drm/nouveau/pci/msi: disable MSI on big-endian platforms by default

BugLink: http://bugs.launchpad.net/bugs/1716284
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>
Signed-off-by: Seth Forshee <seth.forshee@canonical.com>

diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/pci/base.c b/drivers/gpu/drm/nouveau/nvkm/subdev/pci/base.c
index eb9b278198b229672df91bf6426432ee7d6f9f65..a4cb82495cee3e1d4910cdb295bcd25509baa8a1 100644 (file)
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/pci/base.c
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/pci/base.c
@@ -192,6 +192,10 @@ nvkm_pci_new_(const struct nvkm_pci_func *func, struct nvkm_device *device,
                }
        }
 
+#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;