From patchwork Tue Aug 9 20:44:50 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kuogee Hsieh X-Patchwork-Id: 12939948 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 gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 9177BC25B06 for ; Tue, 9 Aug 2022 21:16:24 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 05A95C35C7; Tue, 9 Aug 2022 21:16:16 +0000 (UTC) X-Greylist: delayed 1848 seconds by postgrey-1.36 at gabe; Tue, 09 Aug 2022 21:15:56 UTC Received: from mx0b-0031df01.pphosted.com (mx0b-0031df01.pphosted.com [205.220.180.131]) by gabe.freedesktop.org (Postfix) with ESMTPS id C958DC1C57; Tue, 9 Aug 2022 21:15:56 +0000 (UTC) Received: from pps.filterd (m0279870.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.17.1.5/8.17.1.5) with ESMTP id 279JdZkR008907; Tue, 9 Aug 2022 20:45:01 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=IEE0YHiaWW61YmH/j85ir0CvCiEo9J0vpFpZfNkOFUM=; b=F5BfVaDcYMMED9p/4k+UaxY/T3HlYYvEx5WTevmN6qdTsu+i78hq/mjxLN1z5cU9kTtw rciyrHQp4niPYGSdpY5dGweDEiqGFek8tEfhJXhufnuwUk+V7bXR66SK+24cJbeIfPEa mI7lV8cYCNYj15jiACrApngqpAPRlCdvbCQy7EzvVTZfChG05aqQZ/Yzk0M61+0ADCOI 6cQ/4C2YQPWnuSrXgZMj34NVDywxJRjofZ4Z3gJIvGTms/dKK7JItuGQ03aGvM2WKBUU F0Mk8Kz55rhcxS/4Bor7Cs2Ze7JSvNqvGisv17XjvQsj69sfA8TyrWAHQ0p2D+4FQ3QZ hg== Received: from nasanppmta04.qualcomm.com (i-global254.qualcomm.com [199.106.103.254]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 3huwr5g4s7-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 09 Aug 2022 20:45:01 +0000 Received: from nasanex01c.na.qualcomm.com (nasanex01c.na.qualcomm.com [10.47.97.222]) by NASANPPMTA04.qualcomm.com (8.17.1.5/8.17.1.5) with ESMTPS id 279Kj0rF004101 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 9 Aug 2022 20:45:00 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; Tue, 9 Aug 2022 13:45:00 -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; Tue, 9 Aug 2022 13:44:59 -0700 From: Kuogee Hsieh To: , , , , , , , , , Subject: [PATCH] drm/msm/dp: check hpd_state before push idle pattern at dp_bridge_disable() Date: Tue, 9 Aug 2022 13:44:50 -0700 Message-ID: <1660077890-31622-1-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: nasanex01b.na.qualcomm.com (10.46.141.250) 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: AetsPD28bEHPnV7Wmy05NjwCeOGwWvSL X-Proofpoint-ORIG-GUID: AetsPD28bEHPnV7Wmy05NjwCeOGwWvSL 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=2022-08-09_05,2022-08-09_02,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=0 bulkscore=0 spamscore=0 clxscore=1011 lowpriorityscore=0 phishscore=0 impostorscore=0 mlxscore=0 adultscore=0 mlxlogscore=999 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2207270000 definitions=main-2208090076 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: quic_sbillaka@quicinc.com, linux-arm-msm@vger.kernel.org, quic_abhinavk@quicinc.com, dri-devel@lists.freedesktop.org, quic_khsieh@quicinc.com, quic_aravindh@quicinc.com, freedreno@lists.freedesktop.org, linux-kernel@vger.kernel.org Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" 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. Fixes: 13ea4799a81b ("drm/msm/dp: remove extra wrappers and public functions"); Signed-off-by: Kuogee Hsieh Reported-by: Leonard Lausen @leezu --- 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)