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 2ABDFEEB56C for ; Fri, 8 Sep 2023 19:34:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242259AbjIHTfA (ORCPT ); Fri, 8 Sep 2023 15:35:00 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54106 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1344986AbjIHTew (ORCPT ); Fri, 8 Sep 2023 15:34:52 -0400 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C8E11E46; Fri, 8 Sep 2023 12:34:29 -0700 (PDT) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 10D16C433CC; Fri, 8 Sep 2023 19:33:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1694201601; bh=oFVOEI2vl5Izjjz2tJf5CFJD+of6q2SmaDV8PqTkO0g=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=nhWoFm44PFPA0AZ70ECVHgonDx5Sa1Pv5KjRDPKpS56n573kKEPX2O5fsuJnu3nbG eR29xxd24fK7AnqYZhkmHPhtTLMY5dGXxxMP405QSttiYQPlVojA9xFrzVmhGPrYTx v+83WqtKbgdNQ/uotuPem3bNgoawMUFtgLPitg+FG3/vBVV7bd76H2eWIm+znFPgc9 Dhb5cfNFa5vpMt+g4QIiXB+XnVioilGi3ACSSLUCpAJ8bI2mB+e4ql+lgiP8/VFbqt RXy+JrEhTfTDNZKSF+V2InE+ygjL05byBD3kty/eONG0QHwFZTHB5/RuR79ERqnI15 OLasl5LqEy0LA== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Austin Zheng , Alvin Lee , Tom Chung , Daniel Wheeler , Alex Deucher , Sasha Levin , harry.wentland@amd.com, sunpeng.li@amd.com, Rodrigo.Siqueira@amd.com, christian.koenig@amd.com, Xinhui.Pan@amd.com, airlied@gmail.com, daniel@ffwll.ch, qingqing.zhuo@amd.com, Syed.Hassan@amd.com, syedsaaem.rizvi@amd.com, hersenxs.wu@amd.com, jiapeng.chong@linux.alibaba.com, amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org Subject: [PATCH AUTOSEL 6.4 18/31] drm/amd/display: Use DTBCLK as refclk instead of DPREFCLK Date: Fri, 8 Sep 2023 15:31:47 -0400 Message-Id: <20230908193201.3462957-18-sashal@kernel.org> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20230908193201.3462957-1-sashal@kernel.org> References: <20230908193201.3462957-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 6.4.15 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Austin Zheng [ Upstream commit 4a30cc2bd281fa176a68b5305cd3695d636152ad ] [Why] Flash of corruption observed when UCLK switching after transitioning from DTBCLK to DPREFCLK on subVP(DP) + subVP(HDMI) config Scenario where DPREFCLK is required instead of DTBCLK is not expected [How] Always set the DTBCLK source as DTBCLK0 Reviewed-by: Alvin Lee Acked-by: Tom Chung Signed-off-by: Austin Zheng Tested-by: Daniel Wheeler Signed-off-by: Alex Deucher Signed-off-by: Sasha Levin --- drivers/gpu/drm/amd/display/dc/dcn32/dcn32_dccg.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_dccg.c b/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_dccg.c index ffbb739d85b69..8496ff4a25e35 100644 --- a/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_dccg.c +++ b/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_dccg.c @@ -290,7 +290,8 @@ static void dccg32_set_dpstreamclk( struct dcn_dccg *dccg_dcn = TO_DCN_DCCG(dccg); /* set the dtbclk_p source */ - dccg32_set_dtbclk_p_src(dccg, src, otg_inst); + /* always program refclk as DTBCLK. No use-case expected to require DPREFCLK as refclk */ + dccg32_set_dtbclk_p_src(dccg, DTBCLK0, otg_inst); /* enabled to select one of the DTBCLKs for pipe */ switch (dp_hpo_inst) { -- 2.40.1