linux-kernel - [PATCH v2 16/48] opp: Handle missing OPP table in dev_pm_opp_xlate_performance

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Message-Id: <20201217180638.22748-17-digetx@gmail.com>
Date:   Thu, 17 Dec 2020 21:06:06 +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>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Peter Geis <pgwipeout@...il.com>,
        Nicolas Chauvet <kwizart@...il.com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        "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>,
        Michael Turquette <mturquette@...libre.com>
Cc:     devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-media@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-clk@...r.kernel.org
Subject: [PATCH v2 16/48] opp: Handle missing OPP table in dev_pm_opp_xlate_performance_state()

NVIDIA Tegra SoCs have a power domains topology such that child domains
only clamp a power rail, while parent domain controls shared performance
state of the multiple child domains. In this case child's domain doesn't
need to have OPP table. Hence we want to allow children power domains to
pass performance state to the parent domain if child's domain doesn't have
OPP table.

The dev_pm_opp_xlate_performance_state() gets src_table=NULL if a child
power domain doesn't have OPP table and in this case we should pass the
performance state to the parent domain.

Signed-off-by: Dmitry Osipenko <digetx@...il.com>
---
 drivers/opp/core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/opp/core.c b/drivers/opp/core.c
index 625dae7a5ecb..34f7e530d941 100644
--- a/drivers/opp/core.c
+++ b/drivers/opp/core.c
@@ -2255,7 +2255,7 @@ int dev_pm_opp_xlate_performance_state(struct opp_table *src_table,
 	 * and so none of them have the "required-opps" property set. Return the
 	 * pstate of the src_table as it is in such cases.
 	 */
-	if (!src_table->required_opp_count)
+	if (!src_table || !src_table->required_opp_count)
 		return pstate;
 
 	for (i = 0; i < src_table->required_opp_count; i++) {
-- 
2.29.2