From patchwork Sat Jan 22 01:55:20 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Badhri Jagan Sridharan X-Patchwork-Id: 534249 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id F1954C433F5 for ; Sat, 22 Jan 2022 01:55:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232039AbiAVBze (ORCPT ); Fri, 21 Jan 2022 20:55:34 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57566 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232045AbiAVBzd (ORCPT ); Fri, 21 Jan 2022 20:55:33 -0500 Received: from mail-yb1-xb49.google.com (mail-yb1-xb49.google.com [IPv6:2607:f8b0:4864:20::b49]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 52AE2C06173B for ; Fri, 21 Jan 2022 17:55:32 -0800 (PST) Received: by mail-yb1-xb49.google.com with SMTP id 2-20020a251302000000b006118f867dadso22790018ybt.12 for ; Fri, 21 Jan 2022 17:55:32 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=BZ3G3fVahBgfvD1PLnJ5plGpaQB8Nz6YDD9CnFxwqWU=; b=aEbW4CX9WQLNRf8TXTJ9ga+wb0n51IyEkBz7WXrYST7gN5mBKYF91qrqGnDzgssZot nEL0UMTIPcqHSf4nSWR7CRctzdJjPqofUx8U5x6nNa1HUZGOZo57D4EmhwGcIjTCaN3w lW1nQe66DTUSHiD5VKgZS6WccVqsRZd7QIULAGjvy0J++NFhUdab7AOuFjz+bDNCdKlx R1HTe/FgHpcdnVS3PpaMpDkjJHR0EQoSQyHNmkWTlWkU1YeiaOhc6ZkBWagDkqor2a+v DWS6atwZf2OM2GycHWSgk7ieIAaWCkqIjgeLBbKW68Oal05mH0A45gkKnBkxC9Yc8eUI /dEw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=BZ3G3fVahBgfvD1PLnJ5plGpaQB8Nz6YDD9CnFxwqWU=; b=qUoqSE3SwmC4ZL4KbSJTN0tddT7vMnMdQcYGH66UskQGSXh7FWoCrnunRD1G6gvcsU DT/C6PqgWZLR7SQ7sFCqRZS3DrL/6ZA6rx6B9/eiKyeJrGUELfgzDIL1lDQsjbzrgFa/ XTbGpRvhOnGgyMiSz5nuaRCFulP8cMhF7/Qec3MOOMAdnj4EL0vxnPrqhYpxDE+vAIdU qmTsfM2+V9B60FqFBTWH4Ck7JyLGFuHhZUe1GqvIefS5VnynT2Q/KDOCCXu5sw5S3xUa ngdf3IjCNbp3mGgXlXB5NDN17f5+m8MRoc1YuAF3AxJGFUArD7T3uX78ngMgelmdlmVu h62w== X-Gm-Message-State: AOAM5333Py+W/bfIki0YO5AA8Q7jNzh1gBaZ0FhLCjvjwfSxapktwjbP 5wVxg2MDx61R+DQ8cI1uOraCr7CE4s8= X-Google-Smtp-Source: ABdhPJxatmGvxKtH2Ij5NF6AJZsNOmRCLZnAsEgBIK9ESq37zb28PEXs1VyvxtWxHoUVP2ow/kbMVnbzGMY= X-Received: from badhri.mtv.corp.google.com ([2620:15c:211:201:e346:6a9d:2ca2:5c1c]) (user=badhri job=sendgmr) by 2002:a0d:c1c3:0:b0:2ca:287c:6b9e with SMTP id 00721157ae682-2ca287c6df0mr27b3.67.1642816531219; Fri, 21 Jan 2022 17:55:31 -0800 (PST) Date: Fri, 21 Jan 2022 17:55:20 -0800 In-Reply-To: <20220122015520.332507-1-badhri@google.com> Message-Id: <20220122015520.332507-2-badhri@google.com> Mime-Version: 1.0 References: <20220122015520.332507-1-badhri@google.com> X-Mailer: git-send-email 2.35.0.rc0.227.g00780c9af4-goog Subject: [PATCH v1 2/2] usb: typec: tcpm: Do not disconnect when receiving VSAFE0V From: Badhri Jagan Sridharan To: Guenter Roeck , Heikki Krogerus , Greg Kroah-Hartman Cc: linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, Kyle Tso , stable@vger.kernel.org, Badhri Jagan Sridharan Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org With some chargers, vbus might momentarily raise above VSAFE5V and fall back to 0V causing VSAFE0V to be triggered. This will will report a VBUS off event causing TCPM to transition to SNK_UNATTACHED state where it should be waiting in either SNK_ATTACH_WAIT or SNK_DEBOUNCED state. This patch makes TCPM avoid VSAFE0V events while in SNK_ATTACH_WAIT or SNK_DEBOUNCED state. Stub from the spec: "4.5.2.2.4.2 Exiting from AttachWait.SNK State A Sink shall transition to Unattached.SNK when the state of both the CC1 and CC2 pins is SNK.Open for at least tPDDebounce. A DRP shall transition to Unattached.SRC when the state of both the CC1 and CC2 pins is SNK.Open for at least tPDDebounce." [23.194131] CC1: 0 -> 0, CC2: 0 -> 5 [state SNK_UNATTACHED, polarity 0, connected] [23.201777] state change SNK_UNATTACHED -> SNK_ATTACH_WAIT [rev3 NONE_AMS] [23.209949] pending state change SNK_ATTACH_WAIT -> SNK_DEBOUNCED @ 170 ms [rev3 NONE_AMS] [23.300579] VBUS off [23.300668] state change SNK_ATTACH_WAIT -> SNK_UNATTACHED [rev3 NONE_AMS] [23.301014] VBUS VSAFE0V [23.301111] Start toggling Fixes: 28b43d3d746b8 ("usb: typec: tcpm: Introduce vsafe0v for vbus") Cc: stable@vger.kernel.org Signed-off-by: Badhri Jagan Sridharan Reviewed-by: Guenter Roeck --- drivers/usb/typec/tcpm/tcpm.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c index b8afe3d8c882..5fce795b69c7 100644 --- a/drivers/usb/typec/tcpm/tcpm.c +++ b/drivers/usb/typec/tcpm/tcpm.c @@ -5264,6 +5264,10 @@ static void _tcpm_pd_vbus_vsafe0v(struct tcpm_port *port) case PR_SWAP_SNK_SRC_SOURCE_ON: /* Do nothing, vsafe0v is expected during transition */ break; + case SNK_ATTACH_WAIT: + case SNK_DEBOUNCED: + /*Do nothing, still waiting for VSAFE5V for connect */ + break; default: if (port->pwr_role == TYPEC_SINK && port->auto_vbus_discharge_enabled) tcpm_set_state(port, SNK_UNATTACHED, 0);