* FAILED: patch "[PATCH] usb: typec: tcpm: constrain TCPM_SOURCING_VBUS event handling" failed to apply to 5.10-stable tree
@ 2026-09-08 12:29 gregkh
2026-09-10 11:08 ` [PATCH 5.10.y 1/2] usb: typec: tcpm: fix debug accessory mode detection for sink ports Sasha Levin
0 siblings, 1 reply; 3+ messages in thread
From: gregkh @ 2026-09-08 12:29 UTC (permalink / raw)
To: amitsd, badhri, gregkh, heikki.krogerus, stable; +Cc: stable
The patch below does not apply to the 5.10-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.
To reproduce the conflict and resubmit, you may use the following commands:
git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.10.y
git checkout FETCH_HEAD
git cherry-pick -x cd3b9cea675bbfebc223f007dc2f4e79524fa54c
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2026090804-natural-naming-bb59@gregkh' --subject-prefix 'PATCH 5.10.y' 'HEAD^..'
Possible dependencies:
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From cd3b9cea675bbfebc223f007dc2f4e79524fa54c Mon Sep 17 00:00:00 2001
From: Amit Sunil Dhamne <amitsd@google.com>
Date: Thu, 27 Aug 2026 21:16:17 +0000
Subject: [PATCH] usb: typec: tcpm: constrain TCPM_SOURCING_VBUS event handling
When a sink detach occurs while waiting for TX send status, the old
TCPM_SOURCING_VBUS event along with TCPM_VBUS_EVENT and TCPM_CC_EVENT
can be queued in port->pd_events. Because TCPM_SOURCING_VBUS is
evaluated after TCPM_VBUS_EVENT and TCPM_CC_EVENT in
tcpm_pd_event_handler(), a stale TCPM_SOURCING_VBUS event can override
the detach handling and incorrectly set port->vbus_source and
port->vbus_present to true.
Add a state guard to check that the port is either operating as a
Source (tcpm_port_is_source(port)) or in a Fast Role Swap (FRS) state
up to FR_SWAP_SNK_SRC_SOURCE_VBUS_APPLIED before processing
TCPM_SOURCING_VBUS. Otherwise, discard and log the event.
Log snippet for error condition before fix:
[72792.204955] state change SRC_ATTACHED -> SRC_STARTUP [rev3 NONE_AMS]
[72792.204960] sourcing vbus
[72792.204962] VBUS on
[72792.204970] AMS POWER_NEGOTIATION start
[72792.204974] cc:=4
[72792.205319] state change SRC_STARTUP -> AMS_START [rev3 POWER_NEGOTIATION]
[72792.205325] state change AMS_START -> SRC_SEND_CAPABILITIES [rev3 POWER_NEGOTIATION]
[72792.205332] PD TX, header: 0x11a1
[72792.216911] PD TX complete, status: 2
[72792.216957] pending state change SRC_SEND_CAPABILITIES -> SRC_SEND_CAPABILITIES @ 150 ms [rev3 POWER_NEGOTIATION]
[72792.218005] VBUS off
[72792.218013] pending state change SRC_SEND_CAPABILITIES -> SNK_UNATTACHED @ 650 ms [rev3 POWER_NEGOTIATION]
[72792.218020] VBUS VSAFE0V
[72792.218024] state change SRC_SEND_CAPABILITIES -> SNK_UNATTACHED [rev3 POWER_NEGOTIATION]
[72792.218458] CC1: 2 -> 0, CC2: 0 -> 0 [state SNK_UNATTACHED, polarity 0, disconnected]
[72792.218467] VBUS on --> VBUS left on
[72792.218980] disable vbus discharge ret:0
[72792.235193] Start toggling
After fix:
[ 1195.291691] state change SRC_ATTACHED -> SRC_STARTUP [rev3 NONE_AMS]
[ 1195.291698] sourcing vbus
[ 1195.291700] VBUS on
[ 1195.291707] AMS POWER_NEGOTIATION start
[ 1195.291710] cc:=4
[ 1195.291758] state change SRC_STARTUP -> AMS_START [rev3 POWER_NEGOTIATION]
[ 1195.291794] state change AMS_START -> SRC_SEND_CAPABILITIES [rev3 POWER_NEGOTIATION]
[ 1195.291798] PD TX, header: 0x11a1
[ 1195.297056] PD TX complete, status: 2
[ 1195.297092] pending state change SRC_SEND_CAPABILITIES -> SRC_SEND_CAPABILITIES @ 150 ms [rev3 POWER_NEGOTIATION]
[ 1195.297177] VBUS off
[ 1195.297184] pending state change SRC_SEND_CAPABILITIES -> SNK_UNATTACHED @ 650 ms [rev3 POWER_NEGOTIATION]
[ 1195.297227] CC1: 2 -> 0, CC2: 0 -> 0 [state SRC_SEND_CAPABILITIES, polarity 0, disconnected]
[ 1195.307469] cc:=2
[ 1195.307544] pending state change SRC_SEND_CAPABILITIES -> SNK_UNATTACHED @ 650 ms [rev3 POWER_NEGOTIATION]
[ 1195.307555] Discarding sourcing vbus! Invalid state SRC_SEND_CAPABILITIES
[ 1195.957636] state change SRC_SEND_CAPABILITIES -> SNK_UNATTACHED [delayed 650 ms]
[ 1195.957732] disable vbus discharge ret:0
[ 1195.970196] Start toggling
[ 1195.970468] VBUS off
[ 1196.051637] VBUS off
[ 1196.051642] VBUS VSAFE0V
Fixes: 8dc4bd073663 ("usb: typec: tcpm: Add support for Sink Fast Role SWAP(FRS)")
Cc: stable <stable@kernel.org>
Assisted-by: Gemini:gemini-3.1-pro
Signed-off-by: Amit Sunil Dhamne <amitsd@google.com>
Reviewed-by: Badhri Jagan Sridharan <badhri@google.com>
Acked-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Link: https://patch.msgid.link/20260827-sourcing-vbus-v1-1-9be1aca991a0@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
index a8cd1959c426..2d6b14aa2085 100644
--- a/drivers/usb/typec/tcpm/tcpm.c
+++ b/drivers/usb/typec/tcpm/tcpm.c
@@ -7119,16 +7119,32 @@ static void tcpm_pd_event_handler(struct kthread_work *work)
}
}
if (events & TCPM_SOURCING_VBUS) {
- tcpm_log(port, "sourcing vbus");
/*
* In fast role swap case TCPC autonomously sources vbus. Set vbus_source
- * true as TCPM wouldn't have called tcpm_set_vbus.
+ * true conditionally as TCPM wouldn't have called tcpm_set_vbus.
+ * If TCPM calls tcpm_set_vbus to source vbus, vbus_source would already
+ * be true.
*
- * When vbus is sourced on the command on TCPM i.e. TCPM called
- * tcpm_set_vbus to source vbus, vbus_source would already be true.
+ * When TCPM_FRS_EVENT and TCPM_SOURCING_VBUS arrive simultaneously,
+ * handling TCPM_FRS_EVENT above transitions the state to AMS_START
+ * with upcoming_state FR_SWAP_SEND.
*/
- port->vbus_source = true;
- _tcpm_pd_vbus_on(port);
+
+ if (tcpm_port_is_source(port) ||
+ tcpm_port_is_debug_source(port) ||
+ (port->state == AMS_START && port->upcoming_state == FR_SWAP_SEND) ||
+ port->state == FR_SWAP_SEND ||
+ port->state == FR_SWAP_SEND_TIMEOUT ||
+ port->state == FR_SWAP_SNK_SRC_TRANSITION_TO_OFF ||
+ port->state == FR_SWAP_SNK_SRC_NEW_SINK_READY ||
+ port->state == FR_SWAP_SNK_SRC_SOURCE_VBUS_APPLIED) {
+ tcpm_log(port, "sourcing vbus");
+ port->vbus_source = true;
+ _tcpm_pd_vbus_on(port);
+ } else {
+ tcpm_log(port, "Discarding sourcing vbus! Invalid state %s",
+ tcpm_states[port->state]);
+ }
}
if (events & TCPM_PORT_CLEAN) {
tcpm_log(port, "port clean");
^ permalink raw reply related [flat|nested] 3+ messages in thread
* [PATCH 5.10.y 1/2] usb: typec: tcpm: fix debug accessory mode detection for sink ports
2026-09-08 12:29 FAILED: patch "[PATCH] usb: typec: tcpm: constrain TCPM_SOURCING_VBUS event handling" failed to apply to 5.10-stable tree gregkh
@ 2026-09-10 11:08 ` Sasha Levin
2026-09-10 11:08 ` [PATCH 5.10.y 2/2] usb: typec: tcpm: constrain TCPM_SOURCING_VBUS event handling Sasha Levin
0 siblings, 1 reply; 3+ messages in thread
From: Sasha Levin @ 2026-09-10 11:08 UTC (permalink / raw)
To: stable
Cc: Xu Yang, stable, Heikki Krogerus, Amit Sunil Dhamne,
Greg Kroah-Hartman, Sasha Levin
From: Xu Yang <xu.yang_2@nxp.com>
[ Upstream commit f6ec9bb4acc7182b25a793ad094a764e1cb819a7 ]
The port in debug accessory mode can be either a source or sink. The
previous tcpm_port_is_debug() function only checked for source port.
Commit 8db73e6a42b6 ("usb: typec: tcpm: allow sink (ufp) to toggle into
accessory mode debug") changed the detection logic to support both roles,
but left some logic in _tcpm_cc_change() unchanged, This causes the state
machine to transition to an incorrect state when operating as a sink in
debug accessory mode. Log as below:
[ 978.637541] CC1: 0 -> 5, CC2: 0 -> 5 [state TOGGLING, polarity 0, connected]
[ 978.637567] state change TOGGLING -> SRC_ATTACH_WAIT [rev1 NONE_AMS]
[ 978.637596] pending state change SRC_ATTACH_WAIT -> DEBUG_ACC_ATTACHED @ 180 ms [rev1 NONE_AMS]
[ 978.647098] CC1: 5 -> 0, CC2: 5 -> 5 [state SRC_ATTACH_WAIT, polarity 0, connected]
[ 978.647115] state change SRC_ATTACH_WAIT -> SRC_ATTACH_WAIT [rev1 NONE_AMS]
It should go to SNK_ATTACH_WAIT instead of SRC_ATTACH_WAIT state.
To fix this, add tcpm_port_is_debug_source() and tcpm_port_is_debug_sink()
helper to explicitly identify the power mode in debug accessory mode.
Update the state transition logic in _tcpm_cc_change() to ensure the state
machine transitions comply with Type-C specification. Also update the logic
in run_state_machine() to keep consistency.
Fixes: 8db73e6a42b6 ("usb: typec: tcpm: allow sink (ufp) to toggle into accessory mode debug")
Cc: stable <stable@kernel.org>
Signed-off-by: Xu Yang <xu.yang_2@nxp.com>
Acked-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Reviewed-by: Amit Sunil Dhamne <amitsd@google.com>
Link: https://patch.msgid.link/20260424074009.2979266-1-xu.yang_2@nxp.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
[5.10 dependency adaptation: This tree does not contain 8db73e6a42b6
or sink debug accessory support. Retain the source debug predicate and
its source-path callers, and keep tcpm_port_is_debug() source-only.
Drop the sink predicate and sink accessory state transitions, which
require the missing feature. This supplies tcpm_port_is_debug_source()
for cd3b9cea675b without changing 5.10 accessory behavior or adding
functions. The target applies with a three-way merge; its references
to AMS_START and upcoming_state still require a separate 5.10 adaptation
because AMS and Collision Avoidance was not backported.]
Stable-dep-of: cd3b9cea675b ("usb: typec: tcpm: constrain TCPM_SOURCING_VBUS event handling")
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/usb/typec/tcpm/tcpm.c | 11 +++++++----
1 file changed, 7 insertions(+), 4 deletions(-)
diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
index 992901274a243..5cd39ad963e1c 100644
--- a/drivers/usb/typec/tcpm/tcpm.c
+++ b/drivers/usb/typec/tcpm/tcpm.c
@@ -420,9 +420,12 @@ struct pd_rx_event {
(tcpm_cc_is_source((port)->cc2) && \
!tcpm_cc_is_source((port)->cc1)))
-#define tcpm_port_is_debug(port) \
+#define tcpm_port_is_debug_source(port) \
(tcpm_cc_is_source((port)->cc1) && tcpm_cc_is_source((port)->cc2))
+#define tcpm_port_is_debug(port) \
+ tcpm_port_is_debug_source(port)
+
#define tcpm_port_is_audio(port) \
(tcpm_cc_is_audio((port)->cc1) && tcpm_cc_is_audio((port)->cc2))
@@ -3095,7 +3098,7 @@ static void run_state_machine(struct tcpm_port *port)
tcpm_set_state(port, SNK_UNATTACHED, PD_T_DRP_SNK);
break;
case SRC_ATTACH_WAIT:
- if (tcpm_port_is_debug(port))
+ if (tcpm_port_is_debug_source(port))
tcpm_set_state(port, DEBUG_ACC_ATTACHED,
PD_T_CC_DEBOUNCE);
else if (tcpm_port_is_audio(port))
@@ -3918,7 +3921,7 @@ static void _tcpm_cc_change(struct tcpm_port *port, enum typec_cc_status cc1,
switch (port->state) {
case TOGGLING:
- if (tcpm_port_is_debug(port) || tcpm_port_is_audio(port) ||
+ if (tcpm_port_is_debug_source(port) || tcpm_port_is_audio(port) ||
tcpm_port_is_source(port))
tcpm_set_state(port, SRC_ATTACH_WAIT, 0);
else if (tcpm_port_is_sink(port))
@@ -3926,7 +3929,7 @@ static void _tcpm_cc_change(struct tcpm_port *port, enum typec_cc_status cc1,
break;
case SRC_UNATTACHED:
case ACC_UNATTACHED:
- if (tcpm_port_is_debug(port) || tcpm_port_is_audio(port) ||
+ if (tcpm_port_is_debug_source(port) || tcpm_port_is_audio(port) ||
tcpm_port_is_source(port))
tcpm_set_state(port, SRC_ATTACH_WAIT, 0);
break;
--
2.53.0
^ permalink raw reply related [flat|nested] 3+ messages in thread
* [PATCH 5.10.y 2/2] usb: typec: tcpm: constrain TCPM_SOURCING_VBUS event handling
2026-09-10 11:08 ` [PATCH 5.10.y 1/2] usb: typec: tcpm: fix debug accessory mode detection for sink ports Sasha Levin
@ 2026-09-10 11:08 ` Sasha Levin
0 siblings, 0 replies; 3+ messages in thread
From: Sasha Levin @ 2026-09-10 11:08 UTC (permalink / raw)
To: stable
Cc: Amit Sunil Dhamne, stable, Badhri Jagan Sridharan,
Heikki Krogerus, Greg Kroah-Hartman, Sasha Levin
From: Amit Sunil Dhamne <amitsd@google.com>
[ Upstream commit cd3b9cea675bbfebc223f007dc2f4e79524fa54c ]
When a sink detach occurs while waiting for TX send status, the old
TCPM_SOURCING_VBUS event along with TCPM_VBUS_EVENT and TCPM_CC_EVENT
can be queued in port->pd_events. Because TCPM_SOURCING_VBUS is
evaluated after TCPM_VBUS_EVENT and TCPM_CC_EVENT in
tcpm_pd_event_handler(), a stale TCPM_SOURCING_VBUS event can override
the detach handling and incorrectly set port->vbus_source and
port->vbus_present to true.
Add a state guard to check that the port is either operating as a
Source (tcpm_port_is_source(port)) or in a Fast Role Swap (FRS) state
up to FR_SWAP_SNK_SRC_SOURCE_VBUS_APPLIED before processing
TCPM_SOURCING_VBUS. Otherwise, discard and log the event.
Log snippet for error condition before fix:
[72792.204955] state change SRC_ATTACHED -> SRC_STARTUP [rev3 NONE_AMS]
[72792.204960] sourcing vbus
[72792.204962] VBUS on
[72792.204970] AMS POWER_NEGOTIATION start
[72792.204974] cc:=4
[72792.205319] state change SRC_STARTUP -> AMS_START [rev3 POWER_NEGOTIATION]
[72792.205325] state change AMS_START -> SRC_SEND_CAPABILITIES [rev3 POWER_NEGOTIATION]
[72792.205332] PD TX, header: 0x11a1
[72792.216911] PD TX complete, status: 2
[72792.216957] pending state change SRC_SEND_CAPABILITIES -> SRC_SEND_CAPABILITIES @ 150 ms [rev3 POWER_NEGOTIATION]
[72792.218005] VBUS off
[72792.218013] pending state change SRC_SEND_CAPABILITIES -> SNK_UNATTACHED @ 650 ms [rev3 POWER_NEGOTIATION]
[72792.218020] VBUS VSAFE0V
[72792.218024] state change SRC_SEND_CAPABILITIES -> SNK_UNATTACHED [rev3 POWER_NEGOTIATION]
[72792.218458] CC1: 2 -> 0, CC2: 0 -> 0 [state SNK_UNATTACHED, polarity 0, disconnected]
[72792.218467] VBUS on --> VBUS left on
[72792.218980] disable vbus discharge ret:0
[72792.235193] Start toggling
After fix:
[ 1195.291691] state change SRC_ATTACHED -> SRC_STARTUP [rev3 NONE_AMS]
[ 1195.291698] sourcing vbus
[ 1195.291700] VBUS on
[ 1195.291707] AMS POWER_NEGOTIATION start
[ 1195.291710] cc:=4
[ 1195.291758] state change SRC_STARTUP -> AMS_START [rev3 POWER_NEGOTIATION]
[ 1195.291794] state change AMS_START -> SRC_SEND_CAPABILITIES [rev3 POWER_NEGOTIATION]
[ 1195.291798] PD TX, header: 0x11a1
[ 1195.297056] PD TX complete, status: 2
[ 1195.297092] pending state change SRC_SEND_CAPABILITIES -> SRC_SEND_CAPABILITIES @ 150 ms [rev3 POWER_NEGOTIATION]
[ 1195.297177] VBUS off
[ 1195.297184] pending state change SRC_SEND_CAPABILITIES -> SNK_UNATTACHED @ 650 ms [rev3 POWER_NEGOTIATION]
[ 1195.297227] CC1: 2 -> 0, CC2: 0 -> 0 [state SRC_SEND_CAPABILITIES, polarity 0, disconnected]
[ 1195.307469] cc:=2
[ 1195.307544] pending state change SRC_SEND_CAPABILITIES -> SNK_UNATTACHED @ 650 ms [rev3 POWER_NEGOTIATION]
[ 1195.307555] Discarding sourcing vbus! Invalid state SRC_SEND_CAPABILITIES
[ 1195.957636] state change SRC_SEND_CAPABILITIES -> SNK_UNATTACHED [delayed 650 ms]
[ 1195.957732] disable vbus discharge ret:0
[ 1195.970196] Start toggling
[ 1195.970468] VBUS off
[ 1196.051637] VBUS off
[ 1196.051642] VBUS VSAFE0V
Fixes: 8dc4bd073663 ("usb: typec: tcpm: Add support for Sink Fast Role SWAP(FRS)")
Cc: stable <stable@kernel.org>
Assisted-by: Gemini:gemini-3.1-pro
Signed-off-by: Amit Sunil Dhamne <amitsd@google.com>
Reviewed-by: Badhri Jagan Sridharan <badhri@google.com>
Acked-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Link: https://patch.msgid.link/20260827-sourcing-vbus-v1-1-9be1aca991a0@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
[ Removed the unavailable AMS_START/upcoming_state check to match the direct transition to FR_SWAP_SEND. ]
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/usb/typec/tcpm/tcpm.c | 26 ++++++++++++++++++++------
1 file changed, 20 insertions(+), 6 deletions(-)
diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
index 5cd39ad963e1c..32ad7124cae1f 100644
--- a/drivers/usb/typec/tcpm/tcpm.c
+++ b/drivers/usb/typec/tcpm/tcpm.c
@@ -4287,16 +4287,30 @@ static void tcpm_pd_event_handler(struct kthread_work *work)
tcpm_log(port, "Discarding FRS_SIGNAL! Not in sink ready");
}
if (events & TCPM_SOURCING_VBUS) {
- tcpm_log(port, "sourcing vbus");
/*
* In fast role swap case TCPC autonomously sources vbus. Set vbus_source
- * true as TCPM wouldn't have called tcpm_set_vbus.
+ * true conditionally as TCPM wouldn't have called tcpm_set_vbus.
+ * If TCPM calls tcpm_set_vbus to source vbus, vbus_source would already
+ * be true.
*
- * When vbus is sourced on the command on TCPM i.e. TCPM called
- * tcpm_set_vbus to source vbus, vbus_source would already be true.
+ * When TCPM_FRS_EVENT and TCPM_SOURCING_VBUS arrive simultaneously,
+ * handling TCPM_FRS_EVENT above transitions the state to FR_SWAP_SEND.
*/
- port->vbus_source = true;
- _tcpm_pd_vbus_on(port);
+
+ if (tcpm_port_is_source(port) ||
+ tcpm_port_is_debug_source(port) ||
+ port->state == FR_SWAP_SEND ||
+ port->state == FR_SWAP_SEND_TIMEOUT ||
+ port->state == FR_SWAP_SNK_SRC_TRANSITION_TO_OFF ||
+ port->state == FR_SWAP_SNK_SRC_NEW_SINK_READY ||
+ port->state == FR_SWAP_SNK_SRC_SOURCE_VBUS_APPLIED) {
+ tcpm_log(port, "sourcing vbus");
+ port->vbus_source = true;
+ _tcpm_pd_vbus_on(port);
+ } else {
+ tcpm_log(port, "Discarding sourcing vbus! Invalid state %s",
+ tcpm_states[port->state]);
+ }
}
spin_lock(&port->pd_event_lock);
--
2.53.0
^ permalink raw reply related [flat|nested] 3+ messages in thread
end of thread, other threads:[~2026-09-10 11:08 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz follow: Atom feed
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2026-09-08 12:29 FAILED: patch "[PATCH] usb: typec: tcpm: constrain TCPM_SOURCING_VBUS event handling" failed to apply to 5.10-stable tree gregkh
2026-09-10 11:08 ` [PATCH 5.10.y 1/2] usb: typec: tcpm: fix debug accessory mode detection for sink ports Sasha Levin
2026-09-10 11:08 ` [PATCH 5.10.y 2/2] usb: typec: tcpm: constrain TCPM_SOURCING_VBUS event handling Sasha Levin
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