IMX6/7 failed to boot due to PCIE changes

[Aisheng Dong]

+ Richard.

> From: Aisheng Dong
> Sent: Monday, September 21, 2020 11:00 AM
> 
> > From: Jingoo Han <jingoohan1 at gmail.com>
> > Sent: Sunday, September 20, 2020 2:58 AM On 9/17/20, 6:53 AM, Aisheng
> > Dong wrote:
> > > Hi Rob,
> > >
> > > We found many MX6/7 boards board failed to boot with latest
> > > linux-next
> > kernel recently.
> > > By doing bisect, the issue seems to be related with below two PCIE changes.
> > > c2b0c098fbd1 PCI: dwc: Use generic config accessors
> > > 7975c8cc8ed8 PCI: dwc: Remove dwc specific config accessor ops
> >
> > Dear Dong,
> >
> > Recently, Rob shared the following patch. Would you apply and test it?
> > I think that it will fix your issue.
> 
> Yes, it works.
> May I know where is Rob's patch?
> I'd like to provide a test-by.
> 
> Regards
> Aisheng
> 
> >
> > diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c
> > b/drivers/pci/controller/dwc/pcie-designware-host.c
> > index 317ff512f8df..afee1a0e8883 100644
> > --- a/drivers/pci/controller/dwc/pcie-designware-host.c
> > +++ b/drivers/pci/controller/dwc/pcie-designware-host.c
> > @@ -441,6 +441,9 @@ static void __iomem
> > *dw_pcie_other_conf_map_bus(struct pci_bus *bus,
> >         struct pcie_port *pp = bus->sysdata;
> >         struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
> >
> > +       if (!dw_pcie_link_up(pci))
> > +               return NULL;
> > +
> >         busdev = PCIE_ATU_BUS(bus->number) |
> > PCIE_ATU_DEV(PCI_SLOT(devfn)) |
> >                  PCIE_ATU_FUNC(PCI_FUNC(devfn));
> >
> > [.....]
> >
> > Thank you.
> >
> > Best regards,
> > Jingoo Han