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Message-ID: <20221126162313.kn7ibopmwwfwrfvx@pali> Date: Sat, 26 Nov 2022 17:23:13 +0100 From: Pali Rohár <pali@...nel.org> To: Michael Ellerman <mpe@...erman.id.au>, Benjamin Herrenschmidt <benh@...nel.crashing.org>, Paul Mackerras <paulus@...ba.org> Cc: linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH] powerpc/fsl-pci: Choose PCI host bridge with alias pci0 as the primary PING? On Tuesday 01 November 2022 23:19:09 Pali Rohár wrote: > Hello! I would like to remind this patch. > > On Sunday 09 October 2022 13:08:08 Pali Rohár wrote: > > Hello! Any opinion on this patch? > > > > On Saturday 20 August 2022 14:33:27 Pali Rohár wrote: > > > If there's no PCI host bridge with ISA then check for PCI host bridge with > > > alias "pci0" (first PCI host bridge) and if it exists then choose it as the > > > primary PCI host bridge. > > > > > > This makes choice of primary PCI host bridge more stable across boots and > > > updates as the last fallback candidate for primary PCI host bridge (if > > > there is no choice) is selected arbitrary. > > > > > > Signed-off-by: Pali Rohár <pali@...nel.org> > > > --- > > > arch/powerpc/sysdev/fsl_pci.c | 13 +++++++++++++ > > > 1 file changed, 13 insertions(+) > > > > > > diff --git a/arch/powerpc/sysdev/fsl_pci.c b/arch/powerpc/sysdev/fsl_pci.c > > > index 1011cfea2e32..e4b703943dd3 100644 > > > --- a/arch/powerpc/sysdev/fsl_pci.c > > > +++ b/arch/powerpc/sysdev/fsl_pci.c > > > @@ -1125,6 +1125,19 @@ void __init fsl_pci_assign_primary(void) > > > return; > > > } > > > > > > + /* > > > + * If there's no PCI host bridge with ISA then check for > > > + * PCI host bridge with alias "pci0" (first PCI host bridge). > > > + */ > > > + np = of_find_node_by_path("pci0"); > > > + if (np && of_match_node(pci_ids, np) && of_device_is_available(np)) { > > > + fsl_pci_primary = np; > > > + of_node_put(np); > > > + return; > > > + } > > > + if (np) > > > + of_node_put(np); > > > + > > > /* > > > * If there's no PCI host bridge with ISA, arbitrarily > > > * designate one as primary. This can go away once > > > -- > > > 2.20.1 > > >
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