From patchwork Wed Jan 26 04:04:46 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: 537082 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 2D225C5DF62 for ; Wed, 26 Jan 2022 04:04:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237436AbiAZEEx (ORCPT ); Tue, 25 Jan 2022 23:04:53 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55422 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233800AbiAZEEw (ORCPT ); Tue, 25 Jan 2022 23:04:52 -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 465E4C06161C for ; Tue, 25 Jan 2022 20:04:52 -0800 (PST) Received: by mail-yb1-xb49.google.com with SMTP id d65-20020a256844000000b00614359972a6so36741714ybc.16 for ; Tue, 25 Jan 2022 20:04:52 -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=QwxLJwmoqd07JuSH9SLqDQX7ullgrCcHXvI+bgIzrTE=; b=lDIeDFzJ80jBeA928G8m+g6sPzt76PBYaMG4kwfZwWmpqXzoO8rlpE9Al9VBhO4d6K 0mA9KeVOktB41epEOvrl6JMuVxG2lq8gJ8H8nxYndsVVF0o+gS5LIz4wxOx0X0pjLZx6 JOdO/+j9TegK2nxxHZ/GFz1hmyUpaLIYsR82jrZmtSj1d+lly5ShCA/npI6LMrvsvjgo JnDaoUzy2D7OB2rCBrpWx0xeGdp2vvoA58MH6LLFzfv0gx/pDj/EYL39EuX4+f5ZTXBV XxUWb5Q/sBxQyYLbuuui8n+7Fvq80ccDM+LpRCTNZ4UGkxJ3M3bcS0J4i2MfSOoavJhB Mddw== 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=QwxLJwmoqd07JuSH9SLqDQX7ullgrCcHXvI+bgIzrTE=; b=nujELVEQQSMJR66eEPGtu/+HVqL9DOG6ywziVNNOiDTUX0m5aKqDdGn3nrMzIlq7pU txlrQFzIV/cDqfxF9Ef+UAruQVI9s8bbUQd1q2vAtbPrem4RhI9icJdo4E4UP8BEPS+d 4AnqcgmlHaMbqn/YWRcR4P8VIsOgLBkJaxv3dHuYKm9Ke/KcZ15iuq/1eX0WvTzXfOv9 0S+1DnBD2uiZgGDRkQFpu4f3Ld3UvEa0I0G0iQBvVKqHAMj1hdmQxhd6z7U6wxXWLNsF NV5mjFcpCCjQHHR6xX7k505Hptza/02ZFqQCsVdUqz1FYLXf9IPTASkYTmByMcnTZJw/ dz1g== X-Gm-Message-State: AOAM533JxxVWFiCn+2L3nqnocOEEwcCFoJAHXr/fswppcWa9wMnqK01c hhJqa+TKM339juhjtaUJTtnBP2Ukn2Q= X-Google-Smtp-Source: ABdhPJwUITrNjvxxgsP8hNxO6pG8m3zBJSqTIPlHqDPOOp0LmmLatYe2TYN1ocTktSm6IrB3QJ5bJKvtUuc= X-Received: from badhri.mtv.corp.google.com ([2620:15c:211:201:f4a7:8e16:f301:160]) (user=badhri job=sendgmr) by 2002:a25:8550:: with SMTP id f16mr32238494ybn.319.1643169891564; Tue, 25 Jan 2022 20:04:51 -0800 (PST) Date: Tue, 25 Jan 2022 20:04:46 -0800 Message-Id: <20220126040447.3186233-1-badhri@google.com> Mime-Version: 1.0 X-Mailer: git-send-email 2.35.0.rc0.227.g00780c9af4-goog Subject: [PATCH v3 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 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 Acked-by: Heikki Krogerus Reviewed-by: Guenter Roeck --- Changes since v1: - Fix typos stated by Guenter Roeck. Changes since v2: - Added reviewed/acked-by tags --- 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..3bf79f52bd34 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 reach VSAFE5V to connect */ break; case SNK_NEGOTIATE_CAPABILITIES: