From patchwork Tue Oct 17 13:18:51 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Krishna Kurapati X-Patchwork-Id: 13425163 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 2325FCDB474 for ; Tue, 17 Oct 2023 13:20:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1343982AbjJQNUG (ORCPT ); Tue, 17 Oct 2023 09:20:06 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40790 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1344011AbjJQNT5 (ORCPT ); Tue, 17 Oct 2023 09:19:57 -0400 Received: from mx0a-0031df01.pphosted.com (mx0a-0031df01.pphosted.com [205.220.168.131]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id ACAC9198; Tue, 17 Oct 2023 06:19:50 -0700 (PDT) Received: from pps.filterd (m0279863.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 39HCiLAE029249; Tue, 17 Oct 2023 13:19:43 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding : content-type; s=qcppdkim1; bh=AlcgEQhkV+CHWGIIVMx9+hfGbBgrSjeMLC+vJ2luDV4=; b=hTtTMYMp2TLd/LsJrkqlcYy18gI9gDFly+1vM9OonK4kLHsTlF6H1b0dPbkdNGyG0Nf6 soj7OsdcKxoLb/bhoy/OJGsKtbuiobQ2Cdpgk8dqN8AAHo9EVuHtVKcgOGdc2mTqQ/Zy 4N07/1cDfKTsQ9GYm3EytZmo35UdggUijspNLtVvJ9Rc+9+8pKwbWkEQLm0uLq0iDnLR 1dYQoVirWbNnU710ErIy08U5xvgKzPI0rXUEZbgM6KWM1/k3A+r+FtCE4C6WMN/JSeg5 ZHyFUhXNK8FFiJRld0eJiZYsEGk7ua+evQPdFdyGyoHLT5BWpSnDsrLunVs7O3xXtljt 2A== Received: from nalasppmta01.qualcomm.com (Global_NAT1.qualcomm.com [129.46.96.20]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 3tsnearqfy-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 17 Oct 2023 13:19:43 +0000 Received: from nalasex01a.na.qualcomm.com (nalasex01a.na.qualcomm.com [10.47.209.196]) by NALASPPMTA01.qualcomm.com (8.17.1.5/8.17.1.5) with ESMTPS id 39HDJffC031191 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 17 Oct 2023 13:19:41 GMT Received: from hu-kriskura-hyd.qualcomm.com (10.80.80.8) by nalasex01a.na.qualcomm.com (10.47.209.196) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.39; Tue, 17 Oct 2023 06:19:37 -0700 From: Krishna Kurapati To: Thinh Nguyen , Greg Kroah-Hartman , Philipp Zabel , "Andy Gross" , Bjorn Andersson , "Konrad Dybcio" , Rob Herring , Krzysztof Kozlowski , Conor Dooley , CC: , , , , , , Krishna Kurapati Subject: [RFC 8/8] usb: dwc3: core: Skip set_mode notification if cable is disconnected Date: Tue, 17 Oct 2023 18:48:51 +0530 Message-ID: <20231017131851.8299-8-quic_kriskura@quicinc.com> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20231017131851.8299-1-quic_kriskura@quicinc.com> References: <20231017131851.8299-1-quic_kriskura@quicinc.com> MIME-Version: 1.0 X-Originating-IP: [10.80.80.8] X-ClientProxiedBy: nasanex01a.na.qualcomm.com (10.52.223.231) To nalasex01a.na.qualcomm.com (10.47.209.196) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-GUID: nbexWgWYIv3y0j0BHEC-vxIxYccZY9hc X-Proofpoint-ORIG-GUID: nbexWgWYIv3y0j0BHEC-vxIxYccZY9hc X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.980,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2023-10-17_02,2023-10-17_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 adultscore=0 phishscore=0 impostorscore=0 malwarescore=0 spamscore=0 mlxlogscore=999 priorityscore=1501 clxscore=1015 mlxscore=0 suspectscore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2309180000 definitions=main-2310170113 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org In device mode use cases, the following sequence of actions are observed: 1. Cable disconnect happens and clears qscratch HS_PHY_CTRL_REG properly 2. Disconnect event is generated and "connected" flag turns false. 3. Then the setmode notification from core goes to glue 4. Glue will set back the qscratch HS_PHY_CTRL_REG bits again. At this point, since the cable is removed, setting qscratch bits shouldn't affect anything. But it is observed that after setting this bits, the controller generated Event-0x101 and Event-0x30601 (bus reset and suspend) in order. In bus reset, we set back the "connected" flag and this blocks suspend again. So send set_mode call only if the cable is connected, else skip it. Signed-off-by: Krishna Kurapati --- drivers/usb/dwc3/core.c | 3 ++- drivers/usb/dwc3/core.h | 2 ++ drivers/usb/dwc3/drd.c | 6 +++++- 3 files changed, 9 insertions(+), 2 deletions(-) diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c index b4d1d1c98dd5..6ef1e3558384 100644 --- a/drivers/usb/dwc3/core.c +++ b/drivers/usb/dwc3/core.c @@ -137,7 +137,8 @@ static void __dwc3_set_mode(struct work_struct *work) if (!desired_dr_role) goto out; - dwc3_notify_set_mode(dwc, desired_dr_role); + if (dwc->cable_disconnected == false) + dwc3_notify_set_mode(dwc, desired_dr_role); if (desired_dr_role == dwc->current_dr_role) goto out; diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h index 5ed7fd5eb776..1b79c407a798 100644 --- a/drivers/usb/dwc3/core.h +++ b/drivers/usb/dwc3/core.h @@ -1365,6 +1365,8 @@ struct dwc3 { void *glue_data; const struct dwc3_glue_ops *glue_ops; + + bool cable_disconnected; }; #define INCRX_BURST_MODE 0 diff --git a/drivers/usb/dwc3/drd.c b/drivers/usb/dwc3/drd.c index 947faeef0e4d..b3a87c40c4f1 100644 --- a/drivers/usb/dwc3/drd.c +++ b/drivers/usb/dwc3/drd.c @@ -446,6 +446,8 @@ static int dwc3_usb_role_switch_set(struct usb_role_switch *sw, struct dwc3 *dwc = usb_role_switch_get_drvdata(sw); u32 mode; + dwc->cable_disconnected = false; + switch (role) { case USB_ROLE_HOST: mode = DWC3_GCTL_PRTCAP_HOST; @@ -467,8 +469,10 @@ static int dwc3_usb_role_switch_set(struct usb_role_switch *sw, * glue needs to know that we are disconnected. It must not notify * the change of mode to default mode. */ - if (role == USB_ROLE_NONE) + if (role == USB_ROLE_NONE) { + dwc->cable_disconnected = true; dwc3_notify_cable_disconnect(dwc); + } dwc3_set_mode(dwc, mode); return 0;