krane: Enable BC12 detection with gpio controlled.

Support CONFIG_BC12_DETECT_POWER_ROLE_TRIGGER.

Krane's BC12 detection is controlled by GPIO_BC12_DET_EN by
disconnecting USB-PHY, that is:
- Assert GPIO_BC12_DET_EN, then USB-PHY is disconnected
- Deassert GPIO_BC12_DET_EN, then USB-PHY is connected.

The current usb_chg_task will make USB devices not be enumerated, since
GPIO_BC12_DET_EN is deasserted only when VBUS attached and BC12 device
identified.  However, peripherals won't trigger BC12 detection so
GPIO_BC12_DET_EN always asserted.

To fix this problem, we trigger BC12 detection only when a port is
attached and hook USB_PD_CONNECTED to toggle BC12 detection.

We have to
- Assert GPIO_BC12_DET_EN on SRC device plugged to recognize BC12 charger.
- After BC12 device detected, we have to disable BC12 to connect USB-PHY
  back for enumerating USB devices.
- Deassert GPIO_BC12_DET_EN on SNK device plugged to enumerate USB
  devices.

TEST=Test with https://crrev.com/c/1408751/1, and see it is able to
     recognize Apple 2.4A charger and 5V2A DCP charger.
TEST=Boot w/ USB hub plugged (w/ and w/o external BC1.2 charger on the hub)
     and see USB devices are enumerated.
BUG=b:122866184
BRANCH=None

Change-Id: I5b3362305361c0c950288fc83072e9bc79082c08
Signed-off-by: Yilun Lin <yllin@google.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/1575050
Tested-by: Yilun Lin <yllin@chromium.org>
Auto-Submit: Yilun Lin <yllin@chromium.org>
Reviewed-by: Aseda Aboagye <aaboagye@chromium.org>
Commit-Queue: Yilun Lin <yllin@chromium.org>

0 files changed, 0 insertions, 0 deletions