diff options
| author | Alec Berg <alecaberg@chromium.org> | 2014-05-17 16:08:05 -0700 |
|---|---|---|
| committer | chrome-internal-fetch <chrome-internal-fetch@google.com> | 2014-05-21 20:35:47 +0000 |
| commit | f52b23e96423fa0447013d58da1c6677ac8ae9f8 (patch) | |
| tree | 83dc601edaa46e9310dff542eaf7784b3aadcddc /common | |
| parent | ffac23c0ea1bd4ff4568f5bd709a98f912b833a7 (diff) | |
| download | chrome-ec-f52b23e96423fa0447013d58da1c6677ac8ae9f8.tar.gz | |
samus_pd: when sinking power detect loss of VBUS and disconnect
Detect loss of VBUS when acting as PD sink and go to the disconnected
state. This allows us to renegotiate power when power supply drops
and switches to 5V.
BUG=none
BRANCH=none
TEST=On a samus, tested by running for a couple of hours, and verifying
that occasionally when zinger drops from 20V to 5V, we detect it and
go to the disconnected state. Note, this only happens a couple times
every hour.
Change-Id: I237d267824ff564662c9c02e525ce2613ed229e6
Signed-off-by: Alec Berg <alecaberg@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/200365
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
Diffstat (limited to 'common')
| -rw-r--r-- | common/usb_pd_protocol.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/common/usb_pd_protocol.c b/common/usb_pd_protocol.c index d15f9bcc0e..48e2763712 100644 --- a/common/usb_pd_protocol.c +++ b/common/usb_pd_protocol.c @@ -778,6 +778,14 @@ void pd_task(void) break; case PD_STATE_SNK_READY: /* we have power and we are happy */ + + /* if we have lost vbus, go back to disconnected */ + if (!pd_snk_is_vbus_provided()) { + pd_task_state = PD_STATE_SNK_DISCONNECTED; + /* set timeout small to reconnect fast */ + timeout = 5*MSEC; + } + /* check vital parameters from time to time */ timeout = 100*MSEC; break; |