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 98661CD37B8 for ; Sun, 10 May 2026 12:42:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=YPElDtV9eg2ObFwq32yfRisczcjIwpWrEjsNQBlqzi0=; b=Q/Hpq62zBg9NqCSpRTO96RVGO5 MJVJFZLnj51BFV2nNUqlS60a9PpJuUDM5fsBDQK3wdVnOsdxHBD4hnPvg5DEcxY1DQjt+2Dl9NUj9 x9sR92mmI3HWYX7OrggR040sYAhaPh2WADJ4pud+yYbEl0AAibSqkf4ZFPDPM9Uzg9em284/58pAH t70v/+4uWRHTV8TzJlToUf+KgpZqCpcsmtPJPy4Pemazw7EqPgwLtZkrYTNDaMpwTk4G2OZX0Nx+/ 0Yk/o9fZ+GM/KfhGccIdLTpU2eDccYvoMkyyRhVrUY07BRCI9nPQTajpr1X5B4w7IHTOF/rsw017t PGgH5r5Q==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wM3U1-0000000Ajal-3KJS; Sun, 10 May 2026 12:42:09 +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-0000000AjWa-1iGt for linux-arm-kernel@lists.infradead.org; Sun, 10 May 2026 12:42:08 +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=1778416912; bh=YPElDtV9eg2ObFwq32yfRisczcjIwpWrEjsNQBlqzi0=; b=Bd7wwGfnRt2BrSyclITgvIZeGT/nwIUQbL/bxzv2zf8hIUHuux6skQj0D3OCah5ZOLCV6B1dh a/oRKY/a7QYlfFSijrtcENofUc/O570tKeQIaQrTneOFhpUVZuw7v+69/Mw1lI0LJiBxx8+WSRY aRbtW6KGuNvLgcAnehpM9Ny3jybvj/w4rVp4sb2zTX2ohtHa6uAbK07I45B8wYkHscX/Qs5NEJM 4SfFWbI+W2zD2f7ikJ3TSDWqTm15zffRmGo/GqY5eYuwE/obtWC523yRPYLwxMRXrqVBtGDSOGX PK4+LFXS4EN5iCs0iuOdX7Wrob91/Y1jRiZCwkwHgZew== 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 Cc: Liu Ying , Sandy Huang , Andy Yan , Chen-Yu Tsai , Christian Hewitt , Diederik de Haas , Nicolas Frattaroli , Dmitry Baryshkov , dri-devel@lists.freedesktop.org, linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org, linux-amlogic@lists.infradead.org, linux-sunxi@lists.linux.dev, imx@lists.linux.dev, linux-kernel@vger.kernel.org, Christopher Obbard 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 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260510_054207_690108_5B40728B X-CRM114-Status: GOOD ( 11.28 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=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