drm: rcar-du: Rename DORCR fields to make them 0-based

The DORCR fields were documented in the R-Car H1 datasheet with 1-based
named, and then got renamed to 0-based in Gen2. The 0-based names are
used for Gen3 and Gen4, making H1 an outlier. Rename the field macros to
make them 0-based, in order to increase readability of the code when
comparing it with the documentation.
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>

drivers/gpu/drm/rcar-du/rcar_du_group.c

@@ -175,7 +175,7 @@ static void rcar_du_group_setup(struct rcar_du_group *rgrp)
 	 * Use DS1PR and DS2PR to configure planes priorities and connects the
 	 * superposition 0 to DU0 pins. DU1 pins will be configured dynamically.
 	 */
-	rcar_du_group_write(rgrp, DORCR, DORCR_PG1D_DS1 | DORCR_DPRS);
+	rcar_du_group_write(rgrp, DORCR, DORCR_PG0D_DS0 | DORCR_DPRS);
 
 	/* Apply planes to CRTCs association. */
 	mutex_lock(&rgrp->lock);
@@ -349,7 +349,7 @@ int rcar_du_group_set_routing(struct rcar_du_group *rgrp)
 	struct rcar_du_device *rcdu = rgrp->dev;
 	u32 dorcr = rcar_du_group_read(rgrp, DORCR);
 
-	dorcr &= ~(DORCR_PG2T | DORCR_DK2S | DORCR_PG2D_MASK);
+	dorcr &= ~(DORCR_PG1T | DORCR_DK1S | DORCR_PG1D_MASK);
 
 	/*
 	 * Set the DPAD1 pins sources. Select CRTC 0 if explicitly requested and
@@ -357,9 +357,9 @@ int rcar_du_group_set_routing(struct rcar_du_group *rgrp)
 	 * by default.
 	 */
 	if (rcdu->dpad1_source == rgrp->index * 2)
-		dorcr |= DORCR_PG2D_DS1;
+		dorcr |= DORCR_PG1D_DS0;
 	else
-		dorcr |= DORCR_PG2T | DORCR_DK2S | DORCR_PG2D_DS2;
+		dorcr |= DORCR_PG1T | DORCR_DK1S | DORCR_PG1D_DS1;
 
 	rcar_du_group_write(rgrp, DORCR, dorcr);
 

drivers/gpu/drm/rcar-du/rcar_du_regs.h

@@ -511,19 +511,19 @@
  */
 
 #define DORCR			0x11000
-#define DORCR_PG2T		(1 << 30)
-#define DORCR_DK2S		(1 << 28)
-#define DORCR_PG2D_DS1		(0 << 24)
-#define DORCR_PG2D_DS2		(1 << 24)
-#define DORCR_PG2D_FIX0		(2 << 24)
-#define DORCR_PG2D_DOOR		(3 << 24)
-#define DORCR_PG2D_MASK		(3 << 24)
-#define DORCR_DR1D		(1 << 21)
-#define DORCR_PG1D_DS1		(0 << 16)
-#define DORCR_PG1D_DS2		(1 << 16)
-#define DORCR_PG1D_FIX0		(2 << 16)
-#define DORCR_PG1D_DOOR		(3 << 16)
-#define DORCR_PG1D_MASK		(3 << 16)
+#define DORCR_PG1T		(1 << 30)
+#define DORCR_DK1S		(1 << 28)
+#define DORCR_PG1D_DS0		(0 << 24)
+#define DORCR_PG1D_DS1		(1 << 24)
+#define DORCR_PG1D_FIX0		(2 << 24)
+#define DORCR_PG1D_DOOR		(3 << 24)
+#define DORCR_PG1D_MASK		(3 << 24)
+#define DORCR_DR0D		(1 << 21)
+#define DORCR_PG0D_DS0		(0 << 16)
+#define DORCR_PG0D_DS1		(1 << 16)
+#define DORCR_PG0D_FIX0		(2 << 16)
+#define DORCR_PG0D_DOOR		(3 << 16)
+#define DORCR_PG0D_MASK		(3 << 16)
 #define DORCR_RGPV		(1 << 4)
 #define DORCR_DPRS		(1 << 0)