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| author | Aaron Durbin <adurbin@chromium.org> | 2016-11-03 13:34:13 -0500 |
|---|---|---|
| committer | Aaron Durbin <adurbin@chromium.org> | 2016-11-04 23:19:21 +0100 |
| commit | 85a80ef4726a0f088d7d2007553349b861908386 (patch) | |
| tree | d1044d0d5b97b81d0d19c4a4ddfea84d7fee92a6 | |
| parent | 242cb3b601396a5178680f7731b8d5f9d257c646 (diff) | |
| download | coreboot-85a80ef4726a0f088d7d2007553349b861908386.tar.xz | |
reef: tune trackpad i2c frequency to 400kHz
This brings the frequency down to 400kHz which is spec for
fast i2c.
BUG=chrome-os-partner:58889
Change-Id: Ibc5f152e55ed618f18ac6425264f086b1f2d1ffa
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://review.coreboot.org/17215
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
| -rw-r--r-- | src/mainboard/google/reef/variants/baseboard/devicetree.cb | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/src/mainboard/google/reef/variants/baseboard/devicetree.cb b/src/mainboard/google/reef/variants/baseboard/devicetree.cb index 559b0071be..5aa1d32ec2 100644 --- a/src/mainboard/google/reef/variants/baseboard/devicetree.cb +++ b/src/mainboard/google/reef/variants/baseboard/devicetree.cb @@ -84,6 +84,17 @@ chip soc/intel/apollolake } }" + # 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" |