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SubjectRe: [PATCH] PCI: altera: Retrain link in rootport mode only
On Mon, Aug 15, 2016 at 04:36:19PM +0800, Ley Foon Tan wrote:
> Altera PCIe IP can be configured as rootport or device and they might have
> same vendor ID. It will cause the system hang issue if Altera PCIe is in
> endpoint mode and work with other PCIe rootport that from other vendors.
> So, add the rootport mode checking in link retrain fixup function.
>
> Signed-off-by: Ley Foon Tan <lftan@altera.com>
> ---
> drivers/pci/host/pcie-altera.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/drivers/pci/host/pcie-altera.c b/drivers/pci/host/pcie-altera.c
> index 58eef99..6477738 100644
> --- a/drivers/pci/host/pcie-altera.c
> +++ b/drivers/pci/host/pcie-altera.c
> @@ -139,6 +139,9 @@ static void altera_pcie_retrain(struct pci_dev *dev)
> u16 linkcap, linkstat;
> struct altera_pcie *pcie = dev->bus->sysdata;
>
> + if (!pci_is_root_bus(dev->bus))
> + return;

It seems like it would be more direct to check for
"pci_pcie_type(dev) != PCI_EXP_TYPE_ROOT_PORT"?

> if (!altera_pcie_link_is_up(pcie))
> return;
>
> --
> 1.8.2.1
>

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