drm/tilcdc: panel: Add atomic modeset helpers to connector funcs

Add atomic modeset helpers to panel connector funcs. Property handling
related helpers, atomic reset helper, and new dpms helper is needed in
connector for atomic modeseting to work. The default helper functions
are enough.

Signed-off-by: Jyri Sarha <jsarha@ti.com>

drivers/gpu/drm/tilcdc/tilcdc_panel.c

@@ -22,6 +22,7 @@
 #include <video/display_timing.h>
 #include <video/of_display_timing.h>
 #include <video/videomode.h>
+#include <drm/drm_atomic_helper.h>
 
 #include "tilcdc_drv.h"
 
@@ -194,9 +195,12 @@ static struct drm_encoder *panel_connector_best_encoder(
 
 static const struct drm_connector_funcs panel_connector_funcs = {
 	.destroy            = panel_connector_destroy,
-	.dpms               = drm_helper_connector_dpms,
+	.dpms               = drm_atomic_helper_connector_dpms,
 	.detect             = panel_connector_detect,
 	.fill_modes         = drm_helper_probe_single_connector_modes,
+	.reset              = drm_atomic_helper_connector_reset,
+	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
+	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 };
 
 static const struct drm_connector_helper_funcs panel_connector_helper_funcs = {