NVIDIA Turing GPU [1] has hardware support for USB Type-C and VirtualLink [2]. The Turing GPU is a multi-function PCI device which has the following four functions: - VGA display controller (Function 0) - Audio controller (Function 1) - USB xHCI Host controller (Function 2) - USB Type-C USCI controller (Function 3) Currently NVIDIA and Nouveau GPU drivers only manage function 0. Rest of the functions are managed by other drivers. These functions internally in the hardware are tightly coupled. When function 0 goes in runtime suspended state, then it will do power gating for most of the hardware blocks. Some of these hardware blocks are used by the other PCI functions, which leads to functional failure. In the mainline kernel, the device link is present between function 0 and function 1. This patch series deals with creating a similar kind of device link between function 0 and functions 2 and 3. [1] https://www.nvidia.com/content/dam/en-zz/Solutions/design-visualization/technologies/turing-architecture/NVIDIA-Turing-Architecture-Whitepaper.pdf [2] https://en.wikipedia.org/wiki/VirtualLink Abhishek Sahu (2): PCI: Code reorganization for VGA device link PCI: Create device link for NVIDIA GPU drivers/pci/quirks.c | 67 ++++++++++++++++++++++++++++++++++---------- 1 file changed, 52 insertions(+), 15 deletions(-) -- 2.17.1
