drm: add helper to sort panels to the head of the connector list

Userspace seems to like this, see

commit cb0953d734348e8862d6d7edc666cfb3bf6d8fae
Author: Adam Jackson <ajax@redhat.com>
Date:   Fri Jul 16 14:46:29 2010 -0400

    drm/i915: Initialize LVDS and eDP outputs before anything else

    This makes them sort to the front in X, which makes them likely to be
    the primary outputs if you haven't specified a preference in your DE,
    which is likely to be what you want.

    Signed-off-by: Adam Jackson <ajax@redhat.com>
    Signed-off-by: Eric Anholt <eric@anholt.net>

Sorting the connector list after the fact is much easier than trying
to be clever with the init sequence.

Acked-by: Dave Airlie <airlied@gmail.com>
Reviewed-by: Adam Jackson <ajax@redhat.com>
Acked-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 2 insertions, 0 deletions

diff --git a/include/drm/drm_crtc_helper.h b/include/drm/drm_crtc_helper.h
index e01cc80c9c30..defee28f6b95 100644
--- a/include/drm/drm_crtc_helper.h
+++ b/include/drm/drm_crtc_helper.h
@@ -137,6 +137,8 @@ extern bool drm_helper_encoder_in_use(struct drm_encoder *encoder);
 
 extern void drm_helper_connector_dpms(struct drm_connector *connector, int mode);
 
+extern void drm_helper_move_panel_connectors_to_head(struct drm_device *);
+
 extern int drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb,
                                           struct drm_mode_fb_cmd2 *mode_cmd);