Bobbi Brown is in it for the long haul -- standing firm in his belief Bobbi Kristina can pull out of her coma ... now that she's getting treatment at a facility known for its long term care.

Bobby was walking outside DeKalb Medical this week. It's touted as the best Long Term Acute Care hospital in the Atlanta area ... partly because the facility has equipment to provide continuous monitoring of vital signs -- crucial in a case like Bobbi Kristina's.

As we reported ... doctors at Emory University Hospital tested her responsiveness last week before she was transferred to DeKalb. We're told there was no change.

Sources tell us Bobby is still leaning on the power of prayer to save his daughter ... who's remained unconscious since Feb 1.

Read more: http://www.tmz.com/2015/03/27/bobby-brown-bobbi-kristina-hospital-photodekalb-medical/#ixzz3VcSkWY36