linux-kernel - Re: [PATCH] drm/amdgpu: Prefer pcie_capability_read

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Date:   Thu, 18 Jul 2019 07:58:52 -0500
From:   Bjorn Helgaas <bhelgaas@...gle.com>
To:     Frederick Lawler <fred@...dlawl.com>
Cc:     David Airlie <airlied@...ux.ie>, daniel@...ll.ch,
        amd-gfx@...ts.freedesktop.org,
        DRI mailing list <dri-devel@...ts.freedesktop.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/amdgpu: Prefer pcie_capability_read_word()

On Wed, Jul 17, 2019 at 9:08 PM Frederick Lawler <fred@...dlawl.com> 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@...dlawl.com>

> -                               pci_read_config_word(adev->pdev, gpu_pos + PCI_EXP_LNKCTL2, &tmp16);
> +                               pcie_capability_read_word(adev->pdev,
> +                                                         PCI_EXP_LNKCTL2,
> +                                                         &tmp16);
>                                 tmp16 &= ~((1 << 4) | (7 << 9));
>                                 tmp16 |= (gpu_cfg2 & ((1 << 4) | (7 << 9)));

Same comments as for radeon.  Looks like a lot of similar code between
radeon and amdgpu.