diff --git a/drivers/gpu/drm/radeon/r600_audio.c b/drivers/gpu/drm/radeon/r600_audio.c
index baf222faf158..dddb9e5e0c61 100644
--- a/drivers/gpu/drm/radeon/r600_audio.c
+++ b/drivers/gpu/drm/radeon/r600_audio.c
@@ -181,41 +181,6 @@ int r600_audio_init(struct radeon_device *rdev)
 	return 0;
 }
 
-/*
- * determin how the encoders and audio interface is wired together
- */
-int r600_audio_tmds_index(struct drm_encoder *encoder)
-{
-	struct drm_device *dev = encoder->dev;
-	struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);
-	struct drm_encoder *other;
-
-	switch (radeon_encoder->encoder_id) {
-	case ENCODER_OBJECT_ID_INTERNAL_KLDSCP_TMDS1:
-	case ENCODER_OBJECT_ID_INTERNAL_UNIPHY:
-	case ENCODER_OBJECT_ID_INTERNAL_UNIPHY1:
-		return 0;
-
-	case ENCODER_OBJECT_ID_INTERNAL_LVTM1:
-		/* special case check if an TMDS1 is present */
-		list_for_each_entry(other, &dev->mode_config.encoder_list, head) {
-			if (to_radeon_encoder(other)->encoder_id ==
-				ENCODER_OBJECT_ID_INTERNAL_TMDS1)
-				return 1;
-		}
-		return 0;
-
-	case ENCODER_OBJECT_ID_INTERNAL_UNIPHY2:
-	case ENCODER_OBJECT_ID_INTERNAL_KLDSCP_LVTMA:
-		return 1;
-
-	default:
-		DRM_ERROR("Unsupported encoder type 0x%02X\n",
-			  radeon_encoder->encoder_id);
-		return -1;
-	}
-}
-
 /*
  * atach the audio codec to the clock source of the encoder
  */