linux-kernel - Re: [PATCH] Kirin-PCIe: Add kirin pcie msi feature.

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Date:   Wed, 9 May 2018 12:51:53 +0800
From:   Shawn Guo <shawn.guo@...aro.org>
To:     Bjorn Helgaas <helgaas@...nel.org>
Cc:     Yao Chen <chenyao11@...wei.com>, songxiaowei@...ilicon.com,
        wangbinghui@...ilicon.com, lorenzo.pieralisi@....com,
        bhelgaas@...gle.com, xuwei5@...ilicon.com, robh+dt@...nel.org,
        mark.rutland@....com, catalin.marinas@....com, will.deacon@....com,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        dimitrysh@...gle.com, guodong.xu@...aro.org,
        Stanimir Varbanov <svarbanov@...sol.com>,
        Jianguo Sun <sunjianguo1@...wei.com>
Subject: Re: [PATCH] Kirin-PCIe: Add kirin pcie msi feature.

Hi Bjorn,

On Tue, May 08, 2018 at 07:56:58AM -0500, Bjorn Helgaas wrote:
...
> > +			return ret;
> > +		}
> > +	}
> > +
> > +	pci->pp.root_bus_nr = -1;
> 
> Setting root_bus_nr looks like an unrelated change that should be in a
> separate patch.
> 
> But I'm not sure why you need to set root_bus_nr at all, since
> dw_pcie_host_init() always sets it.
> 
> Some other callers of dw_pcie_host_init() do set it:
> 
>   exynos_add_pcie_port()
>   imx6_add_pcie_port()
>   armada8k_add_pcie_port()
>   artpec6_add_pcie_port()
>   dw_plat_add_pcie_port()
>   histb_pcie_probe()
>   qcom_pcie_probe()
>   spear13xx_add_pcie_port()
> 
> But I don't see *why* any of these need to set it.  If they don't need to
> set it, they shouldn't.

Mostly it's a blind copy of unnecessary code.  I tested histb driver
by dropping the line, and did not see anything broken.  I will cook up
a series to remove the code from all above drivers, and copy
corresponding driver owner to comment.

> And it would be nice if histb and qcom followed the structure and naming
> conventions of the other drivers, i.e., they should have
> histb_add_pcie_port() and qcom_add_pcie_port().

I can create a patch for histb driver, but will leave qcom one to
Stanimir to decide.

Shawn

> 
> >  	pci->pp.ops = &kirin_pcie_host_ops;
> >  
> >  	return dw_pcie_host_init(&pci->pp);
> > -- 
> > 1.9.1
> > 
> > 
> > _______________________________________________
> > linux-arm-kernel mailing list
> > linux-arm-kernel@...ts.infradead.org
> > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

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