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dmaengine: dw-axi-dmac: report per-channel max_burst via device_caps #7011

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Merged
merged 1 commit into from
Aug 22, 2025
+11 −1
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dmaengine: dw-axi-dmac: report per-channel max_burst via device_caps #7011

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12 changes: 11 additions & 1 deletion drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1476,6 +1476,16 @@ static int __maybe_unused axi_dma_runtime_resume(struct device *dev)
return axi_dma_resume(chip);
}

static void dw_axi_dma_device_caps(struct dma_chan *dchan,
struct dma_slave_caps *caps)
{
struct axi_dma_chan *chan = dchan_to_axi_dma_chan(dchan);
struct dw_axi_dma *dw = chan->chip->dw;

if (dw->hdata->restrict_axi_burst_len)
caps->max_burst = dw->hdata->axi_rw_burst_len[chan->id];
}

static bool dw_axi_dma_filter_fn(struct dma_chan *dchan, void *filter_param)
{
struct axi_dma_chan *chan = dchan_to_axi_dma_chan(dchan);
Expand Down Expand Up @@ -1720,7 +1730,7 @@ static int dw_probe(struct platform_device *pdev)
dma_cap_set(DMA_CYCLIC, dw->dma.cap_mask);

/* DMA capabilities */
dw->dma.max_burst = hdata->axi_rw_burst_len[0];
dw->dma.device_caps = dw_axi_dma_device_caps;
dw->dma.src_addr_widths = AXI_DMA_BUSWIDTHS;
dw->dma.dst_addr_widths = AXI_DMA_BUSWIDTHS;
dw->dma.directions = BIT(DMA_MEM_TO_MEM);
Expand Down