1 files changed, 12 insertions, 0 deletions

diff --git a/drivers/gpu/drm/radeon/atombios_dp.c b/drivers/gpu/drm/radeon/atombios_dp.c
index 784ba80afcb6..0d63c4436e7c 100644
--- a/drivers/gpu/drm/radeon/atombios_dp.c
+++ b/drivers/gpu/drm/radeon/atombios_dp.c
@@ -507,6 +507,18 @@ static bool atom_dp_get_link_status(struct radeon_connector *radeon_connector,
         return true;
 }
 
+bool radeon_dp_needs_link_train(struct radeon_connector *radeon_connector)
+{
+        struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;
+        u8 link_status[DP_LINK_STATUS_SIZE];
+
+        if (!atom_dp_get_link_status(radeon_connector, link_status))
+                return false;
+        if (dp_channel_eq_ok(link_status, dig_connector->dp_lane_count))
+                return false;
+        return true;
+}
+
 static void dp_set_power(struct radeon_connector *radeon_connector, u8 power_state)
 {
         struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv;