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author | Brian Norris <briannorris@chromium.org> | 2018-03-07 13:11:47 -0800 |
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committer | Patrick Georgi <pgeorgi@google.com> | 2018-03-08 18:02:34 +0000 |
commit | cc761e84af6b94795a7eae8ed476e93b687d47d2 (patch) | |
tree | 707adfc94f932eb6279e7196a1ab674454a21cbb /src/mainboard/google/poppy/ramstage.c | |
parent | dc5d24c83702fb7367761eb31110548e51d8bb92 (diff) |
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/google/poppy/ramstage.c')
0 files changed, 0 insertions, 0 deletions