linux-kernel - [PATCH v2 08/10] can: grcan: Add saving and restoring of CAN FD baud-rate registers

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Message-ID: <20251223105604.12675-9-arun.muthusamy@gaisler.com>
Date: Tue, 23 Dec 2025 11:56:02 +0100
From: Arun Muthusamy <arun.muthusamy@...sler.com>
To: robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org,
	mkl@...gutronix.de,
	mailhol@...nel.org
Cc: devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-can@...r.kernel.org,
	Daniel Hellstrom <daniel@...sler.com>,
	Arun Muthusamy <arun.muthusamy@...sler.com>
Subject: [PATCH v2 08/10] can: grcan: Add saving and restoring of CAN FD baud-rate registers

From: Daniel Hellstrom <daniel@...sler.com>

While reset the GRCAN baud-rates are preserved, since GRCANFD has the
baud-rate in different registers we need to add saving of those
registers too.

Signed-off-by: Daniel Hellstrom <daniel@...sler.com>
Signed-off-by: Arun Muthusamy <arun.muthusamy@...sler.com>
---
 drivers/net/can/grcan.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/net/can/grcan.c b/drivers/net/can/grcan.c
index cdb9498cf783..dc14b3145e73 100644
--- a/drivers/net/can/grcan.c
+++ b/drivers/net/can/grcan.c
@@ -520,15 +520,27 @@ static void grcan_reset(struct net_device *dev)
 	struct grcan_priv *priv = netdev_priv(dev);
 	struct grcan_registers __iomem *regs = priv->regs;
 	u32 config = grcan_read_reg(&regs->conf);
+	u32 nbtr, fdbtr;
+
+	if (priv->hwcap->fd) {
+		nbtr = grcan_read_reg(&regs->nbtr);
+		fdbtr = grcan_read_reg(&regs->fdbtr);
+	}
 
 	grcan_set_bits(&regs->ctrl, GRCAN_CTRL_RESET);
 	grcan_write_reg(&regs->conf, config);
+	if (priv->hwcap->fd) {
+		grcan_write_reg(&regs->nbtr, nbtr);
+		grcan_write_reg(&regs->fdbtr, fdbtr);
+	}
 
 	priv->eskbp = grcan_read_reg(&regs->txrd);
 	priv->can.state = CAN_STATE_STOPPED;
 
 	/* Turn off hardware filtering - regs->rxcode set to 0 by reset */
 	grcan_write_reg(&regs->rxmask, 0);
+
+	priv->hwcap->set_bittiming(dev);
 }
 
 /* stop device without changing any configurations */
-- 
2.51.0