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 e13249e0134b..f6427476feb7 100644
--- a/drivers/gpu/drm/renesas/rcar-du/rcar_mipi_dsi.c
+++ b/drivers/gpu/drm/renesas/rcar-du/rcar_mipi_dsi.c
@@ -5,6 +5,7 @@
  * Copyright (C) 2020 Renesas Electronics Corporation
  */
 
+#include <linux/bitfield.h>
 #include <linux/clk.h>
 #include <linux/delay.h>
 #include <linux/io.h>
@@ -624,6 +625,7 @@ static int rcar_mipi_dsi_startup(struct rcar_mipi_dsi *dsi,
 	vclkset = VCLKSET_CKEN;
 	rcar_mipi_dsi_write(dsi, VCLKSET, vclkset);
 
+	/* Output is always RGB, never YCbCr */
 	if (dsi_format == 24)
 		vclkset |= VCLKSET_BPP_24;
 	else if (dsi_format == 18)
@@ -635,7 +637,7 @@ static int rcar_mipi_dsi_startup(struct rcar_mipi_dsi *dsi,
 		return -EINVAL;
 	}
 
-	vclkset |= VCLKSET_COLOR_RGB | VCLKSET_LANE(dsi->lanes - 1);
+	vclkset |= VCLKSET_LANE(dsi->lanes - 1);
 
 	switch (dsi->info->model) {
 	case RCAR_DSI_V3U:
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 62341416ac6e..2db3dda030db 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
@@ -246,14 +246,14 @@
 
 #define VCLKSET				0x100c
 #define VCLKSET_CKEN			(1 << 16)
-#define VCLKSET_COLOR_RGB		(0 << 8)
-#define VCLKSET_COLOR_YCC		(1 << 8)
+#define VCLKSET_COLOR_YCC		(1 << 8) /* 0:RGB 1:YCbCr */
 #define VCLKSET_DIV_V3U(x)		(((x) & 0x3) << 4)
 #define VCLKSET_DIV_V4H(x)		(((x) & 0x7) << 4)
-#define VCLKSET_BPP_16			(0 << 2)
-#define VCLKSET_BPP_18			(1 << 2)
-#define VCLKSET_BPP_18L			(2 << 2)
-#define VCLKSET_BPP_24			(3 << 2)
+#define VCLKSET_BPP_MASK		(3 << 2)
+#define VCLKSET_BPP_16			FIELD_PREP(VCLKSET_BPP_MASK, 0)
+#define VCLKSET_BPP_18			FIELD_PREP(VCLKSET_BPP_MASK, 1)
+#define VCLKSET_BPP_18L			FIELD_PREP(VCLKSET_BPP_MASK, 2)
+#define VCLKSET_BPP_24			FIELD_PREP(VCLKSET_BPP_MASK, 3)
 #define VCLKSET_LANE(x)			(((x) & 0x3) << 0)
 
 #define VCLKEN				0x1010