From: Krzysztof Helt Date: Sun, 25 Oct 2009 18:45:57 +0000 (+0100) Subject: [CPUFREQ] powernow-k6: set transition latency value so ondemand governor can be used X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=db2820dd5445a44b4726f15a2bc89b9ded2503eb;p=linux-beck.git [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: Krzysztof Helt Signed-off-by: Dave Jones --- diff --git a/arch/x86/kernel/cpu/cpufreq/powernow-k6.c b/arch/x86/kernel/cpu/cpufreq/powernow-k6.c index f10dea409f40..cb01dac267d3 100644 --- a/arch/x86/kernel/cpu/cpufreq/powernow-k6.c +++ b/arch/x86/kernel/cpu/cpufreq/powernow-k6.c @@ -164,7 +164,7 @@ static int powernow_k6_cpu_init(struct cpufreq_policy *policy) } /* cpuinfo and default policy values */ - policy->cpuinfo.transition_latency = CPUFREQ_ETERNAL; + policy->cpuinfo.transition_latency = 200000; policy->cur = busfreq * max_multiplier; result = cpufreq_frequency_table_cpuinfo(policy, clock_ratio);