[PATCH 6.12.y] can: rcar_canfd: Fix CAN-FD mode as default

[Sasha Levin <sashal@kernel.org>]

From: Biju Das <biju.das.jz@bp.renesas.com>

[ Upstream commit 6d849ff573722afcf5508d2800017bdd40f27eb9 ]

The commit 5cff263606a1 ("can: rcar_canfd: Fix controller mode setting")
has aligned with the flow mentioned in the hardware manual for all SoCs
except R-Car Gen3 and RZ/G2L SoCs. On R-Car Gen4 and RZ/G3E SoCs, due to
the wrong logic in the commit[1] sets the default mode to FD-Only mode
instead of CAN-FD mode.

This patch sets the CAN-FD mode as the default for all SoCs by dropping
the rcar_canfd_set_mode() as some SoC requires mode setting in global
reset mode, and the rest of the SoCs in channel reset mode and update the
rcar_canfd_reset_controller() to take care of these constraints. Moreover,
the RZ/G3E and R-Car Gen4 SoCs support 3 modes compared to 2 modes on the
R-Car Gen3. Use inverted logic in rcar_canfd_reset_controller() to
simplify the code later to support FD-only mode.

[1]
commit 45721c406dcf ("can: rcar_canfd: Add support for r8a779a0 SoC")

Fixes: 5cff263606a1 ("can: rcar_canfd: Fix controller mode setting")
Cc: stable@vger.kernel.org
Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Link: https://patch.msgid.link/20251118123926.193445-1-biju.das.jz@bp.renesas.com
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
[ adapted to use existing is_gen4() helper and RCANFD_GEN4_FDCFG() macro instead of new ch_interface_mode field and fcbase struct ]
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/net/can/rcar/rcar_canfd.c | 53 +++++++++++++++++--------------
 1 file changed, 30 insertions(+), 23 deletions(-)

diff --git a/drivers/net/can/rcar/rcar_canfd.c b/drivers/net/can/rcar/rcar_canfd.c
index 24dd15c917228..ba662bef155ca 100644
--- a/drivers/net/can/rcar/rcar_canfd.c
+++ b/drivers/net/can/rcar/rcar_canfd.c
@@ -681,26 +681,6 @@ static void rcar_canfd_tx_failure_cleanup(struct net_device *ndev)
 		can_free_echo_skb(ndev, i, NULL);
 }
 
-static void rcar_canfd_set_mode(struct rcar_canfd_global *gpriv)
-{
-	if (is_gen4(gpriv)) {
-		u32 ch, val = gpriv->fdmode ? RCANFD_GEN4_FDCFG_FDOE
-					    : RCANFD_GEN4_FDCFG_CLOE;
-
-		for_each_set_bit(ch, &gpriv->channels_mask,
-				 gpriv->info->max_channels)
-			rcar_canfd_set_bit(gpriv->base, RCANFD_GEN4_FDCFG(ch),
-					   val);
-	} else {
-		if (gpriv->fdmode)
-			rcar_canfd_set_bit(gpriv->base, RCANFD_GRMCFG,
-					   RCANFD_GRMCFG_RCMC);
-		else
-			rcar_canfd_clear_bit(gpriv->base, RCANFD_GRMCFG,
-					     RCANFD_GRMCFG_RCMC);
-	}
-}
-
 static int rcar_canfd_reset_controller(struct rcar_canfd_global *gpriv)
 {
 	u32 sts, ch;
@@ -732,6 +712,16 @@ static int rcar_canfd_reset_controller(struct rcar_canfd_global *gpriv)
 	/* Reset Global error flags */
 	rcar_canfd_write(gpriv->base, RCANFD_GERFL, 0x0);
 
+	/* Set the controller into appropriate mode */
+	if (!is_gen4(gpriv)) {
+		if (gpriv->fdmode)
+			rcar_canfd_set_bit(gpriv->base, RCANFD_GRMCFG,
+					   RCANFD_GRMCFG_RCMC);
+		else
+			rcar_canfd_clear_bit(gpriv->base, RCANFD_GRMCFG,
+					     RCANFD_GRMCFG_RCMC);
+	}
+
 	/* Transition all Channels to reset mode */
 	for_each_set_bit(ch, &gpriv->channels_mask, gpriv->info->max_channels) {
 		rcar_canfd_clear_bit(gpriv->base,
@@ -750,10 +740,27 @@ static int rcar_canfd_reset_controller(struct rcar_canfd_global *gpriv)
 				"channel %u reset failed\n", ch);
 			return err;
 		}
-	}
 
-	/* Set the controller into appropriate mode */
-	rcar_canfd_set_mode(gpriv);
+		/* Set the controller into appropriate mode */
+		if (is_gen4(gpriv)) {
+			/* Do not set CLOE and FDOE simultaneously */
+			if (!gpriv->fdmode) {
+				rcar_canfd_clear_bit(gpriv->base,
+						     RCANFD_GEN4_FDCFG(ch),
+						     RCANFD_GEN4_FDCFG_FDOE);
+				rcar_canfd_set_bit(gpriv->base,
+						   RCANFD_GEN4_FDCFG(ch),
+						   RCANFD_GEN4_FDCFG_CLOE);
+			} else {
+				rcar_canfd_clear_bit(gpriv->base,
+						     RCANFD_GEN4_FDCFG(ch),
+						     RCANFD_GEN4_FDCFG_FDOE);
+				rcar_canfd_clear_bit(gpriv->base,
+						     RCANFD_GEN4_FDCFG(ch),
+						     RCANFD_GEN4_FDCFG_CLOE);
+			}
+		}
+	}
 
 	return 0;
 }
-- 
2.51.0