I want to ask someone if a certain issue has ever been "brought up to discussion" or "came to discussion". Is it correct English?
Topics are brought up "in discussion". Topics currently being talked about right now are "under discussion".
So you would say, "Has this issue ever been brought up in discussion." You can also use "Came" in a slightly different meaning. While "Brought up" implies that the issue was deliberately made the focus of the discussion, "came up in discussion" suggests that the issue has been discussed simply because the subject of the conversation naturally resulted in it being talked about.