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

From: Sibi Sankar <sibis@codeaurora.org>
To: viresh.kumar@linaro.org, sboyd@kernel.org, georgi.djakov@linaro.org
Cc: nm@ti.com, linux-arm-msm@vger.kernel.org,
	linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org,
	saravanak@google.com, mka@chromium.org, smasetty@codeaurora.org,
	Sibi Sankar <sibis@codeaurora.org>
Subject: [PATCH] OPP: Check for bandwidth values before creating icc paths
Date: Thu, 28 May 2020 00:54:18 +0530	[thread overview]
Message-ID: <20200527192418.20169-1-sibis@codeaurora.org> (raw)

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 <sibis@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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