diff options
Diffstat (limited to 'drivers/dma')
| -rw-r--r-- | drivers/dma/dma-jz4780.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/dma/dma-jz4780.c b/drivers/dma/dma-jz4780.c index fc513eb2b289..e2ec540e6519 100644 --- a/drivers/dma/dma-jz4780.c +++ b/drivers/dma/dma-jz4780.c @@ -8,6 +8,7 @@ #include <linux/clk.h> #include <linux/dmapool.h> +#include <linux/dma-mapping.h> #include <linux/init.h> #include <linux/interrupt.h> #include <linux/module.h> @@ -911,6 +912,14 @@ static int jz4780_dma_probe(struct platform_device *pdev) dd = &jzdma->dma_device; + /* + * The real segment size limit is dependent on the size unit selected + * for the transfer. Because the size unit is selected automatically + * and may be as small as 1 byte, use a safe limit of 2^24-1 bytes to + * ensure the 24-bit transfer count in the descriptor cannot overflow. + */ + dma_set_max_seg_size(dev, 0xffffff); + dma_cap_set(DMA_MEMCPY, dd->cap_mask); dma_cap_set(DMA_SLAVE, dd->cap_mask); dma_cap_set(DMA_CYCLIC, dd->cap_mask); |