From mboxrd@z Thu Jan 1 00:00:00 1970 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 7CFCBC19F28 for ; Wed, 27 Jul 2022 04:51:26 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 0FB51B1690; Wed, 27 Jul 2022 04:50:51 +0000 (UTC) Received: from mailgw01.mediatek.com (unknown [60.244.123.138]) by gabe.freedesktop.org (Postfix) with ESMTPS id AE86BC1219 for ; Wed, 27 Jul 2022 04:50:44 +0000 (UTC) X-UUID: a281cf18aa514473a8cf1ddd6a5010a1-20220727 X-CID-P-RULE: Release_Ham X-CID-O-INFO: VERSION:1.1.8, REQID:4928f49d-2377-4677-af50-715a2630429e, OB:0, LO B:0,IP:0,URL:0,TC:0,Content:-5,EDM:0,RT:0,SF:0,FILE:0,RULE:Release_Ham,ACT ION:release,TS:-5 X-CID-META: VersionHash:0f94e32, CLOUDID:a2dc7bc9-5f65-4fda-abe9-f2436fed4c72, C OID:IGNORED,Recheck:0,SF:nil,TC:nil,Content:0,EDM:-3,IP:nil,URL:0,File:nil ,QS:nil,BEC:nil,COL:0 X-UUID: a281cf18aa514473a8cf1ddd6a5010a1-20220727 Received: from mtkexhb01.mediatek.inc [(172.21.101.102)] by mailgw01.mediatek.com (envelope-from ) (Generic MTA with TLSv1.2 ECDHE-RSA-AES256-SHA384 256/256) with ESMTP id 61687357; Wed, 27 Jul 2022 12:50:41 +0800 Received: from mtkmbs11n2.mediatek.inc (172.21.101.187) by mtkmbs11n2.mediatek.inc (172.21.101.187) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.792.15; Wed, 27 Jul 2022 12:50:39 +0800 Received: from mtksdccf07.mediatek.inc (172.21.84.99) by mtkmbs11n2.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.2.792.15 via Frontend Transport; Wed, 27 Jul 2022 12:50:39 +0800 From: Bo-Chen Chen To: , , , , , , , , , Subject: [PATCH v15 07/11] drm/mediatek: Add retry to prevent misjudgment for sink devices Date: Wed, 27 Jul 2022 12:50:31 +0800 Message-ID: <20220727045035.32225-8-rex-bc.chen@mediatek.com> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20220727045035.32225-1-rex-bc.chen@mediatek.com> References: <20220727045035.32225-1-rex-bc.chen@mediatek.com> MIME-Version: 1.0 Content-Type: text/plain X-MTK: N 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: devicetree@vger.kernel.org, linux-fbdev@vger.kernel.org, granquet@baylibre.com, jitao.shi@mediatek.com, liangxu.xu@mediatek.com, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, msp@baylibre.com, Project_Global_Chrome_Upstream_Group@mediatek.com, Bo-Chen Chen , linux-mediatek@lists.infradead.org, wenst@chromium.org, linux-arm-kernel@lists.infradead.org, angelogioacchino.delregno@collabora.com Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" For some DP dungles, we need to train more than onece to confirm that we don't misjudge the status of sink device. Signed-off-by: Bo-Chen Chen --- drivers/gpu/drm/mediatek/mtk_dp.c | 21 ++++++++++++++++++--- 1 file changed, 18 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/mediatek/mtk_dp.c b/drivers/gpu/drm/mediatek/mtk_dp.c index ce817cb59445..80d7d6488105 100644 --- a/drivers/gpu/drm/mediatek/mtk_dp.c +++ b/drivers/gpu/drm/mediatek/mtk_dp.c @@ -42,6 +42,7 @@ #define MTK_DP_CHECK_SINK_CAP_TIMEOUT_COUNT 3 #define MTK_DP_TBC_BUF_READ_START_ADDR 0x08 #define MTK_DP_TRAIN_DOWNSCALE_RETRY 8 +#define MTK_DP_TRAIN_CLEAR_RETRY 50 struct mtk_dp_train_info { bool tps3; @@ -1431,11 +1432,25 @@ static int mtk_dp_video_config(struct mtk_dp *mtk_dp) static int mtk_dp_training(struct mtk_dp *mtk_dp) { + short max_retry = MTK_DP_TRAIN_CLEAR_RETRY; int ret; - ret = mtk_dp_train_start(mtk_dp); - if (ret) - return ret; + /* + * We do retry to confirm that we don't misjudge the sink status. + * If it is still failed, we can confirm there are some issues for the + * sink device. + */ + do { + ret = mtk_dp_train_start(mtk_dp); + if (!ret) + break; + } while (--max_retry); + + dev_info(mtk_dp->dev, "dp training clear retry times: %d\n", + MTK_DP_TRAIN_CLEAR_RETRY - max_retry); + + if (!max_retry) + return -ETIMEDOUT; ret = mtk_dp_video_config(mtk_dp); if (ret) -- 2.18.0