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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id C9681C3ABBF for ; Mon, 5 May 2025 22:44:53 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 52E3E10E522; Mon, 5 May 2025 22:44:53 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=kernel.org header.i=@kernel.org header.b="FMIxcF+o"; dkim-atps=neutral Received: from tor.source.kernel.org (tor.source.kernel.org [172.105.4.254]) by gabe.freedesktop.org (Postfix) with ESMTPS id 6382310E525; Mon, 5 May 2025 22:44:51 +0000 (UTC) Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by tor.source.kernel.org (Postfix) with ESMTP id E459261F1B; Mon, 5 May 2025 22:44:18 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3656DC4CEE4; Mon, 5 May 2025 22:44:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1746485090; bh=LCnnPAWWj9dD4v3jedrgPS8PzuwhW6mTI4/VpNY/qZk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=FMIxcF+oIvruhNxU/yj2+dfsIgdH9OIVguARj99/Ceeeucwp2WitamSJX0GSYN9d3 lOiZy2DKvod7kDYWn9ndL4zzXT0XTtIh/AmE8M8oiSHgg18I/nKRSdICHIvKv5/zji +oFPVGUWwmAhMlLJkld4zRcHdoTUTu6Xc/Cs661y7PVj2Ry6Zn+XcKR9aT2KpezY08 csoJzZf2OzGCHCcuGyTSQcoTTLbELSDiLOS9GJ4RhGzqw3Sg8wgLTjarDaPM8DHNNZ gjIllpAiRqzPNNnykmsvH3GkWHrokrLwX3rz8HiSlXW0GaHNXI4eGeTIx1yBXKUJHR 4JK7JEBRTFWlg== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Peichen Huang , Cruise Hung , Meenakshikumar Somasundaram , Tom Chung , Daniel Wheeler , Alex Deucher , Sasha Levin , harry.wentland@amd.com, sunpeng.li@amd.com, christian.koenig@amd.com, airlied@gmail.com, simona@ffwll.ch, wenjing.liu@amd.com, alex.hung@amd.com, Jerry.Zuo@amd.com, michael.strauss@amd.com, Brendan.Tam@amd.com, ivlipski@amd.com, amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org Subject: [PATCH AUTOSEL 6.12 158/486] drm/amd/display: not abort link train when bw is low Date: Mon, 5 May 2025 18:33:54 -0400 Message-Id: <20250505223922.2682012-158-sashal@kernel.org> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20250505223922.2682012-1-sashal@kernel.org> References: <20250505223922.2682012-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 6.12.26 Content-Transfer-Encoding: 8bit X-BeenThere: amd-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Discussion list for AMD gfx List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: amd-gfx-bounces@lists.freedesktop.org Sender: "amd-gfx" From: Peichen Huang [ Upstream commit 8a21da2842bb22b2b80e5902d0438030d729bfd3 ] [WHY] DP tunneling should not abort link train even bandwidth become too low after downgrade. Otherwise, it would fail compliance test. [HOW} Do link train with downgrade settings even bandwidth is not enough Reviewed-by: Cruise Hung Reviewed-by: Meenakshikumar Somasundaram Signed-off-by: Peichen Huang Signed-off-by: Tom Chung Tested-by: Daniel Wheeler Signed-off-by: Alex Deucher Signed-off-by: Sasha Levin --- .../gpu/drm/amd/display/dc/link/protocols/link_dp_training.c | 5 +---- 1 file changed, 1 insertion(+), 4 deletions(-) diff --git a/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_training.c b/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_training.c index 27b881f947e8b..9385a32a471b8 100644 --- a/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_training.c +++ b/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_training.c @@ -1769,13 +1769,10 @@ bool perform_link_training_with_retries( is_link_bw_min = ((cur_link_settings.link_rate <= LINK_RATE_LOW) && (cur_link_settings.lane_count <= LANE_COUNT_ONE)); - if (is_link_bw_low) { + if (is_link_bw_low) DC_LOG_WARNING( "%s: Link(%d) bandwidth too low after fallback req_bw(%d) > link_bw(%d)\n", __func__, link->link_index, req_bw, link_bw); - - return false; - } } msleep(delay_between_attempts); -- 2.39.5