linux-kernel - Re: [PATCH v5 4/9] PCI: mediatek: Convert to use pci_host

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Date:   Sat, 29 Sep 2018 08:16:45 +0800
From:   Honghui Zhang <honghui.zhang@...iatek.com>
To:     Ryder Lee <ryder.lee@...iatek.com>
CC:     <lorenzo.pieralisi@....com>, <bhelgaas@...gle.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>, <linux-pci@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <ulf.hansson@...aro.org>,
        <marc.zyngier@....com>, <matthias.bgg@...il.com>,
        <devicetree@...r.kernel.org>, <yingjoe.chen@...iatek.com>,
        <eddie.huang@...iatek.com>, <youlin.pei@...iatek.com>,
        <yt.shen@...iatek.com>, <sean.wang@...iatek.com>
Subject: Re: [PATCH v5 4/9] PCI: mediatek: Convert to use pci_host_probe()

On Fri, 2018-09-28 at 23:41 +0800, Ryder Lee wrote:
> On Fri, 2018-09-28 at 18:04 +0800, honghui.zhang@...iatek.com wrote:
> > From: Honghui Zhang <honghui.zhang@...iatek.com>
> > 
> > Part of mtk_pcie_register_host is an open-coded version of
> > pci_host_probe(). So instead of duplicating this code, use
> > pci_host_probe() directly and remove mtk_pcie_register_host.
> > 
> > Signed-off-by: Honghui Zhang <honghui.zhang@...iatek.com>
> > ---
> >  drivers/pci/controller/pcie-mediatek.c | 37 ++++++++--------------------------
> >  1 file changed, 8 insertions(+), 29 deletions(-)
> > 
> > diff --git a/drivers/pci/controller/pcie-mediatek.c b/drivers/pci/controller/pcie-mediatek.c
> > index e2c4127..cbf4543 100644
> > --- a/drivers/pci/controller/pcie-mediatek.c
> > +++ b/drivers/pci/controller/pcie-mediatek.c
> > @@ -1125,34 +1125,6 @@ static int mtk_pcie_request_resources(struct mtk_pcie *pcie)
> >  	return 0;
> >  }
> >  
> > -static int mtk_pcie_register_host(struct pci_host_bridge *host)
> > -{
> > -	struct mtk_pcie *pcie = pci_host_bridge_priv(host);
> > -	struct pci_bus *child;
> > -	int err;
> 
> To make the patch simple, could we keep these host->*. and return
> pci_host_probe() directly?

Well, I guess it's not necessary to keep the mtk_pcie_register_host just
wrap pci_host_probe(). Put those host->* directly in probe function is
no harm, it will reduce one function call and related parameter passing.

I may update this patch to keep the mtk_pcie_register_host if you insist
though I prefer the current way.

Thanks.
> 
> > -	host->busnr = pcie->busn.start;
> > -	host->dev.parent = pcie->dev;
> > -	host->ops = pcie->soc->ops;
> > -	host->map_irq = of_irq_parse_and_map_pci;
> > -	host->swizzle_irq = pci_common_swizzle;
> > -	host->sysdata = pcie;
> > -
> > -	err = pci_scan_root_bus_bridge(host);
> > -	if (err < 0)
> > -		return err;
> > -
> > -	pci_bus_size_bridges(host->bus);
> > -	pci_bus_assign_resources(host->bus);
> > -
> > -	list_for_each_entry(child, &host->bus->children, node)
> > -		pcie_bus_configure_settings(child);
> > -
> > -	pci_bus_add_devices(host->bus);
> > -
> > -	return 0;
> > -}
> > -
> >  static int mtk_pcie_probe(struct platform_device *pdev)
> >  {
> >  	struct device *dev = &pdev->dev;
> > @@ -1179,7 +1151,14 @@ static int mtk_pcie_probe(struct platform_device *pdev)
> >  	if (err)
> >  		goto put_resources;
> >  
> > -	err = mtk_pcie_register_host(host);
> > +	host->busnr = pcie->busn.start;
> > +	host->dev.parent = pcie->dev;
> > +	host->ops = pcie->soc->ops;
> > +	host->map_irq = of_irq_parse_and_map_pci;
> > +	host->swizzle_irq = pci_common_swizzle;
> > +	host->sysdata = pcie;
> > +
> > +	err = pci_host_probe(host);
> >  	if (err)
> >  		goto put_resources;
> >  
> 
>