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

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Message-ID: <20251118092115.3455-8-arun.muthusamy@gaisler.com>
Date: Tue, 18 Nov 2025 10:21:12 +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 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: Arun Muthusamy <arun.muthusamy@...sler.com>
Signed-off-by: Daniel Hellstrom <daniel@...sler.com>
---
 drivers/net/can/grcan.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/net/can/grcan.c b/drivers/net/can/grcan.c
index e367581faa57..51a10fae2faf 100644
--- a/drivers/net/can/grcan.c
+++ b/drivers/net/can/grcan.c
@@ -1074,6 +1074,12 @@ static int grcan_allocate_dma_buffers(struct net_device *dev,

 	/* Extra GRCAN_BUFFER_ALIGNMENT to allow for alignment */
 	dma->base_size = lsize + ssize + GRCAN_BUFFER_ALIGNMENT;
+
+	/* On 64-bit systems.. GRCAN and GRCANFD can only address 32-bit */
+	if (dma_set_mask_and_coherent(priv->ofdev_dev, DMA_BIT_MASK(32))) {
+		netdev_warn(dev, "No suitable DMA available\n");
+		return -ENOMEM;
+	}
 	dma->base_buf = dma_alloc_coherent(priv->ofdev_dev,
 					   dma->base_size,
 					   &dma->base_handle,
--
2.51.0