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[CPUFREQ] powernow-k8: Limit Pstate transition latency check
The Pstate transition latency check was added for broken F10h BIOSen which wrongly contain a value of 0 for transition and bus master latency. Fam11h and later, however, (will) have similar transition latency so extend that behavior for them too. Signed-off-by: Borislav Petkov <borislav.petkov@amd.com> Signed-off-by: Dave Jones <davej@redhat.com>
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1 changed files with 5 additions and 6 deletions
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@ -1023,13 +1023,12 @@ static int get_transition_latency(struct powernow_k8_data *data)
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}
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if (max_latency == 0) {
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/*
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* Fam 11h always returns 0 as transition latency.
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* This is intended and means "very fast". While cpufreq core
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* and governors currently can handle that gracefully, better
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* set it to 1 to avoid problems in the future.
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* For all others it's a BIOS bug.
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* Fam 11h and later may return 0 as transition latency. This
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* is intended and means "very fast". While cpufreq core and
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* governors currently can handle that gracefully, better set it
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* to 1 to avoid problems in the future.
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*/
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if (boot_cpu_data.x86 != 0x11)
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if (boot_cpu_data.x86 < 0x11)
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printk(KERN_ERR FW_WARN PFX "Invalid zero transition "
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"latency\n");
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max_latency = 1;
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