Tao Xia has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/56016 )
Change subject: mb/google/dedede/var/sasukette: Configure I2C times for touchpad ......................................................................
mb/google/dedede/var/sasukette: Configure I2C times for touchpad
Configure I2C high / low time in the device tree to ensure I2C CLK runs accurately between 380 kHz and 400 kHz.
Measured I2C frequency just as below after tuning: touchpad:390.4 kHz
BUG=b:192601250 BRANCH=dedede TEST=Build and check after tuning I2C clock is between 380 kHz and 400 kHz
Signed-off-by: Tao Xia xiatao5@huaqin.corp-partner.google.com Change-Id: Ibe1603a48a3e841b6a50aa0c703697ec615b2854 --- M src/mainboard/google/dedede/variants/sasukette/overridetree.cb 1 file changed, 2 insertions(+), 2 deletions(-)
git pull ssh://review.coreboot.org:29418/coreboot refs/changes/16/56016/1
diff --git a/src/mainboard/google/dedede/variants/sasukette/overridetree.cb b/src/mainboard/google/dedede/variants/sasukette/overridetree.cb index a39b9d1..776ba8a 100644 --- a/src/mainboard/google/dedede/variants/sasukette/overridetree.cb +++ b/src/mainboard/google/dedede/variants/sasukette/overridetree.cb @@ -23,8 +23,8 @@ .speed = I2C_SPEED_FAST, .speed_config[0] = { .speed = I2C_SPEED_FAST, - .scl_lcnt = 185, - .scl_hcnt = 95, + .scl_lcnt = 180, + .scl_hcnt = 90, .sda_hold = 40, } },