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| author | Alec Berg <alecaberg@chromium.org> | 2014-05-22 15:15:28 -0700 |
|---|---|---|
| committer | chrome-internal-fetch <chrome-internal-fetch@google.com> | 2014-05-23 04:53:24 +0000 |
| commit | b19bd8f4382cbb8cd2572d0f9f51a14c91192c1c (patch) | |
| tree | 56f5ff0ffaf7890aa9ec045023ea4aecc4ef8c6a | |
| parent | 3dff34e653ff407b111ea9356e67af7edc02d3f2 (diff) | |
| download | chrome-ec-b19bd8f4382cbb8cd2572d0f9f51a14c91192c1c.tar.gz | |
pd: detect source disconnection
For non-PD aware source, ensure that we detect their disconnection when
the CC goes back below Vnc.
BUG=none
BRANCH=none
TEST=when zinger gets into state where it is not talking PD, remove
charger and make sure we transition to disconnected state.
Change-Id: I675ff6d3300eda680acdd7814f0163f222eeb516
Signed-off-by: Alec Berg <alecaberg@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/201156
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
| -rw-r--r-- | common/usb_pd_protocol.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/common/usb_pd_protocol.c b/common/usb_pd_protocol.c index 55a5c97334..2727bdc05a 100644 --- a/common/usb_pd_protocol.c +++ b/common/usb_pd_protocol.c @@ -750,6 +750,16 @@ void pd_task(void) timeout = 10*MSEC; break; case PD_STATE_SNK_DISCOVERY: + /* For non-PD aware source, detect source disconnect */ + cc1_volt = pd_adc_read(pd_polarity); + if (cc1_volt < PD_SNK_VA) { + /* The source disappeared ... */ + pd_task_state = PD_STATE_SNK_DISCONNECTED; + /* Debouncing */ + timeout = 50*MSEC; + break; + } + res = send_control(ctxt, PD_CTRL_GET_SOURCE_CAP); /* packet was acked => PD capable device) */ if (res >= 0) { |