linux-kernel - Re: 答复: [PATCH v5 1/1] PCI: kirin: Add MSI support

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Message-ID: <20180710154017.GA16825@red-moon>
Date:   Tue, 10 Jul 2018 16:40:17 +0100
From:   Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To:     "Songxiaowei (Kirin_DRV)" <songxiaowei@...ilicon.com>
Cc:     "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "chenyao (F)" <chenyao11@...wei.com>
Subject: Re: 答复: [PATCH v5 1/1] PCI: kirin:
 Add MSI support

On Mon, Jul 09, 2018 at 01:54:07AM +0000, Songxiaowei (Kirin_DRV) wrote:
> Hi Bjorn Helgaas,
> 
> Would you help to review this patch?
> 
> Best regards,
> 
> Xiaowei.
> 
> > -----邮件原件-----
> > 发件人: Songxiaowei (Kirin_DRV)
> > 发送时间: 2018年6月28日 20:48
> > 收件人: Wangbinghui <wangbinghui@...ilicon.com>; bhelgaas@...gle.com;
> > robh+dt@...nel.org; linux-pci@...r.kernel.org; linux-kernel@...r.kernel.org;
> > dimitrysh@...gle.com
> > 抄送: chenyao (F) <chenyao11@...wei.com>; Songxiaowei (Kirin_DRV)
> > <songxiaowei@...ilicon.com>
> > 主题: [PATCH v5 1/1] PCI: kirin: Add MSI support
> > 
> > Add support for MSI.
> > 
> > Signed-off-by: Xiaowei Song <songxiaowei@...ilicon.com>
> > ---
> >  drivers/pci/dwc/pcie-kirin.c | 28 ++++++++++++++++++++++++++++
> >  1 file changed, 28 insertions(+)
> > 
> > diff --git a/drivers/pci/dwc/pcie-kirin.c b/drivers/pci/dwc/pcie-kirin.c index
> > d2970a009eb5..6997276eb69c 100644
> > --- a/drivers/pci/dwc/pcie-kirin.c
> > +++ b/drivers/pci/dwc/pcie-kirin.c
> > @@ -430,6 +430,9 @@ static int kirin_pcie_host_init(struct pcie_port *pp)
> > {
> >  	kirin_pcie_establish_link(pp);
> > 
> > +	if (IS_ENABLED(CONFIG_PCI_MSI))
> > +		dw_pcie_msi_init(pp);
> > +
> >  	return 0;
> >  }
> > 
> > @@ -445,9 +448,34 @@ static const struct dw_pcie_host_ops
> > kirin_pcie_host_ops = {
> >  	.host_init = kirin_pcie_host_init,
> >  };
> > 
> > +static int kirin_pcie_add_msi(struct dw_pcie *pci,
> > +				struct platform_device *pdev)
> > +{
> > +	int ret = 0;
> > +
> > +	if (IS_ENABLED(CONFIG_PCI_MSI)) {
> > +		ret = platform_get_irq(pdev, 0);
> > +		if (ret < 0) {
> > +			dev_err(&pdev->dev,
> > +				"failed to get MSI IRQ (%d)\n", ret);
> > +			return ret;
> > +		}
> > +
> > +		pci->pp.msi_irq = ret;
> > +	}
> > +
> > +	return ret;
> > +}
> > +
> >  static int __init kirin_add_pcie_port(struct dw_pcie *pci,
> >  				      struct platform_device *pdev)  {
> > +	int ret;
> > +
> > +	ret = kirin_pcie_add_msi(pci, pdev);
> > +	if (ret)
> > +		return ret;

If kirin_pcie_add_msi() returns an IRQ number we return from
this function here, is that what you really want ?

Lorenzo

> > +
> >  	pci->pp.ops = &kirin_pcie_host_ops;
> > 
> >  	return dw_pcie_host_init(&pci->pp);
> > --
> > 2.11.GIT
>