GNUBoot
/
coreboot-kgpe-d16
2
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

mb/google/brya/var/omnigul: Adjust I2Cs CLK to be around 400 kHz 

Need to tune I2C bus 0/1/3/5 clock frequency under the 400kHz for
audio, TPM, touchscreen, and touchpad.

Tuning i2c frequency for omnigul
I2C0 - Audio CLK : 293.7khz
I2C1 - TPM CLK : 388.8khz
I2C3 - Touch Screen CLK : 294.8khz
I2C5 - Touch Pad CLK : 389.2khz

BUG=b:275061994
BRANCH=firmware-brya-14505.B
TEST=emerge-brya coreboot, and measure i2c clock.

Change-Id: I7c4fdf0e003318a69b870b487a60accefbc0ffed
Signed-off-by: Jamie Chen <jamie_chen@compal.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/74393
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Derek Huang <derekhuang@google.com>
Reviewed-by: Subrata Banik <subratabanik@google.com>
This commit is contained in:
Jamie Chen 2023-04-13 14:41:58 +08:00 committed by Felix Held
parent b68817d196
commit 60b22c4c57
1 changed files with 12 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
src/mainboard/google/brya/variants/omnigul/overridetree.cb
View File

@ -24,16 +24,28 @@ chip soc/intel/alderlake
register "common_soc_config" = "{ register "common_soc_config" = "{
.i2c[0] = { .i2c[0] = {
.speed = I2C_SPEED_FAST, .speed = I2C_SPEED_FAST,
.rise_time_ns = 650,
.fall_time_ns = 400,
.data_hold_time_ns = 50,
}, },
.i2c[1] = { .i2c[1] = {
.early_init = 1, .early_init = 1,
.speed = I2C_SPEED_FAST, .speed = I2C_SPEED_FAST,
.rise_time_ns = 600,
.fall_time_ns = 400,
.data_hold_time_ns = 50,
}, },
.i2c[3] = { .i2c[3] = {
.speed = I2C_SPEED_FAST, .speed = I2C_SPEED_FAST,
.rise_time_ns = 600,
.fall_time_ns = 400,
.data_hold_time_ns = 50,
}, },
.i2c[5] = { .i2c[5] = {
.speed = I2C_SPEED_FAST, .speed = I2C_SPEED_FAST,
.rise_time_ns = 650,
.fall_time_ns = 400,
.data_hold_time_ns = 50,
}, },
}" }"