drm/amd/display: Do not skip FBC init in failsafe mode

Initially FBC would be initialized if display's edid was correct
and all the modes acquired from it, but n case when edid is corrupted
or non-existant we must still initialize FBC.
Signed-off-by: Mikita Lipski <mikita.lipski@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c

@@ -3425,12 +3425,12 @@ static int amdgpu_dm_connector_get_modes(struct drm_connector *connector)
 
 	encoder = helper->best_encoder(connector);
 
-	if (!edid || !drm_edid_is_valid(edid))
-		return drm_add_modes_noedid(connector, 640, 480);
-
-	amdgpu_dm_connector_ddc_get_modes(connector, edid);
-	amdgpu_dm_connector_add_common_modes(encoder, connector);
-
+	if (!edid || !drm_edid_is_valid(edid)) {
+		drm_add_modes_noedid(connector, 640, 480);
+	} else {
+		amdgpu_dm_connector_ddc_get_modes(connector, edid);
+		amdgpu_dm_connector_add_common_modes(encoder, connector);
+	}
 	amdgpu_dm_fbc_init(connector);
 
 	return amdgpu_dm_connector->num_modes;