[PATCH 4/4] ARM: tegra: pcie: Enable PCIe controller on Cardhu

[Jay Agarwal]

> > > So, if I apply this series, I do see the PCIe bridge and Ethernet
> > > device get enumerated, but I don't see the USB3 controller get
> > > enumerated. I believe that is a PCIe device behind the same bridge
> > > on the
> > same Tegra PCIe port.
> > > Shouldn't this device show up?
> > I have also reproduced this problem. I see somehow no non-
> > prefetchable memory is assigned to any of pcie devices.
> > Probably that is the reason for USB3 (pci 0000:04:00.0) not getting
> > enumerated since it uses only non-prefetchable memory.
> 
> 1. Bus4(on which usb3 device resides) always return 0xffffffff from it's
> config space. which means device is not present?
> 2. That's why it is not assigned any resources and hence no usb3 probe
> happens.
> 3. But same bus does return valid info like vendor/device id etc from it's
> config space in downstream kernel and hence usb3 probe does happen.
> 
> Thierry, Stephen,
> 4. Any idea why bus4 should return 0xffffffff values in upstream kernel?
> Anything missing?
> 5. Also, how config space of all pcie devices are mapped? I mean if I change
> the config space offset in dts file, then also I find correct vendor/device id
> etc for bus0/device0/fun0.
>     So how this mapping happens that even after changing the config space
> offset in PCIe address space, it always finds correct vendor/device id.

 Any idea on this?