[PATCH v11 16/74] drm/bridge: Add bridge ops for source-side HDMI 2.0 scrambling
From: Cristian Ciocaltea <hidden>
Date: 2026-09-01 18:51:08
Also in:
dri-devel, linux-fbdev, linux-rockchip, linux-sunxi, lkml
Subsystem:
drm drivers, drm drivers for bridge chips, the rest · Maintainers:
David Airlie, Simona Vetter, Andrzej Hajda, Neil Armstrong, Robert Foss, Linus Torvalds
Bridges advertising HDMI 2.0 must be able to enable and disable
source-side scrambling and the high TMDS clock ratio when the configured
mode exceeds 340 MHz.
Add .hdmi_scrambler_{enable|disable}() callbacks covering the
source-side programming only; sink-side SCDC negotiation remains the job
of the HDMI connector helpers.
Reviewed-by: Dmitry Baryshkov <redacted>
Signed-off-by: Cristian Ciocaltea <redacted>
---
include/drm/drm_bridge.h | 35 +++++++++++++++++++++++++++++++++++
1 file changed, 35 insertions(+)
diff --git a/include/drm/drm_bridge.h b/include/drm/drm_bridge.h
index 5a5a25995471..77b3ffe69230 100644
--- a/include/drm/drm_bridge.h
+++ b/include/drm/drm_bridge.h@@ -561,6 +561,41 @@ struct drm_bridge_funcs { const struct drm_display_mode *mode, unsigned long long tmds_rate); + /** + * @hdmi_scrambler_enable: + * + * Enable source-side scrambling and the high TMDS clock ratio for the + * mode currently being applied. + * + * This only programs the source side. Sink-side SCDC configuration is + * handled by the HDMI connector helpers. + * + * Mandatory for bridges that set the DRM_BRIDGE_OP_HDMI flag in their + * &drm_bridge->ops and advertise HDMI_VERSION_2_0 or later via + * &drm_bridge->supported_hdmi_ver; unused otherwise. + * + * Returns: + * 0 on success, a negative error code otherwise. + */ + int (*hdmi_scrambler_enable)(struct drm_bridge *bridge); + + /** + * @hdmi_scrambler_disable: + * + * Disable source-side scrambling and the high TMDS clock ratio. + * + * This only programs the source side. Sink-side SCDC configuration is + * handled by the HDMI connector helpers. + * + * Mandatory for bridges that set the DRM_BRIDGE_OP_HDMI flag in their + * &drm_bridge->ops and advertise HDMI_VERSION_2_0 or later via + * &drm_bridge->supported_hdmi_ver; unused otherwise. + * + * Returns: + * 0 on success, a negative error code otherwise. + */ + int (*hdmi_scrambler_disable)(struct drm_bridge *bridge); + /** * @hdmi_clear_avi_infoframe: *
--
2.55.0