From 50dc0633dbb5a839e5b4e19f8ecc8faa5e682ad2 Mon Sep 17 00:00:00 2001 From: Tony Huang Date: Thu, 31 Dec 2020 09:47:10 +0800 Subject: mb/google/dedede/var/lantis: Config I2C high and low time for touchscreen/audio Config I2C high / low time in device tree to ensure I2C CLK runs accurately at I2C_SPEED_FAST (400 kHz). These tuning value is applied from touchpad as a base line, and EE measured touchscreen/audio runs at 399/396.7kHz after tuning. BUG=b:173709409 BRANCH=dedede TEST=Build and check after tuning I2C clock is under 400kHz Change-Id: I970d69e6361d7cf6fcfc4e5b0b3c5fbfa885367c Signed-off-by: Tony Huang Reviewed-on: https://review.coreboot.org/c/coreboot/+/49020 Tested-by: build bot (Jenkins) Reviewed-by: Paul Fagerburg Reviewed-by: Karthik Ramasubramanian --- src/mainboard/google/dedede/variants/lantis/overridetree.cb | 12 ++++++++++++ 1 file changed, 12 insertions(+) (limited to 'src/mainboard/google/dedede/variants/lantis') diff --git a/src/mainboard/google/dedede/variants/lantis/overridetree.cb b/src/mainboard/google/dedede/variants/lantis/overridetree.cb index 1f5331155c..297a5c0a97 100644 --- a/src/mainboard/google/dedede/variants/lantis/overridetree.cb +++ b/src/mainboard/google/dedede/variants/lantis/overridetree.cb @@ -42,9 +42,21 @@ chip soc/intel/jasperlake }, .i2c[2] = { .speed = I2C_SPEED_FAST, + .speed_config[0] = { + .speed = I2C_SPEED_FAST, + .scl_lcnt = 185, + .scl_hcnt = 95, + .sda_hold = 40, + } }, .i2c[4] = { .speed = I2C_SPEED_FAST, + .speed_config[0] = { + .speed = I2C_SPEED_FAST, + .scl_lcnt = 185, + .scl_hcnt = 95, + .sda_hold = 40, + } }, }" -- cgit v1.2.3