diff options
| author | John Su <john_su@compal.corp-partner.google.com> | 2022-02-16 14:59:07 +0800 |
|---|---|---|
| committer | Felix Held <felix-coreboot@felixheld.de> | 2022-02-21 15:21:28 +0000 |
| commit | bf81c24e078c3eaea6cc2cd53e681579543c03a2 (patch) | |
| tree | 536e3b220f4229e85ee4ebdeaf7378f13107c99c /src/mainboard/google | |
| parent | aa41f773976f17979a6a32cc7f34d57df89aaeed (diff) | |
mb/google/brya/variants/felwinter: Adjust I2Cs CLK to be around 400 kHz
Need to tune I2C bus 0/1/3/5 clock frequency under the 400kHz for
audio, TPM, touchscreen, and touchpad.
Audio CLK: 385 kHz
TPM CLK: 380.5 kHz
Touch Screen CLK: 373.3 kHz
Touch Pad CLK: 372.7 kHz
BUG=b:218577918
BRANCH=master
TEST=emerge-brya coreboot chromeos-bootimage
measure by scope with felwinter.
Signed-off-by: John Su <john_su@compal.corp-partner.google.com>
Change-Id: I3e5cc10d6605f9cc41fa6b31da07a81364b72fe0
Reviewed-on: https://review.coreboot.org/c/coreboot/+/62009
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Reviewed-by: EricR Lai <ericr_lai@compal.corp-partner.google.com>
Diffstat (limited to 'src/mainboard/google')
| -rw-r--r-- | src/mainboard/google/brya/variants/felwinter/overridetree.cb | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/src/mainboard/google/brya/variants/felwinter/overridetree.cb b/src/mainboard/google/brya/variants/felwinter/overridetree.cb index 1bde55c9b9..d1842764f3 100644 --- a/src/mainboard/google/brya/variants/felwinter/overridetree.cb +++ b/src/mainboard/google/brya/variants/felwinter/overridetree.cb @@ -58,16 +58,28 @@ chip soc/intel/alderlake register "common_soc_config" = "{ .i2c[0] = { .speed = I2C_SPEED_FAST, + .rise_time_ns = 550, + .fall_time_ns = 400, + .data_hold_time_ns = 50, }, .i2c[1] = { .early_init = 1, .speed = I2C_SPEED_FAST, + .rise_time_ns = 550, + .fall_time_ns = 400, + .data_hold_time_ns = 50, }, .i2c[3] = { .speed = I2C_SPEED_FAST, + .rise_time_ns = 550, + .fall_time_ns = 400, + .data_hold_time_ns = 50, }, .i2c[5] = { .speed = I2C_SPEED_FAST, + .rise_time_ns = 550, + .fall_time_ns = 400, + .data_hold_time_ns = 50, }, }" |