drm: rcar-du: lvds: Fix LVDCR1 for R-Car gen3

The LVDCR1 register for the R-Car gen3 SoCs was documented as having the
layout different from the gen2 SoCs in  the early R-Car gen3 manuals but
since v0.52 the LVDCR1 layout is described as being the same as on the gen2
SoCs; the old CHn control values are said to be prohibited now (and there
seems to be no valid output signal when they are used).

Fixes: 6bc2e15 ("drm: rcar-du: lvds: Add R-Car Gen3 support")
Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Tested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>

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

@@ -70,9 +70,8 @@ static void rcar_du_lvdsenc_start_gen2(struct rcar_du_lvdsenc *lvds,
 
 	/* Turn all the channels on. */
 	rcar_lvds_write(lvds, LVDCR1,
-			LVDCR1_CHSTBY_GEN2(3) | LVDCR1_CHSTBY_GEN2(2) |
-			LVDCR1_CHSTBY_GEN2(1) | LVDCR1_CHSTBY_GEN2(0) |
-			LVDCR1_CLKSTBY_GEN2);
+			LVDCR1_CHSTBY(3) | LVDCR1_CHSTBY(2) |
+			LVDCR1_CHSTBY(1) | LVDCR1_CHSTBY(0) | LVDCR1_CLKSTBY);
 
 	/*
 	 * Turn the PLL on, wait for the startup delay, and turn the output
@@ -109,9 +108,8 @@ static void rcar_du_lvdsenc_start_gen3(struct rcar_du_lvdsenc *lvds,
 
 	/* Turn all the channels on. */
 	rcar_lvds_write(lvds, LVDCR1,
-			LVDCR1_CHSTBY_GEN3(3) | LVDCR1_CHSTBY_GEN3(2) |
-			LVDCR1_CHSTBY_GEN3(1) | LVDCR1_CHSTBY_GEN3(0) |
-			LVDCR1_CLKSTBY_GEN3);
+			LVDCR1_CHSTBY(3) | LVDCR1_CHSTBY(2) |
+			LVDCR1_CHSTBY(1) | LVDCR1_CHSTBY(0) | LVDCR1_CLKSTBY);
 
 	/*
 	 * Turn the PLL on, set it to LVDS normal mode, wait for the startup

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

@@ -26,10 +26,8 @@
 
 #define LVDCR1				0x0004
 #define LVDCR1_CKSEL			(1 << 15)		/* Gen2 only */
-#define LVDCR1_CHSTBY_GEN2(n)		(3 << (2 + (n) * 2))	/* Gen2 only */
-#define LVDCR1_CHSTBY_GEN3(n)		(1 << (2 + (n) * 2))	/* Gen3 only */
-#define LVDCR1_CLKSTBY_GEN2		(3 << 0)		/* Gen2 only */
-#define LVDCR1_CLKSTBY_GEN3		(1 << 0)		/* Gen3 only */
+#define LVDCR1_CHSTBY(n)		(3 << (2 + (n) * 2))
+#define LVDCR1_CLKSTBY			(3 << 0)
 
 #define LVDPLLCR			0x0008
 #define LVDPLLCR_CEEN			(1 << 14)