From patchwork Sat Jan 15 00:58:33 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kuogee Hsieh X-Patchwork-Id: 12714262 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 DD102C43219 for ; Sat, 15 Jan 2022 00:59:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231682AbiAOA7C (ORCPT ); Fri, 14 Jan 2022 19:59:02 -0500 Received: from alexa-out.qualcomm.com ([129.46.98.28]:14861 "EHLO alexa-out.qualcomm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231666AbiAOA7A (ORCPT ); Fri, 14 Jan 2022 19:59:00 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; i=@quicinc.com; q=dns/txt; s=qcdkim; t=1642208340; x=1673744340; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version; bh=aHnFHFh68kfU2VzllW4SeOtJ3jBEvTM/T5LQRp8gB9I=; b=SdQB0eyZAGsjWjujSTr5W20Y+BtjznAwsrgTX6oMM1nlgcOrXje7piBV d5U4jrDWe4WuwUBD+1zTPdLpdABOzSLOhcGeqaBG9UDsV/PmGosyXQSQz +RybOFRoW8thlJv2Ndhm46zUJU9TrlT7mwlDq7nJfHW/roQvJK/jMzn+q 8=; Received: from ironmsg-lv-alpha.qualcomm.com ([10.47.202.13]) by alexa-out.qualcomm.com with ESMTP; 14 Jan 2022 16:58:59 -0800 X-QCInternal: smtphost Received: from nasanex01c.na.qualcomm.com ([10.47.97.222]) by ironmsg-lv-alpha.qualcomm.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 14 Jan 2022 16:58:58 -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; Fri, 14 Jan 2022 16:58:49 -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; Fri, 14 Jan 2022 16:58:48 -0800 From: Kuogee Hsieh To: , , , , , , , , , CC: Kuogee Hsieh , , , , , , Subject: [PATCH v17 2/4] drm/msm/dp: populate connector of struct dp_panel Date: Fri, 14 Jan 2022 16:58:33 -0800 Message-ID: <1642208315-9136-3-git-send-email-quic_khsieh@quicinc.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1642208315-9136-1-git-send-email-quic_khsieh@quicinc.com> References: <1642208315-9136-1-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 DP CTS test case 4.2.2.6 has valid edid with bad checksum on purpose and expect DP source return correct checksum. During drm edid read, correct edid checksum is calculated and stored at connector::real_edid_checksum. The problem is struct dp_panel::connector never be assigned, instead the connector is stored in struct msm_dp::connector. When we run compliance testing test case 4.2.2.6 dp_panel_handle_sink_request() won't have a valid edid set in struct dp_panel::edid so we'll try to use the connectors real_edid_checksum and hit a NULL pointer dereference error because the connector pointer is never assigned. Changes in V2: -- populate panel connector at msm_dp_modeset_init() instead of at dp_panel_read_sink_caps() Changes in V3: -- remove unhelpful kernel crash trace commit text -- remove renaming dp_display parameter to dp Changes in V4: -- add more details to commit text Changes in v10: -- group into one series Changes in v11: -- drop drm/msm/dp: dp_link_parse_sink_count() return immediately if aux read Fixes: 7948fe12d47 ("drm/msm/dp: return correct edid checksum after corrupted edid checksum read") Signee-off-by: Kuogee Hsieh Reviewed-by: Bjorn Andersson Reviewed-by: Stephen Boyd --- drivers/gpu/drm/msm/dp/dp_display.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c index 5fc90971..9803663 100644 --- a/drivers/gpu/drm/msm/dp/dp_display.c +++ b/drivers/gpu/drm/msm/dp/dp_display.c @@ -1465,6 +1465,7 @@ int msm_dp_modeset_init(struct msm_dp *dp_display, struct drm_device *dev, struct drm_encoder *encoder) { struct msm_drm_private *priv; + struct dp_display_private *dp_priv; int ret; if (WARN_ON(!encoder) || WARN_ON(!dp_display) || WARN_ON(!dev)) @@ -1473,6 +1474,8 @@ int msm_dp_modeset_init(struct msm_dp *dp_display, struct drm_device *dev, priv = dev->dev_private; dp_display->drm_dev = dev; + dp_priv = container_of(dp_display, struct dp_display_private, dp_display); + ret = dp_display_request_irq(dp_display); if (ret) { DRM_ERROR("request_irq failed, ret=%d\n", ret); @@ -1490,6 +1493,8 @@ int msm_dp_modeset_init(struct msm_dp *dp_display, struct drm_device *dev, return ret; } + dp_priv->panel->connector = dp_display->connector; + priv->connectors[priv->num_connectors++] = dp_display->connector; dp_display->bridge = msm_dp_bridge_init(dp_display, dev, encoder);