x86: tsc: Add support for new S3_NONSTOP feature
Add support for new S3_NONSTOP feature
Signed-off-by: Feng Tang <feng.tang@intel.com>
Signed-off-by: John Stultz <john.stultz@linaro.org>
diff --git a/arch/x86/kernel/tsc.c b/arch/x86/kernel/tsc.c
index 4b9ea10..098b3cf 100644
--- a/arch/x86/kernel/tsc.c
+++ b/arch/x86/kernel/tsc.c
@@ -768,7 +768,8 @@
static void resume_tsc(struct clocksource *cs)
{
- clocksource_tsc.cycle_last = 0;
+ if (!boot_cpu_has(X86_FEATURE_NONSTOP_TSC_S3))
+ clocksource_tsc.cycle_last = 0;
}
static struct clocksource clocksource_tsc = {
@@ -939,6 +940,9 @@
clocksource_tsc.flags &= ~CLOCK_SOURCE_IS_CONTINUOUS;
}
+ if (boot_cpu_has(X86_FEATURE_NONSTOP_TSC_S3))
+ clocksource_tsc.flags |= CLOCK_SOURCE_SUSPEND_NONSTOP;
+
/*
* Trust the results of the earlier calibration on systems
* exporting a reliable TSC.