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author | Ulf Hansson <ulf.hansson@linaro.org> | 2023-09-25 16:17:07 +0300 |
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committer | Viresh Kumar <viresh.kumar@linaro.org> | 2023-10-06 10:07:33 +0300 |
commit | 3fbc5c3b8522d655cf91d32c158261060fdc02fe (patch) | |
tree | c3b6ec0a7ed2cc0e80c716e2c962776932508b90 /drivers/base/power | |
parent | 0bb80ecc33a8fb5a682236443c1e740d5c917d1d (diff) | |
download | linux-3fbc5c3b8522d655cf91d32c158261060fdc02fe.tar.xz |
PM: domains: Introduce dev_pm_domain_set_performance_state()
The generic PM domain is currently the only PM domain variant that supports
performance scaling. To allow performance scaling to be supported through a
common interface, let's add an optional callback ->set_performance_state(),
in the struct dev_pm_domain.
Moreover, let's add a function, dev_pm_domain_set_performance_state(), that
may be called by consumers to request a new performance state for a device
through its PM domain.
Note that, in most cases it's preferred that a consumer use the OPP library
to request a new performance state for its device. Although, this requires
some additional changes to be supported, which are being implemented from
subsequent changes.
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Diffstat (limited to 'drivers/base/power')
-rw-r--r-- | drivers/base/power/common.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/drivers/base/power/common.c b/drivers/base/power/common.c index 72115917e0bd..44ec20918a4d 100644 --- a/drivers/base/power/common.c +++ b/drivers/base/power/common.c @@ -228,3 +228,24 @@ void dev_pm_domain_set(struct device *dev, struct dev_pm_domain *pd) device_pm_check_callbacks(dev); } EXPORT_SYMBOL_GPL(dev_pm_domain_set); + +/** + * dev_pm_domain_set_performance_state - Request a new performance state. + * @dev: The device to make the request for. + * @state: Target performance state for the device. + * + * This function should be called when a new performance state needs to be + * requested for a device that is attached to a PM domain. Note that, the + * support for performance scaling for PM domains is optional. + * + * Returns 0 on success and when performance scaling isn't supported, negative + * error code on failure. + */ +int dev_pm_domain_set_performance_state(struct device *dev, unsigned int state) +{ + if (dev->pm_domain && dev->pm_domain->set_performance_state) + return dev->pm_domain->set_performance_state(dev, state); + + return 0; +} +EXPORT_SYMBOL_GPL(dev_pm_domain_set_performance_state); |