drm/radeon: fix dig encoder selection on DCE61

Was using the DCE41 code which was wrong. Fixes
blank displays on a number of Trinity systems.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org

1 files changed, 26 insertions, 5 deletions

diff --git a/drivers/gpu/drm/radeon/atombios_encoders.c b/drivers/gpu/drm/radeon/atombios_encoders.c
index 4a7f95e5550d..6e8803a1170c 100644
--- a/drivers/gpu/drm/radeon/atombios_encoders.c
+++ b/drivers/gpu/drm/radeon/atombios_encoders.c
@@ -1769,13 +1769,34 @@ static int radeon_atom_pick_dig_encoder(struct drm_encoder *encoder)
         struct radeon_crtc *radeon_crtc = to_radeon_crtc(encoder->crtc);
         struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);
         struct drm_encoder *test_encoder;
-        struct radeon_encoder_atom_dig *dig;
+        struct radeon_encoder_atom_dig *dig = radeon_encoder->enc_priv;
         uint32_t dig_enc_in_use = 0;
 
-        /* DCE4/5 */
-        if (ASIC_IS_DCE4(rdev)) {
-                dig = radeon_encoder->enc_priv;
-                if (ASIC_IS_DCE41(rdev)) {
+        if (ASIC_IS_DCE6(rdev)) {
+                /* DCE6 */
+                switch (radeon_encoder->encoder_id) {
+                case ENCODER_OBJECT_ID_INTERNAL_UNIPHY:
+                        if (dig->linkb)
+                                return 1;
+                        else
+                                return 0;
+                        break;
+                case ENCODER_OBJECT_ID_INTERNAL_UNIPHY1:
+                        if (dig->linkb)
+                                return 3;
+                        else
+                                return 2;
+                        break;
+                case ENCODER_OBJECT_ID_INTERNAL_UNIPHY2:
+                        if (dig->linkb)
+                                return 5;
+                        else
+                                return 4;
+                        break;
+                }
+        } else if (ASIC_IS_DCE4(rdev)) {
+                /* DCE4/5 */
+                if (ASIC_IS_DCE41(rdev) && !ASIC_IS_DCE61(rdev)) {
                         /* ontario follows DCE4 */
                         if (rdev->family == CHIP_PALM) {
                                 if (dig->linkb)