Furquan Shaikh has uploaded this change for review. ( https://review.coreboot.org/21242
Change subject: mainboard/google/soraka: Tune I2C params (hcnt, lcnt, hold time) ......................................................................
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 --- M src/mainboard/google/poppy/variants/soraka/devicetree.cb 1 file changed, 65 insertions(+), 12 deletions(-)
git pull ssh://review.coreboot.org:29418/coreboot refs/changes/42/21242/1
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 @@ -165,23 +165,76 @@ 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. register "gspi[0]" = "{ .speed_mhz = 1, - .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, }"