@@ -456,6 +456,9 @@ struct tcpm_port {
enum tcpm_ams next_ams;
bool in_ams;
+ /* Auto vbus discharge status */
+ bool auto_vbus_discharge_enabled;
+
#ifdef CONFIG_DEBUG_FS
struct dentry *dentry;
struct mutex logbuffer_lock; /* log buffer access lock */
@@ -525,6 +528,9 @@ static const char * const pd_rev[] = {
(tcpm_port_is_sink(port) && \
((port)->cc1 == TYPEC_CC_RP_3_0 || (port)->cc2 == TYPEC_CC_RP_3_0))
+#define tcpm_wait_for_discharge(port) \
+ (((port)->auto_vbus_discharge_enabled && !(port)->vbus_vsafe0v) ? PD_T_SAFE_0V : 0)
+
static enum tcpm_state tcpm_default_state(struct tcpm_port *port)
{
if (port->port_type == TYPEC_PORT_DRP) {
@@ -3439,6 +3445,8 @@ static int tcpm_src_attach(struct tcpm_port *port)
if (port->tcpc->enable_auto_vbus_discharge) {
ret = port->tcpc->enable_auto_vbus_discharge(port->tcpc, true);
tcpm_log_force(port, "enable vbus discharge ret:%d", ret);
+ if (!ret)
+ port->auto_vbus_discharge_enabled = true;
}
ret = tcpm_set_roles(port, true, TYPEC_SOURCE, tcpm_data_role_for_source(port));
@@ -3521,6 +3529,8 @@ static void tcpm_reset_port(struct tcpm_port *port)
if (port->tcpc->enable_auto_vbus_discharge) {
ret = port->tcpc->enable_auto_vbus_discharge(port->tcpc, false);
tcpm_log_force(port, "Disable vbus discharge ret:%d", ret);
+ if (!ret)
+ port->auto_vbus_discharge_enabled = false;
}
port->in_ams = false;
port->ams = NONE_AMS;
@@ -3593,6 +3603,8 @@ static int tcpm_snk_attach(struct tcpm_port *port)
tcpm_set_auto_vbus_discharge_threshold(port, TYPEC_PWR_MODE_USB, false, VSAFE5V);
ret = port->tcpc->enable_auto_vbus_discharge(port->tcpc, true);
tcpm_log_force(port, "enable vbus discharge ret:%d", ret);
+ if (!ret)
+ port->auto_vbus_discharge_enabled = true;
}
ret = tcpm_set_roles(port, true, TYPEC_SINK, tcpm_data_role_for_sink(port));
@@ -4695,9 +4707,9 @@ static void _tcpm_cc_change(struct tcpm_port *port, enum typec_cc_status cc1,
if (tcpm_port_is_disconnected(port) ||
!tcpm_port_is_source(port)) {
if (port->port_type == TYPEC_PORT_SRC)
- tcpm_set_state(port, SRC_UNATTACHED, 0);
+ tcpm_set_state(port, SRC_UNATTACHED, tcpm_wait_for_discharge(port));
else
- tcpm_set_state(port, SNK_UNATTACHED, 0);
+ tcpm_set_state(port, SNK_UNATTACHED, tcpm_wait_for_discharge(port));
}
break;
case SNK_UNATTACHED:
@@ -4728,7 +4740,23 @@ static void _tcpm_cc_change(struct tcpm_port *port, enum typec_cc_status cc1,
tcpm_set_state(port, SNK_DEBOUNCED, 0);
break;
case SNK_READY:
- if (tcpm_port_is_disconnected(port))
+ /*
+ * EXIT condition is based primarily on vbus disconnect and CC is secondary.
+ * "A port that has entered into USB PD communications with the Source and
+ * has seen the CC voltage exceed vRd-USB may monitor the CC pin to detect
+ * cable disconnect in addition to monitoring VBUS.
+ *
+ * A port that is monitoring the CC voltage for disconnect (but is not in
+ * the process of a USB PD PR_Swap or USB PD FR_Swap) shall transition to
+ * Unattached.SNK within tSinkDisconnect after the CC voltage remains below
+ * vRd-USB for tPDDebounce."
+ *
+ * When set_auto_vbus_discharge_threshold is enabled, CC pins go
+ * away before vbus decays to disconnect threshold. Allow
+ * disconnect to be driven by vbus disconnect when auto vbus
+ * discharge is enabled.
+ */
+ if (!port->auto_vbus_discharge_enabled && tcpm_port_is_disconnected(port))
tcpm_set_state(port, unattached_state(port), 0);
else if (!port->pd_capable &&
(cc1 != old_cc1 || cc2 != old_cc2))
@@ -4827,9 +4855,13 @@ static void _tcpm_cc_change(struct tcpm_port *port, enum typec_cc_status cc1,
* Ignore CC changes here.
*/
break;
-
default:
- if (tcpm_port_is_disconnected(port))
+ /*
+ * While acting as sink and auto vbus discharge is enabled, Allow disconnect
+ * to be driven by vbus disconnect.
+ */
+ if (tcpm_port_is_disconnected(port) && !(port->pwr_role == TYPEC_SINK &&
+ port->auto_vbus_discharge_enabled))
tcpm_set_state(port, unattached_state(port), 0);
break;
}
@@ -4993,8 +5025,16 @@ static void _tcpm_pd_vbus_off(struct tcpm_port *port)
case SRC_TRANSITION_SUPPLY:
case SRC_READY:
case SRC_WAIT_NEW_CAPABILITIES:
- /* Force to unattached state to re-initiate connection */
- tcpm_set_state(port, SRC_UNATTACHED, 0);
+ /*
+ * Force to unattached state to re-initiate connection.
+ * DRP port should move to Unattached.SNK instead of Unattached.SRC if
+ * sink removed. Although sink removal here is due to source's vbus collapse,
+ * treat it the same way for consistency.
+ */
+ if (port->port_type == TYPEC_PORT_SRC)
+ tcpm_set_state(port, SRC_UNATTACHED, tcpm_wait_for_discharge(port));
+ else
+ tcpm_set_state(port, SNK_UNATTACHED, tcpm_wait_for_discharge(port));
break;
case PORT_RESET:
@@ -5013,9 +5053,8 @@ static void _tcpm_pd_vbus_off(struct tcpm_port *port)
break;
default:
- if (port->pwr_role == TYPEC_SINK &&
- port->attached)
- tcpm_set_state(port, SNK_UNATTACHED, 0);
+ if (port->pwr_role == TYPEC_SINK && port->attached)
+ tcpm_set_state(port, SNK_UNATTACHED, tcpm_wait_for_discharge(port));
break;
}
}
@@ -5037,7 +5076,23 @@ static void _tcpm_pd_vbus_vsafe0v(struct tcpm_port *port)
tcpm_set_state(port, tcpm_try_snk(port) ? SNK_TRY : SRC_ATTACHED,
PD_T_CC_DEBOUNCE);
break;
+ case SRC_STARTUP:
+ case SRC_SEND_CAPABILITIES:
+ case SRC_SEND_CAPABILITIES_TIMEOUT:
+ case SRC_NEGOTIATE_CAPABILITIES:
+ case SRC_TRANSITION_SUPPLY:
+ case SRC_READY:
+ case SRC_WAIT_NEW_CAPABILITIES:
+ if (port->auto_vbus_discharge_enabled) {
+ if (port->port_type == TYPEC_PORT_SRC)
+ tcpm_set_state(port, SRC_UNATTACHED, 0);
+ else
+ tcpm_set_state(port, SNK_UNATTACHED, 0);
+ }
+ break;
default:
+ if (port->pwr_role == TYPEC_SINK && port->auto_vbus_discharge_enabled)
+ tcpm_set_state(port, SNK_UNATTACHED, 0);
break;
}
}