Change in coreboot[master]: nb/intel/gm45: Set display backlight according to EDID string

[Arthur Heymans (Code Review)]

Hello Patrick Rudolph, build bot (Jenkins),

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

https://review.coreboot.org/19500

to look at the new patch set (#14).

Change subject: nb/intel/gm45: Set display backlight according to EDID string
......................................................................

nb/intel/gm45: Set display backlight according to EDID string

Add some known good values for some thinkpads displays.

Known good means that at this pwm frequency the display is evenly lit
on all duty cycles, the display makes minimal to no noise at lower
duty cycles and the display does not flicker. This values differs from
vendor (which uses an obviously wrong display clock  (190MHz instead
of 320MHz) resulting in frequency more than 60% off the intended
value.

Change-Id: Id7bc0d453fac31e806852206ba2c895720b2c843
Signed-off-by: Arthur Heymans 
---
M src/mainboard/lenovo/t400/Makefile.inc
A src/mainboard/lenovo/t400/blc.c
M src/mainboard/lenovo/x200/Makefile.inc
A src/mainboard/lenovo/x200/blc.c
M src/mainboard/roda/rk9/Makefile.inc
A src/mainboard/roda/rk9/blc.c
M src/northbridge/intel/gm45/chip.h
M src/northbridge/intel/gm45/gm45.h
M src/northbridge/intel/gm45/gma.c
9 files changed, 144 insertions(+), 7 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/00/19500/14