diff options
| author | Geert Uytterhoeven <geert+renesas@glider.be> | 2017-02-13 12:00:26 +0100 |
|---|---|---|
| committer | Vinod Koul <vinod.koul@intel.com> | 2017-02-14 13:23:02 +0530 |
| commit | dc312349e87526dfe6387c1a82fafded706f0572 (patch) | |
| tree | 47bdb8a763db24ffa0007782098e7591c745db1e /drivers/dma | |
| parent | c429ceb1e18252122ba96b52e689dcf87103c186 (diff) | |
| download | lwn-dc312349e87526dfe6387c1a82fafded706f0572.tar.gz lwn-dc312349e87526dfe6387c1a82fafded706f0572.zip | |
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: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Diffstat (limited to 'drivers/dma')
| -rw-r--r-- | drivers/dma/sh/rcar-dmac.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/dma/sh/rcar-dmac.c b/drivers/dma/sh/rcar-dmac.c index 2e441d0ccd79..93a69b992a51 100644 --- a/drivers/dma/sh/rcar-dmac.c +++ b/drivers/dma/sh/rcar-dmac.c @@ -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) |