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=-9.1 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE, SPF_PASS,T_DKIMWL_WL_HIGH,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 D4A3EC28CC1 for ; Sat, 1 Jun 2019 13:22:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A4DB7240D6 for ; Sat, 1 Jun 2019 13:22:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1559395372; bh=Au6V8N1tGmfWzLGZV8cy65ZWNYgqrGSrVTj21xNZJog=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=MDRHff3ipnVavynYYA2AMutcQmpf8+n7YGIozBlpll90xr3aoXEFUXuLbKreiDpX/ n+awy29EzrzxxWKqeaNexblOxqqzv7gQDnJRYunYMd7hjgGSJF1BJ5tPMXit3Ob5kt yrV7nK48Fu1k45kE+FrmdP+L4WJJdW0Ev0RRcEgQ= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728839AbfFANWv (ORCPT ); Sat, 1 Jun 2019 09:22:51 -0400 Received: from mail.kernel.org ([198.145.29.99]:52500 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728442AbfFANWt (ORCPT ); Sat, 1 Jun 2019 09:22:49 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 9C89C240D6; Sat, 1 Jun 2019 13:22:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1559395369; bh=Au6V8N1tGmfWzLGZV8cy65ZWNYgqrGSrVTj21xNZJog=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=D0LuuukeUzJy/n+nUjSZD4ZuAb4/vcPslNjEYL/YA9oNXCQwfJ3BIbYuoTLNOmfk/ F0wUBl4s5P2kfM3YekoDoCnrpDSYN2bsF5pIBJUsV0JzolqRbtyixv9NYUN7B4lvTg 1Zqdm7g4B4zfCfOqYg6JGEd/jf1xdB3UZGdMfVAY= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Ben Skeggs , Sasha Levin , dri-devel@lists.freedesktop.org, nouveau@lists.freedesktop.org Subject: [PATCH AUTOSEL 4.19 021/141] drm/nouveau/disp/dp: respect sink limits when selecting failsafe link configuration Date: Sat, 1 Jun 2019 09:19:57 -0400 Message-Id: <20190601132158.25821-21-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190601132158.25821-1-sashal@kernel.org> References: <20190601132158.25821-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Ben Skeggs [ Upstream commit 13d03e9daf70dab032c03dc172e75bb98ad899c4 ] Where possible, we want the failsafe link configuration (one which won't hang the OR during modeset because of not enough bandwidth for the mode) to also be supported by the sink. This prevents "link rate unsupported by sink" messages when link training fails. Signed-off-by: Ben Skeggs Signed-off-by: Sasha Levin --- drivers/gpu/drm/nouveau/nvkm/engine/disp/dp.c | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/disp/dp.c b/drivers/gpu/drm/nouveau/nvkm/engine/disp/dp.c index 5f301e632599b..818d21bd28d31 100644 --- a/drivers/gpu/drm/nouveau/nvkm/engine/disp/dp.c +++ b/drivers/gpu/drm/nouveau/nvkm/engine/disp/dp.c @@ -365,8 +365,15 @@ nvkm_dp_train(struct nvkm_dp *dp, u32 dataKBps) * and it's better to have a failed modeset than that. */ for (cfg = nvkm_dp_rates; cfg->rate; cfg++) { - if (cfg->nr <= outp_nr && cfg->nr <= outp_bw) - failsafe = cfg; + if (cfg->nr <= outp_nr && cfg->nr <= outp_bw) { + /* Try to respect sink limits too when selecting + * lowest link configuration. + */ + if (!failsafe || + (cfg->nr <= sink_nr && cfg->bw <= sink_bw)) + failsafe = cfg; + } + if (failsafe && cfg[1].rate < dataKBps) break; } -- 2.20.1