On Wed, Jul 17, 2019 at 9:09 PM Frederick Lawler <fred@xxxxxxxxxxxx> wrote:
>
> Commit 8c0d3a02c130 ("PCI: Add accessors for PCI Express Capability")
> added accessors for the PCI Express Capability so that drivers didn't
> need to be aware of differences between v1 and v2 of the PCI
> Express Capability.
>
> Replace pci_read_config_word() and pci_write_config_word() calls with
> pcie_capability_read_word() and pcie_capability_write_word().
>
> Signed-off-by: Frederick Lawler <fred@xxxxxxxxxxxx>
> ---
> drivers/block/mtip32xx/mtip32xx.c | 28 ++++++++++++----------------
> 1 file changed, 12 insertions(+), 16 deletions(-)
>
> diff --git a/drivers/block/mtip32xx/mtip32xx.c b/drivers/block/mtip32xx/mtip32xx.c
> index f0105d118056..b7b26e33248b 100644
> --- a/drivers/block/mtip32xx/mtip32xx.c
> +++ b/drivers/block/mtip32xx/mtip32xx.c
> @@ -3952,22 +3952,18 @@ static void mtip_disable_link_opts(struct driver_data *dd, struct pci_dev *pdev)
> int pos;
> unsigned short pcie_dev_ctrl;
>
> - pos = pci_find_capability(pdev, PCI_CAP_ID_EXP);
> - if (pos) {
> - pci_read_config_word(pdev,
> - pos + PCI_EXP_DEVCTL,
> - &pcie_dev_ctrl);
> - if (pcie_dev_ctrl & (1 << 11) ||
> - pcie_dev_ctrl & (1 << 4)) {
> - dev_info(&dd->pdev->dev,
> - "Disabling ERO/No-Snoop on bridge device %04x:%04x\n",
> - pdev->vendor, pdev->device);
> - pcie_dev_ctrl &= ~(PCI_EXP_DEVCTL_NOSNOOP_EN |
> - PCI_EXP_DEVCTL_RELAX_EN);
> - pci_write_config_word(pdev,
> - pos + PCI_EXP_DEVCTL,
> - pcie_dev_ctrl);
> - }
> + if (!pci_is_pcie(pdev))
> + return;
> +
> + pcie_capability_read_word(pdev, PCI_EXP_DEVCTL, &pcie_dev_ctrl);
> + if (pcie_dev_ctrl & (1 << 11) ||
> + pcie_dev_ctrl & (1 << 4)) {
Hmm, sort of sloppy that d1e714db8129 ("mtip32xx: Fix ERO and NoSnoop
values in PCIe upstream on AMD systems") used
PCI_EXP_DEVCTL_NOSNOOP_EN and PCI_EXP_DEVCTL_RELAX_EN below, but not
here. Could be fixed with a separate follow-on patch.
> + dev_info(&dd->pdev->dev,
> + "Disabling ERO/No-Snoop on bridge device %04x:%04x\n",
> + pdev->vendor, pdev->device);
> + pcie_dev_ctrl &= ~(PCI_EXP_DEVCTL_NOSNOOP_EN |
> + PCI_EXP_DEVCTL_RELAX_EN);
> + pcie_capability_write_word(pdev, PCI_EXP_DEVCTL, pcie_dev_ctrl);
> }
> }
>
> --
> 2.17.1
>
