summaryrefslogtreecommitdiff
path: root/src/mainboard
diff options
context:
space:
mode:
authorTao Xia <xiatao5@huaqin.corp-partner.google.com>2021-03-18 16:18:06 +0800
committerPatrick Georgi <pgeorgi@google.com>2021-03-28 16:02:54 +0000
commitfd952aaa50aff91f19781648c9952b59ce315445 (patch)
tree248d8c072014e27e7c752c98406d24f223b4dcd3 /src/mainboard
parent2fa96eb33eeefa745b2ac8639e3c9d48fe6778e0 (diff)
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')
-rw-r--r--src/mainboard/google/dedede/variants/storo/overridetree.cb10
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,
},
}"