diff options
| author | Tony Huang <tony-huang@quanta.corp-partner.google.com> | 2020-12-31 09:47:10 +0800 |
|---|---|---|
| committer | Karthik Ramasubramanian <kramasub@google.com> | 2021-01-07 05:32:56 +0000 |
| commit | 50dc0633dbb5a839e5b4e19f8ecc8faa5e682ad2 (patch) | |
| tree | d8d3e64b0e63240c034d1a463239fc93e646a317 /src/mainboard/google/dedede | |
| parent | 3564c739a2d9c64936ab73c45ce702bd8067c183 (diff) | |
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 <tony-huang@quanta.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/49020
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Fagerburg <pfagerburg@chromium.org>
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>
Diffstat (limited to 'src/mainboard/google/dedede')
| -rw-r--r-- | src/mainboard/google/dedede/variants/lantis/overridetree.cb | 12 |
1 files changed, 12 insertions, 0 deletions
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, + } }, }" |