BUG: no PCI/PCIe devices found in 85xx architecture

[Scott Wood]

On 06/25/2013 01:40:14 PM, Stefani Seibold wrote:
> Hi,
> 
> there is a bug in kernel 3.9 which the new fsl_pci platform driver.  
> The
> pcibios_init in pci_32.c will be called before the platform driver  
> probe
> will be invoked.
> 
> The call order for a p2020 board with linux 3.9 is currently:
> 
> fsl_pci_init
> pcibios_init
> fsl_pci_probe
> fsl_pci_probe
> fsl_pci_probe
> 
> Therefore the PCI/PCIe bridge will be added after the PCI/PCIe busses
> was scanned for devices. So no PCI/PCIe devices are available.
> 
> Everything works fine by reverting the fsl_pci.[ch] to the version in
> linux 3.4, because the PCI/PCIe bridges will be added in
> the ..._setup_arch() function, before the pcibios_init function is
> called.
> 
> Any solution for this issue?

I can't reproduce this on p3041 -- pcibios_init gets called after  
fsl_pci_probe, and its PCIe e1000 gets detected and used.

fsl_pci_probe should be called when of_platform_bus_probe is called,  
which is in a machine_arch_initcall.  pcibios_init is a  
subsys_initcall, which should happen later.

Which p2020 board are you using?  Could you check when it is calling  
of_platform_bus_probe?

-Scott