diff options
| author | Dave Jones <davej@redhat.com> | 2005-05-31 19:03:46 -0700 |
|---|---|---|
| committer | Dave Jones <davej@redhat.com> | 2005-05-31 19:03:46 -0700 |
| commit | c5d28fb297efaa97c4b90e36f9dff3066e7f2778 (patch) | |
| tree | b0636983104860fa15d9054d29ec9e8b912642cd /arch/i386/kernel/timers/timer_tsc.c | |
| parent | 91350ed49bf3613e243c2e216228cd4ae8f32516 (diff) | |
[CPUFREQ] Recalibrate cpu_khz [2/2]
Some cpufreq drivers (at that time, only powernow-k7) need to recalibrate the
cpu_khz at runtime.
Signed-off-by: Bruno Ducrot <ducrot@poupinou.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Dave Jones <davej@redhat.com>
Diffstat (limited to 'arch/i386/kernel/timers/timer_tsc.c')
| -rw-r--r-- | arch/i386/kernel/timers/timer_tsc.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/arch/i386/kernel/timers/timer_tsc.c b/arch/i386/kernel/timers/timer_tsc.c index 7926d967be00..180444d87824 100644 --- a/arch/i386/kernel/timers/timer_tsc.c +++ b/arch/i386/kernel/timers/timer_tsc.c @@ -320,6 +320,26 @@ core_initcall(cpufreq_tsc); static inline void cpufreq_delayed_get(void) { return; } #endif +int recalibrate_cpu_khz(void) +{ +#ifndef CONFIG_SMP + unsigned long cpu_khz_old = cpu_khz; + + if (cpu_has_tsc) { + init_cpu_khz(); + cpu_data[0].loops_per_jiffy = + cpufreq_scale(cpu_data[0].loops_per_jiffy, + cpu_khz_old, + cpu_khz); + return 0; + } else + return -ENODEV; +#else + return -ENODEV; +#endif +} +EXPORT_SYMBOL(recalibrate_cpu_khz); + static void mark_offset_tsc(void) { unsigned long lost,delay; |