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

[Z.q. Hou]

Hi Andrew,

Thanks a lot for your review!

Thanks,
Zhiqiang

> -----Original Message-----
> From: Andrew Murray <amurray@xxxxxxxxxxxxxxxxxxxx>
> Sent: 2020年2月21日 1:31
> To: Z.q. Hou <zhiqiang.hou@xxxxxxx>
> Cc: linux-pci@xxxxxxxxxxxxxxx; linux-arm-kernel@xxxxxxxxxxxxxxxxxxx;
> devicetree@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx;
> bhelgaas@xxxxxxxxxx; robh+dt@xxxxxxxxxx; andrew.murray@xxxxxxx;
> arnd@xxxxxxxx; mark.rutland@xxxxxxx; l.subrahmanya@xxxxxxxxxxxxxx;
> shawnguo@xxxxxxxxxx; m.karthikeyan@xxxxxxxxxxxxxx; Leo Li
> <leoyang.li@xxxxxxx>; lorenzo.pieralisi@xxxxxxx;
> catalin.marinas@xxxxxxx; will.deacon@xxxxxxx; Mingkai Hu
> <mingkai.hu@xxxxxxx>; M.h. Lian <minghuan.lian@xxxxxxx>; Xiaowei Bao
> <xiaowei.bao@xxxxxxx>
> 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@xxxxxxx>
> >
> > 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@xxxxxxx>
> 
> Reviewed-by: Andrew Murray <amurray@xxxxxxxxxxxxxxxxxxxx>
> 
> > ---
> > 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
> >