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BAYES_HAM(-5.50)[100.00%]; RBL_SENDERSCORE(2.00)[172.234.253.10:from]; SUSPICIOUS_RECIPS(1.50)[]; MID_CONTAINS_FROM(1.00)[]; R_MISSING_CHARSET(0.50)[]; MAILLIST(-0.15)[generic]; MIME_GOOD(-0.10)[text/plain]; BAD_REP_POLICIES(0.10)[]; HAS_LIST_UNSUB(-0.01)[]; RCPT_COUNT_TWELVE(0.00)[29]; PRECEDENCE_BULK(0.00)[]; TAGGED_RCPT(0.00)[]; FUZZY_BLOCKED(0.00)[rspamd.com]; DBL_BLOCKED_OPENRESOLVER(0.00)[collabora.com:email,cknow-tech.com:email,kwiboo.se:email,kwiboo.se:dkim,linaro.org:email,sea.lore.kernel.org:rdns,sea.lore.kernel.org:helo]; FROM_HAS_DN(0.00)[]; FREEMAIL_CC(0.00)[nxp.com,rock-chips.com,kernel.org,gmail.com,cknow-tech.com,collabora.com,oss.qualcomm.com,lists.freedesktop.org,lists.infradead.org,lists.linux.dev,vger.kernel.org]; R_DKIM_ALLOW(0.00)[kwiboo.se:s=fe-e1b5cab7be]; FROM_NEQ_ENVFROM(0.00)[jonas@kwiboo.se,linux-sunxi@lists.linux.dev]; DMARC_POLICY_ALLOW(0.00)[kwiboo.se,quarantine]; FREEMAIL_TO(0.00)[intel.com,linaro.org,kernel.org,sntech.de,ideasonboard.com,kwiboo.se,gmail.com,bootlin.com,linux.intel.com,suse.de,ffwll.ch]; DKIM_TRACE(0.00)[kwiboo.se:+]; R_SPF_ALLOW(0.00)[+ip4:172.234.253.10: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-23396-noreply=patchwork.local]; ASN(0.00)[asn:63949, ipnet:172.234.224.0/19, country:SG]; TO_DN_SOME(0.00)[] X-Rspamd-Queue-Id: D24051C07AB 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 Tested-by: Diederik de Haas # Rock64, RockPro64, Quartz64-B Signed-off-by: Jonas Karlman --- 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 */