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| author | Bob Moore <robert.moore@intel.com> | 2012-12-31 04:05:46 +0400 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2013-01-10 15:36:20 +0400 |
| commit | c41679a4481d5bf9908d99644d47b2e8ff6f028f (patch) | |
| tree | 89a95a2f59b1406722644bf47976a071f9835e71 /drivers/acpi/acpica/hwtimer.c | |
| parent | c8d586f8ed0146d81186131df66cdbb19c41acda (diff) | |
| download | linux-c41679a4481d5bf9908d99644d47b2e8ff6f028f.tar.xz | |
ACPICA: Add time macros for various timer/time manipulation.
Constants for time manipulation, including constants for the 100
nanosecond timers. Chao Guan, Bob Moore, Lv Zheng.
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/acpi/acpica/hwtimer.c')
| -rw-r--r-- | drivers/acpi/acpica/hwtimer.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/drivers/acpi/acpica/hwtimer.c b/drivers/acpi/acpica/hwtimer.c index bfdce22f3798..4e741d85e6b4 100644 --- a/drivers/acpi/acpica/hwtimer.c +++ b/drivers/acpi/acpica/hwtimer.c @@ -176,10 +176,11 @@ acpi_get_timer_duration(u32 start_ticks, u32 end_ticks, u32 * time_elapsed) /* * Compute Duration (Requires a 64-bit multiply and divide): * - * time_elapsed = (delta_ticks * 1000000) / PM_TIMER_FREQUENCY; + * time_elapsed (microseconds) = + * (delta_ticks * ACPI_USEC_PER_SEC) / ACPI_PM_TIMER_FREQUENCY; */ - status = acpi_ut_short_divide(((u64) delta_ticks) * 1000000, - PM_TIMER_FREQUENCY, "ient, NULL); + status = acpi_ut_short_divide(((u64)delta_ticks) * ACPI_USEC_PER_SEC, + ACPI_PM_TIMER_FREQUENCY, "ient, NULL); *time_elapsed = (u32) quotient; return_ACPI_STATUS(status); |