linux-kernel - RE: [PATCH v5 3/3] pci:aer: add support aer interrupt with none MSI/MSI-X/INTx mode

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Date:   Wed, 21 Sep 2016 06:54:59 +0000
From:   Po Liu <po.liu@....com>
To:     Shawn Guo <shawnguo@...nel.org>
CC:     "linux-pci@...r.kernel.org" <linux-pci@...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>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        Roy Zang <roy.zang@....com>, Arnd Bergmann <arnd@...db.de>,
        Marc Zyngier <marc.zyngier@....com>,
        Stuart Yoder <stuart.yoder@....com>,
        Leo Li <leoyang.li@....com>,
        "M.H. Lian" <minghuan.lian@....com>,
        Murali Karicheri <m-karicheri2@...com>,
        "Bjorn Helgaas" <bhelgaas@...gle.com>,
        Mingkai Hu <mingkai.hu@....com>
Subject: RE: [PATCH v5 3/3] pci:aer: add support aer interrupt with none
 MSI/MSI-X/INTx mode

Hi Shawn,


>  -----Original Message-----
>  From: Shawn Guo [mailto:shawnguo@...nel.org]
>  Sent: Tuesday, September 20, 2016 8:39 PM
>  To: Po Liu
>  Cc: linux-pci@...r.kernel.org; linux-arm-kernel@...ts.infradead.org;
>  linux-kernel@...r.kernel.org; devicetree@...r.kernel.org; Roy Zang; Arnd
>  Bergmann; Marc Zyngier; Stuart Yoder; Leo Li; M.H. Lian; Murali
>  Karicheri; Bjorn Helgaas; Mingkai Hu
>  Subject: Re: [PATCH v5 3/3] pci:aer: add support aer interrupt with none
>  MSI/MSI-X/INTx mode
>  
>  On Sun, Sep 18, 2016 at 03:37:27AM +0000, Po Liu wrote:
>  > Hi Shawn,
>  >
>  >
>  > >  -----Original Message-----
>  > >  From: Shawn Guo [mailto:shawnguo@...nel.org]
>  > >  Sent: Sunday, September 18, 2016 8:52 AM
>  > >  To: Po Liu
>  > >  Cc: linux-pci@...r.kernel.org;
>  > > linux-arm-kernel@...ts.infradead.org;
>  > >  linux-kernel@...r.kernel.org; devicetree@...r.kernel.org; Roy Zang;
>  > > Arnd  Bergmann; Marc Zyngier; Stuart Yoder; Leo Li; M.H. Lian;
>  > > Murali  Karicheri; Bjorn Helgaas; Mingkai Hu
>  > >  Subject: Re: [PATCH v5 3/3] pci:aer: add support aer interrupt with
>  > > none  MSI/MSI-X/INTx mode
>  > >
>  > >  On Tue, Sep 13, 2016 at 12:40:59PM +0800, Po Liu wrote:
>  > >  > On some platforms, root port doesn't support MSI/MSI-X/INTx in RC
>  mode.
>  > >  > When chip support the aer interrupt with none MSI/MSI-X/INTx
>  > > mode,  > maybe there is interrupt line for aer pme etc. Search the
>  > > interrupt  > number in the fdt file. Then fixup the dev->irq with it.
>  > >  >
>  > >  > Signed-off-by: Po Liu <po.liu@....com>
>  > >
>  > >  Will the new kernel work with existing/old DTB?  I'm trying to
>  > > understand the dependency between driver and DTS changes.
>  >
>  > Yes, We've never use name 'intr' before. So we remove it is ok.
>  > 'aer' is a dts name for researching it's true interrupt number by
>  kernel. This patch is first time to use name 'aer'. So it must be
>  compatible with existing/old DTB.
>  
>  Does that mean driver and DTS changes can go through separate trees, i.e.
>  PCI and arm-soc, without introducing regressions on either tree?
>  Or does the patch series needs to go in as a whole?

Should be as a whole. The driver base on the dts. Or else, the driver would not found the 'aer' point.
Thanks!

Po

>  
>  Shawn