Change in coreboot[master]: nb/intel/haswell/gma: Support boards that have DDI E connected

[Tristan Corrick (Code Review)]

Hello build bot (Jenkins), Nico Huber,

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/29385

to look at the new patch set (#3).

Change subject: nb/intel/haswell/gma: Support boards that have DDI E connected
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nb/intel/haswell/gma: Support boards that have DDI E connected

On an ASRock H81M-HDS neither libgfxinit, nor Linux, is able to
initialise the display when lanes are not configured to be shared
between DDI A and DDI E.

Intel's reference manual [1] states that the decision to share lanes
between DDI A and DDI E is "based on board configuration". Hence, add a
new field to the devicetree that boards can set. All existing Haswell
boards have this unset, thus taking a value of 0, so there is no change
to existing behaviour.

[1]: Intel Open Source Graphics Programmer's Reference Manual (PRM)
     Volume 2c: Command Reference: Registers (Haswell)
     https://01.org/linuxgraphics/documentation/hardware-specification-prms/2013-...

Change-Id: I6f7832293215d2b53e31b0a5c985e6098eb72f1b
Signed-off-by: Tristan Corrick 
---
M src/northbridge/intel/haswell/chip.h
M src/northbridge/intel/haswell/gma.c
2 files changed, 6 insertions(+), 1 deletion(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/85/29385/3