diff options
Diffstat (limited to 'drivers/usb/typec/tcpm/tcpm.c')
| -rw-r--r-- | drivers/usb/typec/tcpm/tcpm.c | 28 |
1 files changed, 25 insertions, 3 deletions
diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c index 3ef37202ee37..a48e3f90d196 100644 --- a/drivers/usb/typec/tcpm/tcpm.c +++ b/drivers/usb/typec/tcpm/tcpm.c @@ -3372,13 +3372,31 @@ static void run_state_machine(struct tcpm_port *port) tcpm_set_state(port, SNK_HARD_RESET_SINK_OFF, 0); break; case SRC_HARD_RESET_VBUS_OFF: - tcpm_set_vconn(port, true); + /* + * 7.1.5 Response to Hard Resets + * Hard Reset Signaling indicates a communication failure has occurred and the + * Source Shall stop driving VCONN, Shall remove Rp from the VCONN pin and Shall + * drive VBUS to vSafe0V as shown in Figure 7-9. + */ + tcpm_set_vconn(port, false); tcpm_set_vbus(port, false); tcpm_set_roles(port, port->self_powered, TYPEC_SOURCE, tcpm_data_role_for_source(port)); - tcpm_set_state(port, SRC_HARD_RESET_VBUS_ON, PD_T_SRC_RECOVER); + /* + * If tcpc fails to notify vbus off, TCPM will wait for PD_T_SAFE_0V + + * PD_T_SRC_RECOVER before turning vbus back on. + * From Table 7-12 Sequence Description for a Source Initiated Hard Reset: + * 4. Policy Engine waits tPSHardReset after sending Hard Reset Signaling and then + * tells the Device Policy Manager to instruct the power supply to perform a + * Hard Reset. The transition to vSafe0V Shall occur within tSafe0V (t2). + * 5. After tSrcRecover the Source applies power to VBUS in an attempt to + * re-establish communication with the Sink and resume USB Default Operation. + * The transition to vSafe5V Shall occur within tSrcTurnOn(t4). + */ + tcpm_set_state(port, SRC_HARD_RESET_VBUS_ON, PD_T_SAFE_0V + PD_T_SRC_RECOVER); break; case SRC_HARD_RESET_VBUS_ON: + tcpm_set_vconn(port, true); tcpm_set_vbus(port, true); port->tcpc->set_pd_rx(port->tcpc, true); tcpm_set_attached_state(port, true); @@ -3944,7 +3962,11 @@ static void _tcpm_pd_vbus_off(struct tcpm_port *port) tcpm_set_state(port, SNK_HARD_RESET_WAIT_VBUS, 0); break; case SRC_HARD_RESET_VBUS_OFF: - tcpm_set_state(port, SRC_HARD_RESET_VBUS_ON, 0); + /* + * After establishing the vSafe0V voltage condition on VBUS, the Source Shall wait + * tSrcRecover before re-applying VCONN and restoring VBUS to vSafe5V. + */ + tcpm_set_state(port, SRC_HARD_RESET_VBUS_ON, PD_T_SRC_RECOVER); break; case HARD_RESET_SEND: break; |