linux-kernel - RE: [PATCH] PCI: designware-ep: Fix the Header Type check

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Message-ID: <HE1PR0402MB3371A9E1DDC8C6F2CFE71968845E0@HE1PR0402MB3371.eurprd04.prod.outlook.com>
Date:   Sun, 16 Aug 2020 16:35:44 +0000
From:   "Z.q. Hou" <zhiqiang.hou@....com>
To:     Rob Herring <robh@...nel.org>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        PCI <linux-pci@...r.kernel.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Andrew Murray <amurray@...goodpenguin.co.uk>,
        Jingoo Han <jingoohan1@...il.com>,
        Gustavo Pimentel <gustavo.pimentel@...opsys.com>
Subject: RE: [PATCH] PCI: designware-ep: Fix the Header Type check

Hi Rob,

Thanks a lot for your comments!

> -----Original Message-----
> From: Rob Herring [mailto:robh@...nel.org]
> Sent: 2020年8月14日 23:51
> To: Z.q. Hou <zhiqiang.hou@....com>
> Cc: linux-kernel@...r.kernel.org; PCI <linux-pci@...r.kernel.org>; Lorenzo
> Pieralisi <lorenzo.pieralisi@....com>; Bjorn Helgaas
> <bhelgaas@...gle.com>; Andrew Murray <amurray@...goodpenguin.co.uk>;
> Jingoo Han <jingoohan1@...il.com>; Gustavo Pimentel
> <gustavo.pimentel@...opsys.com>
> Subject: Re: [PATCH] PCI: designware-ep: Fix the Header Type check
> 
> On Fri, Aug 14, 2020 at 2:15 AM Zhiqiang Hou <Zhiqiang.Hou@....com>
> wrote:
> >
> > From: Hou Zhiqiang <Zhiqiang.Hou@....com>
> >
> > The current check will result in the multiple function device fails to
> > initialize. So fix the check by masking out the multiple function bit.
> >
> > Fixes: 0b24134f7888 ("PCI: dwc: Add validation that PCIe core is set
> > to correct mode")
> > Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@....com>
> > ---
> >  drivers/pci/controller/dwc/pcie-designware-ep.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/pci/controller/dwc/pcie-designware-ep.c
> > b/drivers/pci/controller/dwc/pcie-designware-ep.c
> > index 4680a51c49c0..4b7abfb1e669 100644
> > --- a/drivers/pci/controller/dwc/pcie-designware-ep.c
> > +++ b/drivers/pci/controller/dwc/pcie-designware-ep.c
> > @@ -654,7 +654,7 @@ int dw_pcie_ep_init_complete(struct dw_pcie_ep
> *ep)
> >         int i;
> >
> >         hdr_type = dw_pcie_readb_dbi(pci, PCI_HEADER_TYPE);
> > -       if (hdr_type != PCI_HEADER_TYPE_NORMAL) {
> > +       if (hdr_type & 0x7f != PCI_HEADER_TYPE_NORMAL) {
> 
> Should have () around 'hdr_type & 0x7f'.
> 
> >                 dev_err(pci->dev,
> >                         "PCIe controller is not set to EP mode
> (hdr_type:0x%x)!\n",
> >                         hdr_type);
> 
> However, shouldn't the printed value be masked too? I'd just do:
> 
> hdr_type = dw_pcie_readb_dbi(pci, PCI_HEADER_TYPE) & 0x7f;
> 
> Perhaps add a #define too. '0x7f' is used in several places.

All these are good suggestions, will make it in next version.

Thanks,
Zhiqiang
 
> 
> Rob