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[VBEMP] Disable reporting multiple monitors

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It has never worked, and only leads to some infinite loops with some hardware or BIOS configurations.
This commit is contained in:
Hervé Poussineau 2021-12-23 19:08:13 +01:00
parent f03750de6a
commit 983d9a1c2a
1 changed files with 31 additions and 73 deletions
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104
win32ss/drivers/miniport/vbe/edid.c
View file

@ -235,80 +235,38 @@ VBEGetVideoChildDescriptor(
OUT PULONG UId,
OUT PULONG pUnused)
{
PVBE_DEVICE_EXTENSION VBEDeviceExtension =
(PVBE_DEVICE_EXTENSION)HwDeviceExtension;
ULONG ChildIndex;
if (ChildEnumInfo->Size != sizeof(VIDEO_CHILD_ENUM_INFO) ||
ChildEnumInfo->ChildDescriptorSize < MAX_SIZE_OF_EDID)
{
return ERROR_INVALID_FUNCTION;
}
/*
* We are called very early in device initialization, even before
* VBEInitialize is called. So, our Int10 interface is not set.
* Ignore this call, we will trigger another one later.
*/
if (VBEDeviceExtension->Int10Interface.Size == 0)
return VIDEO_ENUM_NO_MORE_DEVICES;
if (ChildEnumInfo->ChildIndex == 0)
{
/* We don't support enumeration of ACPI children */
return ERROR_NO_MORE_DEVICES;
}
else if (ChildEnumInfo->ChildIndex == 1)
{
/* Our screen */
*VideoChildType = Monitor;
*UId = 1;
if (ChildEnumInfo->Size != sizeof(VIDEO_CHILD_ENUM_INFO))
{
VideoPortDebugPrint(Error, "VBEMP: Wrong VIDEO_CHILD_ENUM_INFO structure size\n");
return VIDEO_ENUM_NO_MORE_DEVICES;
}
else if (ChildEnumInfo->ChildDescriptorSize < MAX_SIZE_OF_EDID)
{
VideoPortDebugPrint(Warn, "VBEMP: Too small buffer for EDID\n");
return VIDEO_ENUM_NO_MORE_DEVICES;
}
else if (ChildEnumInfo->ChildIndex == DISPLAY_ADAPTER_HW_ID)
{
*VideoChildType = VideoChip;
*UId = 0;
return VIDEO_ENUM_MORE_DEVICES; /* FIXME: not sure... */
}
/* Try to read EDID information using 2 different methods. */
if (VBEReadEdid(HwDeviceExtension, 0, pChildDescriptor))
{
VideoPortDebugPrint(Info, "VBEMP: EDID information read directly\n");
}
else if (VBEReadEdidUsingSCI(HwDeviceExtension, 0, pChildDescriptor))
{
VideoPortDebugPrint(Info, "VBEMP: EDID information read using I2C\n");
}
/*
* Get Child ID
*/
if (ChildEnumInfo->ChildIndex != 0)
ChildIndex = ChildEnumInfo->ChildIndex;
else
ChildIndex = ChildEnumInfo->ACPIHwId;
VideoPortDebugPrint(Info, "VBEMP: ChildEnumInfo->ChildIndex %lu, ChildEnumInfo->ACPIHwId %lu => %lu\n",
ChildEnumInfo->ChildIndex, ChildEnumInfo->ACPIHwId, ChildIndex);
/*
* Try to read EDID information using 2 different methods.
*/
if (VBEReadEdid(HwDeviceExtension, ChildIndex, pChildDescriptor))
{
VideoPortDebugPrint(Info, "VBEMP: EDID information read directly\n");
}
else if (VBEReadEdidUsingSCI(HwDeviceExtension, ChildIndex, pChildDescriptor))
{
VideoPortDebugPrint(Info, "VBEMP: EDID information read using I²C\n");
}
else if (ChildEnumInfo->ChildIndex == 1)
{
/* We must have 1 monitor, so just report it with no EDID information */
VideoPortDebugPrint(Info, "VBEMP: Reporting monitor with no EDID information\n");
}
else
{
VideoPortDebugPrint(Warn, "VBEMP: Unable to read EDID information\n");
return VIDEO_ENUM_NO_MORE_DEVICES;
}
/*
* Fill return data
*/
*VideoChildType = Monitor;
if (ChildIndex == 0)
{
/*
* This is the actual display adapter
*/
*UId = DISPLAY_ADAPTER_HW_ID;
}
else
*UId = ChildIndex;
*pUnused = 0;
return VIDEO_ENUM_MORE_DEVICES;
return VIDEO_ENUM_MORE_DEVICES;
}
else
{
/* Unknown hardware id */
return ERROR_NO_MORE_DEVICES;
}
}