diff options
| author | Brian Norris <briannorris@chromium.org> | 2018-03-07 13:11:47 -0800 |
|---|---|---|
| committer | Patrick Georgi <pgeorgi@google.com> | 2018-03-08 18:02:34 +0000 |
| commit | cc761e84af6b94795a7eae8ed476e93b687d47d2 (patch) | |
| tree | 707adfc94f932eb6279e7196a1ab674454a21cbb /src/mainboard | |
| parent | dc5d24c83702fb7367761eb31110548e51d8bb92 (diff) | |
| download | coreboot-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.c | 3 |
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), |