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    Subject[PATCH 4.4 16/31] drm/nouveau/pci/msi: disable MSI on big-endian platforms by default
    Date
    4.4-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Ilia Mirkin <imirkin@alum.mit.edu>

    commit bc60c90f472b6e762ea96ef384072145adc8d4af upstream.

    It appears that MSI does not work on either G5 PPC nor on a E5500-based
    platform, where other hardware is reported to work fine with MSI.

    Both tests were conducted with NV4x hardware, so perhaps other (or even
    this) hardware can be made to work. It's still possible to force-enable
    with config=NvMSI=1 on load.

    Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
    Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    drivers/gpu/drm/nouveau/nvkm/subdev/pci/base.c | 4 ++++
    1 file changed, 4 insertions(+)

    --- a/drivers/gpu/drm/nouveau/nvkm/subdev/pci/base.c
    +++ b/drivers/gpu/drm/nouveau/nvkm/subdev/pci/base.c
    @@ -180,6 +180,10 @@ nvkm_pci_new_(const struct nvkm_pci_func
    }
    }

    +#ifdef __BIG_ENDIAN
    + pci->msi = false;
    +#endif
    +
    pci->msi = nvkm_boolopt(device->cfgopt, "NvMSI", pci->msi);
    if (pci->msi && func->msi_rearm) {
    pci->msi = pci_enable_msi(pci->pdev) == 0;

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