struct

The transcoder's mode of operation.

This field must not be changed while `enabled` is true.

This field must be changed in the same MMIO write as the

`display_port_transport_tiger_lake` field.

In HDMI mode, the transcoder sends a null packet (32 zero bytes) when

Vsync is asserted. The transcoder also sends a preamble and guardband

before each null packet. These behaviors match the HDMI specification.

In DVI mode, enabling DIP (Data Island Packets) or audio causes the

transcoder to adopt the HDMI behavior described above.

DisplayPort modes SST (Single Stream) or MST (Multi-Stream) must match the

mode selected in the `DpTransportControl` register.

On Tiger Lake, the DSI transcoders ignore this field.

On Kaby Lake, transcoder EDP (and therefore DDI A) must be in the

DisplayPort SST (Single Stream) mode.