lkml.org 
[lkml]   [2013]   [Aug]   [1]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Subject[PATCH RFC 27/51] DMA-API: provide a helper to setup DMA masks
    Date
    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>
    ---
    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 8f7a2e8..48ef6f5 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)
    --
    1.7.4.4


    \
     
     \ /
      Last update: 2013-08-02 02:21    [W:4.042 / U:0.032 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site