Messages in this thread Patch in this message | | | From | Feng Tang <> | Subject | [RFC PATCH 3/5] x86: tsc: Add support for new S3_NOTSTOP feature | Date | Mon, 21 Jan 2013 14:38:43 +0800 |
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Signed-off-by: Feng Tang <feng.tang@intel.com> --- arch/x86/kernel/tsc.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/arch/x86/kernel/tsc.c b/arch/x86/kernel/tsc.c index 06ccb50..4cc33ca 100644 --- a/arch/x86/kernel/tsc.c +++ b/arch/x86/kernel/tsc.c @@ -767,7 +767,8 @@ 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_TSC_S3_NOTSTOP)) + clocksource_tsc.cycle_last = 0; } static struct clocksource clocksource_tsc = { @@ -938,6 +939,9 @@ static int __init init_tsc_clocksource(void) clocksource_tsc.flags &= ~CLOCK_SOURCE_IS_CONTINUOUS; } + if (boot_cpu_has(X86_FEATURE_TSC_S3_NOTSTOP)) + clocksource_tsc.flags |= CLOCK_SOURCE_SUSPEND_NOTSTOP; + /* * Trust the results of the earlier calibration on systems * exporting a reliable TSC. -- 1.7.9.5
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