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q=dns/txt; s=fe-e1b5cab7be; t=1777921890; bh=NVWUpLoYoqwHrhK1PEs6caGhSJc5nSsIxxdrR4kmbpQ=; b=pATKA5TzjDnVUm+yEPQ/r3CDL+i793jw7dbB/Pabb5sAnyEVXp/fguOc7z6ord4PzqkgdIHkf xb3B2YUvly1tJQww6IyvI43KyOpGD3q4L1fbps8jFO6Yu0fl9XSpYrddXDPXtEBdzGIJCOx31qw IBWNJhNB+RIyQbc2y9F+JVu6hM3mTHkmI5RowVKL0wH9bIWqN9lglOuBMdOKJvXx83c71szl++V qzVaansjJqhEvTymuYHrv/VwqPl8WO+JkNsUABlxS/MJgeSkHlXFaZnRcoY4AtQRAwBibmoavJK v3c5CSAuhdxoUKRoQc3/BQYv/zUkMpnLwmGqUbFoDr9Q== 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 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 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> Precedence: bulk X-Mailing-List: linux-sunxi@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Rspamd-Server: rspamd-worker-8404 X-Spamd-Result: default: False [-0.66 / 15.00]; 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DKIM_TRACE(0.00)[kwiboo.se:+]; R_SPF_ALLOW(0.00)[+ip4:172.105.105.114:c]; RCVD_COUNT_THREE(0.00)[4]; FORGED_SENDER_MAILLIST(0.00)[]; FORGED_RECIPIENTS_MAILLIST(0.00)[]; RCVD_TLS_LAST(0.00)[]; ARC_ALLOW(0.00)[subspace.kernel.org:s=arc-20240116:i=1]; MIME_TRACE(0.00)[0:+]; TAGGED_FROM(0.00)[bounces-23076-noreply=patchwork.local]; ASN(0.00)[asn:63949, ipnet:172.105.96.0/20, country:SG]; TO_DN_SOME(0.00)[] X-Rspamd-Queue-Id: E9D5C1C00CA X-MORS-Enabled: yes X-MORS-DOMAIN: patchwork.local X-MORS-HOSTING: hosting172546 X-MORS-USER: hosting172546 X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= 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 */