diff options
| -rw-r--r-- | common/usb_pd_protocol.c | 20 |
1 files changed, 9 insertions, 11 deletions
diff --git a/common/usb_pd_protocol.c b/common/usb_pd_protocol.c index 2b3d5704aa..61850a98c2 100644 --- a/common/usb_pd_protocol.c +++ b/common/usb_pd_protocol.c @@ -1857,13 +1857,12 @@ static void handle_ctrl_request(int port, uint16_t head, /* * Give the source some time to send any messages before * we start our interrogation. Add some jitter of up to - * 100ms, taken from the current system time, to prevent - * multiple collisions. + * ~192ms to prevent multiple collisions. */ if (pd[port].task_state == PD_STATE_SNK_TRANSITION) pd[port].ready_state_holdoff_timer = get_time().val + SNK_READY_HOLD_OFF_US - + (get_time().le.lo % (100 * MSEC)); + + (get_time().le.lo & 0xf) * 12 * MSEC; set_state(port, PD_STATE_SNK_READY); pd_set_input_current_limit(port, pd[port].curr_limit, @@ -3620,19 +3619,18 @@ void pd_task(void *u) /* * Give the sink some time to send any messages * before we may send messages of our own. Add - * some jitter of up to 100ms, taken from the - * current system time, to prevent multiple - * collisions. This delay also allows the sink - * device to request power role swap and allow - * the the accept message to be sent prior to - * CMD_DISCOVER_IDENT being sent in the + * some jitter of up to ~192ms, to prevent + * multiple collisions. This delay also allows + * the sink device to request power role swap + * and allow the the accept message to be sent + * prior to CMD_DISCOVER_IDENT being sent in the * SRC_READY state. */ pd[port].ready_state_holdoff_timer = get_time().val + SRC_READY_HOLD_OFF_US - + (get_time().le.lo % (100 * MSEC)); + + (get_time().le.lo & 0xf) * 12 * MSEC; - /* it'a time to ping regularly the sink */ + /* it's time to ping regularly the sink */ set_state(port, PD_STATE_SRC_READY); } else { /* The sink did not ack, cut the power... */ |