diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
index a8d3df0ea8f5..388e1161974c 100644
--- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
+++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
@@ -392,9 +392,15 @@ static u16 sun6i_dsi_get_drq_edge0(struct sun6i_dsi *dsi,
 				   struct drm_display_mode *mode,
 				   u16 line_num, u16 edge1)
 {
+	struct sun4i_tcon *tcon = dsi->tcon;
+	unsigned long dclk_rate, dclk_parent_rate, tcon0_div;
 	u16 edge0 = edge1;
 
-	edge0 += (mode->hdisplay + 40) * SUN6I_DSI_TCON_DIV / 8;
+	dclk_rate = clk_get_rate(tcon->dclk);
+	dclk_parent_rate = clk_get_rate(clk_get_parent(tcon->dclk));
+	tcon0_div = dclk_parent_rate / dclk_rate;
+
+	edge0 += (mode->hdisplay + 40) * tcon0_div / 8;
 
 	if (edge0 > line_num)
 		return edge0 - line_num;
diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.h b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.h
index 20516f7ab179..747c451a9a20 100644
--- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.h
+++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.h
@@ -13,8 +13,6 @@
 #include <drm/drm_encoder.h>
 #include <drm/drm_mipi_dsi.h>
 
-#define SUN6I_DSI_TCON_DIV	4
-
 struct sun6i_dsi {
 	struct drm_connector	connector;
 	struct drm_encoder	encoder;