netdev - [PATCH net 13/13] can: kvaser_pciefd: Enable 64-bit DMA addressing

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Message-ID: <20240829192947.1186760-14-mkl@pengutronix.de>
Date: Thu, 29 Aug 2024 21:20:46 +0200
From: Marc Kleine-Budde <mkl@...gutronix.de>
To: netdev@...r.kernel.org
Cc: davem@...emloft.net,
	kuba@...nel.org,
	linux-can@...r.kernel.org,
	kernel@...gutronix.de,
	Martin Jocic <martin.jocic@...ser.com>,
	Marc Kleine-Budde <mkl@...gutronix.de>
Subject: [PATCH net 13/13] can: kvaser_pciefd: Enable 64-bit DMA addressing

From: Martin Jocic <martin.jocic@...ser.com>

Enabling 64-bit addressing for DMA buffers will prevent issues
on some memory constrained platforms like e.g. Raspberry Pi 5,
where the driver won't load because it cannot allocate enough
continuous memory in the default 32-bit memory address range.

Signed-off-by: Martin Jocic <martin.jocic@...ser.com>
Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
---
 drivers/net/can/kvaser_pciefd.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/can/kvaser_pciefd.c b/drivers/net/can/kvaser_pciefd.c
index a60d9efd5f8d..99fad592965a 100644
--- a/drivers/net/can/kvaser_pciefd.c
+++ b/drivers/net/can/kvaser_pciefd.c
@@ -1104,6 +1104,10 @@ static int kvaser_pciefd_setup_dma(struct kvaser_pciefd *pcie)
 
 	/* Disable the DMA */
 	iowrite32(0, KVASER_PCIEFD_SRB_ADDR(pcie) + KVASER_PCIEFD_SRB_CTRL_REG);
+
+	if (IS_ENABLED(CONFIG_ARCH_DMA_ADDR_T_64BIT))
+		dma_set_mask_and_coherent(&pcie->pci->dev, DMA_BIT_MASK(64));
+
 	for (i = 0; i < KVASER_PCIEFD_DMA_COUNT; i++) {
 		pcie->dma_data[i] = dmam_alloc_coherent(&pcie->pci->dev,
 							KVASER_PCIEFD_DMA_SIZE,
-- 
2.45.2