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 AC986CD3440 for ; Mon, 4 May 2026 19:11:39 +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=xAbO5ff4vqTMZmiVH0eOAKijSbCKMVUEoLmJ8cZ0xrw=; b=ni7MsCfnEEflOU 85UVLSZUJC7+jDSFUhS++TEhBJc/vy8d0RZsupQOWTuWOSxdJA5f4Ledy+ya+qcYxsupvn36Ll/Pv 6G0PUOYwXBBYBGx0Md1IZwZRjoFFffSEcDILL452C9CbqRwPcDBriURR6JHshhrkRD1dnWeRQT1z5 Kug8n4tEnQJ/SZyTAHt+Si3To6S0SI9BDgrJnhoKS67NFVUeY+nHwpbtwsbdoNi1YthA6nEnr4mYs XHmP9yKWMFgrdhacra2GV42m0CocxGrP3h5gKcgNh3rlSGsvS6y6yuPyuZschI7Jd38g7kMjg2B/s lRUo16bFC1qRcTrMdNzQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1wJyhb-0000000E4zv-0RlU; Mon, 04 May 2026 19:11:35 +0000 Received: from smtp.forwardemail.net ([149.28.215.223]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1wJyhT-0000000E4uY-23ZF for linux-amlogic@lists.infradead.org; Mon, 04 May 2026 19:11:31 +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=1777921886; bh=NVWUpLoYoqwHrhK1PEs6caGhSJc5nSsIxxdrR4kmbpQ=; b=rKqvoAFzUm6XcmLFTLRbfxVkDbE/bzg6fm0XslDNsU2Du0KXOBh/PtpHFyfGVqrhb49MmIeKQ TKlX06U5JIbzB1z73UUIo8BREI35mPZgdVSldGmjodcMDNUU0Jd+QBrSrbstC7W/Isu+w3QlZwp CLpAwBrjDLoAqTCfTK7JSy8kyndKJ4Ux66herb+pyLKIFPN0NGQrQMdhemq58RQ76W13gTttocY OZwlvN+F8LgjA53YeJP9zYd946vQbz9e6LFEPR7gUNaAJluqCmOORHsebldA4wzfjBiDujDkV0z q+rdn0gd+487TyNMuEafK1ILgPg4olC73Xz+3QRY4y+g== X-Forward-Email-ID: 69f8ef4e04bb1dff846bb7fb X-Forward-Email-Sender: rfc822; jonas@kwiboo.se, smtp.forwardemail.net, 149.28.215.223 X-Forward-Email-Version: 2.7.7 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 , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter Subject: [PATCH v4 01/17] drm: bridge: dw_hdmi: Disable scrambler feature when not supported Date: Mon, 4 May 2026 19:10:38 +0000 Message-ID: <20260504191059.275928-2-jonas@kwiboo.se> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260504191059.275928-1-jonas@kwiboo.se> References: <20260504191059.275928-1-jonas@kwiboo.se> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260504_121127_556129_AD3B5739 X-CRM114-Status: GOOD ( 10.80 ) 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 --- 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 f4a1ebb79716..248454c45d6b 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