linux-kernel - Re: [PATCH 1/6] pci, thunder: Add support for Thunder PCIe host controller

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Date:	Wed, 24 Sep 2014 17:49:46 +0100
From:	Will Deacon <will.deacon@....com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Robert Richter <rric@...nel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Liviu Dudau <Liviu.Dudau@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Robert Richter <rrichter@...ium.com>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	Sunil Goutham <sgoutham@...ium.com>
Subject: Re: [PATCH 1/6] pci, thunder: Add support for Thunder PCIe host
 controller

On Wed, Sep 24, 2014 at 05:12:26PM +0100, Arnd Bergmann wrote:
> On Wednesday 24 September 2014 17:37:43 Robert Richter wrote:
> > From: Sunil Goutham <sgoutham@...ium.com>
> > 
> > This patch adds support for PCI host controller of Cavium Thunder
> > SoCs.
> 
> I had expected this hardware to be SBSA compliant. Why do you need
> a hardware specific driver, is this a workaround for buggy hardware
> or just noncompliant?

Patches welcome to pci-host-generic.c :) Lorenzo already has code to port
it to Liviu's new API, so do shout if it's not suitable for your needs.

> > +static int thunder_pcie_msi_enable(struct thunder_pcie *pcie,
> > +					struct pci_bus *bus)
> > +{
> > +	struct device_node *msi_node;
> > +
> > +	msi_node = of_parse_phandle(pcie->node, "msi-parent", 0);
> > +	if (!msi_node)
> > +		return -ENODEV;
> > +
> > +	pcie->msi = of_pci_find_msi_chip_by_node(msi_node);
> > +	if (!pcie->msi)
> > +		return -ENODEV;
> > +
> > +	pcie->msi->dev = pcie->dev;
> > +	bus->msi = pcie->msi;
> > +
> > +	return 0;
> > +}
> 
> This is probably something we should add to the generic host driver as well,
> so it can work with SBSA compliant implementations that come with an MSI
> controller. Maybe move it into common code so it can be shared with that
> driver.

Agreed. I've been carrying something similar [1] (based on a hacked-up version
of bios32, so not bothered to post it) whilst I've been waiting for the
arm64 core PCI code to get merged.

Will

[1] https://git.kernel.org/cgit/linux/kernel/git/will/linux.git/commit/drivers/pci/host/pci-host-generic.c?h=iommu/pci&id=b719acf062ceccfbd79ee7b1ae0b7904ea4da27e
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