From nobody Wed Jul 1 06:51:28 2026 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 69557C433F5 for ; Tue, 28 Dec 2021 18:51:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234050AbhL1Svn (ORCPT ); Tue, 28 Dec 2021 13:51:43 -0500 Received: from alexa-out.qualcomm.com ([129.46.98.28]:47884 "EHLO alexa-out.qualcomm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237122AbhL1Svi (ORCPT ); Tue, 28 Dec 2021 13:51:38 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; i=@quicinc.com; q=dns/txt; s=qcdkim; t=1640717498; x=1672253498; h=from:to:cc:subject:date:message-id:mime-version; bh=5Joo2qg1o4pOEw6JsCdFnvpGchiUe4q9GhRjGQU+liw=; b=UHqwtfYc0bMAq55Ht6SB7j1we47kklyk8r6i4BE6KgRnaoM9YE7gizmf a8Wg98igebuPDzNYnEAWYm/Da+XZ9F3/1olD9cY2zy/0duS6qFaJc2ozw ysFj28BjO71cadjFtXVZ+mBVwiiD/3s73tW//ASsDGcXTMFFlfgOcnvT+ I=; Received: from ironmsg09-lv.qualcomm.com ([10.47.202.153]) by alexa-out.qualcomm.com with ESMTP; 28 Dec 2021 10:51:38 -0800 X-QCInternal: smtphost Received: from nasanex01c.na.qualcomm.com ([10.47.97.222]) by ironmsg09-lv.qualcomm.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 28 Dec 2021 10:51:37 -0800 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 15.2.922.19; Tue, 28 Dec 2021 10:51:37 -0800 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 15.2.922.19; Tue, 28 Dec 2021 10:51:36 -0800 From: Kuogee Hsieh To: , , , , , , , , CC: , , , , , , , , Kuogee Hsieh Subject: [PATCH] drm/msm/dp: add support of tps4 (training pattern 4) for HBR3 Date: Tue, 28 Dec 2021 10:51:29 -0800 Message-ID: <1640717489-7366-1-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) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Kuogee Hsieh Some DP sinkers prefer to use tps4 instead of tps3 during training #2. This patch will use tps4 to perform link training #2 if sinker's DPCD supports it. Signed-off-by: Kuogee Hsieh --- drivers/gpu/drm/msm/dp/dp_ctrl.c | 16 ++++++++++++---- 1 file changed, 12 insertions(+), 4 deletions(-) diff --git a/drivers/gpu/drm/msm/dp/dp_ctrl.c b/drivers/gpu/drm/msm/dp/dp_c= trl.c index 39558a2..c7b0657 100644 --- a/drivers/gpu/drm/msm/dp/dp_ctrl.c +++ b/drivers/gpu/drm/msm/dp/dp_ctrl.c @@ -1181,7 +1181,7 @@ static int dp_ctrl_link_train_2(struct dp_ctrl_privat= e *ctrl, int *training_step) { int tries =3D 0, ret =3D 0; - char pattern; + char pattern, state_ctrl_bit; int const maximum_retries =3D 5; u8 link_status[DP_LINK_STATUS_SIZE]; =20 @@ -1189,12 +1189,20 @@ static int dp_ctrl_link_train_2(struct dp_ctrl_priv= ate *ctrl, =20 *training_step =3D DP_TRAINING_2; =20 - if (drm_dp_tps3_supported(ctrl->panel->dpcd)) + if (drm_dp_tps4_supported(ctrl->panel->dpcd)) { + pattern =3D DP_TRAINING_PATTERN_4; + state_ctrl_bit =3D 4; + } + else if (drm_dp_tps3_supported(ctrl->panel->dpcd)) { pattern =3D DP_TRAINING_PATTERN_3; - else + state_ctrl_bit =3D 3; + } + else { pattern =3D DP_TRAINING_PATTERN_2; + state_ctrl_bit =3D 2; + } =20 - ret =3D dp_catalog_ctrl_set_pattern(ctrl->catalog, pattern); + ret =3D dp_catalog_ctrl_set_pattern(ctrl->catalog, state_ctrl_bit); if (ret) return ret; =20 --=20 The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project