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mb/google/dedede/var/lantis: Config I2C high and low time for touchscreen/audio 

Config I2C high / low time in device tree to ensure I2C
CLK runs accurately at I2C_SPEED_FAST (400 kHz).

These tuning value is applied from touchpad as a base line,
and EE measured touchscreen/audio runs at 399/396.7kHz after tuning.

BUG=b:173709409
BRANCH=dedede
TEST=Build and check after tuning I2C clock is under 400kHz

Change-Id: I970d69e6361d7cf6fcfc4e5b0b3c5fbfa885367c
Signed-off-by: Tony Huang <tony-huang@quanta.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/49020
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Fagerburg <pfagerburg@chromium.org>
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>
This commit is contained in:
Tony Huang 2020-12-31 09:47:10 +08:00 committed by Karthik Ramasubramanian
parent 3564c739a2
commit 50dc0633db
1 changed files with 12 additions and 0 deletions
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12
src/mainboard/google/dedede/variants/lantis/overridetree.cb
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@ -42,9 +42,21 @@ chip soc/intel/jasperlake
},
.i2c[2] = {
.speed = I2C_SPEED_FAST,
.speed_config[0] = {
.speed = I2C_SPEED_FAST,
.scl_lcnt = 185,
.scl_hcnt = 95,
.sda_hold = 40,
}
},
.i2c[4] = {
.speed = I2C_SPEED_FAST,
.speed_config[0] = {
.speed = I2C_SPEED_FAST,
.scl_lcnt = 185,
.scl_hcnt = 95,
.sda_hold = 40,
}
},
}"