[PATCH 2/2] drm/tegra: Set the DMA mask

Alexandre Courbot acourbot at nvidia.com
Tue Feb 23 06:25:54 UTC 2016

The default DMA mask covers a 32 bits address range, but tegradrm can
address more than that. Set the DMA mask to the actual addressable range
to avoid the use of unneeded bounce buffers.

Signed-off-by: Alexandre Courbot <acourbot at nvidia.com>
Thierry, I am not absolutely sure whether the size is correct and applies
to all Tegra generations - please let me know if this needs to be

 drivers/gpu/drm/tegra/drm.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/tegra/drm.c b/drivers/gpu/drm/tegra/drm.c
index bc0555adecaf..503fc9e73521 100644
--- a/drivers/gpu/drm/tegra/drm.c
+++ b/drivers/gpu/drm/tegra/drm.c
@@ -992,6 +992,7 @@ static int host1x_drm_probe(struct host1x_device *dev)
 	dev_set_drvdata(&dev->dev, drm);
 	of_dma_configure(drm->dev, NULL);
+	dma_set_mask(drm->dev, DMA_BIT_MASK(34));
 	err = drm_dev_register(drm, 0);
 	if (err < 0)

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