From patchwork Fri Jun 24 17:15:12 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kuogee Hsieh X-Patchwork-Id: 12894902 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 0BD5CCCA473 for ; Fri, 24 Jun 2022 17:15:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232043AbiFXRPc (ORCPT ); Fri, 24 Jun 2022 13:15:32 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36740 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229522AbiFXRP3 (ORCPT ); Fri, 24 Jun 2022 13:15:29 -0400 Received: from alexa-out-sd-02.qualcomm.com (alexa-out-sd-02.qualcomm.com [199.106.114.39]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2D92D63628; Fri, 24 Jun 2022 10:15:29 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; i=@quicinc.com; q=dns/txt; s=qcdkim; t=1656090929; x=1687626929; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version; bh=fT+ythOYCVlNcrsvXZFZiFoUH/exNdQzHOf/KDYIKOM=; b=AWXP7Rfhyhvd7cq2zH3Z7R5zW33w8SE1eAlzWuopWL36gFKnid2r0m8x INEtENViP5ieTSP1itSL57uHg3zaU4GdzVSZMYKbE+VwlqjfOF5lI8CDr PNTrv543quALmtWwRs5kCMjc2VAIGaFNwJBQUo8sZa1RILuryOjuQbP7V A=; Received: from unknown (HELO ironmsg03-sd.qualcomm.com) ([10.53.140.143]) by alexa-out-sd-02.qualcomm.com with ESMTP; 24 Jun 2022 10:15:29 -0700 X-QCInternal: smtphost Received: from nasanex01c.na.qualcomm.com ([10.47.97.222]) by ironmsg03-sd.qualcomm.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 24 Jun 2022 10:15:28 -0700 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 15.2.986.22; Fri, 24 Jun 2022 10:15:28 -0700 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; Fri, 24 Jun 2022 10:15:27 -0700 From: Kuogee Hsieh To: , , , , , , , , , , CC: Kuogee Hsieh , , , , , , Subject: [PATCH v1 3/3] drm/msm/dp: place edp at head of drm bridge chain to fix screen corruption Date: Fri, 24 Jun 2022 10:15:12 -0700 Message-ID: <1656090912-18074-4-git-send-email-quic_khsieh@quicinc.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1656090912-18074-1-git-send-email-quic_khsieh@quicinc.com> References: <1656090912-18074-1-git-send-email-quic_khsieh@quicinc.com> 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) Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org The msm_dp_modeset_init() is used to attach DP driver to drm bridge chain. msm_dp_modeset_init() is executed in the order of index (dp->id) of DP descriptor table. Currently, DP is placed at first entry (dp->id = 0) of descriptor table and eDP is placed at secondary entry (dp->id = 1 ) of descriptor table. This means DP will be placed at head of bridge chain and eDP will be placed right after DP at bridge chain. Drm screen update is happen sequentially in the order from head to tail of bridge chain. Therefore external DP display will have screen updated happen before primary eDP display if external DP display presented. This is wrong screen update order and cause one frame time screen corruption happen at primary display during external DP plugged in. This patch place eDP at first entry (dp->id = 0) of descriptor table and place DP at secondary entry (dp->id = 1) to have primary eDP locate at head of bridge chain. This correct screen update order and eliminated the one frame time screen corruption happen d at primary display. Signed-off-by: Kuogee Hsieh --- drivers/gpu/drm/msm/dp/dp_display.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c index a87a9d8..2755ff3 100644 --- a/drivers/gpu/drm/msm/dp/dp_display.c +++ b/drivers/gpu/drm/msm/dp/dp_display.c @@ -143,10 +143,10 @@ static const struct msm_dp_config sc7180_dp_cfg = { static const struct msm_dp_config sc7280_dp_cfg = { .descs = (const struct msm_dp_desc[]) { - { .io_start = 0x0ae90000, .connector_type = DRM_MODE_CONNECTOR_DisplayPort, - .controller_id = MSM_DP_CONTROLLER_0, .wide_bus_en = true }, { .io_start = 0x0aea0000, .connector_type = DRM_MODE_CONNECTOR_eDP, .controller_id = MSM_DP_CONTROLLER_1, .wide_bus_en = true }, + { .io_start = 0x0ae90000, .connector_type = DRM_MODE_CONNECTOR_DisplayPort, + .controller_id = MSM_DP_CONTROLLER_0, .wide_bus_en = true }, }, .num_descs = 2, };