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Commit dc312349 authored by Geert Uytterhoeven's avatar Geert Uytterhoeven Committed by Vinod Koul
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dmaengine: rcar-dmac: Widen DMA mask to 40 bits 



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: default avatarGeert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: default avatarVinod Koul <vinod.koul@intel.com>
parent c429ceb1

drivers/dma/sh/rcar-dmac.c

+1 −0
Original line number Diff line number Diff line
@@ -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)