[PATCH] OPP: Check for bandwidth values before creating icc paths

[Sibi Sankar]

Prevent the core from creating and voting on icc paths when the
opp-table does not have the bandwidth values populated. Currently
this check is performed on the first OPP node.

Signed-off-by: Sibi Sankar <si...@codeaurora.org>
---
 drivers/opp/of.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/drivers/opp/of.c b/drivers/opp/of.c
index 61fce1284f012..95cf6f1312765 100644
--- a/drivers/opp/of.c
+++ b/drivers/opp/of.c
@@ -338,6 +338,21 @@ int dev_pm_opp_of_find_icc_paths(struct device *dev,
        struct device_node *np;
        int ret = 0, i, count, num_paths;
        struct icc_path **paths;
+       struct property *prop;
+
+       /* Check for bandwidth values on the first OPP node */
+       if (opp_table && opp_table->np) {
+               np = of_get_next_available_child(opp_table->np, NULL);
+               if (!np) {
+                       dev_err(dev, "Empty OPP table\n");
+                       return 0;
+               }
+
+               prop = of_find_property(np, "opp-peak-kBps", NULL);
+               of_node_put(np);
+               if (!prop || !prop->length)
+                       return 0;
+       }
 
        np = of_node_get(dev->of_node);
        if (!np)
-- 
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