• Steve Muckle's avatar
    cpufreq: add cpufreq_driver_resolve_freq() · e3c06236
    Steve Muckle authored
    Cpufreq governors may need to know what a particular target frequency
    maps to in the driver without necessarily wanting to set the frequency.
    Support this operation via a new cpufreq API,
    cpufreq_driver_resolve_freq(). This API returns the lowest driver
    frequency equal or greater than the target frequency
    (CPUFREQ_RELATION_L), subject to any policy (min/max) or driver
    limitations. The mapping is also cached in the policy so that a
    subsequent fast_switch operation can avoid repeating the same lookup.
    The API will call a new cpufreq driver callback, resolve_freq(), if it
    has been registered by the driver. Otherwise the frequency is resolved
    via cpufreq_frequency_table_target(). Rather than require ->target()
    style drivers to provide a resolve_freq() callback it is left to the
    caller to ensure that the driver implements this callback if necessary
    to use cpufreq_driver_resolve_freq().
    Suggested-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
    Signed-off-by: default avatarSteve Muckle <smuckle@linaro.org>
    Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>