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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9C259C001B2 for ; Wed, 14 Dec 2022 18:43:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238879AbiLNSnG (ORCPT ); Wed, 14 Dec 2022 13:43:06 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55762 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237958AbiLNSnE (ORCPT ); Wed, 14 Dec 2022 13:43:04 -0500 Received: from mga03.intel.com (mga03.intel.com [134.134.136.65]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 414802A708 for ; Wed, 14 Dec 2022 10:43:03 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1671043383; x=1702579383; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=qIB+IG0nRJcAUz4HQIXON8xBXAnSiGfKuP+C3Av1YeQ=; b=GU07VcHScL4YyQEk8YjfAJM/spw5YnUs5722D2zBtQxLh7weHCkrKSw4 rnT8eL/nYoRcEfylxX/v0UIfcRMzz/mFVICqAQcEvmsri77zIPI3TDLUB v7TU8azY3acCqTxTx29jwJvrvCuX68g3KEcB9SH1rlEqgKXPT52DlVl+9 ftuICMH/jsdHhBRsYubwA5MczUJrO9TgvSewDZho25wo9YnGE+fZu/Nx0 jkQLs4Up6540odpA/w9J79O4X19duGokusunjCgQNsPy+Vob0hM7o+tu9 1ZumSfuGOzPHWoL0wB9YzU2uSiPLUC6UfI0syKWlBelVVJvNTBPdzkKnP w==; X-IronPort-AV: E=McAfee;i="6500,9779,10561"; a="320343546" X-IronPort-AV: E=Sophos;i="5.96,245,1665471600"; d="scan'208";a="320343546" Received: from fmsmga006.fm.intel.com ([10.253.24.20]) by orsmga103.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 14 Dec 2022 10:43:02 -0800 X-IronPort-AV: E=McAfee;i="6500,9779,10561"; a="894424793" X-IronPort-AV: E=Sophos;i="5.96,245,1665471600"; d="scan'208";a="894424793" Received: from ideak-desk.fi.intel.com ([10.237.72.58]) by fmsmga006-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 14 Dec 2022 10:43:00 -0800 From: Imre Deak To: intel-gfx@lists.freedesktop.org Cc: dri-devel@lists.freedesktop.org, Lyude Paul , stable@vger.kernel.org Subject: [PATCH 1/3] drm/display/dp_mst: Fix down/up message handling after sink disconnect Date: Wed, 14 Dec 2022 20:42:56 +0200 Message-Id: <20221214184258.2869417-1-imre.deak@intel.com> X-Mailer: git-send-email 2.31.1.189.g2e36527f23 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org If the sink gets disconnected during receiving a multi-packet DP MST AUX down-reply/up-request sideband message, the state keeping track of which packets have been received already is not reset. This results in a failed sanity check for the subsequent message packet received after a sink is reconnected (due to the pending message not yet completed with an end-of-message-transfer packet), indicated by the "sideband msg set header failed" error. Fix the above by resetting the up/down message reception state after a disconnect event. Cc: Lyude Paul Cc: # v3.17+ Signed-off-by: Imre Deak --- drivers/gpu/drm/display/drm_dp_mst_topology.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/gpu/drm/display/drm_dp_mst_topology.c b/drivers/gpu/drm/display/drm_dp_mst_topology.c index 51a46689cda70..90819fff2c9ba 100644 --- a/drivers/gpu/drm/display/drm_dp_mst_topology.c +++ b/drivers/gpu/drm/display/drm_dp_mst_topology.c @@ -3641,6 +3641,9 @@ int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool ms drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, 0); ret = 0; mgr->payload_id_table_cleared = false; + + memset(&mgr->down_rep_recv, 0, sizeof(mgr->down_rep_recv)); + memset(&mgr->up_req_recv, 0, sizeof(mgr->up_req_recv)); } out_unlock: -- 2.37.1