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mb/google/hatch/var/kindred: Decrease i2c frequency below 400 KHz 

Before tuning i2c frequency,
I2C0: 479.4 KHz
I2C1: 491.4 KHz
I2C4: 476.4 KHz

After tuning i2c frequency,
I2C0: 391.8 KHz
I2C1: 396.4 KHz
I2C4: 388.8 KHz

BUG=b:146535585
BRANCH=hatch
TEST=emerge-hatch coreboot chromeos-bootimage

Change-Id: I55d095efb60eba4e860b54bb90e8e0df62d88419
Signed-off-by: David Wu <david_wu@quanta.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/37831
Reviewed-by: Philip Chen <philipchen@google.com>
Reviewed-by: Paul Fagerburg <pfagerburg@chromium.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
David Wu 2019-12-19 17:20:53 +08:00 committed by Patrick Georgi
parent 9ac409c7e5
commit 6de7ecb585
1 changed files with 6 additions and 0 deletions
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6
src/mainboard/google/hatch/variants/kindred/overridetree.cb
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@ -36,12 +36,18 @@ chip soc/intel/cannonlake
},
.i2c[0] = {
.speed = I2C_SPEED_FAST,
.rise_time_ns = 50,
.fall_time_ns = 15,
},
.i2c[1] = {
.speed = I2C_SPEED_FAST,
.rise_time_ns = 60,
.fall_time_ns = 25,
},
.i2c[4] = {
.speed = I2C_SPEED_FAST,
.rise_time_ns = 60,
.fall_time_ns = 60,
},
}"