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authorSeunghwan Kim <sh_.kim@samsung.corp-partner.google.com>2021-11-05 09:58:51 +0900
committerFelix Held <felix-coreboot@felixheld.de>2021-11-09 18:40:59 +0000
commit8fbfc080fcb6f61b21b1870c87fbe855bdd138e9 (patch)
tree833263e43d6cffa63b440d40987edf82d2fa46ee /src/mainboard/google/dedede/variants
parente9654a857f3b9a5ccfa6870d4da1a7c53c80dede (diff)
mb/google/dedede/var/bugzzy: Adjust I2C speed
This change adjusts all I2C speed to lower then 400KHz. The rise_time_ns and fall_time_ns values for each port are capured by a scope. BUG=None BRANCH=dedede TEST=built and verified adjusted I2C speed < 400KHz Signed-off-by: Seunghwan Kim <sh_.kim@samsung.corp-partner.google.com> Change-Id: I9504608dd8d9a5f5a3848ef34691557942c21023 Reviewed-on: https://review.coreboot.org/c/coreboot/+/58965 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Paul Menzel <paulepanter@mailbox.org> Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>
Diffstat (limited to 'src/mainboard/google/dedede/variants')
-rw-r--r--src/mainboard/google/dedede/variants/bugzzy/overridetree.cb6
1 files changed, 6 insertions, 0 deletions
diff --git a/src/mainboard/google/dedede/variants/bugzzy/overridetree.cb b/src/mainboard/google/dedede/variants/bugzzy/overridetree.cb
index 947fa4712e..e1318a8e46 100644
--- a/src/mainboard/google/dedede/variants/bugzzy/overridetree.cb
+++ b/src/mainboard/google/dedede/variants/bugzzy/overridetree.cb
@@ -63,12 +63,18 @@ chip soc/intel/jasperlake
},
.i2c[1] = {
.speed = I2C_SPEED_FAST,
+ .rise_time_ns = 133,
+ .fall_time_ns = 29,
},
.i2c[2] = {
.speed = I2C_SPEED_FAST,
+ .rise_time_ns = 227,
+ .fall_time_ns = 9,
},
.i2c[3] = {
.speed = I2C_SPEED_FAST,
+ .rise_time_ns = 91,
+ .fall_time_ns = 2,
},
.i2c[4] = {
.speed = I2C_SPEED_FAST,