drm/radeon/kms: make sure eDP panel is on for modesetting

Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 7 insertions, 1 deletions

diff --git a/drivers/gpu/drm/radeon/radeon_encoders.c b/drivers/gpu/drm/radeon/radeon_encoders.c
index cdac73975f6e..fd0087faf758 100644
--- a/drivers/gpu/drm/radeon/radeon_encoders.c
+++ b/drivers/gpu/drm/radeon/radeon_encoders.c
@@ -1936,11 +1936,17 @@ static void radeon_atom_encoder_prepare(struct drm_encoder *encoder)
         radeon_atom_output_lock(encoder, true);
         radeon_atom_encoder_dpms(encoder, DRM_MODE_DPMS_OFF);
 
-        /* select the clock/data port if it uses a router */
         if (connector) {
                 struct radeon_connector *radeon_connector = to_radeon_connector(connector);
+
+                /* select the clock/data port if it uses a router */
                 if (radeon_connector->router.cd_valid)
                         radeon_router_select_cd_port(radeon_connector);
+
+                /* turn eDP panel on for mode set */
+                if (connector->connector_type == DRM_MODE_CONNECTOR_eDP)
+                        atombios_set_edp_panel_power(connector,
+                                                     ATOM_TRANSMITTER_ACTION_POWER_ON);
         }
 
         /* this is needed for the pll/ss setup to work correctly in some cases */