drm/nouveau: Fix TMDS on some DCB1.5 boards.

The TMDS output of an nv11 was being detected as LVDS, because it uses
DCB type 2 for TMDS instead of type 4.

Reported-by: Bertrand VIEILLE <Vieille.Bertrand@free.fr>
Signed-off-by: Francisco Jerez <currojerez@riseup.net>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

1 files changed, 6 insertions, 14 deletions

diff --git a/drivers/gpu/drm/nouveau/nouveau_bios.c b/drivers/gpu/drm/nouveau/nouveau_bios.c
index f6c615b228d4..974b0f8ae048 100644
--- a/drivers/gpu/drm/nouveau/nouveau_bios.c
+++ b/drivers/gpu/drm/nouveau/nouveau_bios.c
@@ -6166,22 +6166,14 @@ parse_dcb15_entry(struct drm_device *dev, struct dcb_table *dcb,
                 entry->type = OUTPUT_TV;
                 break;
         case 2:
-        case 3:
-                entry->type = OUTPUT_LVDS;
-                break;
         case 4:
-                switch ((conn & 0x000000f0) >> 4) {
-                case 0:
-                        entry->type = OUTPUT_TMDS;
-                        break;
-                case 1:
+                if (conn & 0x10)
                         entry->type = OUTPUT_LVDS;
-                        break;
-                default:
-                        NV_ERROR(dev, "Unknown DCB subtype 4/%d\n",
-                                 (conn & 0x000000f0) >> 4);
-                        return false;
-                }
+                else
+                        entry->type = OUTPUT_TMDS;
+                break;
+        case 3:
+                entry->type = OUTPUT_LVDS;
                 break;
         default:
                 NV_ERROR(dev, "Unknown DCB type %d\n", conn & 0x0000000f);