From patchwork Thu Aug 11 22:39:05 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kuogee Hsieh X-Patchwork-Id: 12941783 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 D49AEC19F2A for ; Thu, 11 Aug 2022 22:39:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234106AbiHKWja (ORCPT ); Thu, 11 Aug 2022 18:39:30 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42938 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230114AbiHKWj3 (ORCPT ); Thu, 11 Aug 2022 18:39:29 -0400 Received: from mx0a-0031df01.pphosted.com (mx0a-0031df01.pphosted.com [205.220.168.131]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 950769C8E8; Thu, 11 Aug 2022 15:39:24 -0700 (PDT) Received: from pps.filterd (m0279863.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.17.1.5/8.17.1.5) with ESMTP id 27BMUEUP002228; Thu, 11 Aug 2022 22:39:14 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=8IOHp5XBj939tpA/3/lurHowXu9IZtVH/HDcgPQa+YQ=; b=RMjme85bTK6D/tXflq7VedQVxFkXwmw+VqKEqbvjktdvhIItArUCFxlJsQ5kJLOv+8WB zIa5zA5bApEIwV2vVZO7QHDKSMWrloZTC5qgvo789t43MOY0ORRCXro0ibBpuDM8AAjP qCKtBQR2LqWknP/RzEgN0unmG2/ZKaDiWC/7qH6Il0VrzrQYvLP6wKeYHvdKSAwnBEoR CGeptrAGnhcDuAAIq+TZusNg9pEGj1A1Qz9p3AtDuogMZkoSlx/ZWMP7krYKAzQbld6s a3aVZDrN5iw2D+zzbO4kEDVBoKMZ2oal3hElolGSYzfc8IYeJ5XGFzD8gLW4Rb6iMes/ UA== Received: from nalasppmta05.qualcomm.com (Global_NAT1.qualcomm.com [129.46.96.20]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 3hwahwg0pk-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 11 Aug 2022 22:39:14 +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 27BMdDWL022992 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 11 Aug 2022 22:39:13 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 15.2.986.22; Thu, 11 Aug 2022 15:39:12 -0700 From: Kuogee Hsieh To: , , , , , , , , , CC: , , , , , , Subject: [PATCH v4] drm/msm/dp: delete DP_RECOVERED_CLOCK_OUT_EN to fix tps4 Date: Thu, 11 Aug 2022 15:39:05 -0700 Message-ID: <1660257545-2288-1-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: wDVjSmurwZ4gk91VMeH1TTwnaeSSYMNz X-Proofpoint-ORIG-GUID: wDVjSmurwZ4gk91VMeH1TTwnaeSSYMNz 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=2022-08-11_14,2022-08-11_01,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 mlxscore=0 spamscore=0 suspectscore=0 clxscore=1015 bulkscore=0 adultscore=0 mlxlogscore=999 malwarescore=0 impostorscore=0 phishscore=0 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2207270000 definitions=main-2208110067 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org Data Symbols scrambled is required for tps4 at link training 2. Therefore SCRAMBLING_DISABLE bit should not be set for tps4 to work. RECOVERED_CLOCK_OUT_EN is for enable simple EYE test for jitter measurement with minimal equipment for embedded applications purpose and is not required to be set during normal operation. Current implementation always have RECOVERED_CLOCK_OUT_EN bit set which cause SCRAMBLING_DISABLE bit wrongly set at tps4 which prevent tps4 from working. This patch delete setting RECOVERED_CLOCK_OUT_EN to fix SCRAMBLING_DISABLE be wrongly set at tps4. Changes in v2: -- fix Fixes tag Changes in v3: -- revise commit text Changes in v4: -- fix commit text newline Fixes: c943b4948b58 ("drm/msm/dp: add displayPort driver support") Signed-off-by: Kuogee Hsieh Reviewed-by: Abhinav Kumar Reviewed-by: Stephen Boyd Reviewed-by: Dmitry Baryshkov --- drivers/gpu/drm/msm/dp/dp_ctrl.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/msm/dp/dp_ctrl.c b/drivers/gpu/drm/msm/dp/dp_ctrl.c index ab6aa13..013ca02 100644 --- a/drivers/gpu/drm/msm/dp/dp_ctrl.c +++ b/drivers/gpu/drm/msm/dp/dp_ctrl.c @@ -1214,7 +1214,7 @@ static int dp_ctrl_link_train_2(struct dp_ctrl_private *ctrl, if (ret) return ret; - dp_ctrl_train_pattern_set(ctrl, pattern | DP_RECOVERED_CLOCK_OUT_EN); + dp_ctrl_train_pattern_set(ctrl, pattern); for (tries = 0; tries <= maximum_retries; tries++) { drm_dp_link_train_channel_eq_delay(ctrl->aux, ctrl->panel->dpcd);