Peichao Li has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/43661 )
Change subject: mb/google/zork/vilboz: Tune I2C bus 3 clock ......................................................................
mb/google/zork/vilboz: Tune I2C bus 3 clock
Tune I2C bus 3 clock and insure it meets I2C spec.
BUG=b:161650117 TEST==flash coreboot to the DUT and measure I2C bus 3 clock frequency less than 400KHz
Signed-off-by: Peichao.Wang peichao.wang@bitland.corp-partner.google.com Change-Id: Ifa9f0bce723f55a12fd2313788c995f8326e3e7d --- M src/mainboard/google/zork/variants/vilboz/overridetree.cb 1 file changed, 2 insertions(+), 2 deletions(-)
git pull ssh://review.coreboot.org:29418/coreboot refs/changes/61/43661/1
diff --git a/src/mainboard/google/zork/variants/vilboz/overridetree.cb b/src/mainboard/google/zork/variants/vilboz/overridetree.cb index 49d21d5..9129e2a 100644 --- a/src/mainboard/google/zork/variants/vilboz/overridetree.cb +++ b/src/mainboard/google/zork/variants/vilboz/overridetree.cb @@ -28,8 +28,8 @@ # I2C3 for H1 register "i2c[3]" = "{ .speed = I2C_SPEED_FAST, - .rise_time_ns = 184, /* 0 to 1.26v (1.8 * .7) */ - .fall_time_ns = 42, /* 1.26v to 0 */ + .rise_time_ns = 110, + .fall_time_ns = 5, .early_init = true, }"