From mboxrd@z Thu Jan 1 00:00:00 1970 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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,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 889B6C433E0 for ; Tue, 26 May 2020 19:12:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 61D71208A7 for ; Tue, 26 May 2020 19:12:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1590520371; bh=xNxWuxJz2HZvdmUmAa0zl9AQCLtbYo9SEzWFm3xSK0A=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=S4Pvl2sk1WQcey5UjSE6RCEFbE8SdcgPCKnc3wWDDgC+YLkr6kEyO7wYhY9AjDYXe OZCY64pISTPw20Y6OoTkk4RPmaNpcIjbyYZNAEqXrVY+l1Eg6ZTvweD4G8C0TSpjtO xmEnEdFAVjUNBveNsyYDWPG1czwMtIHu3dqdkr10= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2391903AbgEZTMu (ORCPT ); Tue, 26 May 2020 15:12:50 -0400 Received: from mail.kernel.org ([198.145.29.99]:42410 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2392124AbgEZTMr (ORCPT ); Tue, 26 May 2020 15:12:47 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 6272E208A7; Tue, 26 May 2020 19:12:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1590520366; bh=xNxWuxJz2HZvdmUmAa0zl9AQCLtbYo9SEzWFm3xSK0A=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=cE7RAXkE3ZtkbRsg38ukl8J4eLjHmQSw2/6mwWklnJs5/nKdcM927MC/CRnQ9oWYl jUsUMdOOBqGKvU9Dvxk0nzNqiMZGD/XYauzJo5auZ6R270D2n08fPc5Lp/EYuQTLAq O0u+8TbldDykeb1P31rpXXgRMnqAlYIpLzojHpZs= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Aurabindo Pillai , Harry Wentland , Alex Deucher , Sasha Levin Subject: [PATCH 5.6 051/126] drm/amd/display: Prevent dpcd reads with passive dongles Date: Tue, 26 May 2020 20:53:08 +0200 Message-Id: <20200526183942.332706715@linuxfoundation.org> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200526183937.471379031@linuxfoundation.org> References: <20200526183937.471379031@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Aurabindo Pillai [ Upstream commit e6142dd511425cb827b5db869f489eb81f5f994d ] [why] During hotplug, a DP port may be connected to the sink through passive adapter which does not support DPCD reads. Issuing reads without checking for this condition will result in errors [how] Ensure the link is in aux_mode before initiating operation that result in a DPCD read. Signed-off-by: Aurabindo Pillai Reviewed-by: Harry Wentland Acked-by: Aurabindo Pillai Signed-off-by: Alex Deucher Signed-off-by: Sasha Levin --- .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 17 +++++++++++------ 1 file changed, 11 insertions(+), 6 deletions(-) diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c index 5e27a67fbc58..0cd11d3d4cf4 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c @@ -1941,17 +1941,22 @@ amdgpu_dm_update_connector_after_detect(struct amdgpu_dm_connector *aconnector) dc_sink_retain(aconnector->dc_sink); if (sink->dc_edid.length == 0) { aconnector->edid = NULL; - drm_dp_cec_unset_edid(&aconnector->dm_dp_aux.aux); + if (aconnector->dc_link->aux_mode) { + drm_dp_cec_unset_edid( + &aconnector->dm_dp_aux.aux); + } } else { aconnector->edid = - (struct edid *) sink->dc_edid.raw_edid; - + (struct edid *)sink->dc_edid.raw_edid; drm_connector_update_edid_property(connector, - aconnector->edid); - drm_dp_cec_set_edid(&aconnector->dm_dp_aux.aux, - aconnector->edid); + aconnector->edid); + + if (aconnector->dc_link->aux_mode) + drm_dp_cec_set_edid(&aconnector->dm_dp_aux.aux, + aconnector->edid); } + amdgpu_dm_update_freesync_caps(connector, aconnector->edid); } else { -- 2.25.1