linux-kernel - [PATCH v2 07/10] can: grcan: set DMA mask for GRCAN and GRCANFD to 32-bit

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Message-ID: <20251223105604.12675-8-arun.muthusamy@gaisler.com>
Date: Tue, 23 Dec 2025 11:56:01 +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 07/10] can: grcan: set DMA mask for GRCAN and GRCANFD to 32-bit

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

Sets the DMA mask for GRCAN and GRCANFD devices to 32-bit.
Setting the DMA mask and coherent DMA mask to 32-bit ensures proper
memory addressing during DMA operations

Signed-off-by: Daniel Hellstrom <daniel@...sler.com>
Signed-off-by: Arun Muthusamy <arun.muthusamy@...sler.com>
---
 drivers/net/can/grcan.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/net/can/grcan.c b/drivers/net/can/grcan.c
index 8a6c59473cf4..cdb9498cf783 100644
--- a/drivers/net/can/grcan.c
+++ b/drivers/net/can/grcan.c
@@ -1753,6 +1753,13 @@ static int grcan_probe(struct platform_device *ofdev)
 		goto exit_error;
 	}
 
+	/* On 64-bit systems.. GRCAN and GRCANFD can only address 32-bit */
+	err = dma_set_mask_and_coherent(&ofdev->dev, DMA_BIT_MASK(32));
+	if (err) {
+		dev_err_probe(&ofdev->dev, err, "No usable DMA configuration.\n");
+		goto exit_error;
+	}
+
 	irq = irq_of_parse_and_map(np, GRCAN_IRQIX_IRQ);
 	if (!irq) {
 		dev_err(&ofdev->dev, "no irq found\n");
-- 
2.51.0