From patchwork Mon Sep 12 16:23:50 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kuogee Hsieh X-Patchwork-Id: 12973800 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 5B724C6FA8B for ; Mon, 12 Sep 2022 16:29:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229700AbiILQ30 (ORCPT ); Mon, 12 Sep 2022 12:29:26 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47458 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229520AbiILQ3Z (ORCPT ); Mon, 12 Sep 2022 12:29:25 -0400 Received: from mx0a-0031df01.pphosted.com (mx0a-0031df01.pphosted.com [205.220.168.131]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 89781201B9; Mon, 12 Sep 2022 09:29:24 -0700 (PDT) Received: from pps.filterd (m0279866.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.17.1.5/8.17.1.5) with ESMTP id 28CFjW3k031878; Mon, 12 Sep 2022 16:29:09 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-type; s=qcppdkim1; bh=dTnMkDozvb7QDxxX/CsblARwT2bxwlx32kkKKMLjb2M=; b=WMJCZ6vbN4uknPzwXnmtiDge6jkDJi877cJwC6+qI0zWr6yg/6iJUIMPvYmlRBBg1/Nl 0stsCfeS9e9W98voUTRWGckHek48hVBEM5cKRxPlXLFfNQ4Mt+751i9BRABmTmhHt2g/ LRL6leMF/NxxYh9mYMAgEOJ0bmdpwKIgYAygnHcLI+jPPak/dhQr/GDMgtivywvIUFg2 lHd3fwvvamdx7J33p4wuOdfM152aBZaTGYNVSCjHWGJcQCTCZczesIoNFRzm+cQpVm8y 9uxxA/UP1jb65GUR50RFh62y+8ZT/aqSNiHdnwJb1cyqBTeSNOhNc4IwAWFSYbQhtufD Iw== Received: from nalasppmta05.qualcomm.com (Global_NAT1.qualcomm.com [129.46.96.20]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 3jgkve5dhr-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 12 Sep 2022 16:29:09 +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 28CGO8vf009213 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 12 Sep 2022 16:24:08 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 15.2.986.29; Mon, 12 Sep 2022 09:24:08 -0700 From: Kuogee Hsieh To: , , , , , , , , , , CC: Kuogee Hsieh , , , , , Subject: [PATCH v5 3/3] drm/msm/dp: retry 3 times if set sink to D0 poweer state failed Date: Mon, 12 Sep 2022 09:23:50 -0700 Message-ID: <1662999830-13916-4-git-send-email-quic_khsieh@quicinc.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1662999830-13916-1-git-send-email-quic_khsieh@quicinc.com> References: <1662999830-13916-1-git-send-email-quic_khsieh@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-ORIG-GUID: Yi2BlyIScYFS3t9gavXU7CC3XqzPrdCd X-Proofpoint-GUID: Yi2BlyIScYFS3t9gavXU7CC3XqzPrdCd X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.895,Hydra:6.0.528,FMLib:17.11.122.1 definitions=2022-09-12_12,2022-09-12_02,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 clxscore=1015 adultscore=0 mlxlogscore=999 spamscore=0 suspectscore=0 bulkscore=0 impostorscore=0 malwarescore=0 lowpriorityscore=0 phishscore=0 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2207270000 definitions=main-2209120056 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org Bring sink out of D3 (power down) mode into D0 (normal operation) mode by setting DP_SET_POWER_D0 bit to DP_SET_POWER dpcd register. This patch will retry 3 times if written to DP_SET_POWER register failed. Changes in v5: -- split into two patches Signed-off-by: Kuogee Hsieh --- drivers/gpu/drm/msm/dp/dp_link.c | 13 ++++++++----- 1 file changed, 8 insertions(+), 5 deletions(-) diff --git a/drivers/gpu/drm/msm/dp/dp_link.c b/drivers/gpu/drm/msm/dp/dp_link.c index 9d5381d..4360728 100644 --- a/drivers/gpu/drm/msm/dp/dp_link.c +++ b/drivers/gpu/drm/msm/dp/dp_link.c @@ -50,6 +50,7 @@ static int dp_aux_link_power_up(struct drm_dp_aux *aux, { u8 value; ssize_t len; + int i; if (link->revision < 0x11) return 0; @@ -61,11 +62,13 @@ static int dp_aux_link_power_up(struct drm_dp_aux *aux, value &= ~DP_SET_POWER_MASK; value |= DP_SET_POWER_D0; - len = drm_dp_dpcd_writeb(aux, DP_SET_POWER, value); - if (len < 0) - return len; - - usleep_range(1000, 2000); + /* retry for 1ms to give the sink time to wake up */ + for (i = 0; i < 3; i++) { + len = drm_dp_dpcd_writeb(aux, DP_SET_POWER, value); + usleep_range(1000, 2000); + if (len == 1) + break; + } return 0; }