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-rw-r--r--arch/x86/kernel/tsc.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/x86/kernel/tsc.c b/arch/x86/kernel/tsc.c
index 930e5d4..e574716 100644
--- a/arch/x86/kernel/tsc.c
+++ b/arch/x86/kernel/tsc.c
@@ -419,6 +419,16 @@ unsigned long native_calibrate_tsc(void)
unsigned long flags, latch, ms, fast_calibrate;
int hpet = is_hpet_enabled(), i, loopmin;
+ /* Calibrate TSC using MSR for Intel Atom SoCs */
+ local_irq_save(flags);
+ i = try_msr_calibrate_tsc(&fast_calibrate);
+ local_irq_restore(flags);
+ if (i >= 0) {
+ if (i == 0)
+ pr_warn("Fast TSC calibration using MSR failed\n");
+ return fast_calibrate;
+ }
+
local_irq_save(flags);
fast_calibrate = quick_pit_calibrate();
local_irq_restore(flags);
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