From patchwork Wed Mar 1 00:16:57 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kuogee Hsieh X-Patchwork-Id: 13155373 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 60DF1C64EC4 for ; Wed, 1 Mar 2023 00:17:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229492AbjCAARP (ORCPT ); Tue, 28 Feb 2023 19:17:15 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52422 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229445AbjCAARO (ORCPT ); Tue, 28 Feb 2023 19:17:14 -0500 Received: from mx0a-0031df01.pphosted.com (mx0a-0031df01.pphosted.com [205.220.168.131]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C489237714; Tue, 28 Feb 2023 16:17:13 -0800 (PST) Received: from pps.filterd (m0279865.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 31SBVhn7022031; Wed, 1 Mar 2023 00:17:07 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=uxs/uvyaAI1hc8qD6AihJvR3u2BlBnCUjk1sIauZrgw=; b=MbobjVEdPKeH1CeyL/wUyG/rRK04XP3VyCYK7oIM8Ka48CQHTS0tgWExLFcX4T0fCKJo 2Tziuf9Y6Ik4Sbq5uCX/n6ahsEagBz07/HoHGKBvineHG5IS0MhPNIASwO/hWQwAS1Rr NXxKNNQ0DYboepYg5BxRYNaZLm4W7e+S0+0HtfgZ0U5IumbovG3KPw6A3Ymn+mLVgsVX lqHCFR/Nd7P84XCDbSI+UdDkknmafN5IFwpiynWzR3A8CPyKJwcTyi+FupiDhiPtIG2g 2kb3fUQwLPKkf2SrQwbjwHTVktG1rJDio5eoet9hH4uBSwSep/srAs6RYZ+Tzkpgjve2 +w== Received: from nalasppmta05.qualcomm.com (Global_NAT1.qualcomm.com [129.46.96.20]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 3p17ryudje-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 01 Mar 2023 00:17:07 +0000 Received: from nalasex01a.na.qualcomm.com (nalasex01a.na.qualcomm.com [10.47.209.196]) by NALASPPMTA05.qualcomm.com (8.17.1.5/8.17.1.5) with ESMTPS id 3210H6RF004868 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 1 Mar 2023 00:17:06 GMT Received: from khsieh-linux1.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 15.2.986.41; Tue, 28 Feb 2023 16:17:05 -0800 From: Kuogee Hsieh To: , , , , , , , , , CC: , , , , , , Subject: [PATCH v3] drm/msm/dp: check core_initialized flag at both host_init() and host_deinit() Date: Tue, 28 Feb 2023 16:16:57 -0800 Message-ID: <1677629817-18891-1-git-send-email-quic_khsieh@quicinc.com> X-Mailer: git-send-email 2.7.4 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-ORIG-GUID: 15oU2YIR0bst_rnlxMgElXicwas_0Izo X-Proofpoint-GUID: 15oU2YIR0bst_rnlxMgElXicwas_0Izo X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.219,Aquarius:18.0.942,Hydra:6.0.573,FMLib:17.11.170.22 definitions=2023-02-28_19,2023-02-28_03,2023-02-09_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxlogscore=999 lowpriorityscore=0 bulkscore=0 priorityscore=1501 mlxscore=0 phishscore=0 adultscore=0 malwarescore=0 suspectscore=0 clxscore=1015 spamscore=0 impostorscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2212070000 definitions=main-2303010000 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org There is a reboot/suspend test case where system suspend is forced during system booting up. Since dp_display_host_init() of external DP is executed at hpd thread context, this test case may created a scenario that dp_display_host_deinit() from pm_suspend() run before dp_display_host_init() if hpd thread has no chance to run during booting up while suspend request command was issued. At this scenario system will crash at aux register access at dp_display_host_deinit() since aux clock had not yet been enabled by dp_display_host_init(). Therefore we have to ensure aux clock enabled by checking core_initialized flag before access aux registers at pm_suspend. Changes in v2: -- at commit text, dp_display_host_init() instead of host_init() -- at commit text, dp_display_host_deinit() instead of host_deinit() Changes in v3: -- re arrange to avoid commit text line over 75 chars Fixes: 989ebe7bc446 ("drm/msm/dp: do not initialize phy until plugin interrupt received") Signed-off-by: Kuogee Hsieh Reviewed-by: Stephen Boyd --- drivers/gpu/drm/msm/dp/dp_display.c | 20 ++++++++++++-------- 1 file changed, 12 insertions(+), 8 deletions(-) diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c index bde1a7c..1850738 100644 --- a/drivers/gpu/drm/msm/dp/dp_display.c +++ b/drivers/gpu/drm/msm/dp/dp_display.c @@ -460,10 +460,12 @@ static void dp_display_host_init(struct dp_display_private *dp) dp->dp_display.connector_type, dp->core_initialized, dp->phy_initialized); - dp_power_init(dp->power, false); - dp_ctrl_reset_irq_ctrl(dp->ctrl, true); - dp_aux_init(dp->aux); - dp->core_initialized = true; + if (!dp->core_initialized) { + dp_power_init(dp->power, false); + dp_ctrl_reset_irq_ctrl(dp->ctrl, true); + dp_aux_init(dp->aux); + dp->core_initialized = true; + } } static void dp_display_host_deinit(struct dp_display_private *dp) @@ -472,10 +474,12 @@ static void dp_display_host_deinit(struct dp_display_private *dp) dp->dp_display.connector_type, dp->core_initialized, dp->phy_initialized); - dp_ctrl_reset_irq_ctrl(dp->ctrl, false); - dp_aux_deinit(dp->aux); - dp_power_deinit(dp->power); - dp->core_initialized = false; + if (dp->core_initialized) { + dp_ctrl_reset_irq_ctrl(dp->ctrl, false); + dp_aux_deinit(dp->aux); + dp_power_deinit(dp->power); + dp->core_initialized = false; + } } static int dp_display_usbpd_configure_cb(struct device *dev)