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| author | David Wu <david_wu@quanta.corp-partner.google.com> | 2019-12-19 17:20:53 +0800 |
|---|---|---|
| committer | Patrick Georgi <pgeorgi@google.com> | 2019-12-20 17:56:06 +0000 |
| commit | 6de7ecb585e705beab32e7464d364f2284ccae54 (patch) | |
| tree | a0e38984250781faa127a1b29eda3ceef41888ce | |
| parent | 9ac409c7e5062ee61d1259a20bf480ec6834d9b3 (diff) | |
| download | coreboot-6de7ecb585e705beab32e7464d364f2284ccae54.tar.xz | |
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>
| -rw-r--r-- | src/mainboard/google/hatch/variants/kindred/overridetree.cb | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/src/mainboard/google/hatch/variants/kindred/overridetree.cb b/src/mainboard/google/hatch/variants/kindred/overridetree.cb index 1122609649..a000add5b0 100644 --- a/src/mainboard/google/hatch/variants/kindred/overridetree.cb +++ b/src/mainboard/google/hatch/variants/kindred/overridetree.cb @@ -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, }, }" |