diff options
| author | Seunghwan Kim <sh_.kim@samsung.corp-partner.google.com> | 2021-03-08 17:41:28 +0900 |
|---|---|---|
| committer | Karthik Ramasubramanian <kramasub@google.com> | 2021-04-05 15:32:09 +0000 |
| commit | 6ffaf5a6912233b7464609ad2b3df240574cf893 (patch) | |
| tree | 92d8dac084cff26eb0db151206821ac281484a33 /src/mainboard/google | |
| parent | 66c52ffb2bed60a9002755b5cf7f40ef25b3a1a2 (diff) | |
mb/google/dedede/var/sasuke: Configure I2C times for touchpad/audio
Configure I2C rise/fall time in device tree to ensure I2C CLK runs
accurately at I2C_SPEED_FAST (< 400 kHz).
Measured I2C frequency just as below after tuning:
I2C0(touchpad): 385 kHz
I2C4(audio): 380 kHz
BUG=b:180335053
BRANCH=dedede
TEST=Build and check after tuning I2C clock is under 400kHz
Change-Id: Ic92ee0379456e80260a8026bc38ee41325dad6d2
Signed-off-by: Seunghwan Kim <sh_.kim@samsung.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/51335
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>
Diffstat (limited to 'src/mainboard/google')
| -rw-r--r-- | src/mainboard/google/dedede/variants/sasuke/overridetree.cb | 13 |
1 files changed, 4 insertions, 9 deletions
diff --git a/src/mainboard/google/dedede/variants/sasuke/overridetree.cb b/src/mainboard/google/dedede/variants/sasuke/overridetree.cb index 2fb1d6120f..bcc4b49e1f 100644 --- a/src/mainboard/google/dedede/variants/sasuke/overridetree.cb +++ b/src/mainboard/google/dedede/variants/sasuke/overridetree.cb @@ -61,9 +61,8 @@ chip soc/intel/jasperlake }, .i2c[0] = { .speed = I2C_SPEED_FAST, - .rise_time_ns = 66, - .fall_time_ns = 90, - .data_hold_time_ns = 350, + .rise_time_ns = 209, + .fall_time_ns = 12, }, .i2c[1] = { .speed = I2C_SPEED_FAST, @@ -76,12 +75,8 @@ chip soc/intel/jasperlake }, .i2c[4] = { .speed = I2C_SPEED_FAST, - .speed_config[0] = { - .speed = I2C_SPEED_FAST, - .scl_lcnt = 176, - .scl_hcnt = 95, - .sda_hold = 36, - } + .rise_time_ns = 175, + .fall_time_ns = 8, }, }" device domain 0 on |