[PATCH] SB600 for the Nemo board has non-zero devices on non-root bus

I mean: I haven't gotten an answer from Darren yet. Sorry because of my English. I am still learning.

-- Christian


On 22 December 2017 at 10:57AM, Christian Zigotzky wrote:

Hi Bjorn,

Sorry I'm bothering you again. Is this small out of tree init routine in the Nemo patch? I haven't get an answer from Darren yet and I didn't found the small out of tree init routine in the Nemo patch. Please find attached the Nemo patch. Maybe you can find this small out of tree init routine.

What do you think of this following code?

if (sb600_bus == -1)
+       {
+               busp = pci_find_bus(0, 0);
+               pa_pxp_read_config(busp, PCI_DEVFN(17,0), PCI_SECONDARY_BUS, 1, &val);
+
+               sb600_bus = val;
+
+               printk(KERN_CRIT "NEMO SB600 on bus %d.\n",sb600_bus);
+       }

Thanks,
Christian


On 04 December 2017 at 12:40PM, Darren Stevens wrote:

quoted

Hello Bjorn

Firstly sorry for not being able to join in this discussion, I have been
moving house and only got my X1000 set up again yesterday..

On 30/11/2017, Bjorn Helgaas wrote:

quoted

I *think* something like the patch below should make this work if you
use the "pci=pcie_scan_all" parameter.  We have some x86 DMI quirks
that set PCI_SCAN_ALL_PCIE_DEVS automatically.  I don't know how to do
something similar on powerpc, but maybe you do?

Actually the root ports on the Nemo's PA6T processor don't respond to the
SB600 unless we turn on a special 'relax pci-e' bit in one of its control
registers. We use a small out of tree init routine to do this, and there
would be the ideal place to put a call to
pci_set_flag(PCI_SCAN_ALL_PCIE_DEVS).

This patch fixes the last major hurdle to getting the X1000 fully supported in
the linux kernel, so thanks very much for that.

Regards
Darren