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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>
This commit is contained in:
Feng Tang 2013-03-12 11:56:47 +08:00 committed by John Stultz
parent 5caf463625
commit 82f9c080b2
1 changed files with 5 additions and 1 deletions
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6
arch/x86/kernel/tsc.c
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@ -768,7 +768,8 @@ static cycle_t read_tsc(struct clocksource *cs)
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 @@ static int __init init_tsc_clocksource(void)
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.