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

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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>
This commit is contained in:
Brian Norris 2018-03-07 13:11:47 -08:00 • committed by Patrick Georgi
commit cc761e84af
1 changed files with 2 additions and 1 deletions
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3
src/mainboard/google/gru/mainboard.c
View file

@ -493,6 +493,7 @@ static struct panel_init_command kd097d04_init_commands[] = {
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 @@ static struct panel_init_command kd097d04_init_commands[] = {
/* 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),