From patchwork Thu Dec 23 00:53:45 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kuogee Hsieh X-Patchwork-Id: 12697711 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 F1F3EC433EF for ; Thu, 23 Dec 2021 00:53:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238669AbhLWAx5 (ORCPT ); Wed, 22 Dec 2021 19:53:57 -0500 Received: from alexa-out.qualcomm.com ([129.46.98.28]:7490 "EHLO alexa-out.qualcomm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238150AbhLWAx5 (ORCPT ); Wed, 22 Dec 2021 19:53:57 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; i=@quicinc.com; q=dns/txt; s=qcdkim; t=1640220836; x=1671756836; h=from:to:cc:subject:date:message-id:mime-version; bh=ZsgLJndpLvwXmWTrpAtIHRV7ZxELnn8+rKqh9Mjotck=; b=LmxV4VhyN03+n6d4J5IUxqi4b1mMyfuezZOaAx+GbubEQ97qFB32Da+t TWoQ0D9sKfM3Od1z1Nvc/HNkeK6rClGjF3HwWstfWOHmz1U3ErbCsFcy+ sTNrQPKKQvL4bFYpTcrdLiPU//v+/ugD+Ok79XTcXxArYYYIa7Of+7VFA M=; Received: from ironmsg07-lv.qualcomm.com ([10.47.202.151]) by alexa-out.qualcomm.com with ESMTP; 22 Dec 2021 16:53:55 -0800 X-QCInternal: smtphost Received: from nasanex01c.na.qualcomm.com ([10.47.97.222]) by ironmsg07-lv.qualcomm.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Dec 2021 16:53:55 -0800 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 15.2.922.19; Wed, 22 Dec 2021 16:53:54 -0800 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 15.2.922.19; Wed, 22 Dec 2021 16:53:53 -0800 From: Kuogee Hsieh To: , , , , , , , , CC: , , , , , , , Subject: [PATCH v9 1/2] drm/msm/dp: dp_link_parse_sink_count() return immediately if aux read failed Date: Wed, 22 Dec 2021 16:53:45 -0800 Message-ID: <1640220825-25223-1-git-send-email-quic_khsieh@quicinc.com> X-Mailer: git-send-email 2.7.4 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 Add checking aux read/write status at both dp_link_parse_sink_count() and dp_link_parse_sink_status_filed() to avoid long timeout delay if dp aux read/write failed at timeout due to cable unplugged. Also make sure dp controller had been initialized before start dpcd read and write. Changes in V4: -- split this patch as stand alone patch Changes in v5: -- rebase on msm-next branch Changes in v6: -- add more details commit text Signed-off-by: Kuogee Hsieh Reviewed-by: Stephen Boyd Tested-by: Stephen Boyd --- drivers/gpu/drm/msm/dp/dp_display.c | 12 +++++++++--- drivers/gpu/drm/msm/dp/dp_link.c | 19 ++++++++++++++----- 2 files changed, 23 insertions(+), 8 deletions(-) diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c index 3d61459..0766752 100644 --- a/drivers/gpu/drm/msm/dp/dp_display.c +++ b/drivers/gpu/drm/msm/dp/dp_display.c @@ -692,9 +692,15 @@ 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 */ + dp->core_initialized = false; + } } DRM_DEBUG_DP("hpd_state=%d\n", state); diff --git a/drivers/gpu/drm/msm/dp/dp_link.c b/drivers/gpu/drm/msm/dp/dp_link.c index a5bdfc5..d4d31e5 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); } /** @@ -1023,7 +1030,9 @@ 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;