diff options
Diffstat (limited to 'MdeModulePkg/Bus')
| -rw-r--r-- | MdeModulePkg/Bus/Pci/XhciPei/XhcPeim.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/MdeModulePkg/Bus/Pci/XhciPei/XhcPeim.c b/MdeModulePkg/Bus/Pci/XhciPei/XhcPeim.c index a58739fb4a..57e70701e8 100644 --- a/MdeModulePkg/Bus/Pci/XhciPei/XhcPeim.c +++ b/MdeModulePkg/Bus/Pci/XhciPei/XhcPeim.c @@ -407,6 +407,12 @@ XhcPeiResetHC ( }
XhcPeiSetOpRegBit (Xhc, XHC_USBCMD_OFFSET, XHC_USBCMD_RESET);
+ //
+ // Some XHCI host controllers require to have extra 1ms delay before accessing any MMIO register during reset.
+ // Otherwise there may have the timeout case happened.
+ // The below is a workaround to solve such problem.
+ //
+ MicroSecondDelay (1000);
Status = XhcPeiWaitOpRegBit (Xhc, XHC_USBCMD_OFFSET, XHC_USBCMD_RESET, FALSE, Timeout);
ON_EXIT:
DEBUG ((EFI_D_INFO, "XhcPeiResetHC: %r\n", Status));
|