diff --git a/drivers/gpu/drm/rockchip/cdn-dp-core.c b/drivers/gpu/drm/rockchip/cdn-dp-core.c
index a85cbe8c325c..0d0fd25d13cb 100644
--- a/drivers/gpu/drm/rockchip/cdn-dp-core.c
+++ b/drivers/gpu/drm/rockchip/cdn-dp-core.c
@@ -11,6 +11,7 @@
 #include <linux/phy/phy.h>
 #include <linux/regmap.h>
 #include <linux/reset.h>
+#include <uapi/linux/videodev2.h>
 
 #include <sound/hdmi-codec.h>
 
@@ -742,11 +743,25 @@ static int cdn_dp_encoder_atomic_check(struct drm_encoder *encoder,
 				       struct drm_crtc_state *crtc_state,
 				       struct drm_connector_state *conn_state)
 {
+	struct cdn_dp_device *dp = encoder_to_dp(encoder);
+	struct drm_display_info *di = &dp->connector.display_info;
 	struct rockchip_crtc_state *s = to_rockchip_crtc_state(crtc_state);
 
+	switch (di->bpc) {
+	case 6:
+		s->bus_format = MEDIA_BUS_FMT_RGB666_1X24_CPADHI;
+		break;
+	case 8:
+	default:
+		s->bus_format = MEDIA_BUS_FMT_RGB888_1X24;
+		break;
+	}
+
 	s->output_mode = ROCKCHIP_OUT_MODE_AAAA;
 	s->output_type = DRM_MODE_CONNECTOR_DisplayPort;
 	s->tv_state = &conn_state->tv;
+	s->eotf = HDMI_EOTF_TRADITIONAL_GAMMA_SDR;
+	s->color_encoding = DRM_COLOR_YCBCR_BT709;
 
 	return 0;
 }