msleep panel simple

diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
index f88a631..e129142 100644
--- a/drivers/gpu/drm/panel/panel-simple.c
+++ b/drivers/gpu/drm/panel/panel-simple.c
@@ -193,6 +193,7 @@ static int panel_simple_prepare(struct drm_panel *panel)
        struct panel_simple *p = to_panel_simple(panel);
        int err;

+       msleep(30);
        if (p->prepared)
                return 0;