Merge branch 'upstream' of master.kernel.org:/pub/scm/linux/kernel/git/linville/wirel...

[powerpc.git] / arch / x86_64 / kernel / time.c

diff --git a/arch/x86_64/kernel/time.c b/arch/x86_64/kernel/time.c
index 9f05bc9..335cc91 100644 (file)
--- a/arch/x86_64/kernel/time.c
+++ b/arch/x86_64/kernel/time.c
@@ -498,7 +498,7 @@ static unsigned long get_cmos_time(void)
 {
        unsigned int year, mon, day, hour, min, sec;
        unsigned long flags;
-       unsigned extyear = 0;
+       unsigned century = 0;
 
        spin_lock_irqsave(&rtc_lock, flags);
 
@@ -510,9 +510,9 @@ static unsigned long get_cmos_time(void)
                mon = CMOS_READ(RTC_MONTH);
                year = CMOS_READ(RTC_YEAR);
 #ifdef CONFIG_ACPI
-               if (acpi_fadt.revision >= FADT2_REVISION_ID &&
-                                       acpi_fadt.century)
-                       extyear = CMOS_READ(acpi_fadt.century);
+               if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID &&
+                                       acpi_gbl_FADT.century)
+                       century = CMOS_READ(acpi_gbl_FADT.century);
 #endif
        } while (sec != CMOS_READ(RTC_SECONDS));
 
@@ -530,10 +530,10 @@ static unsigned long get_cmos_time(void)
        BCD_TO_BIN(mon);
        BCD_TO_BIN(year);
 
-       if (extyear) {
-               BCD_TO_BIN(extyear);
-               year += extyear;
-               printk(KERN_INFO "Extended CMOS year: %d\n", extyear);
+       if (century) {
+               BCD_TO_BIN(century);
+               year += century * 100;
+               printk(KERN_INFO "Extended CMOS year: %d\n", century * 100);
        } else { 
                /*
                 * x86-64 systems only exists since 2002.
@@ -656,6 +656,25 @@ core_initcall(cpufreq_tsc);
  */
 
 #define TICK_COUNT 100000000
+#define TICK_MIN   5000
+
+/*
+ * Some platforms take periodic SMI interrupts with 5ms duration. Make sure none
+ * occurs between the reads of the hpet & TSC.
+ */
+static void __init read_hpet_tsc(int *hpet, int *tsc)
+{
+       int tsc1, tsc2, hpet1;
+
+       do {
+               tsc1 = get_cycles_sync();
+               hpet1 = hpet_readl(HPET_COUNTER);
+               tsc2 = get_cycles_sync();
+       } while (tsc2 - tsc1 > TICK_MIN);
+       *hpet = hpet1;
+       *tsc = tsc2;
+}
+
 
 static unsigned int __init hpet_calibrate_tsc(void)
 {
@@ -666,13 +685,11 @@ static unsigned int __init hpet_calibrate_tsc(void)
        local_irq_save(flags);
        local_irq_disable();
 
-       hpet_start = hpet_readl(HPET_COUNTER);
-       rdtscl(tsc_start);
+       read_hpet_tsc(&hpet_start, &tsc_start);
 
        do {
                local_irq_disable();
-               hpet_now = hpet_readl(HPET_COUNTER);
-               tsc_now = get_cycles_sync();
+               read_hpet_tsc(&hpet_now, &tsc_now);
                local_irq_restore(flags);
        } while ((tsc_now - tsc_start) < TICK_COUNT &&
                 (hpet_now - hpet_start) < TICK_COUNT);
@@ -937,7 +954,7 @@ __cpuinit int unsynchronized_tsc(void)
        if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) {
 #ifdef CONFIG_ACPI
                /* But TSC doesn't tick in C3 so don't use it there */
-               if (acpi_fadt.length > 0 && acpi_fadt.plvl3_lat < 1000)
+               if (acpi_gbl_FADT.header.length > 0 && acpi_gbl_FADT.C3latency < 1000)
                        return 1;
 #endif
                return 0;