Suh was selected second overall in the 2010 Draft and despite his excellent production, his behaviour on the field has been called into question.
The 26-year-old called a players-only meeting ahead of the new season to discuss their discipline, according to Detroit Free Press
"I wouldn't have seen Suh doing that a couple years ago," Palmer said. "But like I said, he's coming out of his shell.
"I think that's going to be a big positive for us because we know we got him on the boat, and it's all good now."
Detroit open their season against the Minnesota Vikings on Sunday.