rammus: ELAN touchpad I2C special timing requirement
According to issue tracker b:119899090.
https://partnerissuetracker.corp.google.com/issues/119899090
We modify rammus devicetree.cb .i2c[1] configuration to meet ELAN touchpad I2C special timing requirement.
BUG=b:119899090
BRANCH=firmware-rammus-11275.B
TEST=emerge-rammus coreboot chromeos-ec chromeos-bootimage
Flash FW to DUT, and check touchpad I2C characteristics meet requirement
Signed-off-by: YanRu chen <kane_chen@pegatron.corp-partner.google.com>
Change-Id: Ifeb08c2530e6a7674f23f7d48cefa16cfc59cb13
Reviewed-on: https://review.coreboot.org/c/29922
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/mainboard/google/poppy/variants/rammus/devicetree.cb b/src/mainboard/google/poppy/variants/rammus/devicetree.cb
index f10b84d..3af712f 100644
--- a/src/mainboard/google/poppy/variants/rammus/devicetree.cb
+++ b/src/mainboard/google/poppy/variants/rammus/devicetree.cb
@@ -191,7 +191,7 @@
.speed = I2C_SPEED_FAST,
.speed_config[0] = {
.speed = I2C_SPEED_FAST,
- .scl_lcnt = 190,
+ .scl_lcnt = 170,
.scl_hcnt = 100,
.sda_hold = 36,
},