diff options
| author | Denis Brockus <dbrockus@chromium.org> | 2019-08-16 08:04:11 -0600 |
|---|---|---|
| committer | Commit Bot <commit-bot@chromium.org> | 2019-08-23 18:04:37 +0000 |
| commit | 5b3ef3d1d46f84aa20b36d4d4e92e5bbb46bc2b0 (patch) | |
| tree | 8efbc90cbfdc9f7d1d99c0cc974ddd189e7c73ca | |
| parent | 7f9543f3bb9019deec8c70d4c8d1d84cb7538c27 (diff) | |
| download | chrome-ec-5b3ef3d1d46f84aa20b36d4d4e92e5bbb46bc2b0.tar.gz | |
USBC PD: update usb-c doc
change new state machine file references to be up to date with
the current code.
BUG=none
BRANCH=none
TEST=none
Change-Id: I4182b71bea107c4b9b852b93dcf59be5f4616f4d
Signed-off-by: Denis Brockus <dbrockus@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/1757086
Reviewed-by: Jett Rink <jettrink@chromium.org>
Commit-Queue: Jett Rink <jettrink@chromium.org>
| -rw-r--r-- | docs/usb-c.md | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/docs/usb-c.md b/docs/usb-c.md index 6952488469..1723ac7921 100644 --- a/docs/usb-c.md +++ b/docs/usb-c.md @@ -83,8 +83,11 @@ Right now platform/ec has two different implementations of USB-C PD stack. [`usb_pd_protocol.c`](../common/usb_pd_protocol.c) 2. The newer implementation is broken up into multiple different files and state machines - * Policy engine state machine files, such as `usb_pe_*_sm.c`. - * Type-C physical layer state machine: `usb_tc_sm.c` + * Policy engine state machine files, `usb_pe_*_sm.c`. + * Protocol engine state machine file, `usb_prl_sm.c`. + * State machine manager file, `usb_sm.c`. + * Type-C physical layer state machine files, `usb_tc_*_sm.c`. + * USB-C PD Task file, `usbc_task.c`. The older implementation supports firmware for device types other than Chromebooks. For example, the older stack supports the Zinger, which is the @@ -106,7 +109,7 @@ In both older and newer implementations, the following details apply: * The `PD_C#` task runs the state machine (old or new) for the port and communicates with the TCPC, MUX, and PPC. This task needs a large task stack. - * The `PD_INT_C#` tasks runs at a higher priority than the state machine + * The `PD_INT_C#` tasks run at a higher priority than the state machine task, and its sole job is to receive interrupts from the TCPC as quickly as possible then send appropriate messages to other tasks (including `PD_C#`). This task shouldn't need much stack space, but the i2c |