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=-7.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS 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 10094C43612 for ; Tue, 8 Jan 2019 21:11:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D8A9920675 for ; Tue, 8 Jan 2019 21:11:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729765AbfAHVLw (ORCPT ); Tue, 8 Jan 2019 16:11:52 -0500 Received: from mx1.redhat.com ([209.132.183.28]:46610 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728313AbfAHVLv (ORCPT ); Tue, 8 Jan 2019 16:11:51 -0500 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 8710D5D68A; Tue, 8 Jan 2019 21:11:50 +0000 (UTC) Received: from malachite.bss.redhat.com (dhcp-10-20-1-11.bss.redhat.com [10.20.1.11]) by smtp.corp.redhat.com (Postfix) with ESMTP id 397311992A; Tue, 8 Jan 2019 21:11:46 +0000 (UTC) From: Lyude Paul To: dri-devel@lists.freedesktop.org, amd-gfx@lists.freedesktop.org Cc: Harry Wentland , Jerry Zuo , stable@vger.kernel.org, Leo Li , Alex Deucher , =?UTF-8?q?Christian=20K=C3=B6nig?= , "David (ChunMing) Zhou" , David Airlie , Daniel Vetter , Tony Cheng , David Francis , Nicholas Kazlauskas , Mikita Lipski , Bhawanpreet Lakha , Anthony Koo , linux-kernel@vger.kernel.org Subject: [PATCH v2 1/3] drm/amdgpu: Don't ignore rc from drm_dp_mst_topology_mgr_resume() Date: Tue, 8 Jan 2019 16:11:27 -0500 Message-Id: <20190108211133.32564-2-lyude@redhat.com> In-Reply-To: <20190108211133.32564-1-lyude@redhat.com> References: <20190108211133.32564-1-lyude@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.39]); Tue, 08 Jan 2019 21:11:50 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org drm_dp_mst_topology_mgr_resume() returns whether or not it managed to find the topology in question after a suspend resume cycle, and the driver is supposed to check this value and disable MST accordingly if it's gone-in addition to sending a hotplug in order to notify userspace that something changed during suspend. Currently, amdgpu just makes the mistake of ignoring the return code from drm_dp_mst_topology_mgr_resume() which means that if a topology was removed in suspend, amdgpu never notices and assumes it's still connected which leads to all sorts of problems. So, fix this by actually checking the rc from drm_dp_mst_topology_mgr_resume(). Also, reformat the rest of the function while we're at it to fix the over-indenting. Signed-off-by: Lyude Paul Reviewed-by: Harry Wentland Cc: Jerry Zuo Cc: # v4.15+ --- .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 32 +++++++++++++------ 1 file changed, 23 insertions(+), 9 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 8a626d16e8e3..3f326a2c513b 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c @@ -699,22 +699,36 @@ static void s3_handle_mst(struct drm_device *dev, bool suspend) { struct amdgpu_dm_connector *aconnector; struct drm_connector *connector; + struct drm_dp_mst_topology_mgr *mgr; + int ret; + bool need_hotplug = false; drm_modeset_lock(&dev->mode_config.connection_mutex, NULL); - list_for_each_entry(connector, &dev->mode_config.connector_list, head) { - aconnector = to_amdgpu_dm_connector(connector); - if (aconnector->dc_link->type == dc_connection_mst_branch && - !aconnector->mst_port) { + list_for_each_entry(connector, &dev->mode_config.connector_list, + head) { + aconnector = to_amdgpu_dm_connector(connector); + if (aconnector->dc_link->type != dc_connection_mst_branch || + aconnector->mst_port) + continue; + + mgr = &aconnector->mst_mgr; - if (suspend) - drm_dp_mst_topology_mgr_suspend(&aconnector->mst_mgr); - else - drm_dp_mst_topology_mgr_resume(&aconnector->mst_mgr); - } + if (suspend) { + drm_dp_mst_topology_mgr_suspend(mgr); + } else { + ret = drm_dp_mst_topology_mgr_resume(mgr); + if (ret < 0) { + drm_dp_mst_topology_mgr_set_mst(mgr, false); + need_hotplug = true; + } + } } drm_modeset_unlock(&dev->mode_config.connection_mutex); + + if (need_hotplug) + drm_kms_helper_hotplug_event(dev); } /** -- 2.20.1