[PATCH v10 19/69] drm/display: bridge_connector: Wire up HDMI 2.0 scrambler callbacks

[Cristian Ciocaltea]

Connect the bridge connector's .scrambler_{enable|disable} callbacks to
the underlying bridge's .hdmi_scrambler_{enable|disable} funcs when
HDMI 2.0 conformance is advertised.

This completes the bridge connector plumbing so that the SCDC
scrambling helpers can control source-side scrambling through the
bridge chain.

Tested-by: Maud Spierings <maud_spierings@xxxxxxxxxxx>
Tested-by: Diederik de Haas <diederik@xxxxxxxxxxxxxx>  # NanoPC-T6 LTS, Rock 5B
Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@xxxxxxxxxxxxx>
---
 drivers/gpu/drm/display/drm_bridge_connector.c | 40 +++++++++++++++++++++++++-
 1 file changed, 39 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/display/drm_bridge_connector.c b/drivers/gpu/drm/display/drm_bridge_connector.c
index 86353a0b9758..80b33d4f6b38 100644
--- a/drivers/gpu/drm/display/drm_bridge_connector.c
+++ b/drivers/gpu/drm/display/drm_bridge_connector.c
@@ -577,6 +577,32 @@ static int drm_bridge_connector_write_spd_infoframe(struct drm_connector *connec
 	return bridge->funcs->hdmi_write_spd_infoframe(bridge, buffer, len);
 }
 
+static int drm_bridge_connector_scrambler_enable(struct drm_connector *connector)
+{
+	struct drm_bridge_connector *bridge_connector =
+		to_drm_bridge_connector(connector);
+	struct drm_bridge *bridge;
+
+	bridge = bridge_connector->bridge_hdmi;
+	if (!bridge)
+		return -EINVAL;
+
+	return bridge->funcs->hdmi_scrambler_enable(bridge);
+}
+
+static int drm_bridge_connector_scrambler_disable(struct drm_connector *connector)
+{
+	struct drm_bridge_connector *bridge_connector =
+		to_drm_bridge_connector(connector);
+	struct drm_bridge *bridge;
+
+	bridge = bridge_connector->bridge_hdmi;
+	if (!bridge)
+		return -EINVAL;
+
+	return bridge->funcs->hdmi_scrambler_disable(bridge);
+}
+
 static const struct drm_edid *
 drm_bridge_connector_read_edid(struct drm_connector *connector)
 {
@@ -604,7 +630,7 @@ static const struct drm_connector_hdmi_funcs drm_bridge_connector_hdmi_funcs = {
 		.clear_infoframe = drm_bridge_connector_clear_hdmi_infoframe,
 		.write_infoframe = drm_bridge_connector_write_hdmi_infoframe,
 	},
-	/* audio, hdr_drm and spd are set dynamically during init */
+	/* scrambler, audio, hdr_drm and spd are set dynamically during init */
 };
 
 static const struct drm_connector_infoframe_funcs drm_bridge_connector_hdmi_audio_infoframe = {
@@ -908,6 +934,11 @@ struct drm_connector *drm_bridge_connector_init(struct drm_device *drm,
 			     !bridge->funcs->hdmi_clear_spd_infoframe))
 				return ERR_PTR(-EINVAL);
 
+			if (bridge->supported_hdmi_ver >= HDMI_VERSION_2_0 &&
+			    (!bridge->funcs->hdmi_scrambler_enable ||
+			     !bridge->funcs->hdmi_scrambler_disable))
+				return ERR_PTR(-EINVAL);
+
 			bridge_connector->bridge_hdmi = drm_bridge_get(bridge);
 		}
 
@@ -1027,6 +1058,13 @@ struct drm_connector *drm_bridge_connector_init(struct drm_device *drm,
 			bridge_connector->hdmi_funcs.spd =
 				drm_bridge_connector_hdmi_spd_infoframe;
 
+		if (bridge_connector->bridge_hdmi->supported_hdmi_ver >= HDMI_VERSION_2_0) {
+			bridge_connector->hdmi_funcs.scrambler_enable =
+				drm_bridge_connector_scrambler_enable;
+			bridge_connector->hdmi_funcs.scrambler_disable =
+				drm_bridge_connector_scrambler_disable;
+		}
+
 		ret = drmm_connector_hdmi_init(drm, connector,
 					       &drm_bridge_connector_funcs,
 					       &bridge_connector->hdmi_funcs,

-- 
2.55.0