From df3cbddb5825023d7788365f52c0c24ecc873b1b Mon Sep 17 00:00:00 2001 From: Johnny Li Date: Fri, 13 Nov 2020 16:30:31 +0800 Subject: mb/google/volteer/variants/volteer2: Tune Volteer2 I2C2 bus frequency The current I2C2 bus frequency is 344 kHZ, which does not meet the spec. This change updates scl_lcnt, scl_hcnt, sda_hold value for I2C2 to bring the bus frequency closer to 400 kHz. BUG=b:153588771 TEST=Verified that I2C2 frequency is 380 kHz. Signed-off-by: Johnny Li Change-Id: I96fa5ed586de41324733ac7537b6bd73f39fc176 Reviewed-on: https://review.coreboot.org/c/coreboot/+/47558 Reviewed-by: Caveh Jalali Reviewed-by: Tim Wawrzynczak Tested-by: build bot (Jenkins) --- src/mainboard/google/volteer/variants/volteer2/overridetree.cb | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'src/mainboard/google/volteer') diff --git a/src/mainboard/google/volteer/variants/volteer2/overridetree.cb b/src/mainboard/google/volteer/variants/volteer2/overridetree.cb index e4da0e6252..72cb79ac92 100644 --- a/src/mainboard/google/volteer/variants/volteer2/overridetree.cb +++ b/src/mainboard/google/volteer/variants/volteer2/overridetree.cb @@ -36,6 +36,12 @@ chip soc/intel/tigerlake }, .i2c[2] = { .speed = I2C_SPEED_FAST, + .speed_config[0] = { + .speed = I2C_SPEED_FAST, + .scl_lcnt = 163, + .scl_hcnt = 75, + .sda_hold = 36, + }, }, .i2c[3] = { .speed = I2C_SPEED_FAST, -- cgit v1.2.3