diff options
Diffstat (limited to 'drivers/mmc/host/jz4740_mmc.c')
| -rw-r--r-- | drivers/mmc/host/jz4740_mmc.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/drivers/mmc/host/jz4740_mmc.c b/drivers/mmc/host/jz4740_mmc.c index f816c06ef916..a316c912a118 100644 --- a/drivers/mmc/host/jz4740_mmc.c +++ b/drivers/mmc/host/jz4740_mmc.c @@ -224,6 +224,26 @@ static int jz4740_mmc_acquire_dma_channels(struct jz4740_mmc_host *host) return PTR_ERR(host->dma_rx); } + /* + * Limit the maximum segment size in any SG entry according to + * the parameters of the DMA engine device. + */ + if (host->dma_tx) { + struct device *dev = host->dma_tx->device->dev; + unsigned int max_seg_size = dma_get_max_seg_size(dev); + + if (max_seg_size < host->mmc->max_seg_size) + host->mmc->max_seg_size = max_seg_size; + } + + if (host->dma_rx) { + struct device *dev = host->dma_rx->device->dev; + unsigned int max_seg_size = dma_get_max_seg_size(dev); + + if (max_seg_size < host->mmc->max_seg_size) + host->mmc->max_seg_size = max_seg_size; + } + return 0; } |