Bjorn Helgaas <helgaas@xxxxxxxxxx> writes: > On Fri, Dec 01, 2017 at 06:27:10PM -0600, Bjorn Helgaas wrote: >> From: Bjorn Helgaas <bhelgaas@xxxxxxxxxx> >> >> PCIe Downstream Ports normally have only a Device 0 below them. To >> optimize enumeration, we don't scan for other devices *unless* the >> PCI_SCAN_ALL_PCIE_DEVS flag is set by set by quirks or the >> "pci=pcie_scan_all" kernel parameter. >> >> Previously PCI_SCAN_ALL_PCIE_DEVS only affected scanning below Switch >> Downstream Ports, not Root Ports. >> >> But the "Nemo" system, also known as the AmigaOne X1000, has a PA Semi Root >> Port whose link leads to an AMD/ATI SB600 South Bridge. The Root Port is a >> PCIe device, of course, but the SB600 contains only conventional PCI >> devices with no visible PCIe port. >> >> Simplify and restructure only_one_child() so that we scan for all possible >> devices below Root Ports as well as Switch Downstream Ports when >> PCI_SCAN_ALL_PCIE_DEVS is set. >> >> This is enough to make Nemo work with "pci=pcie_scan_all". We would also >> like to add a quirk to set PCI_SCAN_ALL_PCIE_DEVS automatically on Nemo so >> users wouldn't have to use the "pci=pcie_scan_all" parameter, but we don't >> have that yet. >> >> Link: https://lkml.kernel.org/r/CAErSpo55Q8Q=5p6_+uu7ahnw+53ibVDNRXxrzRV9QnUr_9EUfw@xxxxxxxxxxxxxx >> Link: https://bugzilla.kernel.org/show_bug.cgi?id=198057 >> Reported-and-Tested-by: Christian Zigotzky <chzigotzky@xxxxxxxxxxx> >> Signed-off-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx> > > Applied to pci/enumeration for v4.16. Thanks Bjorn. cheers
