From patchwork Mon Jan 10 20:55:44 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kuogee Hsieh X-Patchwork-Id: 12709119 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 09DC6C433F5 for ; Mon, 10 Jan 2022 20:57:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1343749AbiAJU5I (ORCPT ); Mon, 10 Jan 2022 15:57:08 -0500 Received: from alexa-out.qualcomm.com ([129.46.98.28]:43524 "EHLO alexa-out.qualcomm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1343758AbiAJU4h (ORCPT ); Mon, 10 Jan 2022 15:56:37 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; i=@quicinc.com; q=dns/txt; s=qcdkim; t=1641848197; x=1673384197; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version; bh=wkcx8yhc1NDBOwW5wpk2gvjvV2US1a+cGwD3ec51VaI=; b=biD8jmH27Sx5jl80YIqWG8WEfXzFhKdGiKeI9kny1oUoHx4LhiYJQ5ZY tBb6e/N5FhWjpyViRlPK65Zc5+D/TYcLD4eXktsRuAI4yO2htdIkWZm/C ZMyy4VY26Cznnh9WQcCViUdzgREl/0PGEhm+2PwUJCYQIQQ6cduz/6l6f s=; Received: from ironmsg07-lv.qualcomm.com ([10.47.202.151]) by alexa-out.qualcomm.com with ESMTP; 10 Jan 2022 12:56:37 -0800 X-QCInternal: smtphost Received: from nasanex01c.na.qualcomm.com ([10.47.97.222]) by ironmsg07-lv.qualcomm.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 10 Jan 2022 12:56:38 -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; Mon, 10 Jan 2022 12:56:37 -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; Mon, 10 Jan 2022 12:56:36 -0800 From: Kuogee Hsieh To: , , , , , , , , , CC: Kuogee Hsieh , , , , , , Subject: [PATCH v10 5/5] drm/msm/dp: stop link training after link training 2 failed Date: Mon, 10 Jan 2022 12:55:44 -0800 Message-ID: <1641848144-25147-6-git-send-email-quic_khsieh@quicinc.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1641848144-25147-1-git-send-email-quic_khsieh@quicinc.com> References: <1641848144-25147-1-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) Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org Each DP link training contains link training 1 followed by link training 2. There is maximum of 5 retries of DP link training before declared link training failed. It is required to stop link training at end of link training 2 if it is failed so that next link training 1 can start freshly. This patch fixes link compliance test case 4.3.1.13 (Source Device Link Training EQ Fallback Test). Changes in v10: -- group into one series Fixes: 2e0adc765d88 ("drm/msm/dp: do not end dp link training until video is ready") Signed-off-by: Kuogee Hsieh Reviewed-by: Stephen Boyd --- drivers/gpu/drm/msm/dp/dp_ctrl.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/gpu/drm/msm/dp/dp_ctrl.c b/drivers/gpu/drm/msm/dp/dp_ctrl.c index f98df93..245e1b9 100644 --- a/drivers/gpu/drm/msm/dp/dp_ctrl.c +++ b/drivers/gpu/drm/msm/dp/dp_ctrl.c @@ -1755,6 +1755,9 @@ int dp_ctrl_on_link(struct dp_ctrl *dp_ctrl) /* end with failure */ break; /* lane == 1 already */ } + + /* stop link training before start re training */ + dp_ctrl_clear_training_pattern(ctrl); } }