[PATCH v7 08/15] can: grcan: set DMA mask for GRCAN and GRCANFD to 32-bit

[Arun Muthusamy <arun.muthusamy@gaisler.com>]

From: Daniel Hellstrom <daniel@gaisler.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@gaisler.com>
Signed-off-by: Arun Muthusamy <arun.muthusamy@gaisler.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 c9175a6a013f..6e0a393785e8 100644
--- a/drivers/net/can/grcan.c
+++ b/drivers/net/can/grcan.c
@@ -1746,6 +1746,13 @@ 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