Merge pull request #216 from ardje/kwaak-dp

Fallback to a "sane" speed

Author: mdrjr

drivers/gpu/drm/exynos/exynos_dp_core.c

@@ -671,9 +671,14 @@ static void exynos_dp_init_training(struct exynos_dp_device *dp,
 
 	if ((dp->link_train.link_rate != LINK_RATE_1_62GBPS) &&
 	   (dp->link_train.link_rate != LINK_RATE_2_70GBPS)) {
-		dev_err(dp->dev, "Rx Max Link Rate is abnormal :%x !\n",
-			dp->link_train.link_rate);
-		dp->link_train.link_rate = LINK_RATE_1_62GBPS;
+		if (dp->link_train.link_rate == LINK_RATE_5_40GBPS) {
+			dev_err(dp->dev, "Rx Max Link Rate 5.4GBPS is too high, fallback to 2.7GBPS!\n");
+			dp->link_train.link_rate = LINK_RATE_2_70GBPS;
+		} else {
+			dev_err(dp->dev, "Rx Max Link Rate is abnormal :%x !\n",
+				dp->link_train.link_rate);
+			dp->link_train.link_rate = LINK_RATE_1_62GBPS;
+		}
 	}
 
 	if (dp->link_train.lane_count == 0) {

drivers/gpu/drm/exynos/exynos_dp_core.h

@@ -23,7 +23,8 @@
 
 enum link_rate_type {
 	LINK_RATE_1_62GBPS = 0x06,
-	LINK_RATE_2_70GBPS = 0x0a
+	LINK_RATE_2_70GBPS = 0x0a,
+	LINK_RATE_5_40GBPS = 0x14
 };
 
 enum link_lane_count_type {