Change in coreboot[master]: google/scarlet: Adjust K&D power sequence from software

[Brian Norris (Code Review)]

Brian Norris has uploaded a new patch set (#2). ( https://review.coreboot.org/25023 )

Change subject: google/scarlet: Adjust K&D power sequence from software
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google/scarlet: Adjust K&D power sequence from software

Hardware updates have suggested we need to configure the K&D panel's
power sequence in software, not in hardware. Without this change, K&D
panels will no longer power on correctly and will instead display a
black screen.

Per K&D's suggestion, we tweak these two commands. From the little HW
docs I have, this looks like it's:

(Address 0xB7, Value 0x02) -> set BC_CTRL=bit(1) (Back light control) to
                              1
(Address 0xF1, Value 0x23) -> change GPO2_SEL=bits(0:3) from
                              MIPI_TE(0001b) to BC_CTRL (0010b)

BRANCH=scarlet
BUG=b:73133861
TEST=KD display with and without HW fix on Scarlet

Change-Id: Ia076a378b10417dd9891746f9bc1086360a0f6e6
Signed-off-by: Brian Norris 
---
M src/mainboard/google/gru/mainboard.c
1 file changed, 2 insertions(+), 1 deletion(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/23/25023/2