drm/crtc: add interface to reinitialise the legacy mode group

This can be called to update things after dynamic connectors/encoders
are created/deleted.

Reviewed-by: Todd Previte <tprevite@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index 7db6251c38e7..f939b058953c 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -1513,6 +1513,15 @@ int drm_mode_group_init_legacy_group(struct drm_device *dev,
 }
 EXPORT_SYMBOL(drm_mode_group_init_legacy_group);
 
+void drm_reinit_primary_mode_group(struct drm_device *dev)
+{
+        drm_modeset_lock_all(dev);
+        drm_mode_group_destroy(&dev->primary->mode_group);
+        drm_mode_group_init_legacy_group(dev, &dev->primary->mode_group);
+        drm_modeset_unlock_all(dev);
+}
+EXPORT_SYMBOL(drm_reinit_primary_mode_group);
+
 /**
  * drm_crtc_convert_to_umode - convert a drm_display_mode into a modeinfo
  * @out: drm_mode_modeinfo struct to return to the user