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 dd871e17dcf5..b8a719a13c00 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
@@ -143,7 +143,8 @@
 #define TXVMSETR_SYNSEQ_PULSES		(0 << 16)
 #define TXVMSETR_SYNSEQ_EVENTS		(1 << 16)
 #define TXVMSETR_VSTPM			(1 << 15)
-#define TXVMSETR_PIXWDTH		(1 << 8)
+#define TXVMSETR_PIXWDTH_MASK		(7 << 8)
+#define TXVMSETR_PIXWDTH		(1 << 8) /* Only allowed value */
 #define TXVMSETR_VSEN_EN		(1 << 4)
 #define TXVMSETR_VSEN_DIS		(0 << 4)
 #define TXVMSETR_HFPBPEN_EN		(1 << 2)