Patch merged into coreboot/master: 8c440a6 tegra124: add support for full DP link training

the following patch was just integrated into master:
commit 8c440a6befb735a4c1c553f5ff2e4539ec50e490
Author: Neil Chen 
Date:   Tue Sep 23 17:41:59 2014 +0800

tegra124: add support for full DP link training

The original dp driver supports only fast link training and a
    special drive setting is used for the link training sequence.
    This might not be accepted by all panels. The better way is to
    go through full link training sequence to negotiate for a best
    drive setting.

With the change, dp driver will try fast link training first,
    this is same as before. If it fails in fast link training, will
    try full link training.

BUG=chrome-os-partner:32129
    TEST=all panels on blaze/big devices work fine.

Original-Change-Id: I6f3402c4c5993a156c965c7f52b011d336a2946f
    Original-Signed-off-by: Neil Chen 
    Original-Reviewed-on: https://chromium-review.googlesource.com/219543
    Original-Reviewed-by: Jimmy Zhang 
    Original-Reviewed-by: Julius Werner

(cherry picked from commit 24966517d41252384af3c2784def36aebad42434)
    Signed-off-by: Aaron Durbin

Change-Id: I3e7e7e749e5c8a9f07ac6132859fcad6fc96c39c
    Reviewed-on: http://review.coreboot.org/9247
    Reviewed-by: Paul Menzel 
    Tested-by: build bot (Jenkins)
    Reviewed-by: David Hendricks

See http://review.coreboot.org/9247 for details.

-gerrit