diff --git a/drivers/gpu/drm/rockchip/cdn-dp-core.c b/drivers/gpu/drm/rockchip/cdn-dp-core.c
index e483bd941d89..a321b2896435 100644
--- a/drivers/gpu/drm/rockchip/cdn-dp-core.c
+++ b/drivers/gpu/drm/rockchip/cdn-dp-core.c
@@ -953,12 +953,22 @@ static int cdn_dp_encoder_atomic_check(struct drm_encoder *encoder,
 				       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);
 	uint64_t old_cp = DRM_MODE_CONTENT_PROTECTION_UNDESIRED;
 
+	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->bus_format = MEDIA_BUS_FMT_RGB888_1X24;
 	s->tv_state = &conn_state->tv;
 	s->eotf = TRADITIONAL_GAMMA_SDR;
 	s->color_space = V4L2_COLORSPACE_DEFAULT;