drm/gf110-/disp: magic that might help some tmds issues

The binary driver has been doing this since GF119, and we've somehow
gotten away with it.  But, TMDS that hasn't been initialised already
by the x86 vbios code is distorted without it on GM204.

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

diff --git a/drivers/gpu/drm/nouveau/core/engine/disp/nvd0.c b/drivers/gpu/drm/nouveau/core/engine/disp/nvd0.c
index 747e64b..2aae9d3 100644 (file)
--- a/drivers/gpu/drm/nouveau/core/engine/disp/nvd0.c
+++ b/drivers/gpu/drm/nouveau/core/engine/disp/nvd0.c
@@ -1063,10 +1063,18 @@ nvd0_disp_intr_unk2_2(struct nv50_disp_priv *priv, int head)
                addr = 0x612280 + (ffs(outp->info.or) - 1) * 0x800;
                data = 0x00000000;
        } else {
-               if (outp->info.type == DCB_OUTPUT_DP)
-                       nvd0_disp_intr_unk2_2_tu(priv, head, &outp->info);
                addr = 0x612300 + (ffs(outp->info.or) - 1) * 0x800;
                data = (conf & 0x0100) ? 0x00000101 : 0x00000000;
+               switch (outp->info.type) {
+               case DCB_OUTPUT_TMDS:
+                       nv_mask(priv, addr, 0x007c0000, 0x00280000);
+                       break;
+               case DCB_OUTPUT_DP:
+                       nvd0_disp_intr_unk2_2_tu(priv, head, &outp->info);
+                       break;
+               default:
+                       break;
+               }
        }
 
        nv_mask(priv, addr, 0x00000707, data);