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 0x22) -> 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 <briannorris@chromium.org>
Reviewed-on: https://review.coreboot.org/25023
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-by: Matthias Kaehlcke <mka@chromium.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
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),