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mainboard/google/poppy: Tune I2C params (hcnt, lcnt, hold time) 

Tune I2C params for I2C buses 0, 1, 2, 4 and 5 to ensure that the
frequency does not exceed 400KHz.

BUG=b:35948024
TEST=Verified for 25 iterations that the frequency on each bus ranges
<= 400KHz.

I2C0: 375 - 400
I2C1: 377 - 400
I2C2: 377 - 400
I2C4: 375 - 397
I2C5: 375 - 397

Change-Id: Ie30e1a12b66c4660b648a585c4dfd66faf004129
Signed-off-by: Furquan Shaikh <furquan@chromium.org>
Reviewed-on: https://review.coreboot.org/21208
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Furquan Shaikh 2017-08-25 09:50:15 -07:00 committed by Furquan Shaikh
parent 5bb27b7815
commit c3e4f6344d
1 changed files with 65 additions and 12 deletions
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77
src/mainboard/google/poppy/variants/baseboard/devicetree.cb
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@ -165,12 +165,71 @@ chip soc/intel/skylake
register "usb3_ports[2]" = "USB3_PORT_DEFAULT(OC_SKIP)" # Type-A Port
register "usb3_ports[3]" = "USB3_PORT_EMPTY" # Empty
register "i2c_voltage[0]" = "I2C_VOLTAGE_3V3" # Touchscreen
register "i2c_voltage[1]" = "I2C_VOLTAGE_3V3" # H1
register "i2c_voltage[2]" = "I2C_VOLTAGE_1V8" # Camera
register "i2c_voltage[3]" = "I2C_VOLTAGE_1V8" # Pen
register "i2c_voltage[4]" = "I2C_VOLTAGE_1V8" # Camera
register "i2c_voltage[5]" = "I2C_VOLTAGE_1V8" # Audio
# Touchscreen
register "i2c_voltage[0]" = "I2C_VOLTAGE_3V3"
register "i2c[0]" = "{
.speed = I2C_SPEED_FAST,
.speed_config[0] = {
.speed = I2C_SPEED_FAST,
.scl_lcnt = 185,
.scl_hcnt = 90,
.sda_hold = 36,
},
}"
# H1
register "i2c_voltage[1]" = "I2C_VOLTAGE_3V3"
register "i2c[1]" = "{
.speed = I2C_SPEED_FAST,
.speed_config[0] = {
.speed = I2C_SPEED_FAST,
.scl_lcnt = 190,
.scl_hcnt = 100,
.sda_hold = 36,
},
.early_init = 1,
}"
# Camera
register "i2c_voltage[2]" = "I2C_VOLTAGE_1V8"
register "i2c[2]" = "{
.speed = I2C_SPEED_FAST,
.speed_config[0] = {
.speed = I2C_SPEED_FAST,
.scl_lcnt = 190,
.scl_hcnt = 97,
.sda_hold = 36,
},
}"
# Pen
register "i2c_voltage[3]" = "I2C_VOLTAGE_1V8"
# Camera
register "i2c_voltage[4]" = "I2C_VOLTAGE_1V8"
register "i2c[4]" = "{
.speed = I2C_SPEED_FAST,
.speed_config[0] = {
.speed = I2C_SPEED_FAST,
.scl_lcnt = 190,
.scl_hcnt = 97,
.sda_hold = 36,
},
}"
# Audio
register "i2c_voltage[5]" = "I2C_VOLTAGE_1V8"
register "i2c[5]" = "{
.speed = I2C_SPEED_FAST,
.speed_config[0] = {
.speed = I2C_SPEED_FAST,
.scl_lcnt = 190,
.scl_hcnt = 98,
.sda_hold = 36,
},
}"
# Use GSPI0 for cr50 TPM. Early init is required to set up a BAR for TPM
# communication before memory is up.
@ -179,12 +238,6 @@ chip soc/intel/skylake
.early_init = 1,
}"
# Configure I2C1 for cr50 TPM. Early init is required to set up a BAR
# for TPM communication before memory is up.
register "i2c[1]" = "{
.early_init = 1,
}"
# Must leave UART0 enabled or SD/eMMC will not work as PCI
register "SerialIoDevMode" = "{
[PchSerialIoIndexI2C0] = PchSerialIoPci,