linux-kernel - RE: [PATCHv10 09/13] PCI: mobiveil: Add Header Type field check

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Message-ID: <DB8PR04MB674794A917F923FB565B044684EC0@DB8PR04MB6747.eurprd04.prod.outlook.com>
Date:   Mon, 24 Feb 2020 05:50:30 +0000
From:   "Z.q. Hou" <zhiqiang.hou@....com>
To:     Andrew Murray <amurray@...goodpenguin.co.uk>
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>,
        "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "andrew.murray@....com" <andrew.murray@....com>,
        "arnd@...db.de" <arnd@...db.de>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "l.subrahmanya@...iveil.co.in" <l.subrahmanya@...iveil.co.in>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "m.karthikeyan@...iveil.co.in" <m.karthikeyan@...iveil.co.in>,
        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: [PATCHv10 09/13] PCI: mobiveil: Add Header Type field check

Hi Andrew,

Thanks a lot for your review!

Thanks,
Zhiqiang

> -----Original Message-----
> From: Andrew Murray <amurray@...goodpenguin.co.uk>
> Sent: 2020年2月21日 1:31
> To: Z.q. Hou <zhiqiang.hou@....com>
> Cc: linux-pci@...r.kernel.org; linux-arm-kernel@...ts.infradead.org;
> devicetree@...r.kernel.org; linux-kernel@...r.kernel.org;
> bhelgaas@...gle.com; robh+dt@...nel.org; andrew.murray@....com;
> arnd@...db.de; mark.rutland@....com; l.subrahmanya@...iveil.co.in;
> shawnguo@...nel.org; m.karthikeyan@...iveil.co.in; Leo Li
> <leoyang.li@....com>; lorenzo.pieralisi@....com;
> catalin.marinas@....com; will.deacon@....com; Mingkai Hu
> <mingkai.hu@....com>; M.h. Lian <minghuan.lian@....com>; Xiaowei Bao
> <xiaowei.bao@....com>
> Subject: Re: [PATCHv10 09/13] PCI: mobiveil: Add Header Type field check
> 
> On Thu, Feb 13, 2020 at 12:06:40PM +0800, Zhiqiang Hou wrote:
> > From: Hou Zhiqiang <Zhiqiang.Hou@....com>
> >
> > Check the Header Type and exit from the host driver initialization if
> > it is not in host mode.
> >
> > Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@....com>
> 
> Reviewed-by: Andrew Murray <amurray@...goodpenguin.co.uk>
> 
> > ---
> > V10:
> >  - New patch separated from #10 of v9.
> >
> >  .../pci/controller/mobiveil/pcie-mobiveil-host.c    | 13 +++++++++++++
> >  1 file changed, 13 insertions(+)
> >
> > diff --git a/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c
> > b/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c
> > index 44dd641fede3..db7028788d91 100644
> > --- a/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c
> > +++ b/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c
> > @@ -554,6 +554,16 @@ static int mobiveil_pcie_interrupt_init(struct
> mobiveil_pcie *pcie)
> >  	return mobiveil_pcie_integrated_interrupt_init(pcie);
> >  }
> >
> > +static bool mobiveil_pcie_is_bridge(struct mobiveil_pcie *pcie) {
> > +	u32 header_type;
> > +
> > +	header_type = mobiveil_csr_readb(pcie, PCI_HEADER_TYPE);
> > +	header_type &= 0x7f;
> > +
> > +	return header_type == PCI_HEADER_TYPE_BRIDGE; }
> > +
> >  int mobiveil_pcie_host_probe(struct mobiveil_pcie *pcie)  {
> >  	struct mobiveil_root_port *rp = &pcie->rp; @@ -569,6 +579,9 @@ int
> > mobiveil_pcie_host_probe(struct mobiveil_pcie *pcie)
> >  		return ret;
> >  	}
> >
> > +	if (!mobiveil_pcie_is_bridge(pcie))
> > +		return -ENODEV;
> > +
> >  	/* parse the host bridge base addresses from the device tree file */
> >  	ret = pci_parse_request_of_pci_ranges(dev, &bridge->windows,
> >  					      &bridge->dma_ranges, NULL);
> > --
> > 2.17.1
> >