drm/kms/i915: Add the default mode for CRT output without EDID

Add the default mode for every output device when there
is no mode for it.

Signed-off-by: Zhao Yakui <yakui.zhao@intel.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 5 insertions, 2 deletions

diff --git a/drivers/gpu/drm/drm_crtc_helper.c b/drivers/gpu/drm/drm_crtc_helper.c
index e7e6c25b560c..6f4b4446fcdf 100644
--- a/drivers/gpu/drm/drm_crtc_helper.c
+++ b/drivers/gpu/drm/drm_crtc_helper.c
@@ -109,8 +109,11 @@ int drm_helper_probe_single_connector_modes(struct drm_connector *connector,
         }
 
         count = (*connector_funcs->get_modes)(connector);
-        if (!count)
-                return 0;
+        if (!count) {
+                count = drm_add_modes_noedid(connector, 800, 600);
+                if (!count)
+                        return 0;
+        }
 
         drm_mode_connector_list_update(connector);