From patchwork Thu Jul 14 14:31:07 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Krishna Kurapati X-Patchwork-Id: 12918074 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 1EA8BCCA47B for ; Thu, 14 Jul 2022 14:56:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229523AbiGNO4V (ORCPT ); Thu, 14 Jul 2022 10:56:21 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33854 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238743AbiGNO4T (ORCPT ); Thu, 14 Jul 2022 10:56:19 -0400 X-Greylist: delayed 1487 seconds by postgrey-1.37 at lindbergh.monkeyblade.net; Thu, 14 Jul 2022 07:56:19 PDT Received: from mx0b-0031df01.pphosted.com (mx0b-0031df01.pphosted.com [205.220.180.131]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 33EDF5C369; Thu, 14 Jul 2022 07:56:19 -0700 (PDT) Received: from pps.filterd (m0279873.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.17.1.5/8.17.1.5) with ESMTP id 26EBFpls031152; Thu, 14 Jul 2022 14:31:24 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; h=from : to : cc : subject : date : message-id : mime-version : content-type; s=qcppdkim1; bh=f7RaRgDoZZGQ1vuyDsPSY35GCbn3E4x7n2cFx773AbU=; b=hPFEFLXgOWebDJdlCkAGDRrohGCls/EdZo51pwO5FHsUtf5F+V+3DE9wZ++75NrbqwvQ dOtR7rUal82ygv/5s2syx/Phe1fygKYse/nr05XwoKJ8JMmQtidDlK8Ia88tr+ikocM4 laqrp2SXDzx4tvwO87YMFrznweJTN4j/E6Z3eoqjDPV66o/d+nDutGsECvnYEBDyPKGg PJe3ecaVkRT8u8MH+VxkCptXHwgLK2Jmj0mjnf1jbAZVhvhqxUqngklk7cvmAukgjgod aBJZH7e22aJCbEArKudn1Qtx9trMhdcCDwCH5emrcu8c5wj0A6+MeyLzfKLBHUSJEuS0 4A== Received: from nasanppmta02.qualcomm.com (i-global254.qualcomm.com [199.106.103.254]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 3habdxhen5-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 14 Jul 2022 14:31:24 +0000 Received: from nasanex01c.na.qualcomm.com (nasanex01c.na.qualcomm.com [10.47.97.222]) by NASANPPMTA02.qualcomm.com (8.17.1.5/8.17.1.5) with ESMTPS id 26EEVNpL000573 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 14 Jul 2022 14:31:23 GMT Received: from nalasex01a.na.qualcomm.com (10.47.209.196) by nasanex01c.na.qualcomm.com (10.47.97.222) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.986.22; Thu, 14 Jul 2022 07:31:23 -0700 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 15.2.986.22; Thu, 14 Jul 2022 07:31:20 -0700 From: Krishna Kurapati To: Andy Gross , Bjorn Andersson , Felipe Balbi , "Greg Kroah-Hartman" , Philipp Zabel CC: , , , Krishna Kurapati Subject: [PATCH] usb: dwc3: qcom: Defer dwc3-qcom probe if dwc3 isn't probed properly Date: Thu, 14 Jul 2022 20:01:07 +0530 Message-ID: <1657809067-25815-1-git-send-email-quic_kriskura@quicinc.com> X-Mailer: git-send-email 2.7.4 MIME-Version: 1.0 X-Originating-IP: [10.80.80.8] X-ClientProxiedBy: nasanex01b.na.qualcomm.com (10.46.141.250) To nalasex01a.na.qualcomm.com (10.47.209.196) X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-ORIG-GUID: NTHbb-mJtXegfmadFR-BxpUZlypN0hJH X-Proofpoint-GUID: NTHbb-mJtXegfmadFR-BxpUZlypN0hJH X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.883,Hydra:6.0.517,FMLib:17.11.122.1 definitions=2022-07-14_10,2022-07-14_01,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 priorityscore=1501 bulkscore=0 mlxlogscore=999 clxscore=1011 phishscore=0 adultscore=0 mlxscore=0 malwarescore=0 impostorscore=0 spamscore=0 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2206140000 definitions=main-2207140061 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org On SC7180 devices, it is observed that dwc3 probing is deferred because device_links_check_suppliers() finds that '88e3000.phy' isn't ready yet. As a part of its probe call, dwc3-qcom driver checks if dwc3 core is wakeup capable or not. If the dwc3 core is wakeup capable, driver configures dwc-qcom's power domain to be always ON. Also it configures dp/dm interrupts accordingly to support wakeup from system suspend. More info regarding the same can be found at: commit d9be8d5c5b03 ("usb: dwc3: qcom: Keep power domain on to retain controller status" commit 6895ea55c385 ("usb: dwc3: qcom: Configure wakeup interrupts during suspend") In the event, dwc3 probe gets deferred and is processed after dwc3-qcom probe, driver ends up reading the wakeup capability of dwc3 core as false leading to instability in suspend/resume path. To avoid this scenario, ensure dwc3_probe is successful by checking if appropriate driver is assigned to it or not after the of_platform_populate call. If it isn't then defer dwc3-qcom probe as well. Signed-off-by: Krishna Kurapati --- drivers/usb/dwc3/dwc3-qcom.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/usb/dwc3/dwc3-qcom.c b/drivers/usb/dwc3/dwc3-qcom.c index 7703655..096d1414 100644 --- a/drivers/usb/dwc3/dwc3-qcom.c +++ b/drivers/usb/dwc3/dwc3-qcom.c @@ -722,6 +722,9 @@ static int dwc3_qcom_of_register_core(struct platform_device *pdev) dev_err(dev, "failed to get dwc3 platform device\n"); } + if (!qcom->dwc3->dev.driver) + return -EPROBE_DEFER; + node_put: of_node_put(dwc3_np);