Enabling usb3.0 XHCI support.

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

diff --git a/MdeModulePkg/Bus/Usb/UsbBusDxe/UsbDesc.c b/MdeModulePkg/Bus/Usb/UsbBusDxe/UsbDesc.c
index 55fe5c873c7ea9cca1473fab0abc5ad8a499b739..529b136188ace95104d6dfb9e069e0c9b202c165 100644 (file)
--- a/MdeModulePkg/Bus/Usb/UsbBusDxe/UsbDesc.c
+++ b/MdeModulePkg/Bus/Usb/UsbBusDxe/UsbDesc.c
@@ -527,12 +527,14 @@ UsbGetMaxPacketSize0 (
   // Get the first 8 bytes of the device descriptor which contains\r
   // max packet size for endpoint 0, which is at least 8.\r
   //\r
-  UsbDev->MaxPacket0 = 8;\r
-\r
   for (Index = 0; Index < 3; Index++) {\r
     Status = UsbCtrlGetDesc (UsbDev, USB_DESC_TYPE_DEVICE, 0, 0, &DevDesc, 8);\r
 \r
     if (!EFI_ERROR (Status)) {\r
+      if ((DevDesc.BcdUSB == 0x0300) && (DevDesc.MaxPacketSize0 == 9)) {\r
+        UsbDev->MaxPacket0 = 1 << 9;\r
+        return EFI_SUCCESS;\r
+      }\r
       UsbDev->MaxPacket0 = DevDesc.MaxPacketSize0;\r
       return EFI_SUCCESS;\r
     }\r