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| author | Russell King | 2013-06-27 13:21:45 +0200 |
|---|---|---|
| committer | Russell King | 2013-10-31 15:48:46 +0100 |
| commit | fa6a8d6d65b19ab44e5244ea499bcd553cc72343 (patch) | |
| tree | 789f1db34489c2eed65718df5c4bbcb102c09b48 /include/linux/dma-mapping.h | |
| parent | DMA-API: usb: ohci-sa1111: add a note about DMA masks (diff) | |
| download | kernel-qcow2-linux-fa6a8d6d65b19ab44e5244ea499bcd553cc72343.tar.gz kernel-qcow2-linux-fa6a8d6d65b19ab44e5244ea499bcd553cc72343.tar.xz kernel-qcow2-linux-fa6a8d6d65b19ab44e5244ea499bcd553cc72343.zip | |
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: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'include/linux/dma-mapping.h')
| -rw-r--r-- | include/linux/dma-mapping.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h index ec951f98e3d9..27d1421ad42c 100644 --- a/include/linux/dma-mapping.h +++ b/include/linux/dma-mapping.h @@ -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) |