From patchwork Tue Apr 26 00:16:53 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kuogee Hsieh X-Patchwork-Id: 12826375 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 7838FC433EF for ; Tue, 26 Apr 2022 00:17:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240121AbiDZAUS (ORCPT ); Mon, 25 Apr 2022 20:20:18 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42706 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240041AbiDZAUO (ORCPT ); Mon, 25 Apr 2022 20:20:14 -0400 Received: from alexa-out-sd-01.qualcomm.com (alexa-out-sd-01.qualcomm.com [199.106.114.38]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E21D1124DA3; Mon, 25 Apr 2022 17:17:08 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; i=@quicinc.com; q=dns/txt; s=qcdkim; t=1650932228; x=1682468228; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version; bh=FEGkV2W5TKChumk6hYFXrpQXt6K4knLdyPVjreHro38=; b=p3NT8QB515cK1+vPq7+hSH7fap+eIcxUok6r5N9wttGzolAoRG+/6ydP 7r9Ot5paMpBvCpeIOO2A8SLoTDRddcZgvE/n2YzTfcWhsl2JRUDrKunqR 7DUecVsJo9JYOnNvhqI4qEST2ACQwueU2ENEE4iTKCENA3sNHyOZAG3bl c=; Received: from unknown (HELO ironmsg04-sd.qualcomm.com) ([10.53.140.144]) by alexa-out-sd-01.qualcomm.com with ESMTP; 25 Apr 2022 17:17:08 -0700 X-QCInternal: smtphost Received: from nasanex01c.na.qualcomm.com ([10.47.97.222]) by ironmsg04-sd.qualcomm.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 25 Apr 2022 17:17:08 -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; Mon, 25 Apr 2022 17:17:07 -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; Mon, 25 Apr 2022 17:17:06 -0700 From: Kuogee Hsieh To: , , , , , , , , , CC: Kuogee Hsieh , , , , , , Subject: [PATCH v2 2/2] drm/msm/dp: do not stop transmitting phy test pattern during DP phy compliance test Date: Mon, 25 Apr 2022 17:16:53 -0700 Message-ID: <1650932213-19162-3-git-send-email-quic_khsieh@quicinc.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1650932213-19162-1-git-send-email-quic_khsieh@quicinc.com> References: <1650932213-19162-1-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 At normal operation, transmit phy test pattern has to be terminated before DP controller switch to video ready state. However during phy compliance testing, transmit phy test pattern should not be terminated until end of compliance test which usually indicated by unplugged interrupt. Only stop sending the train pattern in dp_ctrl_on_stream() if we're not doing compliance testing. We also no longer reset 'p_level' and 'v_level' within dp_ctrl_on_link() due to both 'p_level' and 'v_level' are acquired from link status at previous dpcd read and we like to use those level to start link training. Changes in v2: -- add more details commit text -- correct Fixes 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 | 15 +++++++-------- 1 file changed, 7 insertions(+), 8 deletions(-) diff --git a/drivers/gpu/drm/msm/dp/dp_ctrl.c b/drivers/gpu/drm/msm/dp/dp_ctrl.c index 193cc1a..f99e173 100644 --- a/drivers/gpu/drm/msm/dp/dp_ctrl.c +++ b/drivers/gpu/drm/msm/dp/dp_ctrl.c @@ -1699,8 +1699,6 @@ int dp_ctrl_on_link(struct dp_ctrl *dp_ctrl) ctrl->link->link_params.rate, ctrl->link->link_params.num_lanes, ctrl->dp_ctrl.pixel_rate); - ctrl->link->phy_params.p_level = 0; - ctrl->link->phy_params.v_level = 0; rc = dp_ctrl_enable_mainlink_clocks(ctrl); if (rc) @@ -1822,12 +1820,6 @@ int dp_ctrl_on_stream(struct dp_ctrl *dp_ctrl) } } - if (!dp_ctrl_channel_eq_ok(ctrl)) - dp_ctrl_link_retrain(ctrl); - - /* stop txing train pattern to end link training */ - dp_ctrl_clear_training_pattern(ctrl); - ret = dp_ctrl_enable_stream_clocks(ctrl); if (ret) { DRM_ERROR("Failed to start pixel clocks. ret=%d\n", ret); @@ -1839,6 +1831,13 @@ int dp_ctrl_on_stream(struct dp_ctrl *dp_ctrl) return 0; } + if (!dp_ctrl_channel_eq_ok(ctrl)) { + dp_ctrl_link_retrain(ctrl); + } + + /* stop txing train pattern to end link training */ + dp_ctrl_clear_training_pattern(ctrl); + /* * Set up transfer unit values and set controller state to send * video.