[PATCH v13 05/27] drm/display: bridge_connector: Use HDMI color format for HDMI conns

[Nicolas Frattaroli <nicolas.frattaroli@collabora.com>]

For bridge connectors which contain an HDMI bridge at some stage, the
HDMI state helpers' format selection logic should be involved.

Add an implementation for the drm_bridge_funcs color_format function,
which translates from the HDMI state's output format to a connector
format for bridge connectors involving an HDMI bridge, but return the
connector state's color_format member unchanged otherwise.

Signed-off-by: Nicolas Frattaroli <nicolas.frattaroli@collabora.com>
---
 drivers/gpu/drm/display/drm_bridge_connector.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/drivers/gpu/drm/display/drm_bridge_connector.c b/drivers/gpu/drm/display/drm_bridge_connector.c
index 39cc18f78eda..bcfa4f2ca3e4 100644
--- a/drivers/gpu/drm/display/drm_bridge_connector.c
+++ b/drivers/gpu/drm/display/drm_bridge_connector.c
@@ -276,6 +276,29 @@ static void drm_bridge_connector_reset(struct drm_connector *connector)
 							 connector->state);
 }
 
+static enum drm_connector_color_format
+drm_bridge_connector_color_format(const struct drm_connector_state *conn_state)
+{
+	struct drm_bridge_connector *bridge_connector =
+		to_drm_bridge_connector(conn_state->connector);
+
+	if (bridge_connector->bridge_hdmi) {
+		switch (conn_state->hdmi.output_format) {
+		default:
+		case DRM_OUTPUT_COLOR_FORMAT_RGB444:
+			return DRM_CONNECTOR_COLOR_FORMAT_RGB444;
+		case DRM_OUTPUT_COLOR_FORMAT_YCBCR444:
+			return DRM_CONNECTOR_COLOR_FORMAT_YCBCR444;
+		case DRM_OUTPUT_COLOR_FORMAT_YCBCR422:
+			return DRM_CONNECTOR_COLOR_FORMAT_YCBCR422;
+		case DRM_OUTPUT_COLOR_FORMAT_YCBCR420:
+			return DRM_CONNECTOR_COLOR_FORMAT_YCBCR420;
+		}
+	}
+
+	return conn_state->color_format;
+}
+
 static const struct drm_connector_funcs drm_bridge_connector_funcs = {
 	.reset = drm_bridge_connector_reset,
 	.detect = drm_bridge_connector_detect,
@@ -285,6 +308,7 @@ static const struct drm_connector_funcs drm_bridge_connector_funcs = {
 	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 	.debugfs_init = drm_bridge_connector_debugfs_init,
 	.oob_hotplug_event = drm_bridge_connector_oob_hotplug_event,
+	.color_format = drm_bridge_connector_color_format,
 };
 
 /* -----------------------------------------------------------------------------

-- 
2.53.0