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pd: implement source recovery time after hard reset

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Implemented source recovery time following a hard reset. According
to the spec:

After a hard reset, the source must dissipate output voltage
to vSafe5V. After establishing the safe voltage condition on VBUS,
the power supply shall wait tSrcRecover before powering VBUS to
vSafe5V.

BUG=none
BRANCH=samus
TEST=plug in a type-c to type-a adapter to samus. then issue a hard
reset from the console and verify that it takes nearly a second before
samus re-enables vbus.

Change-Id: Id21eb7cf03759b7ecd64ad11c3c57e66cf35370a
Signed-off-by: Alec Berg <alecaberg@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/222935
Reviewed-by: Vic Yang <victoryang@chromium.org>
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
This commit is contained in:
Alec Berg
2014-10-10 14:59:50 -07:00
committed by chrome-internal-fetch
parent 2e1c48823c
commit ce6cb6effa
1 changed files with 8 additions and 0 deletions
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8
common/usb_pd_protocol.c
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@@ -170,6 +170,7 @@ static const uint8_t dec4b5b[] = {
/* DRP_SNK + DRP_SRC must be between 50ms and 100ms with 30%-70% duty cycle */
#define PD_T_DRP_SNK (40*MSEC) /* toggle time for sink DRP */
#define PD_T_DRP_SRC (30*MSEC) /* toggle time for source DRP */
#define PD_T_SRC_RECOVER (760*MSEC) /* between 660ms and 1000ms */
/* Port role at startup */
#ifdef CONFIG_USB_PD_DUAL_ROLE
@@ -214,6 +215,8 @@ static struct pd_protocol {
enum pd_states timeout_state;
/* Timeout for the current state. Set to 0 for no timeout. */
uint64_t timeout;
/* Time for source recovery after hard reset */
uint64_t src_recover;
/* Flag for sending pings in SRC_READY */
uint8_t ping_enabled;
@@ -655,6 +658,7 @@ static void execute_hard_reset(int port)
set_state(port, PD_STATE_SRC_DISCONNECTED);
#endif
pd_power_supply_reset(port);
pd[port].src_recover = get_time().val + PD_T_SRC_RECOVER;
CPRINTF("HARD RESET!\n");
}
@@ -1233,6 +1237,10 @@ void pd_task(void)
cc2_volt = pd_adc_read(port, 1);
if ((cc1_volt < PD_SRC_VNC) ||
(cc2_volt < PD_SRC_VNC)) {
/* Break if in hard reset recovery time */
if (get_time().val < pd[port].src_recover)
break;
pd[port].polarity =
GET_POLARITY(cc1_volt, cc2_volt);
pd_select_polarity(port, pd[port].polarity);