linux-kernel - [PATCH v3 02/12] opp: Filter out OPPs based on availability of a required-OPP

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Date:   Mon, 18 Jan 2021 03:55:14 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Mark Brown <broonie@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Peter Geis <pgwipeout@...il.com>,
        Nicolas Chauvet <kwizart@...il.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Kevin Hilman <khilman@...nel.org>,
        Peter De Schrijver <pdeschrijver@...dia.com>,
        Viresh Kumar <vireshk@...nel.org>,
        Stephen Boyd <sboyd@...nel.org>, Nishanth Menon <nm@...com>,
        Yangtao Li <tiny.windzz@...il.com>,
        Matt Merhar <mattmerhar@...tonmail.com>
Cc:     linux-kernel@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-pm@...r.kernel.org
Subject: [PATCH v3 02/12] opp: Filter out OPPs based on availability of a required-OPP

A required OPP may not be available, and thus, all OPPs which are using
this required OPP should be unavailable too.

Tested-by: Peter Geis <pgwipeout@...il.com>
Tested-by: Nicolas Chauvet <kwizart@...il.com>
Tested-by: Matt Merhar <mattmerhar@...tonmail.com>
Signed-off-by: Dmitry Osipenko <digetx@...il.com>
---
 drivers/opp/core.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/opp/core.c b/drivers/opp/core.c
index 48618ff3e99e..7b4d07279638 100644
--- a/drivers/opp/core.c
+++ b/drivers/opp/core.c
@@ -1522,6 +1522,7 @@ int _opp_add(struct device *dev, struct dev_pm_opp *new_opp,
 	     struct opp_table *opp_table, bool rate_not_available)
 {
 	struct list_head *head;
+	unsigned int i;
 	int ret;
 
 	mutex_lock(&opp_table->lock);
@@ -1547,6 +1548,16 @@ int _opp_add(struct device *dev, struct dev_pm_opp *new_opp,
 			 __func__, new_opp->rate);
 	}
 
+	for (i = 0; i < opp_table->required_opp_count; i++) {
+		if (new_opp->required_opps[i]->available)
+			continue;
+
+		new_opp->available = false;
+		dev_warn(dev, "%s: OPP not supported by required OPP %pOF (%lu)\n",
+			 __func__, new_opp->required_opps[i]->np, new_opp->rate);
+		break;
+	}
+
 	return 0;
 }
 
-- 
2.29.2