On Tue, Aug 16, 2016 at 03:06:54PM +0300, Andy Shevchenko wrote:

Serial console is broken in v4.8-rcX. Mika and I independently bisected down to
commit 4ef03d328769 ("tty/serial/8250: use mctrl_gpio helpers").

Since neither author nor anyone else didn't propose a solution we better revert
it for now.

This reverts commit 4ef03d328769eddbfeca1f1c958fdb181a69c341.

Cc: Mika Westerberg <mika.westerberg@linux.intel.com>

Works for me. This solves the issue I've seen on Broxton machines.

Tested-by: Mika Westerberg <mika.westerberg@linux.intel.com>