diff --git a/drivers/gpu/drm/renesas/rcar-du/rcar_mipi_dsi.c b/drivers/gpu/drm/renesas/rcar-du/rcar_mipi_dsi.c
index 1af4c73f7a88..952c3efb74da 100644
--- a/drivers/gpu/drm/renesas/rcar-du/rcar_mipi_dsi.c
+++ b/drivers/gpu/drm/renesas/rcar-du/rcar_mipi_dsi.c
@@ -576,7 +576,10 @@ static int rcar_mipi_dsi_startup(struct rcar_mipi_dsi *dsi,
 	udelay(10);
 	rcar_mipi_dsi_clr(dsi, CLOCKSET1, CLOCKSET1_UPDATEPLL);
 
-	ppisetr = PPISETR_DLEN_3 | PPISETR_CLEN;
+	rcar_mipi_dsi_clr(dsi, TXSETR, TXSETR_LANECNT_MASK);
+	rcar_mipi_dsi_set(dsi, TXSETR, dsi->lanes - 1);
+
+	ppisetr = ((BIT(dsi->lanes) - 1) & PPISETR_DLEN_MASK) | PPISETR_CLEN;
 	rcar_mipi_dsi_write(dsi, PPISETR, ppisetr);
 
 	rcar_mipi_dsi_set(dsi, PHYSETUP, PHYSETUP_SHUTDOWNZ);
diff --git a/drivers/gpu/drm/renesas/rcar-du/rcar_mipi_dsi_regs.h b/drivers/gpu/drm/renesas/rcar-du/rcar_mipi_dsi_regs.h
index a6b276f1d6ee..a54c7eb4113b 100644
--- a/drivers/gpu/drm/renesas/rcar-du/rcar_mipi_dsi_regs.h
+++ b/drivers/gpu/drm/renesas/rcar-du/rcar_mipi_dsi_regs.h
@@ -12,6 +12,9 @@
 #define LINKSR_LPBUSY			(1 << 1)
 #define LINKSR_HSBUSY			(1 << 0)
 
+#define TXSETR				0x100
+#define TXSETR_LANECNT_MASK		(0x3 << 0)
+
 /*
  * Video Mode Register
  */
@@ -80,10 +83,7 @@
  * PHY-Protocol Interface (PPI) Registers
  */
 #define PPISETR				0x700
-#define PPISETR_DLEN_0			(0x1 << 0)
-#define PPISETR_DLEN_1			(0x3 << 0)
-#define PPISETR_DLEN_2			(0x7 << 0)
-#define PPISETR_DLEN_3			(0xf << 0)
+#define PPISETR_DLEN_MASK		(0xf << 0)
 #define PPISETR_CLEN			(1 << 8)
 
 #define PPICLCR				0x710