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

[Brian Norris (Code Review)]

Brian Norris has uploaded this change for review. ( 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/23/25023/1

diff --git a/src/mainboard/google/gru/mainboard.c b/src/mainboard/google/gru/mainboard.c
index 7cd9acd..c9f3c48 100644
--- a/src/mainboard/google/gru/mainboard.c
+++ b/src/mainboard/google/gru/mainboard.c
@@ -493,6 +493,7 @@
    MIPI_INIT_CMD(0xB4, 0x00),
    MIPI_INIT_CMD(0xB6, 0x80),
    /* VCOM disable */
+	MIPI_INIT_CMD(0xB7, 0x02),
    MIPI_INIT_CMD(0xB8, 0x80),
    MIPI_INIT_CMD(0xBA, 0x43),
    /* VCOM setting */
@@ -506,7 +507,7 @@
    /* VGL setting */
    MIPI_INIT_CMD(0xBF, 0x1A),
    MIPI_INIT_CMD(0xF0, 0x39),
-	MIPI_INIT_CMD(0xF1, 0x21),
+	MIPI_INIT_CMD(0xF1, 0x22),
    /* Gamma setting */
    MIPI_INIT_CMD(0xB0, 0x02),
    MIPI_INIT_CMD(0xC0, 0x00),