linux-kernel - [PATCH V2 07/13] OPP: Compare bandwidths for all paths in _opp_compare

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Date:   Tue,  5 Jul 2022 12:30:10 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Viresh Kumar <vireshk@...nel.org>, Nishanth Menon <nm@...com>,
        Stephen Boyd <sboyd@...nel.org>
Cc:     Viresh Kumar <viresh.kumar@...aro.org>, linux-pm@...r.kernel.org,
        Vincent Guittot <vincent.guittot@...aro.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        linux-kernel@...r.kernel.org
Subject: [PATCH V2 07/13] OPP: Compare bandwidths for all paths in _opp_compare_key()

Replicate the same behavior as "rates" here and compare all values
instead of relying on the first entry alone.

Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
---
 drivers/opp/core.c | 20 +++++++++++++++++---
 1 file changed, 17 insertions(+), 3 deletions(-)

diff --git a/drivers/opp/core.c b/drivers/opp/core.c
index 003cd48123d7..261f5e1abfe1 100644
--- a/drivers/opp/core.c
+++ b/drivers/opp/core.c
@@ -1683,6 +1683,20 @@ static int _opp_compare_rate(struct opp_table *opp_table,
 	return 0;
 }
 
+static int _opp_compare_bw(struct opp_table *opp_table, struct dev_pm_opp *opp1,
+			   struct dev_pm_opp *opp2)
+{
+	int i;
+
+	for (i = 0; i < opp_table->path_count; i++) {
+		if (opp1->bandwidth[i].peak != opp2->bandwidth[i].peak)
+			return opp1->bandwidth[i].peak < opp2->bandwidth[i].peak ? -1 : 1;
+	}
+
+	/* Same bw for both OPPs */
+	return 0;
+}
+
 /*
  * Returns
  * 0: opp1 == opp2
@@ -1698,9 +1712,9 @@ int _opp_compare_key(struct opp_table *opp_table, struct dev_pm_opp *opp1,
 	if (ret)
 		return ret;
 
-	if (opp1->bandwidth && opp2->bandwidth &&
-	    opp1->bandwidth[0].peak != opp2->bandwidth[0].peak)
-		return opp1->bandwidth[0].peak < opp2->bandwidth[0].peak ? -1 : 1;
+	ret = _opp_compare_bw(opp_table, opp1, opp2);
+	if (ret)
+		return ret;
 
 	if (opp1->level != opp2->level)
 		return opp1->level < opp2->level ? -1 : 1;
-- 
2.31.1.272.g89b43f80a514