diff options
Diffstat (limited to 'ArmPkg/Drivers/TimerDxe/TimerDxe.c')
-rw-r--r-- | ArmPkg/Drivers/TimerDxe/TimerDxe.c | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/ArmPkg/Drivers/TimerDxe/TimerDxe.c b/ArmPkg/Drivers/TimerDxe/TimerDxe.c index 633876bea6..ccdb38c79b 100644 --- a/ArmPkg/Drivers/TimerDxe/TimerDxe.c +++ b/ArmPkg/Drivers/TimerDxe/TimerDxe.c @@ -141,12 +141,13 @@ TimerDriverSetTimerPeriod ( ArmArchTimerDisableTimer ();
if (TimerPeriod != 0) {
- // Convert TimerPeriod to micro sec units
- TimerTicks = DivU64x32 (TimerPeriod, 10);
+ // TimerTicks = TimerPeriod in 1ms unit x Frequency.10^-3
+ // = TimerPeriod.10^-4 x Frequency.10^-3
+ // = (TimerPeriod x Frequency) x 10^-7
+ TimerTicks = MultU64x32 (TimerPeriod, FixedPcdGet32 (PcdArmArchTimerFreqInHz));
+ TimerTicks = DivU64x32 (TimerTicks, 10000000U);
- TimerTicks = MultU64x32 (TimerTicks, (PcdGet32(PcdArmArchTimerFreqInHz)/1000000));
-
- ArmArchTimerSetTimerVal((UINTN)TimerTicks);
+ ArmArchTimerSetTimerVal ((UINTN)TimerTicks);
// Enable the timer
ArmArchTimerEnableTimer ();
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