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[2620:137:e000::1:20]) by mx.google.com with ESMTP id dm3-20020a170907948300b007c171bf2316si9816392ejc.634.2022.12.15.01.33.17; Thu, 15 Dec 2022 01:33:41 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com header.s=20210112 header.b=Z8ftD08M; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229925AbiLOJWD (ORCPT + 99 others); Thu, 15 Dec 2022 04:22:03 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59672 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229947AbiLOJV7 (ORCPT ); Thu, 15 Dec 2022 04:21:59 -0500 Received: from mail-pl1-x631.google.com (mail-pl1-x631.google.com [IPv6:2607:f8b0:4864:20::631]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2E36CCD6; Thu, 15 Dec 2022 01:21:55 -0800 (PST) Received: by mail-pl1-x631.google.com with SMTP id g10so6189237plo.11; Thu, 15 Dec 2022 01:21:55 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=tKq+74lFzjG0ld+n/1zNhWFFCw+s5cZPvJZHWPcwlfs=; b=Z8ftD08MnvO6lYokc6C0FaaznWFY7oZ2o88H4jjh1XTIGX6LCllsoCoAxrA/N8wBug UTR2e/IWhyja/+QvOSxfe8qeW/TykJjcGxshfabALZTM0BPoTQ994q6LWQhnDU5bWH7M dQWeF7BF5wj3Ye0QzJIrUbhazEzJXRvTPtEkPz1WFFq1Tzsz0vibXrETarxlClMVtlBk eGJUNgHRgFszz48swWN2wMgNypMj3VWBODgPMWoH4YzOJC4EVQl/Z4IbC2dRp1o0vAV6 kwi54D/CUUdcx4EBco/m5r+z9lDAuOKrsjh7yC51H23U8y3vhBwXVAQkxmt1Ynn6nupS 9dYw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=tKq+74lFzjG0ld+n/1zNhWFFCw+s5cZPvJZHWPcwlfs=; b=uqQuLsS8gFcaO46Wz/k6ogXjcOGnM+dXnqYwzosCvDGJxe9OTOQUP6sXXH3zJtulII zbMPdncdFCDN25MsgZXWVMkFJFtrRQuWhDxDMIaKB4UNq6gXkDZSxLygMv3gYoPdcc9L A+f+lKtw+bEPmu4u36kvmft9VnBti3Bs4Gh0bqpi16/HX8w03kIAL4iUpXwrHhgNkrQS AlM6dAs7h9COJZR+el/23yOFgCSiQxEIpxBwgRd+P+DPkiX5xmZH2NrSIapwmmHI+pjL uk/FlKDV/plhZ8eS0EcU2m4x42SrPVfVtmH/gXOHlRAbWTcMjSVTnObiU1EyTKxbP4L9 syLA== X-Gm-Message-State: ANoB5pkd3DwV5i0xEo8e7xPmb76wt2lTiB1gK50xozFW3LLqOglwsFax nOHJbAvuBKMkW1IrLRpRdaA= X-Received: by 2002:a17:902:f610:b0:185:441e:2349 with SMTP id n16-20020a170902f61000b00185441e2349mr31031911plg.63.1671096114339; Thu, 15 Dec 2022 01:21:54 -0800 (PST) Received: from localhost.localdomain ([2402:7500:486:1c9c:f86e:3e0f:1a37:f7a5]) by smtp.gmail.com with ESMTPSA id k13-20020a170902c40d00b0017a032d7ae4sm3334796plk.104.2022.12.15.01.21.49 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Thu, 15 Dec 2022 01:21:53 -0800 (PST) From: cy_huang To: linux@roeck-us.net, heikki.krogerus@linux.intel.com, matthias.bgg@gmail.com Cc: gregkh@linuxfoundation.org, tommyyl.chen@mediatek.com, macpaul.lin@mediatek.com, gene_chen@richtek.com, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, ChiYuan Huang , stable@vger.kernel.org Subject: [PATCH] usb: typec: tcpm: Fix altmode re-registration causes sysfs create fail Date: Thu, 15 Dec 2022 17:21:36 +0800 Message-Id: <1671096096-20307-1-git-send-email-u0084500@gmail.com> X-Mailer: git-send-email 2.7.4 X-Spam-Status: No, score=-1.8 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_ENVFROM_END_DIGIT, FREEMAIL_FROM,RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1752272020748846215?= X-GMAIL-MSGID: =?utf-8?q?1752272020748846215?= From: ChiYuan Huang There's the altmode re-registeration issue after data role swap (DR_SWAP). Comparing to USBPD 2.0, in USBPD 3.0, it loose the limit that only DFP can initiate the VDM command to get partner identity information. For a USBPD 3.0 UFP device, it may already get the identity information from its port partner before DR_SWAP. If DR_SWAP send or receive at the mean time, 'send_discover' flag will be raised again. It causes discover identify action restart while entering ready state. And after all discover actions are done, the 'tcpm_register_altmodes' will be called. If old altmode is not unregistered, this sysfs create fail can be found. In 'DR_SWAP_CHANGE_DR' state case, only DFP will unregister altmodes. For UFP, the original altmodes keep registered. This patch fix the logic that after DR_SWAP, 'tcpm_unregister_altmodes' must be called whatever the current data role is. Fixes: ae8a2ca8a221 ("usb: typec: Group all TCPCI/TCPM code together) Reported-by: TommyYl Chen Cc: stable@vger.kernel.org Signed-off-by: ChiYuan Huang Reviewed-by: Macpaul Lin --- Hi, Below's the issue log for the reference. *TCPM [ 3.856679] AMS DISCOVER_MODES start [ 3.856687] PD TX, header: 0x188f [ 3.858827] PD TX complete, status: 0 [ 3.865330] PD RX, header: 0x2daf [1] [ 3.865340] Rx VDM cmd 0xff01a043 type 1 cmd 3 len 2 [ 3.865348] AMS DISCOVER_MODES finished [ 3.865352] Alternate mode 0: SVID 0xff01, VDO 1: 0x001c0045 [ 3.865362] AMS DISCOVER_MODES start [ 3.865367] PD TX, header: 0x1a8f [ 3.867802] PD TX complete, status: 0 [ 3.875208] PD RX, header: 0x2faf [1] [ 3.875216] Rx VDM cmd 0x413ca043 type 1 cmd 3 len 2 [ 3.875222] AMS DISCOVER_MODES finished [ 3.875225] Alternate mode 1: SVID 0x413c, VDO 1: 0x00000001 [ 3.938243] AMS GET_SINK_CAPABILITIES start [ 3.938255] state change SNK_READY -> AMS_START [rev3 GET_SINK_CAPABILITIES] [ 3.938266] state change AMS_START -> GET_SINK_CAP [rev3 GET_SINK_CAPABILITIES] [ 3.938274] PD TX, header: 0xe88 [ 3.940268] PD TX complete, status: 0 [ 3.940310] pending state change GET_SINK_CAP -> GET_SINK_CAP_TIMEOUT @ 60 ms [rev3 GET_SINK_CAPABILITIES] [ 3.946291] PD RX, header: 0x13a4 [1] [ 3.946295] Port partner FRS capable partner_frs_current:0 port_frs_current:0 enable:n [ 3.946298] state change GET_SINK_CAP -> SNK_READY [rev3 GET_SINK_CAPABILITIES] [ 3.946304] AMS GET_SINK_CAPABILITIES finished [ 4.239342] CC1: 5 -> 4, CC2: 0 -> 0 [state SNK_READY, polarity 0, connected] [ 4.256594] PD RX, header: 0x5a9 [1] [ 4.256603] state change SNK_READY -> DR_SWAP_ACCEPT [rev3 DATA_ROLE_SWAP] [ 4.256609] PD TX, header: 0x83 [ 4.258528] PD TX complete, status: 0 [ 4.258584] state change DR_SWAP_ACCEPT -> DR_SWAP_CHANGE_DR [rev3 DATA_ROLE_SWAP] [ 4.258591] Requesting mux state 1, usb-role 1, orientation 1 [ 4.259588] AMS DATA_ROLE_SWAP finished [ 4.259592] state change DR_SWAP_CHANGE_DR -> SNK_READY [rev3 NONE_AMS] [ 4.259605] AMS DISCOVER_IDENTITY start [ 4.259609] Sink TX No Go [ 4.260874] CC1: 4 -> 5, CC2: 0 -> 0 [state SNK_READY, polarity 0, connected] [ 4.359636] AMS DISCOVER_IDENTITY start [ 4.359642] PD TX, header: 0x12af [ 4.361884] PD TX complete, status: 0 [ 4.369433] PD RX, header: 0x578f [1] [ 4.369439] Rx VDM cmd 0xff00a041 type 1 cmd 1 len 5 [ 4.369448] AMS DISCOVER_IDENTITY finished [ 4.369515] Identity: 413c:c013.0712 [ 4.369521] AMS DISCOVER_SVIDS start [ 4.369524] PD TX, header: 0x14af [ 4.371696] PD TX complete, status: 0 [ 4.378564] PD RX, header: 0x398f [1] [ 4.378573] Rx VDM cmd 0xff00a042 type 1 cmd 2 len 3 [ 4.378579] AMS DISCOVER_SVIDS finished [ 4.378582] SVID 1: 0xff01 [ 4.378584] SVID 2: 0x413c [ 4.378594] AMS DISCOVER_MODES start [ 4.378597] PD TX, header: 0x16af [ 4.380696] PD TX complete, status: 0 [ 4.387008] PD RX, header: 0x2b8f [1] [ 4.387014] Rx VDM cmd 0xff01a043 type 1 cmd 3 len 2 [ 4.387021] AMS DISCOVER_MODES finished [ 4.387023] Alternate mode 0: SVID 0xff01, VDO 1: 0x001c0045 [ 4.387029] AMS DISCOVER_MODES start [ 4.387031] PD TX, header: 0x18af [ 4.389134] PD TX complete, status: 0 [ 4.395528] PD RX, header: 0x2d8f [1] [ 4.395538] Rx VDM cmd 0x413ca043 type 1 cmd 3 len 2 [ 4.395546] AMS DISCOVER_MODES finished [ 4.395548] Alternate mode 1: SVID 0x413c, VDO 1: 0x00000001 *Kernel TRACE sysfs: cannot create duplicate filename '/devices/platform/soc/11d01000.i2c/i2c-0/0-0034/mt6360-tcpc.6.auto/typec/port0/port0.0/partner' CPU: 2 PID: 299 Comm: mt6360-tcpc.6.a Tainted: GO 5.15.37-mtk+g880abc5122e7 #1 Hardware name: MediaTek MT8195 demo board (DT) Call trace: dump_backtrace+0x0/0x1ac show_stack+0x24/0x30 dump_stack_lvl+0x68/0x84 dump_stack+0x1c/0x38 sysfs_warn_dup+0x70/0x90 typec_probe+0xa4/0x134 [typec] really_probe.part.0+0xa4/0x310 __device_attach_driver+0x100/0x16c bus_for_each_drv+0x84/0xe0 __device_attach+0xe0/0x1ac device_add+0x39c/0x8b0 device_register+0x2c/0x40 typec_register_altmode+0x1f4/0x360 [typec] typec_partner_register_altmode+0x1c/0x30 [typec] tcpm_pd_rx_handler+0x19d4/0x1c0c [tcpm] kthread_worker_fn+0xb8/0x290 kthread+0x15c/0x170 ret_from_fork+0x10/0x20 [ 4.395962] typec_displayport port0-partner.2: failed to create symlinks [ 4.395967] typec_displayport: probe of port0-partner.2 failed with error -17 It seems it's a common issue if typec port supports the modal operation. --- drivers/usb/typec/tcpm/tcpm.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c index 904c7b4..59b366b 100644 --- a/drivers/usb/typec/tcpm/tcpm.c +++ b/drivers/usb/typec/tcpm/tcpm.c @@ -4594,14 +4594,13 @@ static void run_state_machine(struct tcpm_port *port) tcpm_set_state(port, ready_state(port), 0); break; case DR_SWAP_CHANGE_DR: - if (port->data_role == TYPEC_HOST) { - tcpm_unregister_altmodes(port); + tcpm_unregister_altmodes(port); + if (port->data_role == TYPEC_HOST) tcpm_set_roles(port, true, port->pwr_role, TYPEC_DEVICE); - } else { + else tcpm_set_roles(port, true, port->pwr_role, TYPEC_HOST); - } tcpm_ams_finish(port); tcpm_set_state(port, ready_state(port), 0); break;