drm/radeon/kms: use hardcoded dig encoder to transmitter mapping for DCE4.1

The encoders are supposedly fully routeable, but changing the mapping
doesn't always seem to take.  Using a hardcoded mapping is much more
reliable.

Fixes:
https://bugs.freedesktop.org/show_bug.cgi?id=41366

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Tested-by: Simon Farnsworth <simon.farnsworth@onelan.co.uk>
Cc: stable@kernel.org
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 6 insertions, 3 deletions

diff --git a/drivers/gpu/drm/radeon/radeon_encoders.c b/drivers/gpu/drm/radeon/radeon_encoders.c
index 13690f3eb4a4..8a171b21b453 100644
--- a/drivers/gpu/drm/radeon/radeon_encoders.c
+++ b/drivers/gpu/drm/radeon/radeon_encoders.c
@@ -1755,9 +1755,12 @@ static int radeon_atom_pick_dig_encoder(struct drm_encoder *encoder)
         /* DCE4/5 */
         if (ASIC_IS_DCE4(rdev)) {
                 dig = radeon_encoder->enc_priv;
-                if (ASIC_IS_DCE41(rdev))
-                        return radeon_crtc->crtc_id;
-                else {
+                if (ASIC_IS_DCE41(rdev)) {
+                        if (dig->linkb)
+                                return 1;
+                        else
+                                return 0;
+                } else {
                         switch (radeon_encoder->encoder_id) {
                         case ENCODER_OBJECT_ID_INTERNAL_UNIPHY:
                                 if (dig->linkb)