[PATCH 1/1] PCI set flag PCI_SCAN_ALL_PCIE_DEVS for P.A. Semi boards

Michael Ellerman mpe at ellerman.id.au
Tue Mar 20 09:32:14 AEDT 2018

Bjorn Helgaas <helgaas at kernel.org> writes:

> On Fri, Mar 16, 2018 at 01:55:36PM +0100, Christian Zigotzky wrote:
>> Bjorn Helgaas created a patch for making PCI_SCAN_ALL_PCIE_DEVS work for
>> Root Ports as well as Downstream. Previously PCI_SCAN_ALL_PCIE_DEVS (set by
>> quirks or the "pci=pcie_scan_all"
>> kernel parameter) only affected Switch Downstream Ports, not Root Ports. The
>> problem is, that we have to add always the boot argument "pci=pcie_scan_all"
>> for using Bjorn's improvements. Without the boot argument
>> "pci=pcie_scan_all", the kernel doesn't boot on P.A. Semi boards with SB600
>> chipset (SB600 chipset is connected via PCIe x4 to the P.A. Semi’s
>> PA6T-1682M System-on-a-Chip) because the kernel can't find any drives
>> connected to the SB600 anymore. Olof Johansson has created a patch for
>> executing "pci=pcie_scan_all" automatically on P.A. Semi boards. With his
>> patch, we don't need to add 'pci=pcie_scan_all' to the kernel boot arguments
>> anymore.
> The patch looks fine, but I need a signed-off-by line before I can apply
> it.  See https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/process/submitting-patches.rst

I'm happy to take it, I've been meaning to check if Olof sent a SOB in
his original mail but haven't got to it.


Yes, he did, see below.

So I'll merge that, I'll add a Tested-by for you Christian.

Christian please don't remove any of the tags when submitting other
peoples' patches in future.


>From a3b390277627b0342c8ccfc16e58679e0d8abdde Mon Sep 17 00:00:00 2001
From: Olof Johansson <olof at lixom.net>
Date: Sat, 2 Dec 2017 14:56:36 -0800
Subject: [PATCH] powerpc/pasemi: set PCI_SCAN_ALL_PCI_DEVS

Needed on Amiga X1000 with SB600.

Reported-by: Christian Zigotzky <chzigotzky at xenosoft.de>
Cc: Bjorn Helgaas <bhelgaas at google.com>
Signed-off-by: Olof Johansson <olof at lixom.net>
 arch/powerpc/platforms/pasemi/pci.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/powerpc/platforms/pasemi/pci.c b/arch/powerpc/platforms/pasemi/pci.c
index 5ff6108..ea54ed2 100644
--- a/arch/powerpc/platforms/pasemi/pci.c
+++ b/arch/powerpc/platforms/pasemi/pci.c
@@ -224,6 +224,8 @@ void __init pas_pci_init(void)

+	pci_set_flag(PCI_SCAN_ALL_PCIE_DEVS):
	for (np = NULL; (np = of_get_next_child(root, np)) != NULL;)
		if (np->name && !strcmp(np->name, "pxp") && !pas_add_bridge(np))

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