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intel_pstate: set BYT MSR with wrmsrl_on_cpu()

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Commit 007bea098b (intel_pstate: Add setting voltage value for
baytrail P states.) introduced byt_set_pstate() with the assumption that
it would always be run by the CPU whose MSR is to be written by it.  It
turns out, however, that is not always the case in practice, so modify
byt_set_pstate() to enforce the MSR write done by it to always happen on
the right CPU.

Fixes: 007bea098b (intel_pstate: Add setting voltage value for baytrail P states.)
Signed-off-by: Joe Konno <joe.konno@intel.com>
Acked-by: Kristen Carlson Accardi <kristen@linux.intel.com>
Cc: 3.14+ <stable@vger.kernel.org> # 3.14+
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Joe Konno 2015-05-12 07:59:42 -07:00 committed by Rafael J. Wysocki
parent 303ae72307
commit 0dd23f9425
1 changed files with 1 additions and 1 deletions
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2
drivers/cpufreq/intel_pstate.c
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@ -537,7 +537,7 @@ static void byt_set_pstate(struct cpudata *cpudata, int pstate)
val |= vid;
wrmsrl(MSR_IA32_PERF_CTL, val);
wrmsrl_on_cpu(cpudata->cpu, MSR_IA32_PERF_CTL, val);
}
#define BYT_BCLK_FREQS 5