diff options
| author | Justin TerAvest <teravest@chromium.org> | 2018-01-31 13:07:54 -0700 |
|---|---|---|
| committer | Martin Roth <martinroth@google.com> | 2018-02-06 16:08:05 +0000 |
| commit | ad282592b450c6309abe829f3c4e0d2b0111fb31 (patch) | |
| tree | efb99f11ad7c401e2a9f7d221ae577d129d617a3 /src/mainboard/google | |
| parent | f9d9781292aab5ea6c4a5058aca895b575e279a7 (diff) | |
mb/google/kahlee: Fix grunt I2C rise/fall times
I2C bus rise/fall times were measured as follows. Signals were generated
with:
- bus 0: manual i2c driver in depthcharge
- bus 2,3: i2cdetect -r <bus_number>
and then measured manually with an oscilloscope.
BUG=b:72442912
Change-Id: I291e144249271ec34a93417398e54e68b8e21e23
Signed-off-by: Justin TerAvest <teravest@chromium.org>
Reviewed-on: https://review.coreboot.org/23520
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Diffstat (limited to 'src/mainboard/google')
| -rw-r--r-- | src/mainboard/google/kahlee/variants/grunt/devicetree.cb | 18 |
1 files changed, 9 insertions, 9 deletions
diff --git a/src/mainboard/google/kahlee/variants/grunt/devicetree.cb b/src/mainboard/google/kahlee/variants/grunt/devicetree.cb index 9665a78675..7ffc0aca0c 100644 --- a/src/mainboard/google/kahlee/variants/grunt/devicetree.cb +++ b/src/mainboard/google/kahlee/variants/grunt/devicetree.cb @@ -21,11 +21,11 @@ chip soc/amd/stoneyridge register "uma_mode" = "UMAMODE_SPECIFIED_SIZE" register "uma_size" = "128 * MiB" - # TODO(teravest): Fix speeds here. + # Enable I2C0 for audio, USB3 hub at 400kHz register "i2c[0]" = "{ .speed = I2C_SPEED_FAST, - .rise_time_ns = 104, - .fall_time_ns = 52, + .rise_time_ns = 95, + .fall_time_ns = 3, }" # Enable I2C1 for H1 at 400kHz @@ -36,18 +36,18 @@ chip soc/amd/stoneyridge .fall_time_ns = 4, }" - # TODO(teravest): Fix speeds here. + # Enable I2C2 for trackpad, pen at 400kHz register "i2c[2]" = "{ .speed = I2C_SPEED_FAST, - .rise_time_ns = 104, - .fall_time_ns = 52, + .rise_time_ns = 117, + .fall_time_ns = 113, }" - # TODO(teravest): Fix speeds here. + # Enable I2C3 for touchscreen at 400kHz register "i2c[3]" = "{ .speed = I2C_SPEED_FAST, - .rise_time_ns = 104, - .fall_time_ns = 52, + .rise_time_ns = 82, + .fall_time_ns = 67, }" device cpu_cluster 0 on |