linux-kernel - Re: [PATCH V3 3/5] PCI: xilinx: Modifying AXI PCIe Host Bridge driver to work on both Zynq and Microblaze

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Date:	Wed, 10 Feb 2016 21:40:11 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Paul Burton <paul.burton@...tec.com>
Cc:	Bharat Kumar Gogada <bharat.kumar.gogada@...inx.com>,
	"bhelgaas@...gle.com" <bhelgaas@...gle.com>,
	Michal Simek <michals@...inx.com>,
	"lorenzo.pieralisi@....com" <lorenzo.pieralisi@....com>,
	"yinghai@...nel.org" <yinghai@...nel.org>,
	"wangyijing@...wei.com" <wangyijing@...wei.com>,
	"robh@...nel.org" <robh@...nel.org>,
	"russell.joyce@...k.ac.uk" <russell.joyce@...k.ac.uk>,
	Soren Brinkmann <sorenb@...inx.com>,
	"jiang.liu@...ux.intel.com" <jiang.liu@...ux.intel.com>,
	"pawel.moll@....com" <pawel.moll@....com>,
	"mark.rutland@....com" <mark.rutland@....com>,
	"ijc+devicetree@...lion.org.uk" <ijc+devicetree@...lion.org.uk>,
	"galak@...eaurora.org" <galak@...eaurora.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	Ravikiran Gummaluri <rgummal@...inx.com>
Subject: Re: [PATCH V3 3/5] PCI: xilinx: Modifying AXI PCIe Host Bridge driver to work on both  Zynq and Microblaze

On Wednesday 10 February 2016 09:27:07 Paul Burton wrote:
> On Wed, Feb 10, 2016 at 05:55:51AM +0000, Bharat Kumar Gogada wrote:
> > > On Tue, Feb 09, 2016 at 04:11:56PM +0530, Bharat Kumar Gogada wrote:
> > > > Modifying Xilinx AXI PCIe Host Bridge Soft IP driver to work on both
> > > > Zynq and Microblaze Architectures.
> > > > With these modifications drivers/pci/host/pcie-xilinx.c, will work on
> > > > both Zynq and Microblaze Architectures.
> > > >
> > > > Signed-off-by: Bharat Kumar Gogada <bharatku@...inx.com>
> > > > Signed-off-by: Ravi Kiran Gummaluri <rgummal@...inx.com>
> > > > ---
> > > > Changes:
> > > > Removed unneccessary architecture dependent number of MSI's.
> > > > Added #ifdef to pci_fixup_irqs which is ARM specific API.
> > > 
> > > Hi Bharat,
> > > 
> > > Why do you say pci_fixup_irqs is ARM-specific? It's declared in
> > > include/linux/pci.h, defined in drivers/pci/setup-irq.c & used by multiple
> > > architectures (alpha, arm, m68k, mips, sh, sparc, tile,
> > > unicore32 from a quick grep).
> > > 
> > > Will you not break INTX-style interrupts by removing this?
> > > 
> > I meant to say ARM specific w.r.t Microblaze architecture, which is
> > what this patch series are for. This has been already discussed in my
> > previous patch by  Arnd Bergmann and Lorenzo Pieralisi .
> > (https://lkml.org/lkml/2016/1/12/707)
> 
> Hi Bharat,
> 
> Ok, so you don't need it for microblaze but do need it for zynq/ARM. We
> also need it for MIPS, where my recent patches enable this driver. So if
> #ifdef'ing this is the current way forwards could you please invert the
> condition to #ifndef CONFIG_MICROBLAZE?

I think we are getting to the point where we should try much harder
to make sure nobody needs that hack and it all works out of the box.

	Arnd