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

From: Christian Zigotzky <chzigotzky@xenosoft.de>
To: Darren Stevens <darren@stevens-zone.net>
Cc: Bjorn Helgaas <helgaas@kernel.org>,
	Bjorn Helgaas <bhelgaas@google.com>,
	linuxppc-dev <linuxppc-dev@lists.ozlabs.org>,
	linux-pci@vger.kernel.org, olof@lixom.net
Subject: SB600 for the Nemo board has non-zero devices on non-root bus
Date: Mon, 4 Dec 2017 14:31:52 +0100	[thread overview]
Message-ID: <9AED1664-A71D-4C15-A828-E64DF5C0498C@xenosoft.de> (raw)
In-Reply-To: <4b18f51024d.45f899c9@auth.smtp.1and1.co.uk>

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Darren,

What do you think about Olof’s solution?

Link: http://forum.hyperion-entertainment.biz/viewtopic.php?f=35&t=3891&p=43206#p43201

Thanks,
Christian

Sent from my iPhone

> On 4. Dec 2017, at 12:40, Darren Stevens <darren@stevens-zone.net> wrote:
> 
> 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:
>> 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
> 

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