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| author | Duncan Laurie <dlaurie@chromium.org> | 2017-04-07 02:03:45 -0700 |
|---|---|---|
| committer | Duncan Laurie <dlaurie@chromium.org> | 2017-04-10 10:07:33 +0200 |
| commit | 92dde2fdd7516a026991116b7466f968e702828c (patch) | |
| tree | 72d19be2b14aebe91b064675cae39b7d2a54afc5 | |
| parent | 5bda642bcb0fc6004f08d8acdfe0e71d5b3c5012 (diff) | |
| download | coreboot-92dde2fdd7516a026991116b7466f968e702828c.tar.xz | |
google/eve: Update I2C bus timing
Update the I2C rise/fall timings based on newly measured values
on a new board with updated pull-up resistor values.
Touchscreen: rise time 98ns, fall time 38ms
Touchpad: rise time 111ns, fall time 41ns
TPM: rise time 112ns, fall time 34ns
BUG=b:35583133
BRANCH=none
TEST=Each I2C bus frequency was verified on a scope to be ~400MHz
Change-Id: Ibb3a15fa0cc862f36c1b9c63ac7847221020c4c0
Signed-off-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-on: https://review.coreboot.org/19202
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
| -rw-r--r-- | src/mainboard/google/eve/devicetree.cb | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/src/mainboard/google/eve/devicetree.cb b/src/mainboard/google/eve/devicetree.cb index d8f6362829..427ba6b916 100644 --- a/src/mainboard/google/eve/devicetree.cb +++ b/src/mainboard/google/eve/devicetree.cb @@ -163,7 +163,7 @@ chip soc/intel/skylake register "i2c_voltage[0]" = "I2C_VOLTAGE_3V3" register "i2c[0]" = "{ .speed = I2C_SPEED_FAST_PLUS, - .rise_time_ns = 17, + .rise_time_ns = 98, .fall_time_ns = 38, }" @@ -172,16 +172,16 @@ chip soc/intel/skylake register "i2c[1]" = "{ .early_init = 1, .speed = I2C_SPEED_FAST, - .rise_time_ns = 88, - .fall_time_ns = 32, + .rise_time_ns = 112, + .fall_time_ns = 34, }" # Touchpad register "i2c_voltage[2]" = "I2C_VOLTAGE_1V8" register "i2c[2]" = "{ .speed = I2C_SPEED_FAST, - .rise_time_ns = 247, - .fall_time_ns = 17, + .rise_time_ns = 111, + .fall_time_ns = 41, }" # Audio |