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MdeModulePkg/XhciDxe: Usb legacy support feature is optional. For those usb 3.0 devices which doesn’t support this feature, should directly return and not touch corresponding registers

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Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Sergey Isakov <isakov-sl@bk.ru>
Signed-off-by: Tian, Feng <feng.tian@intel.com>
Reviewed-by:   Li, Elvin <elvin.li@intel.com>


git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@14776 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
Sergey Isakov
2013-10-15 06:13:14 +00:00
committed by erictian
parent 6f05c02325
commit 74b04490da
2 changed files with 11 additions and 3 deletions
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2
MdeModulePkg/Bus/Pci/XhciDxe/Xhci.c
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@@ -164,7 +164,7 @@ XhcReset (
// Flow through, same behavior as Host Controller Reset
//
case EFI_USB_HC_RESET_HOST_CONTROLLER:
if (((XhcReadExtCapReg (Xhc, Xhc->DebugCapSupOffset) & 0xFF) == XHC_CAP_USB_DEBUG) &&
if ((Xhc->DebugCapSupOffset != 0xFFFFFFFF) && ((XhcReadExtCapReg (Xhc, Xhc->DebugCapSupOffset) & 0xFF) == XHC_CAP_USB_DEBUG) &&
((XhcReadExtCapReg (Xhc, Xhc->DebugCapSupOffset + XHC_DC_DCCTRL) & BIT0) != 0)) {
Status = EFI_SUCCESS;
goto ON_EXIT;