System and method for providing PCIE over displayport
An apparatus and method is disclosed for providing an extensible information handling system (IHS) bus implemented on predetermined channels of a digital video interface. IHS video signal information is multiplexed with IHS bus information by a host multiplexer for transmission across a digital video connector. The multiplexed IHS video signal and IHS bus information is received by a display multiplexer, where it is demultiplexed. Demultiplexed IHS video signal information is received by a video interface receiver, where it is used to generate an image on a digital display. Demultiplexed IHS bus information is received by a host bus interface transmitter/receiver, where it is used to support peripheral devices attached to the digital display.
1. An information handling system comprising:
a processor configured to generate information;
a video display subsystem interfaced with the processor and configured to process the information into video information for communication to a display;
a host main link coupled to the video display subsystem and configured to couple to a display cable;
a display configured to present the video information as visual images;
a display main link coupled to the display and configured to couple to the display cable;
a display cable directly connected at a first end to the host main link and at a second end to the display main link, the display cable having one contiguous length between the first and second ends, the display cable configured to communicate the video information from the video display subsystem to the display across four serial links disposed in the cable; and
a peripheral connected directly to the display and having associated peripheral information;
wherein the display main link is further configured to communicate the peripheral information through the display cable to the host main link, the display main link and host main link cooperating to selectively assign some of the four serial links to communicate the peripheral information while the remaining of the four serial links communicate the video information.
2. The information handling system of claim 1 further comprising:
a display receiver interfaced with the display main link and configured to receive the video information from the display cable;
a peripheral transceiver interfaced with the display main link and configured to communicate peripheral information with the display cable; and
a multiplexor disposed between the main link and the display receiver and the peripheral transceiver, the multiplexor configured to manage the interface of the video information and peripheral information through the display cable.
3. The information handling system of claim 2 wherein the multiplexor manages the interface of video information and peripheral through the connector by interfacing the display receiver with predetermined of the links and the peripheral transceiver with predetermined of the links.
4. The information handling system of claim 1 further comprising:
an identifier stored on the display; and
logic associated with the video display subsystem, the logic operable to retrieve the identifier and apply the identifier to determine if the display connector includes peripheral information.
5. The information handling system of claim 1 wherein the video information comprises DisplayPort information and the peripheral information comprises PCIe information.
6. A method for communicating information comprising:
connecting a display cable directly to an information handling system at a first end of the display cable and directly to a display at a second end of the display cable, the first and second ends coupled at opposing ends of a single contiguous cable length;
communicating video information from the information handling system to the display through plural serial links disposed in the display cable; and
selectively communicating peripheral information from the display to the information handling system through some but not all of the plural serial links while the remaining of the plural serial links communicate video information from the information handling system to the display.
7. The method of claim 6 wherein the video information comprises DisplayPort information and the peripheral information comprises PCIe information.
8. The method of claim 6 wherein the display cable comprises four serial links and selectively communicating peripheral information further comprises communicating only video information through two of the four serial links and communicating only the peripheral information through the other two of the four serial links.
9. The method of claim 6 further comprising:
retrieving identifier information from the display to the information handling system;
analyzing the identifier information at the information handling system to confirm the availability of peripheral information communication at the display before the selectively communicating the peripheral information.
10. The method of claim 9 wherein the display cable comprises a bi-directional auxiliary link and retrieving identifier information comprises retrieving the identifier information through the auxiliary link.
11. A method for communicating information between an information handling system and a display, the method comprising:
generating video information at the information handling system;
generating peripheral information at the display;
connecting a display cable directly to the information handling system at a first end and directly to the display at a second end, the display cable having a single contiguous length between the first and second ends, the cable including plural serial links configured to communicate the video information from the information handling system to the display;
communicating identifier information from the display to the information handling system, the identifier information indicating that the display can multiplex peripheral information with the video information through the display cable; and
in response to the identifier information, multiplexing the peripheral information through at least some of the display cable serial links to communicate the peripheral information from the display to the information handling system.
12. The method of claim 11 wherein multiplexing comprises communicating video information over less than all serial links of the display cable and sending peripheral information over the remaining serial links of the display cable.
13. The method of claim 12 wherein the display cable has four serial links, communicating video information over less than all serial links comprises communicating video information over two of the four serial links, and sending peripheral information over the remaining serial links comprises sending peripheral information over the other two of the four serial links.
14. The method of claim 13 wherein the display cable comprises a DisplayPort cable.
15. The method of claim 14 wherein the peripheral information comprises PCIe information.
16. The method of claim 11 wherein communicating identifier information further comprises communicating identifier information across a bi-directional auxiliary link of the display cable.