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of/device: Set bus DMA mask as appropriate

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When an explicit DMA limit is described by firmware, we need to remember
it regardless of how drivers might subsequently update their devices'
masks. The new bus_dma_mask field does that.

Signed-off-by: Robin Murphy <[email protected]>
Acked-by: Ard Biesheuvel <[email protected]>
Signed-off-by: Christoph Hellwig <[email protected]>
This commit is contained in:
Robin Murphy authored and Christoph Hellwig committed 2018-07-27 19:01:05 +02:00
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commit 6c2fb2ea76
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drivers/of/device.c
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@@ -149,6 +149,7 @@ int of_dma_configure(struct device *dev, struct device_node *np, bool force_dma)
* set by the driver.
*/
mask = DMA_BIT_MASK(ilog2(dma_addr + size - 1) + 1);
dev->bus_dma_mask = mask;
dev->coherent_dma_mask &= mask;
*dev->dma_mask &= mask;