Patch merged into coreboot/master: ac4fef8 tegra124: use known-good drive for fast-train only

the following patch was just integrated into master:
commit ac4fef83454243d75571bac627a8ec15d3fcd405
Author: Neil Chen 
Date:   Wed Sep 24 10:41:08 2014 +0800

tegra124: use known-good drive for fast-train only

A higher drive setting is used for fast link training, once the
    link training succeeds, a known-good drive setting will be used
    for the main stream transactions.
    For full link training sequence, the sink devices may ask for a
    preferred drive setting, thus this drive setting should be used
    for the main stream transactions too.

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

Original-Change-Id: Icc540650dc1329af07fd9ee4661eb7fad435fde4
    Original-Signed-off-by: Neil Chen 
    Original-Reviewed-on: https://chromium-review.googlesource.com/219544
    Original-Reviewed-by: Julius Werner

(cherry picked from commit 13d6accfdbe678e785851057f0800a3bbef11bea)
    Signed-off-by: Aaron Durbin

Change-Id: If2fe7d5621f15aa3134d2a3920220e149bb64be6
    Reviewed-on: http://review.coreboot.org/9248
    Tested-by: build bot (Jenkins)
    Reviewed-by: Marc Jones

See http://review.coreboot.org/9248 for details.

-gerrit