diff options
| author | Len Brown <len.brown@intel.com> | 2009-04-05 01:52:07 -0400 |
|---|---|---|
| committer | Len Brown <len.brown@intel.com> | 2009-04-05 01:52:07 -0400 |
| commit | 8a3f257c704e02aee9869decd069a806b45be3f1 (patch) | |
| tree | adb9d3766c57119381304c3b94334997cc7a74a7 /arch/x86/kernel/cpu/cpufreq | |
| parent | 33526a53600ac887d100e3c9b4be3637ac8ae3a5 (diff) | |
| parent | 15065531c1c5902775ae3ade24eb37d0e688353b (diff) | |
Merge branch 'misc' into release
Diffstat (limited to 'arch/x86/kernel/cpu/cpufreq')
| -rw-r--r-- | arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.c b/arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.c index 4b1c319d30c3..89c676d6caf7 100644 --- a/arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.c +++ b/arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.c @@ -680,6 +680,18 @@ static int acpi_cpufreq_cpu_init(struct cpufreq_policy *policy) perf->states[i].transition_latency * 1000; } + /* Check for high latency (>20uS) from buggy BIOSes, like on T42 */ + if (perf->control_register.space_id == ACPI_ADR_SPACE_FIXED_HARDWARE && + policy->cpuinfo.transition_latency > 20 * 1000) { + static int print_once; + policy->cpuinfo.transition_latency = 20 * 1000; + if (!print_once) { + print_once = 1; + printk(KERN_INFO "Capping off P-state tranision latency" + " at 20 uS\n"); + } + } + data->max_freq = perf->states[0].core_frequency * 1000; /* table init */ for (i=0; i<perf->state_count; i++) { |