tree 9464b44d722b963b6c1f6bdc85299218219d6a8c
parent b75fb0acda99e804b5049ff75f3a51454fb7ba2c
author Wenkai Du <wenkai.du@intel.com> 1417816826 -0800
committer Stefan Reinauer <stefan.reinauer@coreboot.org> 1428689396 +0200

broadwell: Fix PCIe ports programming sequences to enable HSIOPC

HSIOPC/GPIO71 is used to control power to VCCHSIO, VCCUSB3PLL and
VCCSATA3PLL in S0. PCH will drive HSIOPC low when all the high
speed I/O controllers (xHCI, SATA, GbE and PCIe) are idle.

This patch added a few additional PCIe programming steps as required
in 535127 BIOS Writer Guide Rev 2.3.0 to enable this power saving mode.

BUG=none
BRANCH=none
TEST=tested on Paine watching GPIO71 toggling as expected

Change-Id: Ica6954c125ec3129e2659168f1f23dc861ce5708
Signed-off-by: Stefan Reinauer <reinauer@chromium.org>
Original-Commit-Id: e38f9ef57c480ca5ee420020eb80a1adb3c381d3
Original-Change-Id: I88ef125c681c8631e8b887f7ccf017b90b8c0f10
Original-Signed-off-by: Wenkai Du <wenkai.du@intel.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/238580
Original-Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-on: http://review.coreboot.org/9482
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>