diff options
| author | Furquan Shaikh <furquan@chromium.org> | 2017-08-25 09:50:15 -0700 |
|---|---|---|
| committer | Furquan Shaikh <furquan@google.com> | 2017-08-28 01:19:36 +0000 |
| commit | c3e4f6344dfec53c0ac5a07632270816a30046b9 (patch) | |
| tree | fc7272dbbb00b5c184e0fc0e31e1ef98e490e083 /src/mainboard/google | |
| parent | 5bb27b7815b00ed789f474133eb52c73075a200f (diff) | |
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>
Diffstat (limited to 'src/mainboard/google')
| -rw-r--r-- | src/mainboard/google/poppy/variants/baseboard/devicetree.cb | 77 |
1 files changed, 65 insertions, 12 deletions
diff --git a/src/mainboard/google/poppy/variants/baseboard/devicetree.cb b/src/mainboard/google/poppy/variants/baseboard/devicetree.cb index 2324557320..6aba677ea2 100644 --- a/src/mainboard/google/poppy/variants/baseboard/devicetree.cb +++ b/src/mainboard/google/poppy/variants/baseboard/devicetree.cb @@ -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, |