diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
index 1c7740ce052e..f4e21dab5f85 100644
--- a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
+++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
@@ -529,8 +529,8 @@ static int dw_mipi_dsi_get_lane_bps(struct dw_mipi_dsi *dsi,
 
 	mpclk = DIV_ROUND_UP(mode->clock, MSEC_PER_SEC);
 	if (mpclk) {
-		/* take 1 / 0.9, since mbps must big than bandwidth of RGB */
-		tmp = mpclk * (bpp / dsi->lanes) * 10 / 9;
+		/* take 1 / 0.8, since mbps must big than bandwidth of RGB */
+		tmp = mpclk * (bpp / dsi->lanes) * 10 / 8;
 		if (tmp < max_mbps)
 			target_mbps = tmp;
 		else