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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 BB282CD37BC for ; Sun, 10 May 2026 12:42:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=gm9b045IcG8DnAmjtTH+vKJGBcOWisBfLbs01XraJL4=; b=mEJdcFvsTkYrec 7hU9Slvfx+5Gt+7qXOF0cuVLTIaIzI54ylXX/mkxwwN/y5+eO413nFxXnYxhHEZnTfS6l/irUn/ut VsZQZQvZlwLKqfJ2QL3nVQluutEs50NGZN2hE1+UgF2w8FXfVYNAyfbnp9dVe/of/2U2dKTWC46Qu AvTgWY1zDjVFAYmaVvOu9ewzP57qvLgQvk/VzddgaJMHBgjJYTiFJilRgWcCvgnydIzZxhNSTjW5b b4pREPYvHG11sx7eML4YJPlB660lCBJhe2uJ5aoP5gguaTQSUjWcTg/XnbfYnunRw/nAj2g/uTFvM orIg870vYsODZiLDJxhA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wM3U2-0000000Ajct-43ZV; Sun, 10 May 2026 12:42:10 +0000 Received: from smtp.forwardemail.net ([121.127.44.73]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1wM3Ty-0000000AjWW-1hyD for linux-amlogic@lists.infradead.org; Sun, 10 May 2026 12:42:09 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kwiboo.se; h=Content-Transfer-Encoding: MIME-Version: References: In-Reply-To: Message-ID: Date: Subject: Cc: To: From; q=dns/txt; s=fe-e1b5cab7be; t=1778416916; bh=YPElDtV9eg2ObFwq32yfRisczcjIwpWrEjsNQBlqzi0=; b=YhlkrLZRWwq2XbbsDUaX02ZVag0jmccag3rZh+RSlfDnBQDkTZyXmZH8pRNV6l9JWPXF+7ah+ Vgzr+nHsz3guIBk5A6qUSqpnA6/WtI+oUvEGY8Usj1tnH169506G6AXTLyvJbIGu2wEXuxBJtuJ yebUcXI8neZBhETIL9wa8rK180nvQ4PanpJTh/wCP1l3ZP+M80IA+16GQIL1iLmFH7gvgJOXCGB a2tEN/AIiK6B3KtnpafCdvi3bW18bcbsJ7oaNDTcUBI+16ifKk8n/iPif344k89aVaMkZKsMn3Z l6MPaR2IWeM73XdFv9phtcSpCdyxtDVqtsRsD1bVKMzQ== X-Forward-Email-ID: 6a007cf30d91f03a31a0bb02 X-Forward-Email-Sender: rfc822; jonas@kwiboo.se, smtp.forwardemail.net, 121.127.44.73 X-Forward-Email-Version: 2.8.0 X-Forward-Email-Website: https://forwardemail.net X-Complaints-To: abuse@forwardemail.net X-Report-Abuse: abuse@forwardemail.net X-Report-Abuse-To: abuse@forwardemail.net From: Jonas Karlman To: Andrzej Hajda , Neil Armstrong , Robert Foss , Heiko Stuebner , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Luca Ceresoli , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter Subject: [PATCH v5 01/21] drm: bridge: dw_hdmi: Disable scrambler feature when not supported Date: Sun, 10 May 2026 12:40:45 +0000 Message-ID: <20260510124111.1226584-2-jonas@kwiboo.se> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260510124111.1226584-1-jonas@kwiboo.se> References: <20260510124111.1226584-1-jonas@kwiboo.se> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260510_054207_689906_4F3F7E59 X-CRM114-Status: GOOD ( 10.26 ) X-BeenThere: linux-amlogic@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Dmitry Baryshkov , imx@lists.linux.dev, Liu Ying , linux-kernel@vger.kernel.org, Sandy Huang , dri-devel@lists.freedesktop.org, linux-sunxi@lists.linux.dev, Diederik de Haas , linux-rockchip@lists.infradead.org, Christopher Obbard , linux-amlogic@lists.infradead.org, Andy Yan , Chen-Yu Tsai , Nicolas Frattaroli , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-amlogic" Errors-To: linux-amlogic-bounces+linux-amlogic=archiver.kernel.org@lists.infradead.org The scrambler feature can be left enabled when hotplugging from a sink and mode that require scrambling to a sink that does not support SCDC or scrambling. Typically a blank screen or 'no signal' message can be observed after using a HDMI 2.0 4K@60Hz mode and then hotplugging to a sink that only support HDMI 1.4. Fix this by disabling the scrambler feature when SCDC is not supported. Fixes: 264fce6cc2c1 ("drm/bridge: dw-hdmi: Add SCDC and TMDS Scrambling support") Reported-by: Christopher Obbard Reviewed-by: Neil Armstrong Signed-off-by: Jonas Karlman --- v5: No change v4: No change v3: Collect r-b tag v2: New patch --- drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c index 41b3a9cfa2f5..d3e6a6562870 100644 --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c @@ -2135,6 +2135,8 @@ static void hdmi_av_composer(struct dw_hdmi *hdmi, HDMI_MC_SWRSTZ); drm_scdc_set_scrambling(hdmi->curr_conn, 0); } + } else if (hdmi->version >= 0x200a) { + hdmi_writeb(hdmi, 0, HDMI_FC_SCRAMBLER_CTRL); } /* Set up horizontal active pixel width */ -- 2.54.0 _______________________________________________ linux-amlogic mailing list linux-amlogic@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-amlogic