From: Andy Isaacson <adi@hexapodia.org>
To: Ralf Baechle <ralf@linux-mips.org>
Cc: Bjorn Helgaas <bhelgaas@google.com>,
linux-mips@linux-mips.org,
Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
Jayachandran C <jchandra@broadcom.com>,
Ganesan Ramalingam <ganesanr@broadcom.com>,
David Daney <david.daney@cavium.com>,
linux-pci@vger.kernel.org,
Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
Yinghai Lu <yinghai@kernel.org>
Subject: Re: [PATCH] PCI: PCI_PROBE_ONLY clean-up
Date: Fri, 24 Jun 2016 11:46:02 -0700 [thread overview]
Message-ID: <20160624184602.GG32461@hexapodia.org> (raw)
In-Reply-To: <20160624155021.GD5930@linux-mips.org>
On Fri, Jun 24, 2016 at 05:50:21PM +0200, Ralf Baechle wrote:
> > bcm1480
> > Andrew Isaacson <adi@broadcom.com>
> > dc41f94f7709 ("Support for the BCM1480 on-chip PCI-X bridge.")
> >
> > ip27
> > Thomas Bogendoerfer <tsbogend@alpha.franken.de>
> > 96173a6c4ebc ("[MIPS] IP27: misc fixes")
>
> Afair I did originally implement the IP27 use of PCI_PROBE_ONLY. The
> problem is that it was not possible for the kernel to assign resources
> properly on an IP27. Also that would invalidate firmware configuration
> information, so we had to live with whatever the firmware (mis)configured
> for us. Afair - it's a darn long time ... I think the reasoning for
> the BCM1480 was similar but Andy will hopefully recall the details.
I don't remember the details, unfortunately, but my general recollection
is similar -- CFE on bcm1480 was doing a fairly good job of configuring
PCI, and I think we needed to preserve the configuration for Reasons
rather than letting the kernel change things away from the CFE setup.
I unfortunately no longer have any 1480 hardware to test on, nor do I
know who's left at BCM who might be able to validate this change.
-andy
next prev parent reply other threads:[~2016-06-24 18:46 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-23 22:16 [PATCH] PCI: PCI_PROBE_ONLY clean-up Bjorn Helgaas
2016-06-23 22:16 ` [PATCH] MIPS/PCI: Claim bus resources on PCI_PROBE_ONLY set-ups Bjorn Helgaas
2016-10-17 4:36 ` Joshua Kinard
2016-10-17 18:09 ` Lorenzo Pieralisi
2016-10-18 0:30 ` Joshua Kinard
2016-10-19 11:04 ` Lorenzo Pieralisi
2016-10-31 19:36 ` Joshua Kinard
2016-11-01 4:06 ` Lorenzo Pieralisi
2016-06-24 15:50 ` [PATCH] PCI: PCI_PROBE_ONLY clean-up Ralf Baechle
2016-06-24 18:46 ` Andy Isaacson [this message]
2016-06-24 22:35 ` Ralf Baechle
2016-06-24 23:24 ` Joshua Kinard
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