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Commit fa6a8d6d authored by Russell King's avatar Russell King
Browse files

DMA-API: provide a helper to setup DMA masks 



Many drivers contain code such as:

	dev->dma_mask = &dev->coherent_dma_mask;
	dev->coherent_dma_mask = MASK;

Let's move this pattern out of drivers and have the DMA API provide a
helper for it.  This helper uses dma_set_mask_and_coherent() to allow
platform issues to be properly dealt with via dma_set_mask()/
dma_is_supported().

Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent 4ffb4318

include/linux/dma-mapping.h

+10 −0
Original line number Diff line number Diff line
@@ -111,6 +111,16 @@ static inline int dma_set_mask_and_coherent(struct device *dev, u64 mask) 
	return rc;

}



/*

 * Similar to the above, except it deals with the case where the device

 * does not have dev->dma_mask appropriately setup.

 */

static inline int dma_coerce_mask_and_coherent(struct device *dev, u64 mask)

{

	dev->dma_mask = &dev->coherent_dma_mask;

	return dma_set_mask_and_coherent(dev, mask);

}



extern u64 dma_get_required_mask(struct device *dev);



static inline unsigned int dma_get_max_seg_size(struct device *dev)