[ Upstream commit 1323e0c6e1d7e103d59384c3ac50f72b17a6936c ] According to datasheet, the command opcode must be specified into bits [14:12] of the Extended Port Control register (EPC). Fixes: de776d0d316f ("net: dsa: mv88e6xxx: add support for mv88e6393x family") Signed-off-by: Marco Migliore <m.migliore@tiesse.com> Reviewed-by: Andrew Lunn <andrew@lunn.ch> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Sasha Levin <sashal@kernel.org>