1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/gpu/drm/radeon/atombios_dp.c b/drivers/gpu/drm/radeon/atombios_dp.c
index 11ba9d21b89b..db42a670f995 100644
--- a/drivers/gpu/drm/radeon/atombios_dp.c
+++ b/drivers/gpu/drm/radeon/atombios_dp.c
@@ -492,6 +492,10 @@ int radeon_dp_mode_valid_helper(struct drm_connector *connector,
         struct radeon_connector_atom_dig *dig_connector;
         int dp_clock;
 
+        if ((mode->clock > 340000) &&
+            (!radeon_connector_is_dp12_capable(connector)))
+                return MODE_CLOCK_HIGH;
+
         if (!radeon_connector->con_priv)
                 return MODE_CLOCK_HIGH;
         dig_connector = radeon_connector->con_priv;