DXGKARG_DPAUXIOTRANSMISSION structure (dispmprt.h)
The DXGKARG_DPAUXIOTRANSMISSION structure is a parameter for the DXGKDDI_DPAUXIOTRANSMISSION callback.
Syntax
typedef struct _DXGKARG_DPAUXIOTRANSMISSION {
struct {
UINT Write : 1;
UINT CanUseCachedData : 1;
UINT Reserved : 30;
};
UINT RootPortIndex;
UINT DPCDAddress;
BYTE NumBytesRequested;
UINT DPNativeError;
BYTE NumBytesDone;
BYTE Data[MAX_DP_NATIVE_AUX_IO_SIZE];
} DXGKARG_DPAUXIOTRANSMISSION, *PDXGKARG_DPAUXIOTRANSMISSION;
Members
Write
Indicates whether the operation is read or write. A value of zero indicates that the DisplayPort Configuration Data (DPCD) operation is a read; a value of one indicates a write to the DPCD.
CanUseCachedData
When set, indicates that the driver can use cached data without actual AUX transaction.
Reserved
Reserved; do not use.
RootPortIndex
Index value of the DP-capable connector on which to perform the DPCD read or write operation. The driver returned the total number of DP-capable connectors on the GPU in a prior call to DXGKDDI_QUERYDPCAPS. Subsequent calls to DXGKDDI_DPAUXIOTRANSMISSION refer to the DP connectors with RootPortIndex ranging from 0 to NumRootPorts - 1.
DPCDAddress
The DPCD address for the read or write operation.
NumBytesRequested
Number of bytes to read/write starting at DPCDAddress.
DPNativeError
Field in which the driver can encode more details about the error when returning STATUS_DEVICE_PROTOCOL_ERROR from DXGKDDI_DPAUXIOTRANSMISSION.
NumBytesDone
Actual number of bytes that were read or written.
Data[MAX_DP_NATIVE_AUX_IO_SIZE]
Buffer containing the data to write for a write operation, or in which to receive the data for a read operation.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Windows 10, version 2004 |
| Header | dispmprt.h |