The sDMA descriptor autoloading feature uses a fixed size buffer to store descriptors for scatterlist segments. That limits the scatterlist size to the maximum number of descriptors that fit in the buffer. The driver must set this limit for upper layers to obey.
Signed-off-by: Adrian Hunter <adrian.hun...@nokia.com> --- drivers/mmc/host/omap_hsmmc.c | 15 ++++++++++++--- 1 files changed, 12 insertions(+), 3 deletions(-) diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c index 114cd68..bab25ff 100644 --- a/drivers/mmc/host/omap_hsmmc.c +++ b/drivers/mmc/host/omap_hsmmc.c @@ -2239,9 +2239,18 @@ static int __init omap_hsmmc_probe(struct platform_device *pdev) host->dma_caps |= DMA_TYPE_SDMA_DLOAD; } - /* Since we do only SG emulation, we can have as many segs - * as we want. */ - mmc->max_segs = 1024; + if (host->dma_caps & DMA_TYPE_SDMA_DLOAD) { + unsigned int max = DMA_CTRL_BUF_SIZE / + sizeof(struct omap_dma_sglist_node); + + mmc->max_segs = 1 << (fls(max) - 1); + } else { + /* + * Since we do only SG emulation, we can have as many segs as we + * want. + */ + mmc->max_segs = 1024; + } mmc->max_blk_size = 512; /* Block Length at max can be 1024 */ mmc->max_blk_count = 0xFFFF; /* No. of Blocks is 16 bits */ -- 1.7.0.4 -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html