rambi: Fix eDP panel functionality

For some mysterious reason GPIO_S0_NC22 is making the eDP panel
go entirely white when it is configured with internal pullup.
Since these (supposedly XDP related) pins are unknown functionality
lets set them to GPIO_DEFAULT instead of GPIO_NC.

Additionally the VBIOS is being changed to issue int15 callback
to determine the boot graphics device.  If we list both LFP and EFP
then the dev/rec screens will show on the panel when HDMI is not
attached and otherwise will display on HDMI.

BUG=chrome-os-partner:23507
BRANCH=rambi
TEST=build and boot on rambi, see firmware/kernel screens on the panel
when HDMI is not attached, and firmware screens on the panel and
kernel screens on both when HDMI is attached.

Change-Id: Ieb05a591d63c4f8e09fa154eeb76004d32579508
Signed-off-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/175952
Reviewed-by: Shawn Nematbakhsh <shawnn@chromium.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/4944
Tested-by: build bot (Jenkins)
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>

0 files changed, 0 insertions, 0 deletions