diff options
| author | Dave Gerlach <d-gerlach@ti.com> | 2016-09-23 15:07:47 -0500 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2016-09-26 15:13:31 +0200 |
| commit | a4ee4545932d4b26ec0c190f2ce265de79990c7a (patch) | |
| tree | a155c293f5c7faf7e5f26ce032df2a4a2ace89ab /drivers/base | |
| parent | 4df27c91893fd13eaa30e9b0bca74f317816f428 (diff) | |
| download | linux-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')
| -rw-r--r-- | drivers/base/power/opp/of.c | 14 |
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, |