linux-kernel - [RFC PATCH 4/9] opp: core: Don't warn if required OPP device does not exist

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Date:   Tue, 12 Oct 2021 01:57:02 +0900
From:   Hector Martin <marcan@...can.st>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     Hector Martin <marcan@...can.st>,
        Alyssa Rosenzweig <alyssa@...enzweig.io>,
        Sven Peter <sven@...npeter.dev>, Marc Zyngier <maz@...nel.org>,
        Mark Kettenis <mark.kettenis@...all.nl>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Viresh Kumar <vireshk@...nel.org>, Nishanth Menon <nm@...com>,
        Catalin Marinas <catalin.marinas@....com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Kevin Hilman <khilman@...nel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        linux-clk@...r.kernel.org, devicetree@...r.kernel.org,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [RFC PATCH 4/9] opp: core: Don't warn if required OPP device does not exist

When required-opps is used in CPU OPP tables, there is no parent power
domain to drive it. Squelch this error, to allow a clock driver to
handle this directly instead.

Signed-off-by: Hector Martin <marcan@...can.st>
---
 drivers/opp/core.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/opp/core.c b/drivers/opp/core.c
index 04b4691a8aac..89e616721f70 100644
--- a/drivers/opp/core.c
+++ b/drivers/opp/core.c
@@ -873,12 +873,13 @@ static int _set_required_opp(struct device *dev, struct device *pd_dev,
 		return 0;
 
 	ret = dev_pm_genpd_set_performance_state(pd_dev, pstate);
-	if (ret) {
+	if (ret && ret != -ENODEV) {
 		dev_err(dev, "Failed to set performance rate of %s: %d (%d)\n",
 			dev_name(pd_dev), pstate, ret);
+		return ret;
 	}
 
-	return ret;
+	return 0;
 }
 
 /* This is only called for PM domain for now */
-- 
2.33.0