[PATCH v2 3/9] dmaengine: dw-axi-dmac: Use bus width capability helpers

Advertise the supported bus widths through dma_set_src_bus_widths()
and dma_set_dst_bus_widths() instead of assigning the legacy u32 masks
directly. This keeps the driver using the new bitmap representation
while preserving legacy fields during the transition.

Reviewed-by: Frank Li <[email protected]>
Signed-off-by: Nuno Sá <[email protected]>
---
 drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c | 39 +++++++++++++++-----------
 1 file changed, 23 insertions(+), 16 deletions(-)

diff --git a/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c b/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c
index eebed2474210..0fc4aa537346 100644
--- a/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c
+++ b/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c
@@ -33,20 +33,6 @@
 #include "../dmaengine.h"
 #include "../virt-dma.h"
 
-/*
- * The set of bus widths supported by the DMA controller. DW AXI DMAC supports
- * master data bus width up to 512 bits (for both AXI master interfaces), but
- * it depends on IP block configuration.
- */
-#define AXI_DMA_BUSWIDTHS		  \
-	(DMA_SLAVE_BUSWIDTH_1_BYTE	| \
-	DMA_SLAVE_BUSWIDTH_2_BYTES	| \
-	DMA_SLAVE_BUSWIDTH_4_BYTES	| \
-	DMA_SLAVE_BUSWIDTH_8_BYTES	| \
-	DMA_SLAVE_BUSWIDTH_16_BYTES	| \
-	DMA_SLAVE_BUSWIDTH_32_BYTES	| \
-	DMA_SLAVE_BUSWIDTH_64_BYTES)
-
 #define AXI_DMA_FLAG_HAS_APB_REGS	BIT(0)
 #define AXI_DMA_FLAG_HAS_RESETS		BIT(1)
 #define AXI_DMA_FLAG_USE_CFG2		BIT(2)
@@ -1482,6 +1468,20 @@ static int dw_probe(struct platform_device *pdev)
 	unsigned int flags;
 	u32 i;
 	int ret;
+	/*
+	 * The set of bus widths supported by the DMA controller. DW AXI DMAC
+	 * supports master data bus width up to 512 bits (for both AXI master
+	 * interfaces), but it depends on IP block configuration.
+	 */
+	enum dma_slave_buswidth axi_dma_buswidths[] = {
+		DMA_SLAVE_BUSWIDTH_1_BYTE,
+		DMA_SLAVE_BUSWIDTH_2_BYTES,
+		DMA_SLAVE_BUSWIDTH_4_BYTES,
+		DMA_SLAVE_BUSWIDTH_8_BYTES,
+		DMA_SLAVE_BUSWIDTH_16_BYTES,
+		DMA_SLAVE_BUSWIDTH_32_BYTES,
+		DMA_SLAVE_BUSWIDTH_64_BYTES,
+	};
 
 	chip = devm_kzalloc(&pdev->dev, sizeof(*chip), GFP_KERNEL);
 	if (!chip)
@@ -1565,8 +1565,15 @@ static int dw_probe(struct platform_device *pdev)
 
 	/* DMA capabilities */
 	dw->dma.max_burst = hdata->axi_rw_burst_len;
-	dw->dma.src_addr_widths = AXI_DMA_BUSWIDTHS;
-	dw->dma.dst_addr_widths = AXI_DMA_BUSWIDTHS;
+	ret = dma_set_src_bus_widths(&dw->dma, axi_dma_buswidths,
+				     ARRAY_SIZE(axi_dma_buswidths));
+	if (ret)
+		return ret;
+
+	ret = dma_set_dst_bus_widths(&dw->dma, axi_dma_buswidths,
+				     ARRAY_SIZE(axi_dma_buswidths));
+	if (ret)
+		return ret;
 	dw->dma.directions = BIT(DMA_MEM_TO_MEM);
 	dw->dma.directions |= BIT(DMA_MEM_TO_DEV) | BIT(DMA_DEV_TO_MEM);
 	dw->dma.residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;

-- 
2.55.0