How to scroll a page to top/home

I may use lv_page_scroll_ver to scroll a page down many places.Once I clear the page, the scroll is still in some place down of the page, and at the time I dont know how many times the lv_page_scroll_ver is called. so, is there a function to scroll to the top of the page when you dont know what the height you have scrolled down?
Thank you very much!

Refer to this and do the reverse i.e. use a positive number

This works for me:

/* set table line 0 active */
lv_obj_t
	*page = lv_obj_get_parent (lv_obj_get_parent (table)),
	*scrl = lv_page_get_scrollable (page);
lv_obj_set_pos (scrl, 0, 0);