| Message ID | 20240809112901.535072-1-xu.yang_2@nxp.com |
|---|---|
| State | New |
| Headers | show |
| Series | Revert "usb: typec: tcpm: clear pd_event queue in PORT_RESET" | expand |
On Fri, Aug 09, 2024 at 07:29:01PM +0800, Xu Yang wrote: > This reverts commit bf20c69cf3cf9c6445c4925dd9a8a6ca1b78bfdf. > > During tcpm_init() stage, if the VBUS is still present after > tcpm_reset_port(), then we assume that VBUS will off and goto safe0v > after a specific discharge time. Following a TCPM_VBUS_EVENT event if > VBUS reach to off state. TCPM_VBUS_EVENT event may be set during > PORT_RESET handling stage. If pd_events reset to 0 after TCPM_VBUS_EVENT > set, we will lost this VBUS event. Then the port state machine may stuck > at one state. > > Before: > > [ 2.570172] pending state change PORT_RESET -> PORT_RESET_WAIT_OFF @ 100 ms [rev1 NONE_AMS] > [ 2.570179] state change PORT_RESET -> PORT_RESET_WAIT_OFF [delayed 100 ms] > [ 2.570182] pending state change PORT_RESET_WAIT_OFF -> SNK_UNATTACHED @ 920 ms [rev1 NONE_AMS] > [ 3.490213] state change PORT_RESET_WAIT_OFF -> SNK_UNATTACHED [delayed 920 ms] > [ 3.490220] Start toggling > [ 3.546050] CC1: 0 -> 0, CC2: 0 -> 2 [state TOGGLING, polarity 0, connected] > [ 3.546057] state change TOGGLING -> SRC_ATTACH_WAIT [rev1 NONE_AMS] > > After revert this patch, we can see VBUS off event and the port will goto > expected state. > > [ 2.441992] pending state change PORT_RESET -> PORT_RESET_WAIT_OFF @ 100 ms [rev1 NONE_AMS] > [ 2.441999] state change PORT_RESET -> PORT_RESET_WAIT_OFF [delayed 100 ms] > [ 2.442002] pending state change PORT_RESET_WAIT_OFF -> SNK_UNATTACHED @ 920 ms [rev1 NONE_AMS] > [ 2.442122] VBUS off > [ 2.442125] state change PORT_RESET_WAIT_OFF -> SNK_UNATTACHED [rev1 NONE_AMS] > [ 2.442127] VBUS VSAFE0V > [ 2.442351] CC1: 0 -> 0, CC2: 0 -> 0 [state SNK_UNATTACHED, polarity 0, disconnected] > [ 2.442357] Start toggling > [ 2.491850] CC1: 0 -> 0, CC2: 0 -> 2 [state TOGGLING, polarity 0, connected] > [ 2.491858] state change TOGGLING -> SRC_ATTACH_WAIT [rev1 NONE_AMS] > [ 2.491863] pending state change SRC_ATTACH_WAIT -> SNK_TRY @ 200 ms [rev1 NONE_AMS] > [ 2.691905] state change SRC_ATTACH_WAIT -> SNK_TRY [delayed 200 ms] > > Fixes: bf20c69cf3cf ("usb: typec: tcpm: clear pd_event queue in PORT_RESET") > Cc: stable@vger.kernel.org > Signed-off-by: Xu Yang <xu.yang_2@nxp.com> Acked-by: Heikki Krogerus <heikki.krogerus@linux.intel.com> > --- > drivers/usb/typec/tcpm/tcpm.c | 1 - > 1 file changed, 1 deletion(-) > > diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c > index cce39818e99a..4b02d6474259 100644 > --- a/drivers/usb/typec/tcpm/tcpm.c > +++ b/drivers/usb/typec/tcpm/tcpm.c > @@ -5655,7 +5655,6 @@ static void run_state_machine(struct tcpm_port *port) > break; > case PORT_RESET: > tcpm_reset_port(port); > - port->pd_events = 0; > if (port->self_powered) > tcpm_set_cc(port, TYPEC_CC_OPEN); > else > -- > 2.34.1
diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c index cce39818e99a..4b02d6474259 100644 --- a/drivers/usb/typec/tcpm/tcpm.c +++ b/drivers/usb/typec/tcpm/tcpm.c @@ -5655,7 +5655,6 @@ static void run_state_machine(struct tcpm_port *port) break; case PORT_RESET: tcpm_reset_port(port); - port->pd_events = 0; if (port->self_powered) tcpm_set_cc(port, TYPEC_CC_OPEN); else
This reverts commit bf20c69cf3cf9c6445c4925dd9a8a6ca1b78bfdf. During tcpm_init() stage, if the VBUS is still present after tcpm_reset_port(), then we assume that VBUS will off and goto safe0v after a specific discharge time. Following a TCPM_VBUS_EVENT event if VBUS reach to off state. TCPM_VBUS_EVENT event may be set during PORT_RESET handling stage. If pd_events reset to 0 after TCPM_VBUS_EVENT set, we will lost this VBUS event. Then the port state machine may stuck at one state. Before: [ 2.570172] pending state change PORT_RESET -> PORT_RESET_WAIT_OFF @ 100 ms [rev1 NONE_AMS] [ 2.570179] state change PORT_RESET -> PORT_RESET_WAIT_OFF [delayed 100 ms] [ 2.570182] pending state change PORT_RESET_WAIT_OFF -> SNK_UNATTACHED @ 920 ms [rev1 NONE_AMS] [ 3.490213] state change PORT_RESET_WAIT_OFF -> SNK_UNATTACHED [delayed 920 ms] [ 3.490220] Start toggling [ 3.546050] CC1: 0 -> 0, CC2: 0 -> 2 [state TOGGLING, polarity 0, connected] [ 3.546057] state change TOGGLING -> SRC_ATTACH_WAIT [rev1 NONE_AMS] After revert this patch, we can see VBUS off event and the port will goto expected state. [ 2.441992] pending state change PORT_RESET -> PORT_RESET_WAIT_OFF @ 100 ms [rev1 NONE_AMS] [ 2.441999] state change PORT_RESET -> PORT_RESET_WAIT_OFF [delayed 100 ms] [ 2.442002] pending state change PORT_RESET_WAIT_OFF -> SNK_UNATTACHED @ 920 ms [rev1 NONE_AMS] [ 2.442122] VBUS off [ 2.442125] state change PORT_RESET_WAIT_OFF -> SNK_UNATTACHED [rev1 NONE_AMS] [ 2.442127] VBUS VSAFE0V [ 2.442351] CC1: 0 -> 0, CC2: 0 -> 0 [state SNK_UNATTACHED, polarity 0, disconnected] [ 2.442357] Start toggling [ 2.491850] CC1: 0 -> 0, CC2: 0 -> 2 [state TOGGLING, polarity 0, connected] [ 2.491858] state change TOGGLING -> SRC_ATTACH_WAIT [rev1 NONE_AMS] [ 2.491863] pending state change SRC_ATTACH_WAIT -> SNK_TRY @ 200 ms [rev1 NONE_AMS] [ 2.691905] state change SRC_ATTACH_WAIT -> SNK_TRY [delayed 200 ms] Fixes: bf20c69cf3cf ("usb: typec: tcpm: clear pd_event queue in PORT_RESET") Cc: stable@vger.kernel.org Signed-off-by: Xu Yang <xu.yang_2@nxp.com> --- drivers/usb/typec/tcpm/tcpm.c | 1 - 1 file changed, 1 deletion(-)