Method and system for providing a mesh network of displays using a universal serial bus
An information handling system includes displays, each of which has a first upstream-facing port (UFP), a second UFP, a downstream-facing port (DFP), and a multiplexer for selecting among the first UFP and the second UFP. The DFP of each display is connected to the first UFP of its respective succeeding display so as to form a ring network topology. A host computer is connected to the second UFP of a first display, and the multiplexer of the first display configured to select the second UFP.
1. A method comprising:
in a first display among a plurality of displays connected according to a ring network topology, sending, at a downstream-facing port (DFP) of the first display, a message downstream via the displays, wherein the message includes a unique random number;
checking for receipt of the message via a first upstream-facing port (UFP) of the first display; and
upon receipt of the message via the first UFP of the first display, configuring a multiplexer to switch from selection of the first UFP of the first display to selection of a second UFP of the first display, wherein the first display is configured to maintain continuity of a configuration channel (CC) of the ring network topology regardless of selection of the second UFP of the first display by the multiplexer.
2. The method of claim 1 , wherein the sending, at the DFP of the first display, the message downstream via the plurality of displays is performed in response a host computer being connected to the second UFP of the first display.
3. The method of claim 1 , wherein the first UFP, the second UFP, and the DFP of the first display are Universal Serial Bus Type C (USB-C) ports.
4. The method of claim 1 , wherein the first UFP, the second UFP, and the DFP of the first display are Display Port (DP) ports.
5. The method of claim 1 , further comprising:
in a second display of the plurality of displays, receiving the message sent downstream by the first display, wherein a second display multiplexer of the second display is configured to maintain selection of a second display first UFP of the second display, wherein the second display is configured to relay via a second display DFP of the second display the message sent by the first display and received by the second display.
6. The method of claim 1 , wherein the sending, at the downstream-facing port (DFP) of the first display, the message downstream via the plurality of displays, the checking for the receipt of the message via the first upstream-facing port (UFP) of the first display, and the configuring the multiplexer are controlled by a scaler of the first display.
7. An information handling system (IHS) comprising:
a plurality of displays, each of the displays including a first upstream-facing port (UFP), a second UFP, a downstream-facing port (DFP), and a multiplexer for selecting among the first UFP and the second UFP, wherein the DFP of each display is connected to the first UFP of its respective succeeding display so as to form a ring network topology of the displays, wherein a host computer is connected to the second UFP of a first display of the displays, the multiplexer of the first display configured to select the second UFP;
wherein the first display is configured, prior to the multiplexer of the first display selecting the second UFP, to send a message downstream via the DFP of the first display, wherein the message includes a unique random number, wherein the first display is configured to receive the message via the first UFP of the first display, and wherein the multiplexer of the first display is configured to select the second UFP after receipt of the message via the first UFP of the first display, wherein the plurality of displays are configured to maintain continuity of a configuration channel (CC) of the ring network topology regardless of selection of the second UFP of the first display by the multiplexer of the first display.
8. The IHS of claim 7 , wherein a second display of the plurality of displays is configured to receive the message sent by the first display via the first UFP of the second display, wherein the multiplexer of the second display of the plurality of displays is configured to maintain selection of the first UFP of the second display, and the second display of the plurality of displays is configured to relay via the DFP of the second display the message sent by the first display and received by the second display.
9. The IHS of claim 7 , wherein the first display is configured to send the message downstream, to receive the message via the first UFP, and to select the second UFP after receipt of the message in response to the host computer being connected to the second UFP of a first display.
10. The IHS of claim 7 , wherein the first upstream-facing port (UFP), the second UFP, and the downstream-facing port (DFP) of each of the plurality of displays are Universal Serial Bus Type C (USB-C) ports.
11. The IHS of claim 7 , wherein the first upstream-facing port (UFP), the second UFP, and the downstream-facing port (DFP) of each of the plurality of displays are Display Port (DP) ports.
12. A method comprising:
in a first display among a plurality of displays connected sequentially according to a ring network topology, sending, at a unidirectionally constrained downstream-facing port (DFP) of the first display, a message downstream via the displays, wherein the message includes a unique random number;
checking for receipt of the message via a first unidirectionally constrained upstream-facing port (UFP) of the first display; and
upon receipt of the message via the first unidirectionally constrained UFP of the first display, configuring a multiplexer to switch from selection of the first unidirectionally constrained UFP of the first display to selection of a second unidirectionally constrained UFP of the first display, wherein the first display is configured to maintain continuity of a configuration channel (CC) of the ring network topology regardless of selection of the second unidirectionally constrained UFP of the first display by the multiplexer.
13. The method of claim 12 , wherein the sending, at the unidirectionally constrained DFP of the first display, the message downstream via the plurality of displays is performed in response a host computer being connected to the second unidirectionally constrained UFP of the first display.
14. The method of claim 12 , wherein the first unidirectionally constrained UFP, the second unidirectionally constrained UFP, and the unidirectionally constrained DFP of the first display are Universal Serial Bus Type C (USB-C) ports.
15. The method of claim 12 , wherein the first unidirectionally constrained UFP, the second unidirectionally constrained UFP, and the unidirectionally constrained DFP of the first display are Display Port (DP) ports.
16. The method of claim 12 , further comprising:
in a second display of the plurality of displays, receiving the message sent downstream by the first display, wherein a second display multiplexer of the second display is configured to maintain selection of a second display first unidirectionally constrained UFP of the second display, wherein the second display is configured to relay via a second display unidirectionally constrained DFP of the second display the message sent by the first display and received by the second display.