diff options
| author | Tao Xia <xiatao5@huaqin.corp-partner.google.com> | 2021-05-13 16:02:02 +0800 |
|---|---|---|
| committer | Patrick Georgi <pgeorgi@google.com> | 2021-06-04 12:37:15 +0000 |
| commit | 35aafb3a2aecd43c85691fe1e607c17ba88ac793 (patch) | |
| tree | ea13ed0f0fc9a1ce72e8508653b83907c9163e08 /src/mainboard | |
| parent | 0b7bc80eba0c7e0ece1229eacc49a6a825a1b363 (diff) | |
mb/google/dedede/var/blipper: Configure I2C times for touchpad/touchpanel/codec
Configure I2C rise/fall time in device tree to ensure I2C
CLK runs accurately at I2C_SPEED_FAST (<400 kHz).
Measured I2C frequency changes are just as below after tuning:
touchpad: 434kHz ---> 391kHz
touchpanel: 439kHz ---> 382kHz
audio codec RT5682: 445kHz ---> 385kHz
BUG=b:187555396
BRANCH=dedede
TEST=Build and check after tuning I2C clock is under 400 kHz
Signed-off-by: Tao Xia <xiatao5@huaqin.corp-partner.google.com>
Change-Id: I8438e37be49f8a74f53fd8460110dac1a3f06993
Reviewed-on: https://review.coreboot.org/c/coreboot/+/54249
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>
Diffstat (limited to 'src/mainboard')
| -rw-r--r-- | src/mainboard/google/dedede/variants/blipper/overridetree.cb | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/src/mainboard/google/dedede/variants/blipper/overridetree.cb b/src/mainboard/google/dedede/variants/blipper/overridetree.cb index df3f9dd2e6..a5a7e48017 100644 --- a/src/mainboard/google/dedede/variants/blipper/overridetree.cb +++ b/src/mainboard/google/dedede/variants/blipper/overridetree.cb @@ -21,18 +21,24 @@ chip soc/intel/jasperlake }, .i2c[0] = { .speed = I2C_SPEED_FAST, + .rise_time_ns = 247, + .fall_time_ns = 11, }, .i2c[1] = { .speed = I2C_SPEED_FAST, }, .i2c[2] = { .speed = I2C_SPEED_FAST, + .rise_time_ns = 175, + .fall_time_ns = 20, }, .i2c[3] = { .speed = I2C_SPEED_FAST, }, .i2c[4] = { .speed = I2C_SPEED_FAST, + .rise_time_ns = 99, + .fall_time_ns = 7, }, }" |