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MdeModulePkg/EhciDxe: Fix legacy handoff logic

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references acidanthera/bugtracker#2436
This commit is contained in:
vit9696 2024-10-27 04:30:33 +03:00 committed by Mikhail Krichanov
parent ba561ef7ff
commit 19ca216533
1 changed files with 11 additions and 0 deletions
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11
MdeModulePkg/Bus/Pci/EhciDxe/EhciReg.c
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@ -309,6 +309,17 @@ EhcClearLegacySupport (
PciIo->Pci.Read (PciIo, EfiPciIoWidthUint32, ExtendCap, 1, &Value);
PciIo->Pci.Read (PciIo, EfiPciIoWidthUint32, ExtendCap + 0x4, 1, &Value);
//
// Disable the SMI in USBLEGCTLSTS firstly
// Not doing this may result in a hardlock soon after
//
PciIo->Pci.Read (PciIo, EfiPciIoWidthUint32, ExtendCap + 0x4, 1, &Value);
Value &= 0xFFFF0000;
PciIo->Pci.Write (PciIo, EfiPciIoWidthUint32, ExtendCap + 0x4, 1, &Value);
//
// Get EHCI Ownership from legacy bios
//
PciIo->Pci.Read (PciIo, EfiPciIoWidthUint32, ExtendCap, 1, &Value);
Value |= (0x1 << 24);
PciIo->Pci.Write (PciIo, EfiPciIoWidthUint32, ExtendCap, 1, &Value);