linux-kernel - RE: [EXT] Re: [PATCHv5 4/6] PCI: mobiveil: Add PCIe Gen4 RC driver for NXP Layerscape SoCs

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Date:   Sun, 14 Apr 2019 11:16:18 +0000
From:   "Z.q. Hou" <zhiqiang.hou@....com>
To:     Bjorn Helgaas <helgaas@...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>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "l.subrahmanya@...iveil.co.in" <l.subrahmanya@...iveil.co.in>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        Leo Li <leoyang.li@....com>,
        "lorenzo.pieralisi@....com" <lorenzo.pieralisi@....com>,
        "catalin.marinas@....com" <catalin.marinas@....com>,
        "will.deacon@....com" <will.deacon@....com>,
        Mingkai Hu <mingkai.hu@....com>,
        "M.h. Lian" <minghuan.lian@....com>,
        Xiaowei Bao <xiaowei.bao@....com>
Subject: RE: [EXT] Re: [PATCHv5 4/6] PCI: mobiveil: Add PCIe Gen4 RC driver
 for NXP Layerscape SoCs

Hi Bjorn,

Thanks a lot for your comments!

> -----Original Message-----
> From: Bjorn Helgaas [mailto:helgaas@...nel.org]
> Sent: 2019年4月12日 22:01
> To: Z.q. Hou <zhiqiang.hou@....com>
> Cc: linux-pci@...r.kernel.org; linux-arm-kernel@...ts.infradead.org;
> devicetree@...r.kernel.org; linux-kernel@...r.kernel.org;
> robh+dt@...nel.org; mark.rutland@....com; l.subrahmanya@...iveil.co.in;
> shawnguo@...nel.org; Leo Li <leoyang.li@....com>;
> lorenzo.pieralisi@....com; catalin.marinas@....com;
> will.deacon@....com; Mingkai Hu <mingkai.hu@....com>; M.h. Lian
> <minghuan.lian@....com>; Xiaowei Bao <xiaowei.bao@....com>
> Subject: [EXT] Re: [PATCHv5 4/6] PCI: mobiveil: Add PCIe Gen4 RC driver for
> NXP Layerscape SoCs
> 
> WARNING: This email was created outside of NXP. DO NOT CLICK links or
> attachments unless you recognize the sender and know the content is safe.
> 
> 
> 
> On Fri, Apr 12, 2019 at 09:52:50AM +0000, Z.q. Hou wrote:
> > From: Hou Zhiqiang <Zhiqiang.Hou@....com>
> >
> > This PCIe controller is based on the Mobiveil GPEX IP, which is
> > compatible with the PCI Express™ Base Specification, Revision 4.0.
> >
> > Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@....com>
> > Reviewed-by: Minghuan Lian <Minghuan.Lian@....com>
> > ---
> > V5:
> >  - Corrected the subject.
> >  - Corrected 2 typos.
> >  - Updated the Copyright and driver description.
> >  - Changed to use BIT(x) to define verious functions of register's bits.
> >  - Unified the capitalization of error info.
> >  - Changed the IRQ handler name to ls_pcie_g4_isr().
> >  - Change 'irq' to 'IRQ' in error info.
> >  - Trimmed some functions without functionality change.
> >
> >  drivers/pci/controller/mobiveil/Kconfig       |  10 +
> >  drivers/pci/controller/mobiveil/Makefile      |   1 +
> 
> >  .../controller/mobiveil/pci-layerscape-gen4.c | 256
> > ++++++++++++++++++
> 
> I would probably name this "pcie-layerscape-gen4.c" ("pcie" instead of "pci"),
> since that's more typical and this really is PCIe-specific.

Yes, this can be arranged in v6.

> 
> > +#define PCIE_PF_DBG                  0x7fc
> > +#define PF_DBG_LTSSM_MASK            0x3f
> > +#define PF_DBG_WE                    BIT(31)
> > +#define PF_DBG_PABR                  BIT(27)
> > +
> > +#define LS_PCIE_G4_LTSSM_L0          0x2d /* L0 state */
> 
> Maybe rename this and move it to make it obvious that it's related to
> PF_DBG_LTSSM_MASK?

Yes, will rename it in v6.

> 
> > +             dev_err(dev, "Poll PABRST&PABACT timeout.\n");
> 
> No need for punctuation at end of messages.

Will remove them in v6.

Thanks,
Zhiqiang