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| author | Tao Xia <xiatao5@huaqin.corp-partner.google.com> | 2021-03-18 16:18:06 +0800 |
|---|---|---|
| committer | Patrick Georgi <pgeorgi@google.com> | 2021-03-28 16:02:54 +0000 |
| commit | fd952aaa50aff91f19781648c9952b59ce315445 (patch) | |
| tree | 248d8c072014e27e7c752c98406d24f223b4dcd3 /src/mainboard/google/dedede | |
| parent | 2fa96eb33eeefa745b2ac8639e3c9d48fe6778e0 (diff) | |
| download | coreboot-fd952aaa50aff91f19781648c9952b59ce315445.tar.xz | |
mb/google/dedede/var/storo: Configure I2C times for I2C devices
Configure I2C high / low time in device tree to ensure I2C
CLK runs accurately at I2C_SPEED_FAST (400 kHz).
Measured I2C frequency just as below after tuning:
touchpad:371.63 kHz
touchpanel:368.24 kHz
audio codec RT5682:369.13 kHz
speaker AMP L:366.21 kHz
speaker AMP R:365.8 kHz
P-sensor:368.34 kHz
MIPI Camera:363.35 kHz
BUG=b:181589325
BRANCH=dedede
TEST=Build and check after tuning I2C clock is under 400kHz
Signed-off-by: Tao Xia <xiatao5@huaqin.corp-partner.google.com>
Change-Id: I1a755a54540e106b41ac427f84989ed7e8037558
Reviewed-on: https://review.coreboot.org/c/coreboot/+/51624
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Diffstat (limited to 'src/mainboard/google/dedede')
| -rw-r--r-- | src/mainboard/google/dedede/variants/storo/overridetree.cb | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/src/mainboard/google/dedede/variants/storo/overridetree.cb b/src/mainboard/google/dedede/variants/storo/overridetree.cb index 0025fece98..b3a8e2203e 100644 --- a/src/mainboard/google/dedede/variants/storo/overridetree.cb +++ b/src/mainboard/google/dedede/variants/storo/overridetree.cb @@ -26,21 +26,31 @@ chip soc/intel/jasperlake }, .i2c[0] = { .speed = I2C_SPEED_FAST, + .rise_time_ns = 125, + .fall_time_ns = 19, }, .i2c[1] = { .speed = I2C_SPEED_FAST, }, .i2c[2] = { .speed = I2C_SPEED_FAST, + .rise_time_ns = 86, + .fall_time_ns = 5, }, .i2c[3] = { .speed = I2C_SPEED_FAST, + .rise_time_ns = 84, + .fall_time_ns = 4, }, .i2c[4] = { .speed = I2C_SPEED_FAST, + .rise_time_ns = 69, + .fall_time_ns = 3, }, .i2c[5] = { .speed = I2C_SPEED_FAST, + .rise_time_ns = 129, + .fall_time_ns = 4, }, }" |