mainboard/google/soraka: 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: 393 - 397
I2C1: 393 - 400
I2C2: 392 - 400
I2C4: 392 - 400
I2C5: 392 - 400
Change-Id: I3e12c75eb7e82a83aa6a6bcfcc11c12f83f2d3d4
Signed-off-by: Furquan Shaikh <furquan@chromium.org>
Reviewed-on: https://review.coreboot.org/21242
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
diff --git a/src/mainboard/google/poppy/variants/soraka/devicetree.cb b/src/mainboard/google/poppy/variants/soraka/devicetree.cb
index 88c7c7d..3366f26 100644
--- a/src/mainboard/google/poppy/variants/soraka/devicetree.cb
+++ b/src/mainboard/google/poppy/variants/soraka/devicetree.cb
@@ -165,12 +165,71 @@
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 = 180,
+ .scl_hcnt = 85,
+ .sda_hold = 36,
+ },
+ }"
+
+ # H1
+ register "i2c_voltage[1]" = "I2C_VOLTAGE_3V3"
+ # 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,
+ .speed = I2C_SPEED_FAST,
+ .speed_config[0] = {
+ .speed = I2C_SPEED_FAST,
+ .scl_lcnt = 190,
+ .scl_hcnt = 90,
+ .sda_hold = 36,
+ },
+ }"
+
+ # Camera
+ register "i2c_voltage[2]" = "I2C_VOLTAGE_1V8"
+ register "i2c[2]" = "{
+ .speed = I2C_SPEED_FAST,
+ .speed_config[0] = {
+ .speed = I2C_SPEED_FAST,
+ .scl_lcnt = 192,
+ .scl_hcnt = 90,
+ .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 = 90,
+ .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 = 180,
+ .scl_hcnt = 80,
+ .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 @@
.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,