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x86: tsc: Add support for new S3_NONSTOP feature

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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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4
arch/x86/kernel/tsc.c
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@@ -768,6 +768,7 @@ static cycle_t read_tsc(struct clocksource *cs)
static void resume_tsc(struct clocksource *cs) static void resume_tsc(struct clocksource *cs)
{ {
if (!boot_cpu_has(X86_FEATURE_NONSTOP_TSC_S3))
clocksource_tsc.cycle_last = 0; clocksource_tsc.cycle_last = 0;
} }
@@ -939,6 +940,9 @@ static int __init init_tsc_clocksource(void)
clocksource_tsc.flags &= ~CLOCK_SOURCE_IS_CONTINUOUS; 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 * Trust the results of the earlier calibration on systems
* exporting a reliable TSC. * exporting a reliable TSC.