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 44E6AC6FD1C for ; Sat, 25 Mar 2023 00:44:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231786AbjCYAoB (ORCPT ); Fri, 24 Mar 2023 20:44:01 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39956 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229522AbjCYAoA (ORCPT ); Fri, 24 Mar 2023 20:44:00 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6F4E812B for ; Fri, 24 Mar 2023 17:43:59 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 0AE5562CBE for ; Sat, 25 Mar 2023 00:43:59 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4ABFDC4339B; Sat, 25 Mar 2023 00:43:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1679705038; bh=ihBZF/k16R/76bFJyJVD9mgzyhOUdAU1Qu40u0IqigI=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=OugUOpHKvRFNAeW7b7paZUL+Kl7DmS4Gjjttov5/7nfATO2MkpQcgPEdGjgoX77Ct /KZBKxGiuU/kJlZ/5274AWDwAvkG0p7gEfcMQnvUCMaC/tDdCFDcjVF/sVCee2d3Xy gHNWOLZBhglLlHG8AHKtYmjfBvyrnL1/CFYuQaOXMtQXKR7Hd5TyJeOIV8s7pevaVC YzeTLjggq6/doDug+SIMkfYJstwSlAZjJzv8MocvAvFQ1E0w4x1gENT+8hnXgj7QkM 8fvFgxDmikRtww8wRHMzCbH/YXdQb5R+c+7JBOkfx9HPUWa0omEWxEe20AX1fU9SG0 vi2TViwfGaNMw== Date: Fri, 24 Mar 2023 20:43:57 -0400 From: Sasha Levin To: Mario Limonciello Cc: stable@vger.kernel.org, Cruise Hung , Wenjing Liu , Qingqing Zhuo , Daniel Wheeler , Alex Deucher Subject: Re: [PATCH 6.2.y/6.1.y 1/1] drm/amd/display: Fix DP MST sinks removal issue Message-ID: References: <20230322220841.898-1-mario.limonciello@amd.com> <20230322220841.898-2-mario.limonciello@amd.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Disposition: inline In-Reply-To: <20230322220841.898-2-mario.limonciello@amd.com> Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org On Wed, Mar 22, 2023 at 05:08:41PM -0500, Mario Limonciello wrote: >From: Cruise Hung > >[Why] >In USB4 DP tunneling, it's possible to have this scenario that >the path becomes unavailable and CM tears down the path a little bit late. >So, in this case, the HPD is high but fails to read any DPCD register. >That causes the link connection type to be set to sst. >And not all sinks are removed behind the MST branch. > >[How] >Restore the link connection type if it fails to read DPCD register. > >Cc: stable@vger.kernel.org >Cc: Mario Limonciello >Reviewed-by: Wenjing Liu >Acked-by: Qingqing Zhuo >Signed-off-by: Cruise Hung >Tested-by: Daniel Wheeler >Signed-off-by: Alex Deucher >(cherry picked from commit cbd6c1b17d3b42b7935526a86ad5f66838767d03) >Modified for stable backport as a lot of the code in this file was moved >in 6.3 to drivers/gpu/drm/amd/display/dc/link/link_detection.c. >Signed-off-by: Mario Limonciello Queued up, thanks! -- Thanks, Sasha