--- a/drivers/opp/core.c
+++ b/drivers/opp/core.c
@@ -746,6 +746,52 @@ static int _set_required_opps(struct device *dev,
return ret;
}

+/**
+ * dev_pm_opp_set_bw() - Configures OPP bandwidth levels
+ * @dev: device for which we do this operation
+ * @freq: bandwidth values to set with matching 'freq'
+ *
+ * This configures the bandwidth to the levels specified
+ * by the OPP corresponding to the given frequency.
+ *
+ * Return: 0 on success or a negative error value.
+ */
+int dev_pm_opp_set_bw(struct device *dev, unsigned long freq)
+{
+ struct opp_table *opp_table;
+ struct dev_pm_opp *opp;
+ int ret = 0;
+ int i;
+
+ opp = dev_pm_opp_find_freq_exact(dev, freq, true);
+ if (IS_ERR(opp))
+ return PTR_ERR(opp);
+
+ opp_table = _find_opp_table(dev);
+ if (IS_ERR(opp_table)) {
+ dev_err(dev, "%s: device opp table doesn't exist\n", __func__);
+ ret = PTR_ERR(opp_table);
+ goto put_opp;
+ }
+
+ if (IS_ERR_OR_NULL(opp_table->paths)) {
+ ret = -ENODEV;
+ goto put_opp_table;
+ }
+
+ 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);
+ }
+
+put_opp_table:
+ dev_pm_opp_put_opp_table(opp_table);
+put_opp:
+ dev_pm_opp_put(opp);
+ 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 a17c462974851..1cdc2d0a2b20e 100644
--- a/include/linux/pm_opp.h
+++ b/include/linux/pm_opp.h
@@ -152,6 +152,7 @@ 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, unsigned long freq);
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);
@@ -336,6 +337,11 @@ 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, unsigned long freq)
+{
+ return -ENOTSUPP;
+}
+
static inline int dev_pm_opp_set_sharing_cpus(struct device *cpu_dev, const struct cpumask *cpumask)
{
return -ENOTSUPP;
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project
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