ScotusBlog has the details: "In Trevino v. Thaler, in
an opinion by Justice Breyer (but announced by Justice Kennedy, because
Justice Breyer was absent), the Court held by a vote of five to four
that when a state’s procedural framework, by reason of its design and
operation, makes it highly unlikely in a typical case that a defendant
will have a meaningful opportunity to raise on direct appeal a claim
that his trial counsel provided ineffective assistance, the good cause
exception recognized in Martinez v. Ryan applies."