From patchwork Sat Jan 22 01:55:19 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: 534845 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 3BA4FC433F5 for ; Sat, 22 Jan 2022 01:55:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232027AbiAVBza (ORCPT ); Fri, 21 Jan 2022 20:55:30 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57552 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232010AbiAVBz3 (ORCPT ); Fri, 21 Jan 2022 20:55:29 -0500 Received: from mail-yb1-xb4a.google.com (mail-yb1-xb4a.google.com [IPv6:2607:f8b0:4864:20::b4a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 70E82C061401 for ; Fri, 21 Jan 2022 17:55:29 -0800 (PST) Received: by mail-yb1-xb4a.google.com with SMTP id f12-20020a056902038c00b006116df1190aso22654680ybs.20 for ; Fri, 21 Jan 2022 17:55:29 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=date:message-id:mime-version:subject:from:to:cc; bh=w+J03WX3dcYDAp4cPk2KTKsHcLGHwowGZLQnlpzXNlE=; b=R+Q2VH/AcsjDDr+ApptRh7eTbb51+F1grMcFt9Rf2pdd7udJOBFKiNXuHYRPt3vT2H 1nd49QaT08vlGTVFrThrms/tXZAAfFnLlXINYts72GS7vRZbF0d7SRb6KjJvJ1klOijl HxRg8PspMA5IjWvGuSzjL1cW7Uq+o3G8kCTYm4BgymesQPpQ/UN9xlrhS+rV825X38um dIsVF91gbBMe3+0bIY+lXJK4kIuzIFpqtdz1C3zppnfPR9HdaIVZTf+MXsCDdwYgUwKp L59ke7gbbLhsNsCB0/DCCIdA+WuTdGSEi4BAaR2c9DHRJvjdrLqztI1C8Q3L2jqq256y D1Xw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:message-id:mime-version:subject:from:to:cc; bh=w+J03WX3dcYDAp4cPk2KTKsHcLGHwowGZLQnlpzXNlE=; b=kKIXJGj5dzmqpWsLpGCSXCd4jfk7v8IooUVqdxEGhAq9E/5aBFEZ3kYWJhxWKghJei AZhjqfAOE8d4a2z3Tx29qk9NFlUNMJcD65XSMy+bH0s/tIFqQ1/k72LZlXHPEibb9O2u b7qw9bnpew17llL16ftUBvdDyErT/L85j+AKSk86xMezEX+fu0BIuDRQQ9EKAtOaDFt7 U0rSy7mi+4IOHFmw96o+QLgQNmwcn0Rm03fTxWeJ1SKhgPDUE9tu9ra1typcQ7QNUqO0 zprCRwWtOOfBiHeLB2/uDC0ZP+FMKzmmRkgPdJzN99icPZpeWXP6K6PH6tnyKQSLaAkD HEXQ== X-Gm-Message-State: AOAM533Ii9JXLi2miDbiHOoxUauQC/MrN72Hbt8l+ZWY/s11vIWvwcnT yJsPmSigeq1XasdJ9EbA6odDUdpuXtA= X-Google-Smtp-Source: ABdhPJxbMfwag8YhXW+FSnTNUaijX6hQWAmIoRvZruMOQxHrjVZNICee2Trn1oql85aYSyXHs1+59ct8adU= X-Received: from badhri.mtv.corp.google.com ([2620:15c:211:201:e346:6a9d:2ca2:5c1c]) (user=badhri job=sendgmr) by 2002:a0d:d8c8:0:b0:2ca:287c:6beb with SMTP id 00721157ae682-2ca287c6e3bmr07b3.144.1642816527942; Fri, 21 Jan 2022 17:55:27 -0800 (PST) Date: Fri, 21 Jan 2022 17:55:19 -0800 Message-Id: <20220122015520.332507-1-badhri@google.com> Mime-Version: 1.0 X-Mailer: git-send-email 2.35.0.rc0.227.g00780c9af4-goog Subject: [PATCH v1 1/2] usb: typec: tcpm: Do not disconnect while receiving VBUS off 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 before tcpm gets to read port->tcpc->get_vbus. This will will report a VBUS off event causing TCPM to transition to SNK_UNATTACHED where it should be waiting in either SNK_ATTACH_WAIT or SNK_DEBOUNCED state. This patch makes TCPM avoid vbus off 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: f0690a25a140b8 ("staging: typec: USB Type-C Port Manager (tcpm)") Cc: stable@vger.kernel.org Signed-off-by: Badhri Jagan Sridharan Reviewed-by: Guenter Roeck --- drivers/usb/typec/tcpm/tcpm.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c index 59d4fa2443f2..b8afe3d8c882 100644 --- a/drivers/usb/typec/tcpm/tcpm.c +++ b/drivers/usb/typec/tcpm/tcpm.c @@ -5156,7 +5156,8 @@ static void _tcpm_pd_vbus_off(struct tcpm_port *port) case SNK_TRYWAIT_DEBOUNCE: break; case SNK_ATTACH_WAIT: - tcpm_set_state(port, SNK_UNATTACHED, 0); + case SNK_DEBOUNCED: + /* Do nothing, as TCPM is still waiting for vbus to reaach VSAFE5V to connect */ break; case SNK_NEGOTIATE_CAPABILITIES: