[PATCH v4 3/7] drm/connector: hdmi: Create the colorspace property

["Jan Claußen" <jan.claussen10@web.de>]

HDMI connectors initialised through drmm_connector_hdmi_init() do not
expose the colorspace property, so userspace cannot signal colorimetry
such as BT.2020 for HDR output. KWin, for instance, does not offer HDR
without it.

Add a supported_colorspaces bitmask to struct drm_connector_hdmi_funcs.
If a driver sets it, create and attach the colorspace property with
the colorspaces it lists, next to the other HDMI properties.

Signed-off-by: Jan Claußen <jan.claussen10@web.de>
---
 drivers/gpu/drm/drm_connector.c | 9 +++++++++
 include/drm/drm_connector.h     | 7 +++++++
 2 files changed, 16 insertions(+)

diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
index 66f53e155342..eea27bb6557c 100644
--- a/drivers/gpu/drm/drm_connector.c
+++ b/drivers/gpu/drm/drm_connector.c
@@ -672,6 +672,15 @@ int drmm_connector_hdmi_init(struct drm_device *dev,
 	/* TODO: remove after conversion to new drmm_connector_hdmi_init() */
 	connector->max_bpc = hdmi_funcs->max_bpc;
 
+	if (hdmi_funcs->supported_colorspaces) {
+		ret = drm_mode_create_hdmi_colorspace_property(connector,
+							       hdmi_funcs->supported_colorspaces);
+		if (ret)
+			return ret;
+
+		drm_connector_attach_colorspace_property(connector);
+	}
+
 	if (hdmi_funcs->max_bpc > 8)
 		drm_connector_attach_hdr_output_metadata_property(connector);
 
diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
index 2ee7c59329aa..9d2d133463ba 100644
--- a/include/drm/drm_connector.h
+++ b/include/drm/drm_connector.h
@@ -1521,6 +1521,13 @@ struct drm_connector_hdmi_funcs {
 	 */
 	unsigned long supported_formats;
 
+	/**
+	 * @supported_colorspaces:
+	 *
+	 * Bitmask of &enum drm_colorspace listing supported color spaces.
+	 */
+	unsigned long supported_colorspaces;
+
 	/**
 	 * @max_bpc: Maximum bits per char the HDMI connector supports.
 	 */
-- 
2.56.0