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Commit db2820dd authored by Krzysztof Helt's avatar Krzysztof Helt Committed by Dave Jones
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[CPUFREQ] powernow-k6: set transition latency value so ondemand governor can be used 



Set the transition latency to value smaller than CPUFREQ_ETERNAL so
governors other than "performance" work (like the "ondemand" one).

The value is found in "AMD PowerNow! Technology Platform Design Guide for
Embedded Processors" dated December 2000 (AMD doc #24267A). There is the
answer to one of FAQs on page 40 which states that suggested complete transition
period is 200 us.

Tested on K6-2+ CPU with K6-3 core (model 13, stepping 4).

Signed-off-by: default avatarKrzysztof Helt <krzysztof.h1@wp.pl>
Signed-off-by: default avatarDave Jones <davej@redhat.com>
parent b8cbe7e8

arch/x86/kernel/cpu/cpufreq/powernow-k6.c

+1 −1
Original line number Original line Diff line number Diff line
@@ -164,7 +164,7 @@ static int powernow_k6_cpu_init(struct cpufreq_policy *policy) 
	}

	}





	/* cpuinfo and default policy values */

	/* cpuinfo and default policy values */

	policy->cpuinfo.transition_latency = CPUFREQ_ETERNAL;

	policy->cpuinfo.transition_latency = 200000;

	policy->cur = busfreq * max_multiplier;

	policy->cur = busfreq * max_multiplier;





	result = cpufreq_frequency_table_cpuinfo(policy, clock_ratio);

	result = cpufreq_frequency_table_cpuinfo(policy, clock_ratio);