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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 <johnny_li@wistron.corp-partner.google.com>
Change-Id: I96fa5ed586de41324733ac7537b6bd73f39fc176
Reviewed-on: https://review.coreboot.org/c/coreboot/+/47558
Reviewed-by: Caveh Jalali <caveh@chromium.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Johnny Li 2020-11-13 16:30:31 +08:00 committed by Tim Wawrzynczak
parent 1fe129f321
commit df3cbddb58
1 changed files with 6 additions and 0 deletions
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6
src/mainboard/google/volteer/variants/volteer2/overridetree.cb
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@ -36,6 +36,12 @@ chip soc/intel/tigerlake
}, },
.i2c[2] = { .i2c[2] = {
.speed = I2C_SPEED_FAST, .speed = I2C_SPEED_FAST,
.speed_config[0] = {
.speed = I2C_SPEED_FAST,
.scl_lcnt = 163,
.scl_hcnt = 75,
.sda_hold = 36,
},
}, },
.i2c[3] = { .i2c[3] = {
.speed = I2C_SPEED_FAST, .speed = I2C_SPEED_FAST,