From patchwork Tue Nov 3 20:49:01 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kuogee Hsieh X-Patchwork-Id: 11879905 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-12.5 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 53DF9C388F7 for ; Wed, 4 Nov 2020 08:24:17 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id DCFE920781 for ; Wed, 4 Nov 2020 08:24:16 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=mg.codeaurora.org header.i=@mg.codeaurora.org header.b="qoCTI02S" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org DCFE920781 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=dri-devel-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 2462C6F400; Wed, 4 Nov 2020 08:22:59 +0000 (UTC) Received: from z5.mailgun.us (z5.mailgun.us [104.130.96.5]) by gabe.freedesktop.org (Postfix) with ESMTPS id 5C3DA6E8F8 for ; Tue, 3 Nov 2020 20:49:36 +0000 (UTC) DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1604436576; h=Content-Transfer-Encoding: MIME-Version: References: In-Reply-To: Message-Id: Date: Subject: Cc: To: From: Sender; bh=G7R58XQghOvRHKSp4QYRhaBuVDGOZgFKpr4YuVFG5hk=; b=qoCTI02SdKqEInEfDIgpWJ/ZYnTGtJ+PLuFZ5ZfB3uHLZeZY5DuLMaBnVAQ5PxG3Aww7pScn 3UeOmBkhtknO8WiKTk+KCENMCkaOJBtPoo1WwaX7j851/fkwaQItZZFmseS2eSP/MHpV4oqi PszL09e6Z9vOevwDAZhkgvLqQgc= X-Mailgun-Sending-Ip: 104.130.96.5 X-Mailgun-Sid: WyJkOTU5ZSIsICJkcmktZGV2ZWxAbGlzdHMuZnJlZWRlc2t0b3Aub3JnIiwgImJlOWU0YSJd Received: from smtp.codeaurora.org (ec2-35-166-182-171.us-west-2.compute.amazonaws.com [35.166.182.171]) by smtp-out-n07.prod.us-east-1.postgun.com with SMTP id 5fa1c260b79ce7b2cdb15bd4 (version=TLS1.2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256); Tue, 03 Nov 2020 20:49:36 GMT Received: by smtp.codeaurora.org (Postfix, from userid 1001) id 20E19C38521; Tue, 3 Nov 2020 20:49:34 +0000 (UTC) Received: from khsieh-linux1.qualcomm.com (i-global254.qualcomm.com [199.106.103.254]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: khsieh) by smtp.codeaurora.org (Postfix) with ESMTPSA id 066EDC384FA; Tue, 3 Nov 2020 20:49:31 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 066EDC384FA Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; spf=fail smtp.mailfrom=khsieh@codeaurora.org From: Kuogee Hsieh To: dri-devel@lists.freedesktop.org, robdclark@gmail.com, sean@poorly.run, swboyd@chromium.org Subject: [PATCH 2/3] drm/msm/dp: skip checking LINK_STATUS_UPDATED bit Date: Tue, 3 Nov 2020 12:49:01 -0800 Message-Id: <20201103204902.11899-3-khsieh@codeaurora.org> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20201103204902.11899-1-khsieh@codeaurora.org> References: <20201103204902.11899-1-khsieh@codeaurora.org> MIME-Version: 1.0 X-Mailman-Approved-At: Wed, 04 Nov 2020 08:22:13 +0000 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: airlied@linux.ie, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, abhinavk@codeaurora.org, Kuogee Hsieh , tanmay@codeaurora.org, aravindh@codeaurora.org, freedreno@lists.freedesktop.org Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Some dongle will not clear LINK_STATUS_UPDATED bit after DPCD read which cause link training failed. This patch just read 6 bytes of DPCD link status from sink and return without checking LINK_STATUS_UPDATED bit. Only 8 bits are used to represent link rate at sinker DPCD. The really link rate is 2.7Mb times the 8 bits value. For example, 0x0A at DPCD is equal to 2.7Gb (10 * 2.7Mb). This patch also convert 8 bits value of DPCD to really link rate to fix worng link rate error during phy compliance test. Fixes: fd4a29bed29b (drm/msm/dp: DisplayPort PHY compliance tests fixup) Signed-off-by: Kuogee Hsieh --- drivers/gpu/drm/msm/dp/dp_ctrl.c | 20 ++++++-------------- drivers/gpu/drm/msm/dp/dp_link.c | 29 ++++++++++++++--------------- 2 files changed, 20 insertions(+), 29 deletions(-) diff --git a/drivers/gpu/drm/msm/dp/dp_ctrl.c b/drivers/gpu/drm/msm/dp/dp_ctrl.c index c7af040ce252..b9ca844ce2ad 100644 --- a/drivers/gpu/drm/msm/dp/dp_ctrl.c +++ b/drivers/gpu/drm/msm/dp/dp_ctrl.c @@ -1061,23 +1061,15 @@ static bool dp_ctrl_train_pattern_set(struct dp_ctrl_private *ctrl, static int dp_ctrl_read_link_status(struct dp_ctrl_private *ctrl, u8 *link_status) { - int len = 0; - u32 const offset = DP_LANE_ALIGN_STATUS_UPDATED - DP_LANE0_1_STATUS; - u32 link_status_read_max_retries = 100; - - while (--link_status_read_max_retries) { - len = drm_dp_dpcd_read_link_status(ctrl->aux, - link_status); - if (len != DP_LINK_STATUS_SIZE) { - DRM_ERROR("DP link status read failed, err: %d\n", len); - return len; - } + int ret = 0, len; - if (!(link_status[offset] & DP_LINK_STATUS_UPDATED)) - return 0; + len = drm_dp_dpcd_read_link_status(ctrl->aux, link_status); + if (len != DP_LINK_STATUS_SIZE) { + DRM_ERROR("DP link status read failed, err: %d\n", len); + ret = -EINVAL; } - return -ETIMEDOUT; + return ret; } static int dp_ctrl_link_train_1(struct dp_ctrl_private *ctrl, diff --git a/drivers/gpu/drm/msm/dp/dp_link.c b/drivers/gpu/drm/msm/dp/dp_link.c index 49d7fad36fc4..be986da78c4a 100644 --- a/drivers/gpu/drm/msm/dp/dp_link.c +++ b/drivers/gpu/drm/msm/dp/dp_link.c @@ -773,7 +773,8 @@ static int dp_link_process_link_training_request(struct dp_link_private *link) link->request.test_lane_count); link->dp_link.link_params.num_lanes = link->request.test_lane_count; - link->dp_link.link_params.rate = link->request.test_link_rate; + link->dp_link.link_params.rate = + drm_dp_bw_code_to_link_rate(link->request.test_link_rate); return 0; } @@ -943,22 +944,20 @@ static u8 get_link_status(const u8 link_status[DP_LINK_STATUS_SIZE], int r) */ static int dp_link_process_link_status_update(struct dp_link_private *link) { - if (!(get_link_status(link->link_status, - DP_LANE_ALIGN_STATUS_UPDATED) & - DP_LINK_STATUS_UPDATED) || - (drm_dp_clock_recovery_ok(link->link_status, - link->dp_link.link_params.num_lanes) && - drm_dp_channel_eq_ok(link->link_status, - link->dp_link.link_params.num_lanes))) - return -EINVAL; + bool channel_eq_done = drm_dp_channel_eq_ok(link->link_status, + link->dp_link.link_params.num_lanes); - DRM_DEBUG_DP("channel_eq_done = %d, clock_recovery_done = %d\n", - drm_dp_clock_recovery_ok(link->link_status, - link->dp_link.link_params.num_lanes), - drm_dp_clock_recovery_ok(link->link_status, - link->dp_link.link_params.num_lanes)); + bool clock_recovery_done = drm_dp_clock_recovery_ok(link->link_status, + link->dp_link.link_params.num_lanes); - return 0; + DRM_DEBUG_DP("channel_eq_done = %d, clock_recovery_done = %d\n", + channel_eq_done, clock_recovery_done); + + if (channel_eq_done && clock_recovery_done) + return -EINVAL; + + + return 0; } /**