diff options
| -rw-r--r-- | MdeModulePkg/Bus/Pci/XhciDxe/Xhci.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/MdeModulePkg/Bus/Pci/XhciDxe/Xhci.c b/MdeModulePkg/Bus/Pci/XhciDxe/Xhci.c index a9d7e3616e..c830db66a1 100644 --- a/MdeModulePkg/Bus/Pci/XhciDxe/Xhci.c +++ b/MdeModulePkg/Bus/Pci/XhciDxe/Xhci.c @@ -2397,7 +2397,7 @@ XhcGetElapsedTicks ( // Counter counts upwards, check for an overflow condition
//
if (*PreviousTick > CurrentTick) {
- Delta = (mXhciPerformanceCounterEndValue - *PreviousTick) + CurrentTick;
+ Delta = (CurrentTick - mXhciPerformanceCounterStartValue) + (mXhciPerformanceCounterEndValue - *PreviousTick);
} else {
Delta = CurrentTick - *PreviousTick;
}
@@ -2406,7 +2406,7 @@ XhcGetElapsedTicks ( // Counter counts downwards, check for an underflow condition
//
if (*PreviousTick < CurrentTick) {
- Delta = (mXhciPerformanceCounterStartValue - CurrentTick) + *PreviousTick;
+ Delta = (mXhciPerformanceCounterStartValue - CurrentTick) + (*PreviousTick - mXhciPerformanceCounterEndValue);
} else {
Delta = *PreviousTick - CurrentTick;
}
|