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DKIM_TRACE(0.00)[collabora.com:+]; TO_DN_SOME(0.00)[]; R_SPF_ALLOW(0.00)[+ip4:172.234.253.10:c]; R_DKIM_ALLOW(0.00)[collabora.com:s=mail]; 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-24650-noreply=patchwork.local]; ASN(0.00)[asn:63949, ipnet:172.234.224.0/19, country:SG]; RCVD_VIA_SMTP_AUTH(0.00)[] X-Rspamd-Queue-Id: 7D4751C2B5B 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 HDMI 2.0 spec advises that compliant Source devices report their SCDC version in the Source Version register. Do so when enabling scrambling by calling drm_scdc_set_source_version(). Failures are non-fatal: SCDC version negotiation is purely informational and does not gate scrambling or any high-bitrate functionality, so a flaky DDC bus should not block scrambling setup. Acked-by: Maxime Ripard Tested-by: Maud Spierings Signed-off-by: Cristian Ciocaltea --- drivers/gpu/drm/display/drm_hdmi_helper.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/gpu/drm/display/drm_hdmi_helper.c b/drivers/gpu/drm/display/drm_hdmi_helper.c index b9be0a2e833a..e66ee8aa4ebc 100644 --- a/drivers/gpu/drm/display/drm_hdmi_helper.c +++ b/drivers/gpu/drm/display/drm_hdmi_helper.c @@ -16,6 +16,7 @@ #include #include +#define DRM_HDMI_SCDC_SOURCE_VERSION 1 #define DRM_HDMI_SCDC_POLL_DELAY_MS 1000 static inline bool is_eotf_supported(u8 output_eotf, u8 sink_eotf) @@ -541,6 +542,12 @@ int drm_connector_hdmi_enable_scrambling(struct drm_connector *connector, if (!connector->ddc) return -EINVAL; + /* + * Advertise our SCDC source version. This is purely informational and + * does not gate scrambling, so failures are non-fatal. + */ + drm_scdc_set_source_version(connector, DRM_HDMI_SCDC_SOURCE_VERSION); + drm_dbg_kms(dev, "Enabling scrambling\n"); if (!hdmi->scdc_work_initialized) {