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mb/google/brya/var/{taeko, taeko4es}: Modify touchpad i2c signal 

Modify i2c signal to meet touchpad vendor spec.
Please see issue tracker for more details.

BUG=b:215487482
TEST=emerge-brya coreboot and check measured waveform in spec

Signed-off-by: Joey Peng <joey.peng@lcfc.corp-partner.google.com>
Change-Id: Ib3797d4e232654ada97092d9f2742ca040d0f0e4
Reviewed-on: https://review.coreboot.org/c/coreboot/+/61271
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
This commit is contained in:
Joey Peng 2022-01-20 18:50:43 +08:00 committed by Felix Held
parent 83c30a9cf1
commit 4337349883
2 changed files with 18 additions and 2 deletions
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10
src/mainboard/google/brya/variants/taeko/overridetree.cb
View File

@ -93,7 +93,15 @@ chip soc/intel/alderlake
.speed = I2C_SPEED_FAST,
},
.i2c[5] = {
.speed = I2C_SPEED_FAST,
.rise_time_ns = 650,
.fall_time_ns = 400,
.data_hold_time_ns = 500,
.speed_config[0] = {
.speed = I2C_SPEED_FAST,
.scl_lcnt = 160,
.scl_hcnt = 70,
.sda_hold = 40,
}
},
}"
# I2C Port Config

10
src/mainboard/google/brya/variants/taeko4es/overridetree.cb
View File

@ -89,7 +89,15 @@ chip soc/intel/alderlake
.speed = I2C_SPEED_FAST,
},
.i2c[5] = {
.speed = I2C_SPEED_FAST,
.rise_time_ns = 650,
.fall_time_ns = 400,
.data_hold_time_ns = 500,
.speed_config[0] = {
.speed = I2C_SPEED_FAST,
.scl_lcnt = 160,
.scl_hcnt = 70,
.sda_hold = 40,
}
},
}"
# I2C Port Config