drm/nouveau/mxm: pretend to succeed, even if we can't shadow the MXM-SIS

There's at least one known case where our shadowing code is buggy, and we
fail init.  Until we can be confident we're doing all this correctly, lets
succeed and risk crazy bios tables rather than failing for perfectly valid
configs too.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

diff --git a/drivers/gpu/drm/nouveau/nouveau_mxm.c b/drivers/gpu/drm/nouveau/nouveau_mxm.c
index 8bccddf4eff0011e9ad2e330b0ae8163270c2470..e5a64f0f4cb74538f41e121d19b459395be4ce05 100644 (file)
--- a/drivers/gpu/drm/nouveau/nouveau_mxm.c
+++ b/drivers/gpu/drm/nouveau/nouveau_mxm.c
@@ -656,7 +656,16 @@ nouveau_mxm_init(struct drm_device *dev)
 
        if (mxm_shadow(dev, mxm[0])) {
                MXM_MSG(dev, "failed to locate valid SIS\n");
+#if 0
+               /* we should, perhaps, fall back to some kind of limited
+                * mode here if the x86 vbios hasn't already done the
+                * work for us (so we prevent loading with completely
+                * whacked vbios tables).
+                */
                return -EINVAL;
+#else
+               return 0;
+#endif
        }
 
        MXM_MSG(dev, "MXMS Version %d.%d\n",