[PATCH 7/9] can: rcar_canfd: Share config code in rcar_canfd_set_bittiming()

[Geert Uytterhoeven <geert+renesas@xxxxxxxxx>]

The configuration register format for nominal bit timings in CAN-FD mode
and the format for bit timings in CAN mode on CAN-FD controllers with
shared Classical CAN registers are the same.

Restructure the code to make this clear, also reducing kernel size by 80
bytes.

Signed-off-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
---
 drivers/net/can/rcar/rcar_canfd.c | 31 +++++++++----------------------
 1 file changed, 9 insertions(+), 22 deletions(-)

diff --git a/drivers/net/can/rcar/rcar_canfd.c b/drivers/net/can/rcar/rcar_canfd.c
index 7a9a88fa5fb1a521..6e77e4844c3f63e9 100644
--- a/drivers/net/can/rcar/rcar_canfd.c
+++ b/drivers/net/can/rcar/rcar_canfd.c
@@ -1450,15 +1450,19 @@ static void rcar_canfd_set_bittiming(struct net_device *ndev)
 	tseg1 = bt->prop_seg + bt->phase_seg1 - 1;
 	tseg2 = bt->phase_seg2 - 1;
 
-	if (priv->can.ctrlmode & CAN_CTRLMODE_FD) {
-		/* CAN FD only mode */
+	if ((priv->can.ctrlmode & CAN_CTRLMODE_FD) || gpriv->info->shared_can_regs) {
 		cfg = (RCANFD_NCFG_NTSEG1(gpriv, tseg1) | RCANFD_NCFG_NBRP(brp) |
 		       RCANFD_NCFG_NSJW(gpriv, sjw) | RCANFD_NCFG_NTSEG2(gpriv, tseg2));
+	} else {
+		cfg = (RCANFD_CFG_TSEG1(tseg1) | RCANFD_CFG_BRP(brp) |
+		       RCANFD_CFG_SJW(sjw) | RCANFD_CFG_TSEG2(tseg2));
+	}
 
-		rcar_canfd_write(priv->base, RCANFD_CCFG(ch), cfg);
-		netdev_dbg(ndev, "nrate: brp %u, sjw %u, tseg1 %u, tseg2 %u\n",
-			   brp, sjw, tseg1, tseg2);
+	rcar_canfd_write(priv->base, RCANFD_CCFG(ch), cfg);
+	netdev_dbg(ndev, "nrate: brp %u, sjw %u, tseg1 %u, tseg2 %u\n", brp,
+		   sjw, tseg1, tseg2);
 
+	if (priv->can.ctrlmode & CAN_CTRLMODE_FD) {
 		/* Data bit timing settings */
 		brp = dbt->brp - 1;
 		sjw = dbt->sjw - 1;
@@ -1471,23 +1475,6 @@ static void rcar_canfd_set_bittiming(struct net_device *ndev)
 		rcar_canfd_write(priv->base, RCANFD_F_DCFG(gpriv, ch), cfg);
 		netdev_dbg(ndev, "drate: brp %u, sjw %u, tseg1 %u, tseg2 %u\n",
 			   brp, sjw, tseg1, tseg2);
-	} else {
-		/* Classical CAN only mode */
-		if (gpriv->info->shared_can_regs) {
-			cfg = (RCANFD_NCFG_NTSEG1(gpriv, tseg1) |
-			       RCANFD_NCFG_NBRP(brp) |
-			       RCANFD_NCFG_NSJW(gpriv, sjw) |
-			       RCANFD_NCFG_NTSEG2(gpriv, tseg2));
-		} else {
-			cfg = (RCANFD_CFG_TSEG1(tseg1) |
-			       RCANFD_CFG_BRP(brp) |
-			       RCANFD_CFG_SJW(sjw) |
-			       RCANFD_CFG_TSEG2(tseg2));
-		}
-
-		rcar_canfd_write(priv->base, RCANFD_CCFG(ch), cfg);
-		netdev_dbg(ndev, "rate: brp %u, sjw %u, tseg1 %u, tseg2 %u\n",
-			   brp, sjw, tseg1, tseg2);
 	}
 }
 
-- 
2.43.0