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| author | Devin Lu <Devin.Lu@quantatw.com> | 2021-06-18 16:13:49 +0800 |
|---|---|---|
| committer | Commit Bot <commit-bot@chromium.org> | 2021-06-25 02:03:00 +0000 |
| commit | fae6584f0af2eeb4c34e04db6d7ab4aa1e0b6f6f (patch) | |
| tree | 05f2cb91630eb58a13d92152d0a74646fae473e7 | |
| parent | 43882761d1d01c58024e6c65152ebd784502bd96 (diff) | |
| download | chrome-ec-fae6584f0af2eeb4c34e04db6d7ab4aa1e0b6f6f.tar.gz | |
elemi: Tune displayport EQ with ps8815
Tune compensate for channel loss up to 10dB.
BUG=b:189587527
BRANCH=firmware-volteer-13672.B-main
TEST=Attached USBC to HDMI dongle.
i2ctrace to make sure the EQ is 10dB.
Signed-off-by: Devin Lu <Devin.Lu@quantatw.com>
Change-Id: Ieff6d645cb88875efc3f828919a152180d605479
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2972523
Reviewed-by: Abe Levkoy <alevkoy@chromium.org>
| -rw-r--r-- | board/elemi/board.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/board/elemi/board.c b/board/elemi/board.c index 8000c27332..b48dbc856e 100644 --- a/board/elemi/board.c +++ b/board/elemi/board.c @@ -228,6 +228,14 @@ static void kb_backlight_disable(void) } DECLARE_HOOK(HOOK_CHIPSET_SUSPEND, kb_backlight_disable, HOOK_PRIO_DEFAULT); +__override void board_ps8xxx_tcpc_init(int port) +{ + /* b/189587527: Set Displayport EQ loss up to 10dB */ + tcpc_addr_write(port, PS8751_I2C_ADDR1_P1_FLAGS, + PS8815_REG_DP_EQ_SETTING, + PS8815_DPEQ_LOSS_UP_10DB << PS8815_REG_DP_EQ_COMP_SHIFT); +} + /* * USB3 DB mux configuration - the top level mux still needs to be set to the * virtual_usb_mux_driver so the AP gets notified of mux changes and updates |