USB4 DisplayPort tunneling support was discovered in AMD Linux drivers.
It looks like future AMD processors will soon come with USB4 DisplayPort tunneling capability. PhoronixAccording to AMD Linux driver engineers are working on a new AMDGPU core graphics driver with support for USB4 DisplayPort tunneling technology.
The USB4 specification allows tunneling of DisplayPort 1.4 (also DisplayPort 2.0 Alternate Mode). The purpose of the work on the new AMDGPU driver is to handle DP connections over USB4.
We don’t know with which architecture USB4 will be used first, but it is said that Ryzen 6000 series APUs codenamed “Yellow Carp” and “Rembrandt” may have USB4 connectivity. So we can see USB4 adoption in laptops before desktop Ryzen processors and Radeon graphics cards.
Tunneling is a new feature for USB4 that comes from the port’s Thunderbolt 3 integration. This feature allows multiple protocols to run simultaneously, including USB, DisplayPort and PCIe. This is completely different from USB submode, which only allows one protocol to be used effectively at a time.
Alt mode can still be useful if you need all the USB bandwidth for a single protocol. However, tunneling can be more advantageous when you don’t need the full bandwidth available for a single connection (such as a USB port with multiple ports).
The new AMDGPU core graphics driver is nearing completion and may be available for Linux 5.16. This indicates that AMD is preparing for USB 4 support for next-generation CPUs or GPUs.
Source: Technopat by www.technopat.net.
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