From patchwork Mon Jul 19 14:50:44 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 12386121 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=-16.5 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,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 E23B9C07E9B for ; Mon, 19 Jul 2021 15:52:36 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id AD1466128D for ; Mon, 19 Jul 2021 15:52:36 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org AD1466128D Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linuxfoundation.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=dri-devel-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id C051089D7B; Mon, 19 Jul 2021 15:52:35 +0000 (UTC) Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by gabe.freedesktop.org (Postfix) with ESMTPS id 643DE89CF9 for ; Mon, 19 Jul 2021 15:52:34 +0000 (UTC) Received: by mail.kernel.org (Postfix) with ESMTPSA id C2CF96127C; Mon, 19 Jul 2021 15:52:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1626709954; bh=lTQAdoT+A2R5QcppUh7z770vJdI+rfGpo1UKuzMDMIc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=WVBdMSqRYr1IGdALubhbC87PnFzNzPVXpjByr6aMCcZpSr1+0pgA6WUDDHy9PsSg6 R8HlRH8YphAdl8/1E4O4mkSrHvSfg+uf/KxSKYKCo905zZTtkFrdxmBJPGfayvEvaU +PXO30jgwf60lxV7/fcDFFqIYfCrqtNWUkbTm0FM= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Subject: [PATCH 5.10 015/243] drm/dp_mst: Do not set proposed vcpi directly Date: Mon, 19 Jul 2021 16:50:44 +0200 Message-Id: <20210719144941.413511279@linuxfoundation.org> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210719144940.904087935@linuxfoundation.org> References: <20210719144940.904087935@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Greg Kroah-Hartman , dri-devel@lists.freedesktop.org, stable@vger.kernel.org, Thomas Zimmermann , Wayne Lin Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" From: Wayne Lin commit 35d3e8cb35e75450f87f87e3d314e2d418b6954b upstream. [Why] When we receive CSN message to notify one port is disconnected, we will implicitly set its corresponding num_slots to 0. Later on, we will eventually call drm_dp_update_payload_part1() to arrange down streams. In drm_dp_update_payload_part1(), we iterate over all proposed_vcpis[] to do the update. Not specific to a target sink only. For example, if we light up 2 monitors, Monitor_A and Monitor_B, and then we unplug Monitor_B. Later on, when we call drm_dp_update_payload_part1() to try to update payload for Monitor_A, we'll also implicitly clean payload for Monitor_B at the same time. And finally, when we try to call drm_dp_update_payload_part1() to clean payload for Monitor_B, we will do nothing at this time since payload for Monitor_B has been cleaned up previously. For StarTech 1to3 DP hub, it seems like if we didn't update DPCD payload ID table then polling for "ACT Handled"(BIT_1 of DPCD 002C0h) will fail and this polling will last for 3 seconds. Therefore, guess the best way is we don't set the proposed_vcpi[] diretly. Let user of these herlper functions to set the proposed_vcpi directly. [How] 1. Revert commit 7617e9621bf2 ("drm/dp_mst: clear time slots for ports invalid") 2. Tackle the issue in previous commit by skipping those trasient proposed VCPIs. These stale VCPIs shoulde be explicitly cleared by user later on. Changes since v1: * Change debug macro to use drm_dbg_kms() instead * Amend the commit message to add Fixed & Cc tags Signed-off-by: Wayne Lin Fixes: 7617e9621bf2 ("drm/dp_mst: clear time slots for ports invalid") Cc: Lyude Paul Cc: Wayne Lin Cc: Maarten Lankhorst Cc: Maxime Ripard Cc: Thomas Zimmermann Cc: dri-devel@lists.freedesktop.org Cc: # v5.5+ Signed-off-by: Lyude Paul Link: https://patchwork.freedesktop.org/patch/msgid/20210616035501.3776-2-Wayne.Lin@amd.com Reviewed-by: Lyude Paul Signed-off-by: Greg Kroah-Hartman --- drivers/gpu/drm/drm_dp_mst_topology.c | 36 +++++++++------------------------- 1 file changed, 10 insertions(+), 26 deletions(-) --- a/drivers/gpu/drm/drm_dp_mst_topology.c +++ b/drivers/gpu/drm/drm_dp_mst_topology.c @@ -2499,7 +2499,7 @@ drm_dp_mst_handle_conn_stat(struct drm_d { struct drm_dp_mst_topology_mgr *mgr = mstb->mgr; struct drm_dp_mst_port *port; - int old_ddps, old_input, ret, i; + int old_ddps, ret; u8 new_pdt; bool new_mcs; bool dowork = false, create_connector = false; @@ -2531,7 +2531,6 @@ drm_dp_mst_handle_conn_stat(struct drm_d } old_ddps = port->ddps; - old_input = port->input; port->input = conn_stat->input_port; port->ldps = conn_stat->legacy_device_plug_status; port->ddps = conn_stat->displayport_device_plug_status; @@ -2554,28 +2553,6 @@ drm_dp_mst_handle_conn_stat(struct drm_d dowork = false; } - if (!old_input && old_ddps != port->ddps && !port->ddps) { - for (i = 0; i < mgr->max_payloads; i++) { - struct drm_dp_vcpi *vcpi = mgr->proposed_vcpis[i]; - struct drm_dp_mst_port *port_validated; - - if (!vcpi) - continue; - - port_validated = - container_of(vcpi, struct drm_dp_mst_port, vcpi); - port_validated = - drm_dp_mst_topology_get_port_validated(mgr, port_validated); - if (!port_validated) { - mutex_lock(&mgr->payload_lock); - vcpi->num_slots = 0; - mutex_unlock(&mgr->payload_lock); - } else { - drm_dp_mst_topology_put_port(port_validated); - } - } - } - if (port->connector) drm_modeset_unlock(&mgr->base.lock); else if (create_connector) @@ -3406,8 +3383,15 @@ int drm_dp_update_payload_part1(struct d port = drm_dp_mst_topology_get_port_validated( mgr, port); if (!port) { - mutex_unlock(&mgr->payload_lock); - return -EINVAL; + if (vcpi->num_slots == payload->num_slots) { + cur_slots += vcpi->num_slots; + payload->start_slot = req_payload.start_slot; + continue; + } else { + drm_dbg_kms("Fail:set payload to invalid sink"); + mutex_unlock(&mgr->payload_lock); + return -EINVAL; + } } put_port = true; }