From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B549D53A890 for ; Tue, 8 Sep 2026 12:30:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788870603; cv=none; b=Iifg70VcOmRKqKo0VW1HpHcF8ff/AEklAMW1D+jrw8P7/RsZbHdx06bKtlPVMi5gWqmk51lr2bkVDzRbgsLRiFOUQGi3nIhQlxOIUo0ZBXXB4AZjDGTNAOQ6Np+pkiGKYJWlLWrtZjQ+h4EhATHHpY68Nt0Cy7okjQg3MrXX1cQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788870603; c=relaxed/simple; bh=YsJ22YXtI+H3M2pSm9XXcWf5AFt3bB3hJayUWzY4X5A=; h=Subject:To:Cc:From:Date:Message-ID:MIME-Version:Content-Type; b=L8aizBehRypWDyubZ+GOnJK9EBvVpJiBJdbG7Ji4OBrtyju1XflVDb63FL3ZpMV8jRq5brmr2r0ffecYpcLtksykW6zpe7hNYHURQUB11K+ZgRYcxW2n5+7tdHZ443YXsocyyqw1utKDYwt5pNSNFVa29LESqSDFtoAnvqaIeBk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=nuVOPyO9; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="nuVOPyO9" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E6D5E1F00A3A; Tue, 8 Sep 2026 12:30:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1788870601; bh=PY5la2+QXNNDHw98rIlvElwOqpalU53znTULxwSWbzo=; h=Subject:To:Cc:From:Date; b=nuVOPyO9DPeljbKWEaZn3phJq+AZltmWcBdzFUzkgFykYz9eL+FPveF3f4I8Il5GD tBi90ZFOMe1l58izx+bPAXDejF5KTi5ZV+AAA0J2s3HgrFQEUEZDAbO1DkttonhJ8C DX1Tq2AwHEX91ctcIvMP3Q4Zmq7BO4s1g5jLXeWQ= Subject: FAILED: patch "[PATCH] usb: typec: tcpm: constrain TCPM_SOURCING_VBUS event handling" failed to apply to 5.15-stable tree To: amitsd@google.com,badhri@google.com,gregkh@linuxfoundation.org,heikki.krogerus@linux.intel.com,stable@kernel.org Cc: From: Date: Tue, 08 Sep 2026 14:29:03 +0200 Message-ID: <2026090803-mandolin-semantic-dfec@gregkh> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit The patch below does not apply to the 5.15-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 . 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-5.15.y git checkout FETCH_HEAD git cherry-pick -x cd3b9cea675bbfebc223f007dc2f4e79524fa54c # git commit -s git send-email --to '' --in-reply-to '2026090803-mandolin-semantic-dfec@gregkh' --subject-prefix 'PATCH 5.15.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 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 Assisted-by: Gemini:gemini-3.1-pro Signed-off-by: Amit Sunil Dhamne Reviewed-by: Badhri Jagan Sridharan Acked-by: Heikki Krogerus Link: https://patch.msgid.link/20260827-sourcing-vbus-v1-1-9be1aca991a0@google.com Signed-off-by: Greg Kroah-Hartman 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");