linux-kernel - Re: [PATCH] PCI: imx: do not remap invalid res

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Message-ID: <CAJ+vNU2Pfwz5e0Jj6c5npceOwuNTB_dTVuL4NMD2qxr0CGyeGQ@mail.gmail.com>
Date:   Wed, 1 Dec 2021 14:06:44 -0800
From:   Tim Harvey <tharvey@...eworks.com>
To:     Jingoo Han <jingoohan1@...il.com>,
        Gustavo Pimentel <gustavo.pimentel@...opsys.com>,
        Rob Herring <robh@...nel.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>, linux-pci@...r.kernel.org
Cc:     open list <linux-kernel@...r.kernel.org>,
        Richard Zhu <hongxing.zhu@....com>
Subject: Re: [PATCH] PCI: imx: do not remap invalid res

On Mon, Nov 1, 2021 at 11:03 AM Tim Harvey <tharvey@...eworks.com> wrote:
>
> On imx6 and perhaps others when pcie probes you get a:
> imx6q-pcie 33800000.pcie: invalid resource
>
> This occurs because the atu is not specified in the DT and as such it
> should not be remapped.
>
> Cc: Richard Zhu <hongxing.zhu@....com>
> Signed-off-by: Tim Harvey <tharvey@...eworks.com>
> ---
>  drivers/pci/controller/dwc/pcie-designware.c | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c
> index a945f0c0e73d..3254f60d1713 100644
> --- a/drivers/pci/controller/dwc/pcie-designware.c
> +++ b/drivers/pci/controller/dwc/pcie-designware.c
> @@ -671,10 +671,11 @@ void dw_pcie_iatu_detect(struct dw_pcie *pci)
>                 if (!pci->atu_base) {
>                         struct resource *res =
>                                 platform_get_resource_byname(pdev, IORESOURCE_MEM, "atu");
> -                       if (res)
> +                       if (res) {
>                                 pci->atu_size = resource_size(res);
> -                       pci->atu_base = devm_ioremap_resource(dev, res);
> -                       if (IS_ERR(pci->atu_base))
> +                               pci->atu_base = devm_ioremap_resource(dev, res);
> +                       }
> +                       if (!pci->atu_base || IS_ERR(pci->atu_base))
>                                 pci->atu_base = pci->dbi_base + DEFAULT_DBI_ATU_OFFSET;
>                 }
>
> --
> 2.17.1
>

ping - any feedback on this?

Best regards,

Tim