drm: rcar-du: Don't write unimplemented ESCR and OTAR registers on Gen3

The ESCR and OTAR registers are not present in all DU channels on Gen3
SoCs. ESCR only exists in channels that can be routed to an LVDS or
DPAD, and OTAR in channels that can be routed to a DPAD. Skip writing
those registers for other channels. This replaces the DU gen check, as
Gen4 doesn't have LVDS or DPAD outputs.
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_crtc.c

@@ -298,13 +298,26 @@ static void rcar_du_crtc_set_display_timing(struct rcar_du_crtc *rcrtc)
 		escr = params.escr;
 	}
 
-	if (rcdu->info->gen < 4) {
+	/*
+	 * The ESCR register only exists in DU channels that can output to an
+	 * LVDS or DPAT, and the OTAR register in DU channels that can output
+	 * to a DPAD.
+	 */
+	if ((rcdu->info->routes[RCAR_DU_OUTPUT_DPAD0].possible_crtcs |
+	     rcdu->info->routes[RCAR_DU_OUTPUT_DPAD1].possible_crtcs |
+	     rcdu->info->routes[RCAR_DU_OUTPUT_LVDS0].possible_crtcs |
+	     rcdu->info->routes[RCAR_DU_OUTPUT_LVDS1].possible_crtcs) &
+	    BIT(rcrtc->index)) {
 		dev_dbg(rcrtc->dev->dev, "%s: ESCR 0x%08x\n", __func__, escr);
 
 		rcar_du_crtc_write(rcrtc, rcrtc->index % 2 ? ESCR13 : ESCR02, escr);
-		rcar_du_crtc_write(rcrtc, rcrtc->index % 2 ? OTAR13 : OTAR02, 0);
 	}
 
+	if ((rcdu->info->routes[RCAR_DU_OUTPUT_DPAD0].possible_crtcs |
+	     rcdu->info->routes[RCAR_DU_OUTPUT_DPAD1].possible_crtcs) &
+	    BIT(rcrtc->index))
+		rcar_du_crtc_write(rcrtc, rcrtc->index % 2 ? OTAR13 : OTAR02, 0);
+
 	/* Signal polarities */
 	dsmr = ((mode->flags & DRM_MODE_FLAG_PVSYNC) ? DSMR_VSL : 0)
 	     | ((mode->flags & DRM_MODE_FLAG_PHSYNC) ? DSMR_HSL : 0)