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dmaengine: rcar-dmac: Widen DMA mask to 40 bits
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By default, the DMA mask covers only the low 32-bit address space, which
causes SWIOTLB on arm64 to fall back to a bounce buffer for DMA
transfers involving memory outside the 32-bit address space.

The R-Car DMA controller hardware supports a 40-bit address space, hence
widen the DMA mask to 40 bits to actually make use of this feature.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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Geert Uytterhoeven authored and Vinod Koul committed Feb 14, 2017
1 parent c429ceb commit dc31234
Showing 1 changed file with 1 addition and 0 deletions.
1 change: 1 addition & 0 deletions drivers/dma/sh/rcar-dmac.c
Original file line number Diff line number Diff line change
Expand Up @@ -1716,6 +1716,7 @@ static int rcar_dmac_probe(struct platform_device *pdev)

dmac->dev = &pdev->dev;
platform_set_drvdata(pdev, dmac);
dma_set_mask_and_coherent(dmac->dev, DMA_BIT_MASK(40));

ret = rcar_dmac_parse_of(&pdev->dev, dmac);
if (ret < 0)
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