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[CPUFREQ] Make acpi-cpufreq more robust against BIOS freq changes behind our back. 

We checked the hardware freq with OS cached freq value in get_cur_freqon_cpu().

Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Thomas Renninger <trenn@suse.de>
Signed-off-by: Dave Jones <davej@redhat.com>
This commit is contained in:
Venkatesh Pallipadi 2008-04-28 15:13:43 -04:00 committed by Dave Jones
parent c938ac2132
commit e56a727b02
1 changed files with 10 additions and 0 deletions
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10
arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.c
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@ -339,6 +339,7 @@ static unsigned int get_cur_freq_on_cpu(unsigned int cpu)
{
struct acpi_cpufreq_data *data = per_cpu(drv_data, cpu);
unsigned int freq;
unsigned int cached_freq;
dprintk("get_cur_freq_on_cpu (%d)\n", cpu);
@ -347,7 +348,16 @@ static unsigned int get_cur_freq_on_cpu(unsigned int cpu)
return 0;
}
cached_freq = data->freq_table[data->acpi_data->state].frequency;
freq = extract_freq(get_cur_val(&cpumask_of_cpu(cpu)), data);
if (freq != cached_freq) {
/*
* The dreaded BIOS frequency change behind our back.
* Force set the frequency on next target call.
*/
data->resume = 1;
}
dprintk("cur freq = %u\n", freq);
return freq;