drm/tegra: sor: Add DisplayPort support

Add support for regular DisplayPort on Tegra210 and Tegra186.

Signed-off-by: Thierry Reding <treding@nvidia.com>

drivers/gpu/drm/tegra/dp.c

@@ -623,10 +623,10 @@ static int drm_dp_link_clock_recovery(struct drm_dp_link *link)
 			return err;
 		}
 
-		drm_dp_link_train_adjust(&link->train);
-
 		if (link->train.clock_recovered)
 			break;
+
+		drm_dp_link_train_adjust(&link->train);
 	}
 
 	return 0;
@@ -682,10 +682,10 @@ static int drm_dp_link_channel_equalization(struct drm_dp_link *link)
 			return err;
 		}
 
-		drm_dp_link_train_adjust(&link->train);
-
 		if (link->train.channel_equalized)
 			break;
+
+		drm_dp_link_train_adjust(&link->train);
 	}
 
 	return 0;
@@ -851,6 +851,8 @@ int drm_dp_link_train(struct drm_dp_link *link)
 {
 	int err;
 
+	drm_dp_link_train_init(&link->train);
+
 	if (link->caps.fast_training) {
 		if (drm_dp_link_train_valid(&link->train)) {
 			err = drm_dp_link_train_fast(link);