On Fri, Oct 05, 2018 at 12:06:06PM +0530, Sharat Masetty wrote:
>
>
> On 8/27/2018 8:41 PM, Jordan Crouse wrote:
> >Add dev_pm_opp_get_interconnect_bw() to read the interconnect
> >bandwidth values for a given OPP.
> >
> >Signed-off-by: Jordan Crouse <jcrouse@xxxxxxxxxxxxxx>
> >---
> > drivers/opp/of.c | 36 ++++++++++++++++++++++++++++++++++++
> > include/linux/pm_opp.h | 7 +++++++
> > 2 files changed, 43 insertions(+)
> >
> >diff --git a/drivers/opp/of.c b/drivers/opp/of.c
> >index 7af0ddec936b..6a5eecaaf8c1 100644
> >--- a/drivers/opp/of.c
> >+++ b/drivers/opp/of.c
> >@@ -777,3 +777,39 @@ struct device_node *dev_pm_opp_get_of_node(struct dev_pm_opp *opp)
> > return of_node_get(opp->np);
> > }
> > EXPORT_SYMBOL_GPL(dev_pm_opp_get_of_node);
> >+
> >+/**
> >+ * dev_pm_opp_get_interconnect_bw() - Get the interconnect bandwidth for the opp
> >+ * @opp: opp containing the bandwidth values
> >+ * @pathname: name of the interconnect path for the bandwidth values
> >+ * @avgbw: Pointer for the value to hold the average BW defined for the OPP
> >+ * @peakbw: Pointer for the value to hold the peak BW defined for the OPP
> >+ *
> >+ * Return: Negative value on error or 0 on success
> >+ */
> >+int dev_pm_opp_get_interconnect_bw(struct dev_pm_opp *opp,
> >+ const char *pathname, u64 *avgbw, u64 *peakbw)
> >+{
> >+ char name[NAME_MAX];
> >+ struct property *prop;
> >+ int count;
> >+
> >+ if (IS_ERR_OR_NULL(opp))
> >+ return -ENOENT;
> >+
> >+ snprintf(name, NAME_MAX, "opp-interconnect-bw-%s", pathname);
> >+ prop = of_find_property(opp->np, name, NULL);
> >+
> >+ if (!prop)
> >+ return -ENOENT;
> >+
> >+ count = of_property_count_u64_elems(opp->np, name);
> >+ if (count != 2)
> >+ return -EINVAL;
> >+
> >+ of_property_read_u64_index(opp->np, name, 0, avgbw);
> >+ of_property_read_u64_index(opp->np, name, 0, peakbw);
> This should be index 1 for peak bandwidth
> of_property_read_u64_index(opp->np, name, 1, peakbw);
> I tested with this fix and the GPU's interconnect summary now shows
> non zero values for peak bandwidth. Can you please raise a newer
> version of this patch? I will have it pulled into our downstream
> builds.
Ahhh! I can generate a new one but I think we should come to an agreement on the
bindings.
Jordan
> >+
> >+ return 0;
> >+}
> >+EXPORT_SYMBOL_GPL(dev_pm_opp_get_interconnect_bw);
> >diff --git a/include/linux/pm_opp.h b/include/linux/pm_opp.h
> >index 099b31960dec..70e49e259d0e 100644
> >--- a/include/linux/pm_opp.h
> >+++ b/include/linux/pm_opp.h
> >@@ -301,6 +301,7 @@ int dev_pm_opp_of_get_sharing_cpus(struct device *cpu_dev, struct cpumask *cpuma
> > struct device_node *dev_pm_opp_of_get_opp_desc_node(struct device *dev);
> > struct dev_pm_opp *of_dev_pm_opp_find_required_opp(struct device *dev, struct device_node *np);
> > struct device_node *dev_pm_opp_get_of_node(struct dev_pm_opp *opp);
> >+int dev_pm_opp_get_interconnect_bw(struct dev_pm_opp *opp, const char *pathname, u64 *avgbw, u64 *peakbw);
> > #else
> > static inline int dev_pm_opp_of_add_table(struct device *dev)
> > {
> >@@ -343,6 +344,12 @@ static inline struct device_node *dev_pm_opp_get_of_node(struct dev_pm_opp *opp)
> > {
> > return NULL;
> > }
> >+
> >+static inline int dev_pm_opp_get_interconnect_bw(struct dev_pm_opp *opp, const char *pathname,
> >+ u64 *avgbw, u64 *peakbw)
> >+{
> >+ return -ENOTSUPP;
> >+}
> > #endif
> > #endif /* __LINUX_OPP_H__ */
> >
>
> --
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> Linux Foundation Collaborative Project
--
The Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project
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