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

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Message-ID: <20180510133350.GH173327@bhelgaas-glaptop.roam.corp.google.com>
Date:   Thu, 10 May 2018 08:33:50 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Shawn Guo <shawn.guo@...aro.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.

On Wed, May 09, 2018 at 12:51:53PM +0800, Shawn Guo wrote:
> 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.

Thanks, Shawn, I really appreciate that!

> > 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.

Sounds good, thanks again!