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| author | Krzysztof Helt <krzysztof.h1@wp.pl> | 2009-10-25 19:45:57 +0100 |
|---|---|---|
| committer | Dave Jones <davej@redhat.com> | 2009-11-24 13:33:33 -0500 |
| commit | db2820dd5445a44b4726f15a2bc89b9ded2503eb (patch) | |
| tree | d33d14e54b6cd9d0f2931a34667dd534025bdd58 /arch/x86 | |
| parent | b8cbe7e82ec8b55d7bbdde66fc69e788fde00dc6 (diff) | |
| download | blackbird-obmc-linux-db2820dd5445a44b4726f15a2bc89b9ded2503eb.tar.gz blackbird-obmc-linux-db2820dd5445a44b4726f15a2bc89b9ded2503eb.zip | |
[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 <krzysztof.h1@wp.pl>
Signed-off-by: Dave Jones <davej@redhat.com>
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/kernel/cpu/cpufreq/powernow-k6.c | 2 |
1 files changed, 1 insertions, 1 deletions
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); |
