Commit 3d737108 authored by Jesse Barnes's avatar Jesse Barnes Committed by Keith Packard
Browse files

cpufreq: expose a cpufreq_quick_get_max routine 



This allows drivers and other code to get the max reported CPU frequency.
Initial use is for scaling ring frequency with GPU frequency in the i915
driver.

Signed-off-by: default avatarJesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: default avatarKeith Packard <keithp@keithp.com>
parent 6ae77e6b

drivers/cpufreq/cpufreq.c

+20 −0
Original line number Diff line number Diff line
@@ -1199,6 +1199,26 @@ unsigned int cpufreq_quick_get(unsigned int cpu) 
}

EXPORT_SYMBOL(cpufreq_quick_get);



/**

 * cpufreq_quick_get_max - get the max reported CPU frequency for this CPU

 * @cpu: CPU number

 *

 * Just return the max possible frequency for a given CPU.

 */

unsigned int cpufreq_quick_get_max(unsigned int cpu)

{

	struct cpufreq_policy *policy = cpufreq_cpu_get(cpu);

	unsigned int ret_freq = 0;



	if (policy) {

		ret_freq = policy->max;

		cpufreq_cpu_put(policy);

	}



	return ret_freq;

}

EXPORT_SYMBOL(cpufreq_quick_get_max);





static unsigned int __cpufreq_get(unsigned int cpu)

{

include/linux/cpufreq.h

+5 −0
Original line number Diff line number Diff line
@@ -324,11 +324,16 @@ static inline unsigned int cpufreq_get(unsigned int cpu) 
/* query the last known CPU freq (in kHz). If zero, cpufreq couldn't detect it */

#ifdef CONFIG_CPU_FREQ

unsigned int cpufreq_quick_get(unsigned int cpu);

unsigned int cpufreq_quick_get_max(unsigned int cpu);

#else

static inline unsigned int cpufreq_quick_get(unsigned int cpu)

{

	return 0;

}

static inline unsigned int cpufreq_quick_get_max(unsigned int cpu)

{

	return 0;

}

#endif