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mb/google/rex/var/rex0: Configure I2C timing for I2C devices 

Configure I2C0/1/3/4 timing in devicetree to ensure I2C devices
meet timing requirement. Note that I2C5 timing will be updated
separately when the tuning done

BUG=b:280559903
TEST=Build and check I2C devices timing meet spec.

|             | I2C0-Codec | I2C0-WFC | I2C1   | I2C3  | I2C4    |
|-------------|------------|----------|--------|-------|---------|
| FSMB(KHz)   | 347        | 343.2    | 389.3  | 393.7 | 381.9   |
| TLOW(us)    | 2.1        | 2.093    | 1.895  | 1.902 | 1.953   |
| THIGH(us)   | 0.647      | 0.628    | 0.602  | 0.62  | 0.612   |
| THD:STA(us) | 0.633      | 0.64     | 0.601  | 0.6   | 0.601   |
| TSU:STA(us) | 0.617      | 0.621    | 0.619  | 0.659 | 0.61    |
| TSU:STO(us) | 0.656      | 0.647    | 0.667  | 0.727 | 0.634   |
| TBUF(us)    | 86.15      | >14.088  | >9.833 | >8    | >10.366 |

Signed-off-by: Ivy Jian <ivy.jian@quanta.corp-partner.google.com>
Change-Id: I5421e4fe68e856bbe9f19544954a94670c895a47
Reviewed-on: https://review.coreboot.org/c/coreboot/+/75150
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Subrata Banik <subratabanik@google.com>
Reviewed-by: Kapil Porwal <kapilporwal@google.com>
Reviewed-by: Tarun Tuli <taruntuli@google.com>
This commit is contained in:
Ivy Jian 2023-05-11 10:37:10 +08:00 committed by Subrata Banik
parent 1e13a2cfd6
commit 2eaa25a9d3
1 changed files with 5 additions and 5 deletions
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10
src/mainboard/google/rex/variants/rex0/overridetree.cb
View File

@ -116,26 +116,26 @@ chip soc/intel/meteorlake
register "common_soc_config" = "{ register "common_soc_config" = "{
.i2c[0] = { .i2c[0] = {
.speed = I2C_SPEED_FAST, .speed = I2C_SPEED_FAST,
.rise_time_ns = 650, .rise_time_ns = 400,
.fall_time_ns = 400, .fall_time_ns = 350,
.data_hold_time_ns = 50, .data_hold_time_ns = 50,
}, },
.i2c[1] = { .i2c[1] = {
.speed = I2C_SPEED_FAST, .speed = I2C_SPEED_FAST,
.rise_time_ns = 650, .rise_time_ns = 600,
.fall_time_ns = 400, .fall_time_ns = 400,
.data_hold_time_ns = 50, .data_hold_time_ns = 50,
}, },
.i2c[3] = { .i2c[3] = {
.speed = I2C_SPEED_FAST, .speed = I2C_SPEED_FAST,
.rise_time_ns = 650, .rise_time_ns = 600,
.fall_time_ns = 400, .fall_time_ns = 400,
.data_hold_time_ns = 50, .data_hold_time_ns = 50,
}, },
.i2c[4] = { .i2c[4] = {
.early_init = 1, .early_init = 1,
.speed = I2C_SPEED_FAST, .speed = I2C_SPEED_FAST,
.rise_time_ns = 600, .rise_time_ns = 550,
.fall_time_ns = 400, .fall_time_ns = 400,
.data_hold_time_ns = 50, .data_hold_time_ns = 50,
}, },