[PATCH v6 2/2] drm/connector: hdmi: Add support for 'link bpc' property

[Nicolas Frattaroli]

Create and attach the 'link bpc' DRM property for every HDMI connector
that's created through drmm_connector_hdmi_init.

Then, set the connector state's link_bpc member in the HDMI atomic check
state helper to the connector state's HDMI output bpc.

Acked-by: Maxime Ripard <mripard@xxxxxxxxxx>
Signed-off-by: Nicolas Frattaroli <nicolas.frattaroli@xxxxxxxxxxxxx>
---
 drivers/gpu/drm/display/drm_hdmi_state_helper.c | 2 ++
 drivers/gpu/drm/drm_connector.c                 | 4 ++++
 2 files changed, 6 insertions(+)

diff --git a/drivers/gpu/drm/display/drm_hdmi_state_helper.c b/drivers/gpu/drm/display/drm_hdmi_state_helper.c
index 9f3b696aceeb..b670bcdbd3c6 100644
--- a/drivers/gpu/drm/display/drm_hdmi_state_helper.c
+++ b/drivers/gpu/drm/display/drm_hdmi_state_helper.c
@@ -887,6 +887,8 @@ int drm_atomic_helper_connector_hdmi_check(struct drm_connector *connector,
 		struct drm_crtc *crtc = new_conn_state->crtc;
 		struct drm_crtc_state *crtc_state;
 
+		new_conn_state->link_bpc = new_conn_state->hdmi.output_bpc;
+
 		crtc_state = drm_atomic_get_crtc_state(state, crtc);
 		if (IS_ERR(crtc_state))
 			return PTR_ERR(crtc_state);
diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
index 85557106218b..2a2e56bf062d 100644
--- a/drivers/gpu/drm/drm_connector.c
+++ b/drivers/gpu/drm/drm_connector.c
@@ -693,6 +693,10 @@ int drmm_connector_hdmi_init(struct drm_device *dev,
 	drm_connector_attach_max_bpc_property(connector, 8, max_bpc);
 	connector->max_bpc = max_bpc;
 
+	ret = drm_connector_attach_link_bpc_property(connector, max_bpc);
+	if (ret)
+		return ret;
+
 	if (max_bpc > 8)
 		drm_connector_attach_hdr_output_metadata_property(connector);
 

-- 
2.53.0