cpufreq: Remove ->resolve_freq()

Commit e3c06236 ("cpufreq: add cpufreq_driver_resolve_freq()")
introduced this callback, back in 2016, for drivers that provide the
->target() callback.

The kernel hasn't seen a single user of it in the past 5 years and
it is not likely to be used any time soon.

Remove it for now.
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
[ rjw: Changelog edits ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

Documentation/cpu-freq/cpu-drivers.rst

@@ -58,9 +58,6 @@ And optionally
 
  .driver_data - cpufreq driver specific data.
 
- .resolve_freq - Returns the most appropriate frequency for a target
- frequency. Doesn't change the frequency though.
-
  .get_intermediate and target_intermediate - Used to switch to stable
  frequency while changing CPU frequency.
 

Documentation/translations/zh_CN/cpu-freq/cpu-drivers.rst

@@ -64,8 +64,6 @@ CPUfreq核心层注册一个cpufreq_driver结构体。
 
  .driver_data - cpufreq驱动程序的特定数据。
 
- .resolve_freq - 返回最适合目标频率的频率。不过并不能改变频率。
-
  .get_intermediate 和 target_intermediate - 用于在改变CPU频率时切换到稳定
  的频率。
 

drivers/cpufreq/cpufreq.c

@@ -527,22 +527,17 @@ EXPORT_SYMBOL_GPL(cpufreq_disable_fast_switch);
 static unsigned int __resolve_freq(struct cpufreq_policy *policy,
 		unsigned int target_freq, unsigned int relation)
 {
+	unsigned int idx;
+
 	target_freq = clamp_val(target_freq, policy->min, policy->max);
-	policy->cached_target_freq = target_freq;
 
-	if (cpufreq_driver->target_index) {
-		unsigned int idx;
+	if (!cpufreq_driver->target_index)
+		return target_freq;
 
-		idx = cpufreq_frequency_table_target(policy, target_freq,
-						     relation);
+	idx = cpufreq_frequency_table_target(policy, target_freq, relation);
 	policy->cached_resolved_idx = idx;
+	policy->cached_target_freq = target_freq;
 	return policy->freq_table[idx].frequency;
-	}
-
-	if (cpufreq_driver->resolve_freq)
-		return cpufreq_driver->resolve_freq(policy, target_freq);
-
-	return target_freq;
 }
 
 /**

include/linux/cpufreq.h

@@ -330,15 +330,6 @@ struct cpufreq_driver {
 				       unsigned long target_perf,
 				       unsigned long capacity);
 
-	/*
-	 * Caches and returns the lowest driver-supported frequency greater than
-	 * or equal to the target frequency, subject to any driver limitations.
-	 * Does not set the frequency. Only to be implemented for drivers with
-	 * target().
-	 */
-	unsigned int	(*resolve_freq)(struct cpufreq_policy *policy,
-					unsigned int target_freq);
-
 	/*
 	 * Only for drivers with target_index() and CPUFREQ_ASYNC_NOTIFICATION
 	 * unset.