Re: [PATCH] ARM: fix debug prints relevant to PCI devices

From: Russell King - ARM Linux
Date: Wed Jun 04 2014 - 19:50:05 EST

On Wed, Jun 04, 2014 at 01:29:14PM -0600, Stephen Warren wrote:
> On 06/04/2014 01:17 PM, Vidya Sagar wrote:
> > As per PCIe spec, fast back-to-back transactions feature
> > is not applicable to PCIe devices. Hence, do not print
> > that fast back-to-back trasactions are disabled when
> > there is a PCIe device found on the bus
> > @@ -298,6 +299,8 @@ void pcibios_fixup_bus(struct pci_bus *bus)
> > list_for_each_entry(dev, &bus->devices, bus_list) {
> > u16 status;
> >
> > + if (!has_pcie_dev)
> > + has_pcie_dev = pci_pcie_cap(dev);
> This sets the flag if any PCIe device is detected, even if regular PCI
> devices are also detected. I assume the two can be mixed on a bus if
> there's a bridge (although perhaps that would be separate buses, and
> child buses don't get traversed by this function?)

This function gets caller per PCI bus - if there's a bridge between
(which there should be between PCIe and PCI) then they are by definition
separate buses. (I'm guessing that there aren't transparent bridges
between PCI and PCIe.)

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