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 32338CD4F3C for ; Mon, 18 May 2026 18:03:35 +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=ekLFiuA5LHJ1K4AwsqziqaN73igiV1Vs60emAD7t1N0=; b=Pb+rPsqMoG+EVy p4pF18VYW30u0tBLSSayDPv3fYXWLbY/DUweVe+e7U1cFwBsqROe+QkOtJHcM0vI5JGZ/ZhsDH0Om 3JSdFxCDW8ENlaEZRCiNeTcp6xgibiZ4F4P7ci3WI56+qgrlNlyuWE3Wpj2pQDcxFswbk5EYkqOQv sA7odCfkDA6OehMo79AfRRPOmrnyJq75EQlBK65fmGyiVaYA3y2r4tYJqzqhRPZROCBc2xMwjSniM vGciaKyd8jZ84T15zhwCHPDRvTp1++/pK3hIQsCfx88nvqJm5zFsYGZ7xjxs0VdI0VLo7ty+ENtMx vYehkHsDFwDJFKbwk7Hg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wP2JP-0000000GU2L-0S0X; Mon, 18 May 2026 18:03:31 +0000 Received: from smtp.forwardemail.net ([149.28.215.223]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1wP2JI-0000000GTqP-0sjZ for linux-amlogic@lists.infradead.org; Mon, 18 May 2026 18:03:29 +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=1779127400; bh=6RF7BKuGakMjKCbN9mlVwwIB3PRUeYCX0ksZtYl9O4g=; b=iA372Ebr8yTJNxkB7lSK+/C/iL1unciSgb8J6fM+Rgdz6oI+WTFVxrfiNbTNYbhBsM3aTgeUE TnUeSOr0SfdUIbcw+sZsdYGIluXSWTp1CYslm99UNoiyxb6mn9kkaYNARYQEiDwPdxpsI+PCVbN 0EWDxcUNQWqlKR062F7X1eS4oqWK2Wmx5ZHWCZvRSWeK6KncVIf6n0UYoepwFBHiA6n0X/q1RXC yzkJ/degxW0OQB+qrq2py4fN+xjqlZUaJ6PCNYmkFXns+JKKA3TEI+Tx4fYpAOM8F8PMyUX8B4S LWj0kdd/dnXXgj0KObJSI734Yt0mOykx7cvPzHvmtI8Q== X-Forward-Email-ID: 6a0b5429b84dbc72d2274daf X-Forward-Email-Sender: rfc822; jonas@kwiboo.se, smtp.forwardemail.net, 149.28.215.223 X-Forward-Email-Version: 2.8.12 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 v7 01/23] drm: bridge: dw_hdmi: Disable scrambler feature when not supported Date: Mon, 18 May 2026 18:01:37 +0000 Message-ID: <20260518180206.2480119-2-jonas@kwiboo.se> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260518180206.2480119-1-jonas@kwiboo.se> References: <20260518180206.2480119-1-jonas@kwiboo.se> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260518_110324_286310_CA6C93A4 X-CRM114-Status: GOOD ( 10.54 ) 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 Tested-by: Diederik de Haas # Rock64, RockPro64, Quartz64-B Signed-off-by: Jonas Karlman --- v7: No change v6: Collect t-b tag 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