diff options
| author | Kevin Chiu <Kevin.Chiu@quantatw.com> | 2016-11-09 09:52:55 +0800 |
|---|---|---|
| committer | Martin Roth <martinroth@google.com> | 2016-11-10 16:50:48 +0100 |
| commit | 961d6d45a6c5520c7a379c4d9b3002d1e8320e3e (patch) | |
| tree | aacea9043917f93f684bdcf41710591f3991fa5f /src | |
| parent | 49ef5aa99b567b6d01428c5f43e55f5808712921 (diff) | |
google/pyro: Tune i2c frequency to 400 Khz
tune i2c devices clk for pyro:
I2C0: audio da7219
I2C2: TPM H1
I2C3: wacom touchscreen
I2C4: elan touchpad
BUG=chrome-os-partner:58881
BRANCH=master
TEST=emerge-pyro coreboot chromeos-bootimage
Change-Id: If3c92ed260277c27a94d2fcf7883e9441519e40e
Signed-off-by: Kevin Chiu <Kevin.Chiu@quantatw.com>
Reviewed-on: https://review.coreboot.org/17331
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Diffstat (limited to 'src')
| -rw-r--r-- | src/mainboard/google/reef/variants/pyro/devicetree.cb | 47 |
1 files changed, 45 insertions, 2 deletions
diff --git a/src/mainboard/google/reef/variants/pyro/devicetree.cb b/src/mainboard/google/reef/variants/pyro/devicetree.cb index 0e71398d6a..7405b37edc 100644 --- a/src/mainboard/google/reef/variants/pyro/devicetree.cb +++ b/src/mainboard/google/reef/variants/pyro/devicetree.cb @@ -66,8 +66,51 @@ chip soc/intel/apollolake register "gpe0_dw2" = "PMC_GPE_N_63_32" register "gpe0_dw3" = "PMC_GPE_SW_31_0" - # Enable I2C2 bus early for TPM access - register "i2c[2].early_init" = "1" + # Limit I2C0 Audio codec da7219 speed to 400kHz with manually tuned values. + register "i2c[0]" = "{ + .speed = I2C_SPEED_FAST, + .speed_config[0] = { + .speed = I2C_SPEED_FAST, + .scl_lcnt = 0xd0, + .scl_hcnt = 0x68, + .sda_hold = 0x27, + } + }" + + # Enable I2C2 bus early for TPM access and configure as 400kHz + # with manually tuned values. + register "i2c[2]" = "{ + .early_init = 1, + .speed = I2C_SPEED_FAST, + .speed_config[0] = { + .speed = I2C_SPEED_FAST, + .scl_lcnt = 0xd0, + .scl_hcnt = 0x68, + .sda_hold = 0x27, + } + }" + + # Limit I2C3 WACOM touchscreen speed to 400kHz with manually tuned values. + register "i2c[3]" = "{ + .speed = I2C_SPEED_FAST, + .speed_config[0] = { + .speed = I2C_SPEED_FAST, + .scl_lcnt = 0xd0, + .scl_hcnt = 0x68, + .sda_hold = 0x27, + } + }" + + # Limit trackpad speed to 400kHz with manually tuned values. + register "i2c[4]" = "{ + .speed = I2C_SPEED_FAST, + .speed_config[0] = { + .speed = I2C_SPEED_FAST, + .scl_lcnt = 0xd0, + .scl_hcnt = 0x68, + .sda_hold = 0x27, + } + }" # Minimum SLP S3 assertion width 28ms. register "slp_s3_assertion_width_usecs" = "28000" |