diff options
| author | Ingo Molnar <mingo@elte.hu> | 2008-12-02 20:09:50 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-12-02 20:09:50 +0100 |
| commit | a64d31baed104be25305e9c71585d3ea4ee9a418 (patch) | |
| tree | 470e3c59ef39f38bcd69f8fef7dba8f76afbec53 /arch/x86/kernel/cpu/cpufreq/powernow-k8.c | |
| parent | 1c39194878c09bd88ffc9c9d4c2f01c3397c7aed (diff) | |
| parent | 061e41fdb5047b1fb161e89664057835935ca1d2 (diff) | |
Merge branch 'linus' into cpus4096
Conflicts:
kernel/trace/ring_buffer.c
Diffstat (limited to 'arch/x86/kernel/cpu/cpufreq/powernow-k8.c')
| -rw-r--r-- | arch/x86/kernel/cpu/cpufreq/powernow-k8.c | 18 |
1 files changed, 15 insertions, 3 deletions
diff --git a/arch/x86/kernel/cpu/cpufreq/powernow-k8.c b/arch/x86/kernel/cpu/cpufreq/powernow-k8.c index d3dcd58b87c..7f05f44b97e 100644 --- a/arch/x86/kernel/cpu/cpufreq/powernow-k8.c +++ b/arch/x86/kernel/cpu/cpufreq/powernow-k8.c @@ -115,9 +115,20 @@ static int query_current_values_with_pending_wait(struct powernow_k8_data *data) u32 i = 0; if (cpu_family == CPU_HW_PSTATE) { - rdmsr(MSR_PSTATE_STATUS, lo, hi); - i = lo & HW_PSTATE_MASK; - data->currpstate = i; + if (data->currpstate == HW_PSTATE_INVALID) { + /* read (initial) hw pstate if not yet set */ + rdmsr(MSR_PSTATE_STATUS, lo, hi); + i = lo & HW_PSTATE_MASK; + + /* + * a workaround for family 11h erratum 311 might cause + * an "out-of-range Pstate if the core is in Pstate-0 + */ + if (i >= data->numps) + data->currpstate = HW_PSTATE_0; + else + data->currpstate = i; + } return 0; } do { @@ -1121,6 +1132,7 @@ static int __cpuinit powernowk8_cpu_init(struct cpufreq_policy *pol) } data->cpu = pol->cpu; + data->currpstate = HW_PSTATE_INVALID; if (powernow_k8_cpu_init_acpi(data)) { /* |