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| author | Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> | 2016-07-20 02:52:01 +0300 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2016-07-21 15:29:30 +0300 |
| commit | da7de91c3e237f3ace1aa29b82c69702dc0176c5 (patch) | |
| tree | f98877f23dd6ac4897d30dfce2ad328c0b48126e /drivers | |
| parent | bc95a454b6dcf6aa464deef86e18c1770b8682b8 (diff) | |
| download | linux-da7de91c3e237f3ace1aa29b82c69702dc0176c5.tar.xz | |
cpufreq: intel_pstate: Check cpuid for MSR_HWP_INTERRUPT
The MSR MSR_HWP_INTERRUPT is valid only when CPUID.06H:EAX[8] = 1, so
check for feature before accessing this MSR.
Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/cpufreq/intel_pstate.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c index 9c8a78f9ddce..d8028def199d 100644 --- a/drivers/cpufreq/intel_pstate.c +++ b/drivers/cpufreq/intel_pstate.c @@ -806,7 +806,8 @@ static void __init intel_pstate_sysfs_expose_params(void) static void intel_pstate_hwp_enable(struct cpudata *cpudata) { /* First disable HWP notification interrupt as we don't process them */ - wrmsrl_on_cpu(cpudata->cpu, MSR_HWP_INTERRUPT, 0x00); + if (static_cpu_has(X86_FEATURE_HWP_NOTIFY)) + wrmsrl_on_cpu(cpudata->cpu, MSR_HWP_INTERRUPT, 0x00); wrmsrl_on_cpu(cpudata->cpu, MSR_PM_ENABLE, 0x1); } |