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authorDave Gerlach <d-gerlach@ti.com>2016-09-23 15:07:47 -0500
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2016-09-26 15:13:31 +0200
commita4ee4545932d4b26ec0c190f2ce265de79990c7a (patch)
treea155c293f5c7faf7e5f26ce032df2a4a2ace89ab /drivers/base/power/opp
parent4df27c91893fd13eaa30e9b0bca74f317816f428 (diff)
downloadlinux-a4ee4545932d4b26ec0c190f2ce265de79990c7a.tar.bz2
PM / OPP: Don't support OPP if it provides supported-hw but platform does not
The OPP framework allows each OPP to set a opp-supported-hw property which provides values that are matched against supported_hw values provided by the platform to limit support for certain OPPs on specific hardware. Currently, if the platform does not set supported_hw values, all OPPs are interpreted as supported, even if they have provided their own opp-supported-hw values. If an OPP has provided opp-supported-hw, it is indicating that there is some specific hardware configuration it is supported by. These constraints should be honored, and if no supported_hw has been provided by the platform, there is no way to determine if that OPP is actually supported, so it should be marked as not supported. Signed-off-by: Dave Gerlach <d-gerlach@ti.com> Acked-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/base/power/opp')
-rw-r--r--drivers/base/power/opp/of.c14
1 files changed, 12 insertions, 2 deletions
diff --git a/drivers/base/power/opp/of.c b/drivers/base/power/opp/of.c
index 1dfd3dd92624..5552211e6fcd 100644
--- a/drivers/base/power/opp/of.c
+++ b/drivers/base/power/opp/of.c
@@ -71,8 +71,18 @@ static bool _opp_is_supported(struct device *dev, struct opp_table *opp_table,
u32 version;
int ret;
- if (!opp_table->supported_hw)
- return true;
+ if (!opp_table->supported_hw) {
+ /*
+ * In the case that no supported_hw has been set by the
+ * platform but there is an opp-supported-hw value set for
+ * an OPP then the OPP should not be enabled as there is
+ * no way to see if the hardware supports it.
+ */
+ if (of_find_property(np, "opp-supported-hw", NULL))
+ return false;
+ else
+ return true;
+ }
while (count--) {
ret = of_property_read_u32_index(np, "opp-supported-hw", count,