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path: root/drivers/acpi/acpica/hwtimer.c
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Diffstat (limited to 'drivers/acpi/acpica/hwtimer.c')
-rw-r--r--drivers/acpi/acpica/hwtimer.c9
1 files changed, 5 insertions, 4 deletions
diff --git a/drivers/acpi/acpica/hwtimer.c b/drivers/acpi/acpica/hwtimer.c
index bfdce22f3798..0c1a8bbd05d6 100644
--- a/drivers/acpi/acpica/hwtimer.c
+++ b/drivers/acpi/acpica/hwtimer.c
@@ -5,7 +5,7 @@
*****************************************************************************/
/*
- * Copyright (C) 2000 - 2012, Intel Corp.
+ * Copyright (C) 2000 - 2013, Intel Corp.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
@@ -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, &quotient, NULL);
+ status = acpi_ut_short_divide(((u64)delta_ticks) * ACPI_USEC_PER_SEC,
+ ACPI_PM_TIMER_FREQUENCY, &quotient, NULL);
*time_elapsed = (u32) quotient;
return_ACPI_STATUS(status);