• Aaron Sierra's avatar
    powerpc: fsl_pci: Add forced PCI Agent enumeration · 00406e87
    Aaron Sierra authored
    The following commit prevents the MPC8548E on the XPedite5200 PrPMC
    module from enumerating its PCI/PCI-X bus:
    
        powerpc/fsl-pci: use 'Header Type' to identify PCIE mode
    
    The previous patch prevents any Freescale PCI-X bridge from enumerating
    the bus, if it is hardware strapped into Agent mode.
    
    In PCI-X, the Host is responsible for driving the PCI-X initialization
    pattern to devices on the bus, so that they know whether to operate in
    conventional PCI or PCI-X mode as well as what the bus timing will be.
    For a PCI-X PrPMC, the pattern is driven by the mezzanine carrier it is
    installed onto. Therefore, PrPMCs are PCI-X Agents, but one per system
    may still enumerate the bus.
    
    This patch causes the device node of any PCI/PCI-X bridge strapped into
    Agent mode to be checked for the fsl,pci-agent-force-enum property. If
    the property is present in the node, the bridge will be allowed to
    enumerate the bus.
    
    Cc: Minghuan Lian <Minghuan.Lian@freescale.com>
    Signed-off-by: default avatarAaron Sierra <asierra@xes-inc.com>
    Signed-off-by: default avatarScott Wood <scottwood@freescale.com>
    00406e87
fsl,pci.txt 811 Bytes