From patchwork Fri Apr 16 17:38:51 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kuogee Hsieh X-Patchwork-Id: 12208413 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=-16.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham 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 0E902C433B4 for ; Fri, 16 Apr 2021 17:39:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DE9F0611ED for ; Fri, 16 Apr 2021 17:39:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235792AbhDPRjh (ORCPT ); Fri, 16 Apr 2021 13:39:37 -0400 Received: from so254-9.mailgun.net ([198.61.254.9]:57756 "EHLO so254-9.mailgun.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S243411AbhDPRjh (ORCPT ); Fri, 16 Apr 2021 13:39:37 -0400 DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1618594752; h=Message-Id: Date: Subject: Cc: To: From: Sender; bh=piGppBojtqCVXDMpx0SlbAI0Ep5s6X3/HUnzkiklKDw=; b=mj9TF5a3nnAJMoIdH9FyJ16up2KGD0wDu2m8kVfkfdTBrucRSsO56dxCiYaJOlFtgOVzDJ1x SJbYin83arQCX8JB5yl2K6uuWDguoIRzUiXhwcLQY4gsxJNHM3OZmVnuH8PpoHoXDUTJuiwc a55BOxjJSH1bg4QI8NipbpDVWRM= X-Mailgun-Sending-Ip: 198.61.254.9 X-Mailgun-Sid: WyI1MzIzYiIsICJsaW51eC1hcm0tbXNtQHZnZXIua2VybmVsLm9yZyIsICJiZTllNGEiXQ== Received: from smtp.codeaurora.org (ec2-35-166-182-171.us-west-2.compute.amazonaws.com [35.166.182.171]) by smtp-out-n05.prod.us-east-1.postgun.com with SMTP id 6079cbb3c39407c327a2a2fe (version=TLS1.2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256); Fri, 16 Apr 2021 17:38:59 GMT Sender: khsieh=codeaurora.org@mg.codeaurora.org Received: by smtp.codeaurora.org (Postfix, from userid 1001) id F2878C433C6; Fri, 16 Apr 2021 17:38:58 +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 DE833C433CA; Fri, 16 Apr 2021 17:38:57 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org DE833C433CA 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: robdclark@gmail.com, sean@poorly.run, swboyd@chromium.org Cc: abhinavk@codeaurora.org, aravindh@codeaurora.org, khsieh@codeaurora.org, airlied@linux.ie, daniel@ffwll.ch, linux-arm-msm@vger.kernel.org, dri-devel@lists.freedesktop.org, freedreno@lists.freedesktop.org, linux-kernel@vger.kernel.org Subject: [PATCH v3 3/3] drm/msm/dp: check main link status before start aux read Date: Fri, 16 Apr 2021 10:38:51 -0700 Message-Id: <1618594731-556-1-git-send-email-khsieh@codeaurora.org> X-Mailer: git-send-email 2.7.4 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org Maybe when the cable is disconnected the DP phy should be shutdown and some bit in the phy could effectively "cut off" the aux channel and then NAKs would start coming through here in the DP controller I/O register space. This patch have DP aux channel read/write to return NAK immediately if DP controller connection status is in unplugged state. Changes in V3: -- check core_initialized before handle irq_hpd Signed-off-by: Kuogee Hsieh --- drivers/gpu/drm/msm/dp/dp_aux.c | 5 +++++ drivers/gpu/drm/msm/dp/dp_display.c | 14 ++++++++++---- drivers/gpu/drm/msm/dp/dp_link.c | 20 +++++++++++++++----- 3 files changed, 30 insertions(+), 9 deletions(-) diff --git a/drivers/gpu/drm/msm/dp/dp_aux.c b/drivers/gpu/drm/msm/dp/dp_aux.c index 7c22bfe..fae3806 100644 --- a/drivers/gpu/drm/msm/dp/dp_aux.c +++ b/drivers/gpu/drm/msm/dp/dp_aux.c @@ -343,6 +343,11 @@ static ssize_t dp_aux_transfer(struct drm_dp_aux *dp_aux, mutex_lock(&aux->mutex); + if (!dp_catalog_link_is_connected(aux->catalog)) { + ret = -ETIMEDOUT; + goto unlock_exit; + } + aux->native = msg->request & (DP_AUX_NATIVE_WRITE & DP_AUX_NATIVE_READ); /* Ignore address only message */ diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c index 1784e11..db3f45e 100644 --- a/drivers/gpu/drm/msm/dp/dp_display.c +++ b/drivers/gpu/drm/msm/dp/dp_display.c @@ -571,7 +571,7 @@ static int dp_hpd_plug_handle(struct dp_display_private *dp, u32 data) dp->hpd_state = ST_DISCONNECTED; if (ret == -ECONNRESET) { /* cable unplugged */ - dp->core_initialized = false; + DRM_ERROR("dongle unplugged = %d\n", ret); } } else { @@ -711,9 +711,15 @@ static int dp_irq_hpd_handle(struct dp_display_private *dp, u32 data) return 0; } - ret = dp_display_usbpd_attention_cb(&dp->pdev->dev); - if (ret == -ECONNRESET) { /* cable unplugged */ - dp->core_initialized = false; + /* + * dp core (ahb/aux clks) must be initialized before + * irq_hpd be handled + */ + if (dp->core_initialized) { + ret = dp_display_usbpd_attention_cb(&dp->pdev->dev); + if (ret == -ECONNRESET) { /* cable unplugged */ + DRM_ERROR("dongle unplugged = %d\n", ret); + } } mutex_unlock(&dp->event_mutex); diff --git a/drivers/gpu/drm/msm/dp/dp_link.c b/drivers/gpu/drm/msm/dp/dp_link.c index be986da..53ecae6 100644 --- a/drivers/gpu/drm/msm/dp/dp_link.c +++ b/drivers/gpu/drm/msm/dp/dp_link.c @@ -737,18 +737,25 @@ static int dp_link_parse_sink_count(struct dp_link *dp_link) return 0; } -static void dp_link_parse_sink_status_field(struct dp_link_private *link) +static int dp_link_parse_sink_status_field(struct dp_link_private *link) { int len = 0; link->prev_sink_count = link->dp_link.sink_count; - dp_link_parse_sink_count(&link->dp_link); + len = dp_link_parse_sink_count(&link->dp_link); + if (len < 0) { + DRM_ERROR("DP parse sink count failed\n"); + return len; + } len = drm_dp_dpcd_read_link_status(link->aux, link->link_status); - if (len < DP_LINK_STATUS_SIZE) + if (len < DP_LINK_STATUS_SIZE) { DRM_ERROR("DP link status read failed\n"); - dp_link_parse_request(link); + return len; + } + + return dp_link_parse_request(link); } /** @@ -1032,7 +1039,10 @@ int dp_link_process_request(struct dp_link *dp_link) dp_link_reset_data(link); - dp_link_parse_sink_status_field(link); + ret = dp_link_parse_sink_status_field(link); + if (ret) { + return ret; + } if (link->request.test_requested == DP_TEST_LINK_EDID_READ) { dp_link->sink_request |= DP_TEST_LINK_EDID_READ;