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authorBrian Norris <briannorris@chromium.org>2018-03-07 13:11:47 -0800
committerPatrick Georgi <pgeorgi@google.com>2018-03-08 18:02:34 +0000
commitcc761e84af6b94795a7eae8ed476e93b687d47d2 (patch)
tree707adfc94f932eb6279e7196a1ab674454a21cbb /src/mainboard
parentdc5d24c83702fb7367761eb31110548e51d8bb92 (diff)
downloadcoreboot-cc761e84af6b94795a7eae8ed476e93b687d47d2.tar.xz
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>
Diffstat (limited to 'src/mainboard')
-rw-r--r--src/mainboard/google/gru/mainboard.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/mainboard/google/gru/mainboard.c b/src/mainboard/google/gru/mainboard.c
index 7cd9acd589..c9f3c4891f 100644
--- a/src/mainboard/google/gru/mainboard.c
+++ b/src/mainboard/google/gru/mainboard.c
@@ -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),