From patchwork Wed Aug 10 19:25:51 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kuogee Hsieh X-Patchwork-Id: 12940925 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 336CFC00140 for ; Wed, 10 Aug 2022 19:26:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230176AbiHJT0P (ORCPT ); Wed, 10 Aug 2022 15:26:15 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56758 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229868AbiHJT0N (ORCPT ); Wed, 10 Aug 2022 15:26:13 -0400 Received: from mx0b-0031df01.pphosted.com (mx0b-0031df01.pphosted.com [205.220.180.131]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 821406A492; Wed, 10 Aug 2022 12:26:12 -0700 (PDT) Received: from pps.filterd (m0279872.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.17.1.5/8.17.1.5) with ESMTP id 27AJ2fAF009454; Wed, 10 Aug 2022 19:26:04 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=QRXN9BzYWPSLiDAJmspLQn15ZiL/h1lw0lJm6a2Ic+k=; b=ERUIjktCk84jkrZl2shBhuM9Oywox/7ILjzB8kjtsFVPjRZzGxu//TZHV12rI7/CtS4s 7q2Uus3SHSyz64msFB26dm02N1d13b104z8RhkHYOLVxgU5VrRCFu2eehTtfHE+2tKig T6zh4mvXKZVmH5FOrsRThuy1QdKldpTp27KZQZo1Zvn7ilfbooojpIh+ZJF95R0Kyi6L VWBEldKWseDZHWsHzUnm0SCyDNLh2ZOT0cvb/uO9xnnv8bEwhbRbWrgCmiFuHrUI/PW7 ZL/7B26KY7OgUY7L/TM0uerS5gmtgfOw4QD8YjNHI8+RIc6R0ZUAY3IgK2mavr8jv2Yk zg== Received: from nasanppmta05.qualcomm.com (i-global254.qualcomm.com [199.106.103.254]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 3huwr23pur-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 10 Aug 2022 19:26:04 +0000 Received: from nasanex01c.na.qualcomm.com (nasanex01c.na.qualcomm.com [10.47.97.222]) by NASANPPMTA05.qualcomm.com (8.17.1.5/8.17.1.5) with ESMTPS id 27AJQ2Vh019356 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 10 Aug 2022 19:26:03 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; Wed, 10 Aug 2022 12:26:02 -0700 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 15.2.986.22; Wed, 10 Aug 2022 12:26:01 -0700 From: Kuogee Hsieh To: , , , , , , , , , CC: , , , , , , , Subject: [PATCH v3] drm/msm/dp: check hpd_state before push idle pattern at dp_bridge_disable() Date: Wed, 10 Aug 2022 12:25:51 -0700 Message-ID: <1660159551-13828-1-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-GUID: QJccwxpnxr0NLiT3POONYcw1jbSwkiXS X-Proofpoint-ORIG-GUID: QJccwxpnxr0NLiT3POONYcw1jbSwkiXS 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=2022-08-10_12,2022-08-10_01,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 bulkscore=0 mlxscore=0 adultscore=0 mlxlogscore=897 spamscore=0 lowpriorityscore=0 impostorscore=0 phishscore=0 clxscore=1015 priorityscore=1501 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2207270000 definitions=main-2208100059 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org dp_bridge_disable() is the first step toward tearing down main link. Its major function is to start transmitting idle pattern to replace video stream. This patch will check hpd_state to make sure main link is enabled before commit changes of main link's configuration to push idle pattern out to avoid system crashing due to main link clock is disabled while access main link registers. SError Interrupt on CPU7, code 0x00000000be000411 -- SError CPU: 7 PID: 3878 Comm: Xorg Not tainted 5.19.0-stb-cbq #19 Hardware name: Google Lazor (rev3 - 8) (DT) pstate: a04000c9 (NzCv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : __cmpxchg_case_acq_32+0x14/0x2c lr : do_raw_spin_lock+0xa4/0xdc sp : ffffffc01092b6a0 x29: ffffffc01092b6a0 x28: 0000000000000028 x27: 0000000000000038 x26: 0000000000000004 x25: ffffffd2973dce48 x24: 0000000000000000 x23: 00000000ffffffff x22: 00000000ffffffff x21: ffffffd2978d0008 x20: ffffffd2978d0008 x19: ffffff80ff759fc0 x18: 0000000000000000 x17: 004800a501260460 x16: 0441043b04600438 x15: 04380000089807d0 x14: 07b0089807800780 x13: 0000000000000000 x12: 0000000000000000 x11: 0000000000000438 x10: 00000000000007d0 x9 : ffffffd2973e09e4 x8 : ffffff8092d53300 x7 : ffffff808902e8b8 x6 : 0000000000000001 x5 : ffffff808902e880 x4 : 0000000000000000 x3 : ffffff80ff759fc0 x2 : 0000000000000001 x1 : 0000000000000000 x0 : ffffff80ff759fc0 Kernel panic - not syncing: Asynchronous SError Interrupt CPU: 7 PID: 3878 Comm: Xorg Not tainted 5.19.0-stb-cbq #19 Hardware name: Google Lazor (rev3 - 8) (DT) Call trace: dump_backtrace.part.0+0xbc/0xe4 show_stack+0x24/0x70 dump_stack_lvl+0x68/0x84 dump_stack+0x18/0x34 panic+0x14c/0x32c nmi_panic+0x58/0x7c arm64_serror_panic+0x78/0x84 do_serror+0x40/0x64 el1h_64_error_handler+0x30/0x48 el1h_64_error+0x68/0x6c __cmpxchg_case_acq_32+0x14/0x2c _raw_spin_lock_irqsave+0x38/0x4c lock_timer_base+0x40/0x78 __mod_timer+0xf4/0x25c schedule_timeout+0xd4/0xfc __wait_for_common+0xac/0x140 wait_for_completion_timeout+0x2c/0x54 dp_ctrl_push_idle+0x40/0x88 dp_bridge_disable+0x24/0x30 drm_atomic_bridge_chain_disable+0x90/0xbc drm_atomic_helper_commit_modeset_disables+0x198/0x444 msm_atomic_commit_tail+0x1d0/0x374 commit_tail+0x80/0x108 drm_atomic_helper_commit+0x118/0x11c drm_atomic_commit+0xb4/0xe0 drm_client_modeset_commit_atomic+0x184/0x224 drm_client_modeset_commit_locked+0x58/0x160 drm_client_modeset_commit+0x3c/0x64 __drm_fb_helper_restore_fbdev_mode_unlocked+0x98/0xac drm_fb_helper_set_par+0x74/0x80 drm_fb_helper_hotplug_event+0xdc/0xe0 __drm_fb_helper_restore_fbdev_mode_unlocked+0x7c/0xac drm_fb_helper_restore_fbdev_mode_unlocked+0x20/0x2c drm_fb_helper_lastclose+0x20/0x2c drm_lastclose+0x44/0x6c drm_release+0x88/0xd4 __fput+0x104/0x220 ____fput+0x1c/0x28 task_work_run+0x8c/0x100 do_exit+0x450/0x8d0 do_group_exit+0x40/0xac __wake_up_parent+0x0/0x38 invoke_syscall+0x84/0x11c el0_svc_common.constprop.0+0xb8/0xe4 do_el0_svc+0x8c/0xb8 el0_svc+0x2c/0x54 el0t_64_sync_handler+0x120/0x1c0 el0t_64_sync+0x190/0x194 SMP: stopping secondary CPUs Kernel Offset: 0x128e800000 from 0xffffffc008000000 PHYS_OFFSET: 0x80000000 CPU features: 0x800,00c2a015,19801c82 Memory Limit: none Changes in v3: -- correct Reported-by -- add call stack trace Changes in v2: -- changes Fixes patch -- fix eported-by -- add Closes tag Fixes: 375a126090b9 ("drm/msm/dp: tear down main link at unplug handle immediately") Reported-by: Leonard Lausen Closes: https://gitlab.freedesktop.org/drm/msm/-/issues/17 Signed-off-by: Kuogee Hsieh --- drivers/gpu/drm/msm/dp/dp_display.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c index b36f8b6..678289a 100644 --- a/drivers/gpu/drm/msm/dp/dp_display.c +++ b/drivers/gpu/drm/msm/dp/dp_display.c @@ -1729,10 +1729,20 @@ void dp_bridge_disable(struct drm_bridge *drm_bridge) struct msm_dp_bridge *dp_bridge = to_dp_bridge(drm_bridge); struct msm_dp *dp = dp_bridge->dp_display; struct dp_display_private *dp_display; + u32 state; dp_display = container_of(dp, struct dp_display_private, dp_display); + mutex_lock(&dp_display->event_mutex); + + state = dp_display->hpd_state; + if (state != ST_DISCONNECT_PENDING && state != ST_CONNECTED) { + mutex_unlock(&dp_display->event_mutex); + return; + } + dp_ctrl_push_idle(dp_display->ctrl); + mutex_unlock(&dp_display->event_mutex); } void dp_bridge_post_disable(struct drm_bridge *drm_bridge)