Hi, This is v9 of the change to work around a PCIe link training phenomenon where a pair of devices both capable of operating at a link speed above 2.5GT/s seems unable to negotiate the link speed and continues training indefinitely with the Link Training bit switching on and off repeatedly and the data link layer never reaching the active state. With several requests addressed and a few extra issues spotted this version has now grown to 14 patches. It has been verified for device enumeration with and without PCI_QUIRKS enabled, using the same piece of RISC-V hardware as previously. Hot plug or reset events have not been verified, as this is difficult if at all feasible with hardware in question. Last iteration: <https://lore.kernel.org/r/alpine.DEB.2.21.2304060100160.13659@xxxxxxxxxxxxxxxxx/>, and my input to it: <https://lore.kernel.org/r/alpine.DEB.2.21.2306080224280.36323@xxxxxxxxxxxxxxxxx/>. Maciej
