MdeModulePkg/UsbBusDxe: Timing tunning for better boot performance.

[mirror_edk2.git] / MdeModulePkg / Bus / Usb / UsbBusDxe / UsbHub.c

diff --git a/MdeModulePkg/Bus/Usb/UsbBusDxe/UsbHub.c b/MdeModulePkg/Bus/Usb/UsbBusDxe/UsbHub.c
index 78af917ca0400826b53352e4841a2165a76b1397..2d24bb4b8a23484a2f6fea429a28d727af4c5df6 100644 (file)
--- a/MdeModulePkg/Bus/Usb/UsbBusDxe/UsbHub.c
+++ b/MdeModulePkg/Bus/Usb/UsbBusDxe/UsbHub.c
@@ -763,7 +763,12 @@ UsbHubInit (
       UsbHubCtrlSetPortFeature (HubIf->Device, Index, (EFI_USB_PORT_FEATURE) USB_HUB_PORT_POWER);\r
     }\r
 \r
-    gBS->Stall (HubDesc.PwrOn2PwrGood * USB_SET_PORT_POWER_STALL);\r
+    //\r
+    // Update for the usb hub has no power on delay requirement\r
+    //\r
+    if (HubDesc.PwrOn2PwrGood > 0) {\r
+      gBS->Stall (HubDesc.PwrOn2PwrGood * USB_SET_PORT_POWER_STALL);\r
+    }\r
     UsbHubAckHubStatus (HubIf->Device);\r
   }\r
 \r