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| author |   Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> | 2008-04-28 15:13:43 -0400 |
|---|---|---|
| committer |   Dave Jones <davej@redhat.com> | 2008-04-28 15:16:46 -0400 |
| commit | e56a727b023d40d1adf660168883f30f2e6abe0a (patch) | |
| tree | b79841b8f4c79204b160bae2a6a61d8a62019c48 | |
| parent | [CPUFREQ] change cpu freq tables to per_cpu variables (diff) | |
| download | linux-dev-e56a727b023d40d1adf660168883f30f2e6abe0a.tar.xz linux-dev-e56a727b023d40d1adf660168883f30f2e6abe0a.zip | |
[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>
| -rw-r--r-- | arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.c b/arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.c index e2d870de837c..8db8f73503b3 100644 --- a/arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.c +++ b/arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.c @@ -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; |