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pd: dynamically adjust current limit based on CC pull-up

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Without a PD contract, regularly monitor CC line voltage to determine
if CC pull-up has changed its current advertisement.

BUG=chrome-os-partner:33682
BRANCH=samus
TEST=test with donette prototype: plug in one donette port to a samus,
see it set current limit to 3A, then plug in another port to a different
samus and see the first samus lower the current limit to 1.5A.

Signed-off-by: Alec Berg <alecaberg@chromium.org>
Change-Id: I965ab5fde7a67025f3f7ea34eb86fa35187080a6
Reviewed-on: https://chromium-review.googlesource.com/230594
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
Reviewed-by: Todd Broch <tbroch@chromium.org>
This commit is contained in:
Alec Berg
2014-11-18 15:06:27 -08:00
committed by chrome-internal-fetch
parent 2a9a859655
commit 88d63dcc6e
1 changed files with 30 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files

36
common/usb_pd_protocol.c
View File

@@ -190,6 +190,8 @@ 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_DEBOUNCE (15*MSEC) /* between 10ms and 20ms */
#define PD_T_SINK_ADJ (55*MSEC) /* between PD_T_DEBOUNCE and 60ms */
#define PD_T_SRC_RECOVER (760*MSEC) /* between 660ms and 1000ms */
/* from USB Type-C Specification Table 5-1 */
@@ -1454,6 +1456,7 @@ void pd_task(void)
int hard_reset_count = 0;
#ifdef CONFIG_CHARGE_MANAGER
static int initialized[PD_PORT_COUNT];
int typec_curr = 0, typec_curr_change = 0;
#endif /* CONFIG_CHARGE_MANAGER */
#endif /* CONFIG_USB_PD_DUAL_ROLE */
enum pd_states this_state;
@@ -1812,13 +1815,11 @@ void pd_task(void)
pd[port].data_role = PD_ROLE_UFP;
#ifdef CONFIG_CHARGE_MANAGER
initialized[port] = 1;
typec_curr = get_typec_current_limit(
pd[port].polarity ? cc2_volt :
cc1_volt);
typec_set_input_current_limit(
port,
get_typec_current_limit(pd[port].
polarity ?
cc2_volt :
cc1_volt),
TYPE_C_VOLTAGE);
port, typec_curr, TYPE_C_VOLTAGE);
#endif
set_state(port, PD_STATE_SNK_DISCOVERY);
timeout = 10*MSEC;
@@ -1876,6 +1877,29 @@ void pd_task(void)
PD_T_SINK_WAIT_CAP,
PD_STATE_HARD_RESET);
}
#ifdef CONFIG_CHARGE_MANAGER
timeout = PD_T_SINK_ADJ - PD_T_DEBOUNCE;
/* Check if CC pull-up has changed */
cc1_volt = pd_adc_read(port, pd[port].polarity);
if (typec_curr != get_typec_current_limit(cc1_volt)) {
/* debounce signal by requiring two reads */
if (typec_curr_change) {
/* set new input current limit */
typec_curr = get_typec_current_limit(
cc1_volt);
typec_set_input_current_limit(
port, typec_curr, TYPE_C_VOLTAGE);
} else {
/* delay for debounce */
timeout = PD_T_DEBOUNCE;
}
typec_curr_change = !typec_curr_change;
} else {
typec_curr_change = 0;
}
#endif
break;
case PD_STATE_SNK_REQUESTED:
/* Wait for ACCEPT or REJECT */