can: rcar_canfd: Fix data transmission failed on R-Car V3U

On R-Car V3U, this driver should use suitable register offset instead of
other SoCs' one. Otherwise, data transmission failed on R-Car V3U.

Fixes: 45721c4 ("can: rcar_canfd: Add support for r8a779a0 SoC")
Link: https://lore.kernel.org/all/20220704074611.957191-1-yoshihiro.shimoda.uh@renesas.com
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Duy Nguyen <duy.nguyen.rh@renesas.com>
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

Author: Duy Nguyen

drivers/net/can/rcar/rcar_canfd.c

@@ -1332,7 +1332,10 @@ static void rcar_canfd_set_bittiming(struct net_device *dev)
 		cfg = (RCANFD_DCFG_DTSEG1(gpriv, tseg1) | RCANFD_DCFG_DBRP(brp) |
 		       RCANFD_DCFG_DSJW(sjw) | RCANFD_DCFG_DTSEG2(gpriv, tseg2));
 
-		rcar_canfd_write(priv->base, RCANFD_F_DCFG(ch), cfg);
+		if (is_v3u(gpriv))
+			rcar_canfd_write(priv->base, RCANFD_V3U_DCFG(ch), cfg);
+		else
+			rcar_canfd_write(priv->base, RCANFD_F_DCFG(ch), cfg);
 		netdev_dbg(priv->ndev, "drate: brp %u, sjw %u, tseg1 %u, tseg2 %u\n",
 			   brp, sjw, tseg1, tseg2);
 	} else {