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

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Date:   Fri, 12 Apr 2019 09:00:41 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     "Z.q. Hou" <zhiqiang.hou@....com>
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: [PATCHv5 4/6] PCI: mobiveil: Add PCIe Gen4 RC driver for NXP
 Layerscape SoCs

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.

> +#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?

> +		dev_err(dev, "Poll PABRST&PABACT timeout.\n");

No need for punctuation at end of messages.