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| author | Jan Dabros <jsd@semihalf.com> | 2021-04-15 23:47:04 +0200 |
|---|---|---|
| committer | Commit Bot <commit-bot@chromium.org> | 2021-04-22 14:15:38 +0000 |
| commit | 888e830480de3840ab11299a708267b97a339927 (patch) | |
| tree | fd02c4376257189b08a9be480589d62ccfead386 /board/lindar | |
| parent | a1d6eed22f8b364a9eed261eb6f165a7d22698af (diff) | |
| download | chrome-ec-888e830480de3840ab11299a708267b97a339927.tar.gz | |
gl3590: Add a delay to allow hub release i2c lines
GL3590 (USB3 hub) chip may drive I2C_SDA and I2C_SCL lines after being
released from reset. Max time for such "activities" is 200ms. In order
to ensure correct operations on the i2c bus, we need to delay all i2c
transactions in the system by such value.
Implementation is using hook with higher priority than I2C_INIT. This
guarantees that:
* SoC won't start i2c transactions before 200ms mark after GL3590's
RESETJ# pin deassertion;
* Original order of loading all generic modules (e.g. ioex_init,
board_init) won't need to be changed;
* Workaround applied only in platform-specific code.
BUG=b:181930164
BRANCH=main
TEST=build and flash new servo_v4p1 firmware
Plug in CHG and DUT cables. _Then_ plug in HOST cable and verify that
green diode is lit on servo_v4p1 board indicating proper pass-through
charging.
Signed-off-by: Jan Dabros <jsd@semihalf.com>
Change-Id: I32971d421eb541c788a87701ce5e8c62a8b35777
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2829770
Reviewed-by: Aseda Aboagye <aaboagye@chromium.org>
Diffstat (limited to 'board/lindar')
0 files changed, 0 insertions, 0 deletions