From patchwork Mon Aug 23 22:24:58 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wesley Cheng X-Patchwork-Id: 12453729 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1B61DC4338F for ; Mon, 23 Aug 2021 22:25:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id EBC2261368 for ; Mon, 23 Aug 2021 22:25:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233070AbhHWWZv (ORCPT ); Mon, 23 Aug 2021 18:25:51 -0400 Received: from so254-9.mailgun.net ([198.61.254.9]:38794 "EHLO so254-9.mailgun.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229904AbhHWWZu (ORCPT ); Mon, 23 Aug 2021 18:25:50 -0400 DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1629757507; h=Content-Transfer-Encoding: MIME-Version: Message-Id: Date: Subject: Cc: To: From: Sender; bh=Rj9xzYi66B21+cBLc0upN4YiiQ7vdQ5/M043xNMyNzc=; b=HWHD9puiku1w845BRbq6L2dsZMknkPADOC8czM2dBybrVi96HUCfpwnan/g/Hnxv5tV1R1c8 vmxMKEM8A+VrL9Th1MmY7Winq823hAg1aHKgLrc3q+YJZTrxYJe0l3hAKy411QEa0JXBvUu7 7cgrqWQ5Tpn2r5VyZRNIcGNoMAs= X-Mailgun-Sending-Ip: 198.61.254.9 X-Mailgun-Sid: WyIxZTE2YSIsICJsaW51eC11c2JAdmdlci5rZXJuZWwub3JnIiwgImJlOWU0YSJd Received: from smtp.codeaurora.org (ec2-35-166-182-171.us-west-2.compute.amazonaws.com [35.166.182.171]) by smtp-out-n05.prod.us-east-1.postgun.com with SMTP id 6124203fcd680e8969ef7546 (version=TLS1.2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256); Mon, 23 Aug 2021 22:25:03 GMT Sender: wcheng=codeaurora.org@mg.codeaurora.org Received: by smtp.codeaurora.org (Postfix, from userid 1001) id 92BE3C43460; Mon, 23 Aug 2021 22:25:02 +0000 (UTC) Received: from wcheng-linux.qualcomm.com (i-global254.qualcomm.com [199.106.103.254]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: wcheng) by smtp.codeaurora.org (Postfix) with ESMTPSA id 46D40C4338F; Mon, 23 Aug 2021 22:25:01 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 smtp.codeaurora.org 46D40C4338F Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; spf=fail smtp.mailfrom=codeaurora.org From: Wesley Cheng To: balbi@kernel.org, gregkh@linuxfoundation.org, Thinh.Nguyen@synopsys.com Cc: linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, jackp@codeaurora.org, Wesley Cheng Subject: [PATCH v4] usb: dwc3: gadget: Stop EP0 transfers during pullup disable Date: Mon, 23 Aug 2021 15:24:58 -0700 Message-Id: <20210823222458.3760-1-wcheng@codeaurora.org> X-Mailer: git-send-email 2.33.0 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org During a USB cable disconnect, or soft disconnect scenario, a pending SETUP transaction may not be completed, leading to the following error: dwc3 a600000.dwc3: timed out waiting for SETUP phase If this occurs, then the entire pullup disable routine is skipped and proper cleanup and halting of the controller does not complete. Instead of returning an error (which is ignored from the UDC perspective), allow the pullup disable routine to continue, which will also handle disabling of EP0/1. This will end any active transfers as well. Ensure to clear any delayed_status also, as the timeout could happen within the STATUS stage. Signed-off-by: Wesley Cheng Reviewed-by: Thinh Nguyen --- Changes in v4: - Fixed formatting and typos in commit text - Removed braces due to the removal of the return statement Changes in v3: - Added suggestion by Thinh to change dev_err to dev_warn Changes in v2: - Removed calls to dwc3_ep0_end_control_data() and just allow the ep disables on EP0 handle the proper ending of transfers. - Ensure that delayed_status is cleared, as ran into enumeration issues if the SETUP transaction fails on a STATUS stage. Saw delayed_status == TRUE on the next connect, which blocked further SETUP transactions to be handled. drivers/usb/dwc3/gadget.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c index 5d084542718d..63f6d9f2a692 100644 --- a/drivers/usb/dwc3/gadget.c +++ b/drivers/usb/dwc3/gadget.c @@ -2428,10 +2428,8 @@ static int dwc3_gadget_pullup(struct usb_gadget *g, int is_on) ret = wait_for_completion_timeout(&dwc->ep0_in_setup, msecs_to_jiffies(DWC3_PULL_UP_TIMEOUT)); - if (ret == 0) { - dev_err(dwc->dev, "timed out waiting for SETUP phase\n"); - return -ETIMEDOUT; - } + if (ret == 0) + dev_warn(dwc->dev, "timed out waiting for SETUP phase\n"); } /* @@ -2643,6 +2641,7 @@ static int __dwc3_gadget_start(struct dwc3 *dwc) /* begin to receive SETUP packets */ dwc->ep0state = EP0_SETUP_PHASE; dwc->link_state = DWC3_LINK_STATE_SS_DIS; + dwc->delayed_status = false; dwc3_ep0_out_start(dwc); dwc3_gadget_enable_irq(dwc);